src/pulsecore/core-util.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2004 Joe Marcus Clarke
   6   Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as
  10   published by the Free Software Foundation; either version 2.1 of the
  11   License, or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public
  19   License along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdarg.h>
  29 #include <stdlib.h>
  30 #include <signal.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <stdio.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <limits.h>
  37 #include <time.h>
  38 #include <ctype.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <sys/time.h>
  42 #include <dirent.h>
  43 #include <regex.h>
  44
  45 #ifdef HAVE_LANGINFO_H
  46 #include <langinfo.h>
  47 #endif
  48
  49 #ifdef HAVE_UNAME
  50 #include <sys/utsname.h>
  51 #endif
  52
  53 #ifdef HAVE_STRTOF_L
  54 #include <locale.h>
  55 #endif
  56
  57 #ifdef HAVE_SCHED_H
  58 #include <sched.h>
  59
  60 #if defined(__linux__) && !defined(SCHED_RESET_ON_FORK)
  61 #define SCHED_RESET_ON_FORK 0x40000000
  62 #endif
  63 #endif
  64
  65 #ifdef HAVE_SYS_RESOURCE_H
  66 #include <sys/resource.h>
  67 #endif
  68
  69 #ifdef HAVE_SYS_CAPABILITY_H
  70 #include <sys/capability.h>
  71 #endif
  72
  73 #ifdef HAVE_SYS_MMAN_H
  74 #include <sys/mman.h>
  75 #endif
  76
  77 #ifdef HAVE_PTHREAD
  78 #include <pthread.h>
  79 #endif
  80
  81 #ifdef HAVE_NETDB_H
  82 #include <netdb.h>
  83 #endif
  84
  85 #ifdef HAVE_WINDOWS_H
  86 #include <windows.h>
  87 #endif
  88
  89 #ifdef HAVE_PWD_H
  90 #include <pwd.h>
  91 #endif
  92
  93 #ifdef HAVE_GRP_H
  94 #include <grp.h>
  95 #endif
  96
  97 #ifdef HAVE_LIBSAMPLERATE
  98 #include <samplerate.h>
  99 #endif
 100
 101 #ifdef __APPLE__
 102 #include <xlocale.h>
 103 #endif
 104
 105 #ifdef HAVE_DBUS
 106 #include "rtkit.h"
 107 #endif
 108
 109 #ifdef __linux__
 110 #include <sys/personality.h>
 111 #endif
 112
 113 #include <pulse/xmalloc.h>
 114 #include <pulse/util.h>
 115 #include <pulse/utf8.h>
 116
 117 #include <pulsecore/core-error.h>
 118 #include <pulsecore/socket.h>
 119 #include <pulsecore/log.h>
 120 #include <pulsecore/macro.h>
 121 #include <pulsecore/thread.h>
 122 #include <pulsecore/strbuf.h>
 123 #include <pulsecore/usergroup.h>
 124 #include <pulsecore/strlist.h>
 125 #include <pulsecore/cpu-x86.h>
 126
 127 #include "core-util.h"
 128
 129 /* Not all platforms have this */
 130 #ifndef MSG_NOSIGNAL
 131 #define MSG_NOSIGNAL 0
 132 #endif
 133
 134 #define NEWLINE "\r\n"
 135 #define WHITESPACE "\n\r \t"
 136
 137 static pa_strlist *recorded_env = NULL;
 138
 139 #ifdef OS_IS_WIN32
 140
 141 #define PULSE_ROOTENV "PULSE_ROOT"
 142
 143 int pa_set_root(HANDLE handle) {
 144     char library_path[MAX_PATH + sizeof(PULSE_ROOTENV) + 1], *sep;
 145
 146     strcpy(library_path, PULSE_ROOTENV "=");
 147
 148     /* FIXME: Needs to set errno */
 149
 150     if (!GetModuleFileName(handle, library_path + sizeof(PULSE_ROOTENV), MAX_PATH))
 151         return 0;
 152
 153     sep = strrchr(library_path, PA_PATH_SEP_CHAR);
 154     if (sep)
 155         *sep = '\0';
 156
 157     if (_putenv(library_path) < 0)
 158         return 0;
 159
 160     return 1;
 161 }
 162
 163 #endif
 164
 165 /** Make a file descriptor nonblock. Doesn't do any error checking */
 166 void pa_make_fd_nonblock(int fd) {
 167
 168 #ifdef O_NONBLOCK
 169     int v;
 170     pa_assert(fd >= 0);
 171
 172     pa_assert_se((v = fcntl(fd, F_GETFL)) >= 0);
 173
 174     if (!(v & O_NONBLOCK))
 175         pa_assert_se(fcntl(fd, F_SETFL, v|O_NONBLOCK) >= 0);
 176
 177 #elif defined(OS_IS_WIN32)
 178     u_long arg = 1;
 179     if (ioctlsocket(fd, FIONBIO, &arg) < 0) {
 180         pa_assert_se(WSAGetLastError() == WSAENOTSOCK);
 181         pa_log_warn("Only sockets can be made non-blocking!");
 182     }
 183 #else
 184     pa_log_warn("Non-blocking I/O not supported.!");
 185 #endif
 186
 187 }
 188
 189 /* Set the FD_CLOEXEC flag for a fd */
 190 void pa_make_fd_cloexec(int fd) {
 191
 192 #ifdef FD_CLOEXEC
 193     int v;
 194     pa_assert(fd >= 0);
 195
 196     pa_assert_se((v = fcntl(fd, F_GETFD, 0)) >= 0);
 197
 198     if (!(v & FD_CLOEXEC))
 199         pa_assert_se(fcntl(fd, F_SETFD, v|FD_CLOEXEC) >= 0);
 200 #endif
 201
 202 }
 203
 204 /** Creates a directory securely */
 205 int pa_make_secure_dir(const char* dir, mode_t m, uid_t uid, gid_t gid) {
 206     struct stat st;
 207     int r, saved_errno, fd;
 208
 209     pa_assert(dir);
 210
 211 #ifdef OS_IS_WIN32
 212     r = mkdir(dir);
 213 #else
 214     {
 215     mode_t u;
 216     u = umask((~m) & 0777);
 217     r = mkdir(dir, m);
 218     umask(u);
 219     }
 220 #endif
 221
 222     if (r < 0 && errno != EEXIST)
 223         return -1;
 224
 225 #if defined(HAVE_FSTAT) && !defined(OS_IS_WIN32)
 226     if ((fd = open(dir,
 227 #ifdef O_CLOEXEC
 228                    O_CLOEXEC|
 229 #endif
 230 #ifdef O_NOCTTY
 231                    O_NOCTTY|
 232 #endif
 233 #ifdef O_NOFOLLOW
 234                    O_NOFOLLOW|
 235 #endif
 236                    O_RDONLY)) < 0)
 237         goto fail;
 238
 239     if (fstat(fd, &st) < 0) {
 240         pa_assert_se(pa_close(fd) >= 0);
 241         goto fail;
 242     }
 243
 244     if (!S_ISDIR(st.st_mode)) {
 245         pa_assert_se(pa_close(fd) >= 0);
 246         errno = EEXIST;
 247         goto fail;
 248     }
 249
 250 #ifdef HAVE_FCHOWN
 251     if (uid == (uid_t)-1)
 252         uid = getuid();
 253     if (gid == (gid_t)-1)
 254         gid = getgid();
 255     (void) fchown(fd, uid, gid);
 256 #endif
 257
 258 #ifdef HAVE_FCHMOD
 259     (void) fchmod(fd, m);
 260 #endif
 261
 262     pa_assert_se(pa_close(fd) >= 0);
 263 #endif
 264
 265 #ifdef HAVE_LSTAT
 266     if (lstat(dir, &st) < 0)
 267 #else
 268     if (stat(dir, &st) < 0)
 269 #endif
 270         goto fail;
 271
 272 #ifndef OS_IS_WIN32
 273     if (!S_ISDIR(st.st_mode) ||
 274         (st.st_uid != uid) ||
 275         (st.st_gid != gid) ||
 276         ((st.st_mode & 0777) != m)) {
 277         errno = EACCES;
 278         goto fail;
 279     }
 280 #else
 281     pa_log_warn("Secure directory creation not supported on Win32.");
 282 #endif
 283
 284     return 0;
 285
 286 fail:
 287     saved_errno = errno;
 288     rmdir(dir);
 289     errno = saved_errno;
 290
 291     return -1;
 292 }
 293
 294 /* Return a newly allocated sting containing the parent directory of the specified file */
 295 char *pa_parent_dir(const char *fn) {
 296     char *slash, *dir = pa_xstrdup(fn);
 297
 298     if ((slash = (char*) pa_path_get_filename(dir)) == dir) {
 299         pa_xfree(dir);
 300         errno = ENOENT;
 301         return NULL;
 302     }
 303
 304     *(slash-1) = 0;
 305     return dir;
 306 }
 307
 308 /* Creates a the parent directory of the specified path securely */
 309 int pa_make_secure_parent_dir(const char *fn, mode_t m, uid_t uid, gid_t gid) {
 310     int ret = -1;
 311     char *dir;
 312
 313     if (!(dir = pa_parent_dir(fn)))
 314         goto finish;
 315
 316     if (pa_make_secure_dir(dir, m, uid, gid) < 0)
 317         goto finish;
 318
 319     ret = 0;
 320
 321 finish:
 322     pa_xfree(dir);
 323     return ret;
 324 }
 325
 326 /** Platform independent read function. Necessary since not all
 327  * systems treat all file descriptors equal. If type is
 328  * non-NULL it is used to cache the type of the fd. This is
 329  * useful for making sure that only a single syscall is executed per
 330  * function call. The variable pointed to should be initialized to 0
 331  * by the caller. */
 332 ssize_t pa_read(int fd, void *buf, size_t count, int *type) {
 333
 334 #ifdef OS_IS_WIN32
 335
 336     if (!type || *type == 0) {
 337         ssize_t r;
 338
 339         if ((r = recv(fd, buf, count, 0)) >= 0)
 340             return r;
 341
 342         if (WSAGetLastError() != WSAENOTSOCK) {
 343             errno = WSAGetLastError();
 344             return r;
 345         }
 346
 347         if (type)
 348             *type = 1;
 349     }
 350
 351 #endif
 352
 353     for (;;) {
 354         ssize_t r;
 355
 356         if ((r = read(fd, buf, count)) < 0)
 357             if (errno == EINTR)
 358                 continue;
 359
 360         return r;
 361     }
 362 }
 363
 364 /** Similar to pa_read(), but handles writes */
 365 ssize_t pa_write(int fd, const void *buf, size_t count, int *type) {
 366
 367     if (!type || *type == 0) {
 368         ssize_t r;
 369
 370         for (;;) {
 371             if ((r = send(fd, buf, count, MSG_NOSIGNAL)) < 0) {
 372
 373                 if (errno == EINTR)
 374                     continue;
 375
 376                 break;
 377             }
 378
 379             return r;
 380         }
 381
 382 #ifdef OS_IS_WIN32
 383         if (WSAGetLastError() != WSAENOTSOCK) {
 384             errno = WSAGetLastError();
 385             return r;
 386         }
 387 #else
 388         if (errno != ENOTSOCK)
 389             return r;
 390 #endif
 391
 392         if (type)
 393             *type = 1;
 394     }
 395
 396     for (;;) {
 397         ssize_t r;
 398
 399         if ((r = write(fd, buf, count)) < 0)
 400             if (errno == EINTR)
 401                 continue;
 402
 403         return r;
 404     }
 405 }
 406
 407 /** Calls read() in a loop. Makes sure that as much as 'size' bytes,
 408  * unless EOF is reached or an error occurred */
 409 ssize_t pa_loop_read(int fd, void*data, size_t size, int *type) {
 410     ssize_t ret = 0;
 411     int _type;
 412
 413     pa_assert(fd >= 0);
 414     pa_assert(data);
 415     pa_assert(size);
 416
 417     if (!type) {
 418         _type = 0;
 419         type = &_type;
 420     }
 421
 422     while (size > 0) {
 423         ssize_t r;
 424
 425         if ((r = pa_read(fd, data, size, type)) < 0)
 426             return r;
 427
 428         if (r == 0)
 429             break;
 430
 431         ret += r;
 432         data = (uint8_t*) data + r;
 433         size -= (size_t) r;
 434     }
 435
 436     return ret;
 437 }
 438
 439 /** Similar to pa_loop_read(), but wraps write() */
 440 ssize_t pa_loop_write(int fd, const void*data, size_t size, int *type) {
 441     ssize_t ret = 0;
 442     int _type;
 443
 444     pa_assert(fd >= 0);
 445     pa_assert(data);
 446     pa_assert(size);
 447
 448     if (!type) {
 449         _type = 0;
 450         type = &_type;
 451     }
 452
 453     while (size > 0) {
 454         ssize_t r;
 455
 456         if ((r = pa_write(fd, data, size, type)) < 0)
 457             return r;
 458
 459         if (r == 0)
 460             break;
 461
 462         ret += r;
 463         data = (const uint8_t*) data + r;
 464         size -= (size_t) r;
 465     }
 466
 467     return ret;
 468 }
 469
 470 /** Platform independent read function. Necessary since not all
 471  * systems treat all file descriptors equal. */
 472 int pa_close(int fd) {
 473
 474 #ifdef OS_IS_WIN32
 475     int ret;
 476
 477     if ((ret = closesocket(fd)) == 0)
 478         return 0;
 479
 480     if (WSAGetLastError() != WSAENOTSOCK) {
 481         errno = WSAGetLastError();
 482         return ret;
 483     }
 484 #endif
 485
 486     for (;;) {
 487         int r;
 488
 489         if ((r = close(fd)) < 0)
 490             if (errno == EINTR)
 491                 continue;
 492
 493         return r;
 494     }
 495 }
 496
 497 /* Print a warning messages in case that the given signal is not
 498  * blocked or trapped */
 499 void pa_check_signal_is_blocked(int sig) {
 500 #ifdef HAVE_SIGACTION
 501     struct sigaction sa;
 502     sigset_t set;
 503
 504     /* If POSIX threads are supported use thread-aware
 505      * pthread_sigmask() function, to check if the signal is
 506      * blocked. Otherwise fall back to sigprocmask() */
 507
 508 #ifdef HAVE_PTHREAD
 509     if (pthread_sigmask(SIG_SETMASK, NULL, &set) < 0) {
 510 #endif
 511         if (sigprocmask(SIG_SETMASK, NULL, &set) < 0) {
 512             pa_log("sigprocmask(): %s", pa_cstrerror(errno));
 513             return;
 514         }
 515 #ifdef HAVE_PTHREAD
 516     }
 517 #endif
 518
 519     if (sigismember(&set, sig))
 520         return;
 521
 522     /* Check whether the signal is trapped */
 523
 524     if (sigaction(sig, NULL, &sa) < 0) {
 525         pa_log("sigaction(): %s", pa_cstrerror(errno));
 526         return;
 527     }
 528
 529     if (sa.sa_handler != SIG_DFL)
 530         return;
 531
 532     pa_log_warn("%s is not trapped. This might cause malfunction!", pa_sig2str(sig));
 533 #else /* HAVE_SIGACTION */
 534     pa_log_warn("%s might not be trapped. This might cause malfunction!", pa_sig2str(sig));
 535 #endif
 536 }
 537
 538 /* The following function is based on an example from the GNU libc
 539  * documentation. This function is similar to GNU's asprintf(). */
 540 char *pa_sprintf_malloc(const char *format, ...) {
 541     size_t  size = 100;
 542     char *c = NULL;
 543
 544     pa_assert(format);
 545
 546     for(;;) {
 547         int r;
 548         va_list ap;
 549
 550         c = pa_xrealloc(c, size);
 551
 552         va_start(ap, format);
 553         r = vsnprintf(c, size, format, ap);
 554         va_end(ap);
 555
 556         c[size-1] = 0;
 557
 558         if (r > -1 && (size_t) r < size)
 559             return c;
 560
 561         if (r > -1)    /* glibc 2.1 */
 562             size = (size_t) r+1;
 563         else           /* glibc 2.0 */
 564             size *= 2;
 565     }
 566 }
 567
 568 /* Same as the previous function, but use a va_list instead of an
 569  * ellipsis */
 570 char *pa_vsprintf_malloc(const char *format, va_list ap) {
 571     size_t  size = 100;
 572     char *c = NULL;
 573
 574     pa_assert(format);
 575
 576     for(;;) {
 577         int r;
 578         va_list aq;
 579
 580         c = pa_xrealloc(c, size);
 581
 582         va_copy(aq, ap);
 583         r = vsnprintf(c, size, format, aq);
 584         va_end(aq);
 585
 586         c[size-1] = 0;
 587
 588         if (r > -1 && (size_t) r < size)
 589             return c;
 590
 591         if (r > -1)    /* glibc 2.1 */
 592             size = (size_t) r+1;
 593         else           /* glibc 2.0 */
 594             size *= 2;
 595     }
 596 }
 597
 598 /* Similar to OpenBSD's strlcpy() function */
 599 char *pa_strlcpy(char *b, const char *s, size_t l) {
 600     size_t k;
 601
 602     pa_assert(b);
 603     pa_assert(s);
 604     pa_assert(l > 0);
 605
 606     k = strlen(s);
 607
 608     if (k > l-1)
 609         k = l-1;
 610
 611     memcpy(b, s, k);
 612     b[k] = 0;
 613
 614     return b;
 615 }
 616
 617 static int set_scheduler(int rtprio) {
 618 #ifdef HAVE_SCHED_H
 619     struct sched_param sp;
 620 #ifdef HAVE_DBUS
 621     int r;
 622     DBusError error;
 623     DBusConnection *bus;
 624
 625     dbus_error_init(&error);
 626 #endif
 627
 628     pa_zero(sp);
 629     sp.sched_priority = rtprio;
 630
 631 #ifdef SCHED_RESET_ON_FORK
 632     if (pthread_setschedparam(pthread_self(), SCHED_RR|SCHED_RESET_ON_FORK, &sp) == 0) {
 633         pa_log_debug("SCHED_RR|SCHED_RESET_ON_FORK worked.");
 634         return 0;
 635     }
 636 #endif
 637
 638     if (pthread_setschedparam(pthread_self(), SCHED_RR, &sp) == 0) {
 639         pa_log_debug("SCHED_RR worked.");
 640         return 0;
 641     }
 642 #endif  /* HAVE_SCHED_H */
 643
 644 #ifdef HAVE_DBUS
 645     /* Try to talk to RealtimeKit */
 646
 647     if (!(bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
 648         pa_log("Failed to connect to system bus: %s\n", error.message);
 649         dbus_error_free(&error);
 650         errno = -EIO;
 651         return -1;
 652     }
 653
 654     /* We need to disable exit on disconnect because otherwise
 655      * dbus_shutdown will kill us. See
 656      * https://bugs.freedesktop.org/show_bug.cgi?id=16924 */
 657     dbus_connection_set_exit_on_disconnect(bus, FALSE);
 658
 659     r = rtkit_make_realtime(bus, 0, rtprio);
 660     dbus_connection_unref(bus);
 661
 662     if (r >= 0) {
 663         pa_log_debug("RealtimeKit worked.");
 664         return 0;
 665     }
 666
 667     errno = -r;
 668 #else
 669     errno = 0;
 670 #endif
 671
 672     return -1;
 673 }
 674
 675 /* Make the current thread a realtime thread, and acquire the highest
 676  * rtprio we can get that is less or equal the specified parameter. If
 677  * the thread is already realtime, don't do anything. */
 678 int pa_make_realtime(int rtprio) {
 679
 680 #ifdef _POSIX_PRIORITY_SCHEDULING
 681     int p;
 682
 683     if (set_scheduler(rtprio) >= 0) {
 684         pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i.", rtprio);
 685         return 0;
 686     }
 687
 688     for (p = rtprio-1; p >= 1; p--)
 689         if (set_scheduler(p) >= 0) {
 690             pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i, which is lower than the requested %i.", p, rtprio);
 691             return 0;
 692         }
 693
 694     pa_log_info("Failed to acquire real-time scheduling: %s", pa_cstrerror(errno));
 695     return -1;
 696 #else
 697
 698     errno = ENOTSUP;
 699     return -1;
 700 #endif
 701 }
 702
 703 static int set_nice(int nice_level) {
 704 #ifdef HAVE_DBUS
 705     DBusError error;
 706     DBusConnection *bus;
 707     int r;
 708
 709     dbus_error_init(&error);
 710 #endif
 711
 712 #ifdef HAVE_SYS_RESOURCE_H
 713     if (setpriority(PRIO_PROCESS, 0, nice_level) >= 0) {
 714         pa_log_debug("setpriority() worked.");
 715         return 0;
 716     }
 717 #endif
 718
 719 #ifdef HAVE_DBUS
 720     /* Try to talk to RealtimeKit */
 721
 722     if (!(bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
 723         pa_log("Failed to connect to system bus: %s\n", error.message);
 724         dbus_error_free(&error);
 725         errno = -EIO;
 726         return -1;
 727     }
 728
 729     /* We need to disable exit on disconnect because otherwise
 730      * dbus_shutdown will kill us. See
 731      * https://bugs.freedesktop.org/show_bug.cgi?id=16924 */
 732     dbus_connection_set_exit_on_disconnect(bus, FALSE);
 733
 734     r = rtkit_make_high_priority(bus, 0, nice_level);
 735     dbus_connection_unref(bus);
 736
 737     if (r >= 0) {
 738         pa_log_debug("RealtimeKit worked.");
 739         return 0;
 740     }
 741
 742     errno = -r;
 743 #endif
 744
 745     return -1;
 746 }
 747
 748 /* Raise the priority of the current process as much as possible that
 749  * is <= the specified nice level..*/
 750 int pa_raise_priority(int nice_level) {
 751
 752 #ifdef HAVE_SYS_RESOURCE_H
 753     int n;
 754
 755     if (set_nice(nice_level) >= 0) {
 756         pa_log_info("Successfully gained nice level %i.", nice_level);
 757         return 0;
 758     }
 759
 760     for (n = nice_level+1; n < 0; n++)
 761         if (set_nice(n) >= 0) {
 762             pa_log_info("Successfully acquired nice level %i, which is lower than the requested %i.", n, nice_level);
 763             return 0;
 764         }
 765
 766     pa_log_info("Failed to acquire high-priority scheduling: %s", pa_cstrerror(errno));
 767     return -1;
 768 #endif
 769
 770 #ifdef OS_IS_WIN32
 771     if (nice_level < 0) {
 772         if (!SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS)) {
 773             pa_log_warn("SetPriorityClass() failed: 0x%08X", GetLastError());
 774             errno = EPERM;
 775             return -1;
 776         }
 777
 778         pa_log_info("Successfully gained high priority class.");
 779     }
 780 #endif
 781
 782     return 0;
 783 }
 784
 785 /* Reset the priority to normal, inverting the changes made by
 786  * pa_raise_priority() and pa_make_realtime()*/
 787 void pa_reset_priority(void) {
 788 #ifdef HAVE_SYS_RESOURCE_H
 789     struct sched_param sp;
 790
 791     setpriority(PRIO_PROCESS, 0, 0);
 792
 793     pa_zero(sp);
 794     pthread_setschedparam(pthread_self(), SCHED_OTHER, &sp);
 795 #endif
 796
 797 #ifdef OS_IS_WIN32
 798     SetPriorityClass(GetCurrentProcess(), NORMAL_PRIORITY_CLASS);
 799 #endif
 800 }
 801
 802 int pa_match(const char *expr, const char *v) {
 803     int k;
 804     regex_t re;
 805     int r;
 806
 807     if (regcomp(&re, expr, REG_NOSUB|REG_EXTENDED) != 0) {
 808         errno = EINVAL;
 809         return -1;
 810     }
 811
 812     if ((k = regexec(&re, v, 0, NULL, 0)) == 0)
 813         r = 1;
 814     else if (k == REG_NOMATCH)
 815         r = 0;
 816     else
 817         r = -1;
 818
 819     regfree(&re);
 820
 821     if (r < 0)
 822         errno = EINVAL;
 823
 824     return r;
 825 }
 826
 827 /* Try to parse a boolean string value.*/
 828 int pa_parse_boolean(const char *v) {
 829     const char *expr;
 830     pa_assert(v);
 831
 832     /* First we check language independant */
 833     if (!strcmp(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
 834         return 1;
 835     else if (!strcmp(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
 836         return 0;
 837
 838 #ifdef HAVE_LANGINFO_H
 839     /* And then we check language dependant */
 840     if ((expr = nl_langinfo(YESEXPR)))
 841         if (expr[0])
 842             if (pa_match(expr, v) > 0)
 843                 return 1;
 844
 845     if ((expr = nl_langinfo(NOEXPR)))
 846         if (expr[0])
 847             if (pa_match(expr, v) > 0)
 848                 return 0;
 849 #endif
 850
 851     errno = EINVAL;
 852     return -1;
 853 }
 854
 855 /* Split the specified string wherever one of the strings in delimiter
 856  * occurs. Each time it is called returns a newly allocated string
 857  * with pa_xmalloc(). The variable state points to, should be
 858  * initiallized to NULL before the first call. */
 859 char *pa_split(const char *c, const char *delimiter, const char**state) {
 860     const char *current = *state ? *state : c;
 861     size_t l;
 862
 863     if (!*current)
 864         return NULL;
 865
 866     l = strcspn(current, delimiter);
 867     *state = current+l;
 868
 869     if (**state)
 870         (*state)++;
 871
 872     return pa_xstrndup(current, l);
 873 }
 874
 875 /* Split a string into words. Otherwise similar to pa_split(). */
 876 char *pa_split_spaces(const char *c, const char **state) {
 877     const char *current = *state ? *state : c;
 878     size_t l;
 879
 880     if (!*current || *c == 0)
 881         return NULL;
 882
 883     current += strspn(current, WHITESPACE);
 884     l = strcspn(current, WHITESPACE);
 885
 886     *state = current+l;
 887
 888     return pa_xstrndup(current, l);
 889 }
 890
 891 PA_STATIC_TLS_DECLARE(signame, pa_xfree);
 892
 893 /* Return the name of an UNIX signal. Similar to Solaris sig2str() */
 894 const char *pa_sig2str(int sig) {
 895     char *t;
 896
 897     if (sig <= 0)
 898         goto fail;
 899
 900 #ifdef NSIG
 901     if (sig >= NSIG)
 902         goto fail;
 903 #endif
 904
 905 #ifdef HAVE_SIG2STR
 906     {
 907         char buf[SIG2STR_MAX];
 908
 909         if (sig2str(sig, buf) == 0) {
 910             pa_xfree(PA_STATIC_TLS_GET(signame));
 911             t = pa_sprintf_malloc("SIG%s", buf);
 912             PA_STATIC_TLS_SET(signame, t);
 913             return t;
 914         }
 915     }
 916 #else
 917
 918     switch(sig) {
 919 #ifdef SIGHUP
 920         case SIGHUP:    return "SIGHUP";
 921 #endif
 922         case SIGINT:    return "SIGINT";
 923 #ifdef SIGQUIT
 924         case SIGQUIT:   return "SIGQUIT";
 925 #endif
 926         case SIGILL:    return "SIGULL";
 927 #ifdef SIGTRAP
 928         case SIGTRAP:   return "SIGTRAP";
 929 #endif
 930         case SIGABRT:   return "SIGABRT";
 931 #ifdef SIGBUS
 932         case SIGBUS:    return "SIGBUS";
 933 #endif
 934         case SIGFPE:    return "SIGFPE";
 935 #ifdef SIGKILL
 936         case SIGKILL:   return "SIGKILL";
 937 #endif
 938 #ifdef SIGUSR1
 939         case SIGUSR1:   return "SIGUSR1";
 940 #endif
 941         case SIGSEGV:   return "SIGSEGV";
 942 #ifdef SIGUSR2
 943         case SIGUSR2:   return "SIGUSR2";
 944 #endif
 945 #ifdef SIGPIPE
 946         case SIGPIPE:   return "SIGPIPE";
 947 #endif
 948 #ifdef SIGALRM
 949         case SIGALRM:   return "SIGALRM";
 950 #endif
 951         case SIGTERM:   return "SIGTERM";
 952 #ifdef SIGSTKFLT
 953         case SIGSTKFLT: return "SIGSTKFLT";
 954 #endif
 955 #ifdef SIGCHLD
 956         case SIGCHLD:   return "SIGCHLD";
 957 #endif
 958 #ifdef SIGCONT
 959         case SIGCONT:   return "SIGCONT";
 960 #endif
 961 #ifdef SIGSTOP
 962         case SIGSTOP:   return "SIGSTOP";
 963 #endif
 964 #ifdef SIGTSTP
 965         case SIGTSTP:   return "SIGTSTP";
 966 #endif
 967 #ifdef SIGTTIN
 968         case SIGTTIN:   return "SIGTTIN";
 969 #endif
 970 #ifdef SIGTTOU
 971         case SIGTTOU:   return "SIGTTOU";
 972 #endif
 973 #ifdef SIGURG
 974         case SIGURG:    return "SIGURG";
 975 #endif
 976 #ifdef SIGXCPU
 977         case SIGXCPU:   return "SIGXCPU";
 978 #endif
 979 #ifdef SIGXFSZ
 980         case SIGXFSZ:   return "SIGXFSZ";
 981 #endif
 982 #ifdef SIGVTALRM
 983         case SIGVTALRM: return "SIGVTALRM";
 984 #endif
 985 #ifdef SIGPROF
 986         case SIGPROF:   return "SIGPROF";
 987 #endif
 988 #ifdef SIGWINCH
 989         case SIGWINCH:  return "SIGWINCH";
 990 #endif
 991 #ifdef SIGIO
 992         case SIGIO:     return "SIGIO";
 993 #endif
 994 #ifdef SIGPWR
 995         case SIGPWR:    return "SIGPWR";
 996 #endif
 997 #ifdef SIGSYS
 998         case SIGSYS:    return "SIGSYS";
 999 #endif
1000     }
1001
1002 #ifdef SIGRTMIN
1003     if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
1004         pa_xfree(PA_STATIC_TLS_GET(signame));
1005         t = pa_sprintf_malloc("SIGRTMIN+%i", sig - SIGRTMIN);
1006         PA_STATIC_TLS_SET(signame, t);
1007         return t;
1008     }
1009 #endif
1010
1011 #endif
1012
1013 fail:
1014
1015     pa_xfree(PA_STATIC_TLS_GET(signame));
1016     t = pa_sprintf_malloc("SIG%i", sig);
1017     PA_STATIC_TLS_SET(signame, t);
1018     return t;
1019 }
1020
1021 #ifdef HAVE_GRP_H
1022
1023 /* Check whether the specified GID and the group name match */
1024 static int is_group(gid_t gid, const char *name) {
1025     struct group *group = NULL;
1026     int r = -1;
1027
1028     errno = 0;
1029     if (!(group = pa_getgrgid_malloc(gid)))
1030     {
1031         if (!errno)
1032             errno = ENOENT;
1033
1034         pa_log("pa_getgrgid_malloc(%u): %s", gid, pa_cstrerror(errno));
1035
1036         goto finish;
1037     }
1038
1039     r = strcmp(name, group->gr_name) == 0;
1040
1041 finish:
1042     pa_getgrgid_free(group);
1043
1044     return r;
1045 }
1046
1047 /* Check the current user is member of the specified group */
1048 int pa_own_uid_in_group(const char *name, gid_t *gid) {
1049     GETGROUPS_T *gids, tgid;
1050     long n = sysconf(_SC_NGROUPS_MAX);
1051     int r = -1, i, k;
1052
1053     pa_assert(n > 0);
1054
1055     gids = pa_xmalloc(sizeof(GETGROUPS_T) * (size_t) n);
1056
1057     if ((n = getgroups((int) n, gids)) < 0) {
1058         pa_log("getgroups(): %s", pa_cstrerror(errno));
1059         goto finish;
1060     }
1061
1062     for (i = 0; i < n; i++) {
1063
1064         if ((k = is_group(gids[i], name)) < 0)
1065             goto finish;
1066         else if (k > 0) {
1067             *gid = gids[i];
1068             r = 1;
1069             goto finish;
1070         }
1071     }
1072
1073     if ((k = is_group(tgid = getgid(), name)) < 0)
1074         goto finish;
1075     else if (k > 0) {
1076         *gid = tgid;
1077         r = 1;
1078         goto finish;
1079     }
1080
1081     r = 0;
1082
1083 finish:
1084
1085     pa_xfree(gids);
1086     return r;
1087 }
1088
1089 /* Check whether the specifc user id is a member of the specified group */
1090 int pa_uid_in_group(uid_t uid, const char *name) {
1091     struct group *group = NULL;
1092     char **i;
1093     int r = -1;
1094
1095     errno = 0;
1096     if (!(group = pa_getgrnam_malloc(name)))
1097     {
1098         if (!errno)
1099             errno = ENOENT;
1100         goto finish;
1101     }
1102
1103     r = 0;
1104     for (i = group->gr_mem; *i; i++) {
1105         struct passwd *pw = NULL;
1106
1107         errno = 0;
1108         if (!(pw = pa_getpwnam_malloc(*i)))
1109             continue;
1110
1111         if (pw->pw_uid == uid)
1112             r = 1;
1113
1114         pa_getpwnam_free(pw);
1115
1116         if (r == 1)
1117             break;
1118     }
1119
1120 finish:
1121     pa_getgrnam_free(group);
1122
1123     return r;
1124 }
1125
1126 /* Get the GID of a gfiven group, return (gid_t) -1 on failure. */
1127 gid_t pa_get_gid_of_group(const char *name) {
1128     gid_t ret = (gid_t) -1;
1129     struct group *gr = NULL;
1130
1131     errno = 0;
1132     if (!(gr = pa_getgrnam_malloc(name)))
1133     {
1134         if (!errno)
1135             errno = ENOENT;
1136         goto finish;
1137     }
1138
1139     ret = gr->gr_gid;
1140
1141 finish:
1142     pa_getgrnam_free(gr);
1143     return ret;
1144 }
1145
1146 int pa_check_in_group(gid_t g) {
1147     gid_t gids[NGROUPS_MAX];
1148     int r;
1149
1150     if ((r = getgroups(NGROUPS_MAX, gids)) < 0)
1151         return -1;
1152
1153     for (; r > 0; r--)
1154         if (gids[r-1] == g)
1155             return 1;
1156
1157     return 0;
1158 }
1159
1160 #else /* HAVE_GRP_H */
1161
1162 int pa_own_uid_in_group(const char *name, gid_t *gid) {
1163     errno = ENOSUP;
1164     return -1;
1165
1166 }
1167
1168 int pa_uid_in_group(uid_t uid, const char *name) {
1169     errno = ENOSUP;
1170     return -1;
1171 }
1172
1173 gid_t pa_get_gid_of_group(const char *name) {
1174     errno = ENOSUP;
1175     return (gid_t) -1;
1176 }
1177
1178 int pa_check_in_group(gid_t g) {
1179     errno = ENOSUP;
1180     return -1;
1181 }
1182
1183 #endif
1184
1185 /* Lock or unlock a file entirely.
1186   (advisory on UNIX, mandatory on Windows) */
1187 int pa_lock_fd(int fd, int b) {
1188 #ifdef F_SETLKW
1189     struct flock f_lock;
1190
1191     /* Try a R/W lock first */
1192
1193     f_lock.l_type = (short) (b ? F_WRLCK : F_UNLCK);
1194     f_lock.l_whence = SEEK_SET;
1195     f_lock.l_start = 0;
1196     f_lock.l_len = 0;
1197
1198     if (fcntl(fd, F_SETLKW, &f_lock) >= 0)
1199         return 0;
1200
1201     /* Perhaps the file descriptor qas opened for read only, than try again with a read lock. */
1202     if (b && errno == EBADF) {
1203         f_lock.l_type = F_RDLCK;
1204         if (fcntl(fd, F_SETLKW, &f_lock) >= 0)
1205             return 0;
1206     }
1207
1208     pa_log("%slock: %s", !b? "un" : "", pa_cstrerror(errno));
1209 #endif
1210
1211 #ifdef OS_IS_WIN32
1212     HANDLE h = (HANDLE)_get_osfhandle(fd);
1213
1214     if (b && LockFile(h, 0, 0, 0xFFFFFFFF, 0xFFFFFFFF))
1215         return 0;
1216     if (!b && UnlockFile(h, 0, 0, 0xFFFFFFFF, 0xFFFFFFFF))
1217         return 0;
1218
1219     pa_log("%slock failed: 0x%08X", !b ? "un" : "", GetLastError());
1220
1221     /* FIXME: Needs to set errno! */
1222 #endif
1223
1224     return -1;
1225 }
1226
1227 /* Remove trailing newlines from a string */
1228 char* pa_strip_nl(char *s) {
1229     pa_assert(s);
1230
1231     s[strcspn(s, NEWLINE)] = 0;
1232     return s;
1233 }
1234
1235 char *pa_strip(char *s) {
1236     char *e, *l = NULL;
1237
1238     /* Drops trailing whitespace. Modifies the string in
1239      * place. Returns pointer to first non-space character */
1240
1241     s += strspn(s, WHITESPACE);
1242
1243     for (e = s; *e; e++)
1244         if (!strchr(WHITESPACE, *e))
1245             l = e;
1246
1247     if (l)
1248         *(l+1) = 0;
1249     else
1250         *s = 0;
1251
1252     return s;
1253 }
1254
1255 /* Create a temporary lock file and lock it. */
1256 int pa_lock_lockfile(const char *fn) {
1257     int fd;
1258     pa_assert(fn);
1259
1260     for (;;) {
1261         struct stat st;
1262
1263         if ((fd = pa_open_cloexec(fn, O_CREAT|O_RDWR
1264 #ifdef O_NOFOLLOW
1265                        |O_NOFOLLOW
1266 #endif
1267                        , S_IRUSR|S_IWUSR)) < 0) {
1268             pa_log_warn("Failed to create lock file '%s': %s", fn, pa_cstrerror(errno));
1269             goto fail;
1270         }
1271
1272         if (pa_lock_fd(fd, 1) < 0) {
1273             pa_log_warn("Failed to lock file '%s'.", fn);
1274             goto fail;
1275         }
1276
1277         if (fstat(fd, &st) < 0) {
1278             pa_log_warn("Failed to fstat() file '%s': %s", fn, pa_cstrerror(errno));
1279             goto fail;
1280         }
1281
1282         /* Check whether the file has been removed meanwhile. When yes,
1283          * restart this loop, otherwise, we're done */
1284         if (st.st_nlink >= 1)
1285             break;
1286
1287         if (pa_lock_fd(fd, 0) < 0) {
1288             pa_log_warn("Failed to unlock file '%s'.", fn);
1289             goto fail;
1290         }
1291
1292         if (pa_close(fd) < 0) {
1293             pa_log_warn("Failed to close file '%s': %s", fn, pa_cstrerror(errno));
1294             fd = -1;
1295             goto fail;
1296         }
1297     }
1298
1299     return fd;
1300
1301 fail:
1302
1303     if (fd >= 0) {
1304         int saved_errno = errno;
1305         pa_close(fd);
1306         errno = saved_errno;
1307     }
1308
1309     return -1;
1310 }
1311
1312 /* Unlock a temporary lcok file */
1313 int pa_unlock_lockfile(const char *fn, int fd) {
1314     int r = 0;
1315     pa_assert(fd >= 0);
1316
1317     if (fn) {
1318         if (unlink(fn) < 0) {
1319             pa_log_warn("Unable to remove lock file '%s': %s", fn, pa_cstrerror(errno));
1320             r = -1;
1321         }
1322     }
1323
1324     if (pa_lock_fd(fd, 0) < 0) {
1325         pa_log_warn("Failed to unlock file '%s'.", fn);
1326         r = -1;
1327     }
1328
1329     if (pa_close(fd) < 0) {
1330         pa_log_warn("Failed to close '%s': %s", fn, pa_cstrerror(errno));
1331         r = -1;
1332     }
1333
1334     return r;
1335 }
1336
1337 static char *get_pulse_home(void) {
1338     char *h;
1339     struct stat st;
1340     char *ret = NULL;
1341
1342     if (!(h = pa_get_home_dir_malloc())) {
1343         pa_log_error("Failed to get home directory.");
1344         return NULL;
1345     }
1346
1347     if (stat(h, &st) < 0) {
1348         pa_log_error("Failed to stat home directory %s: %s", h, pa_cstrerror(errno));
1349         goto finish;
1350     }
1351
1352 #ifdef HAVE_GETUID
1353     if (st.st_uid != getuid()) {
1354         pa_log_error("Home directory %s not ours.", h);
1355         errno = EACCES;
1356         goto finish;
1357     }
1358 #endif
1359
1360     ret = pa_sprintf_malloc("%s" PA_PATH_SEP ".pulse", h);
1361
1362 finish:
1363     pa_xfree(h);
1364
1365     return ret;
1366 }
1367
1368 char *pa_get_state_dir(void) {
1369     char *d;
1370
1371     /* The state directory shall contain dynamic data that should be
1372      * kept across reboots, and is private to this user */
1373
1374     if (!(d = pa_xstrdup(getenv("PULSE_STATE_PATH"))))
1375         if (!(d = get_pulse_home()))
1376             return NULL;
1377
1378     /* If PULSE_STATE_PATH and PULSE_RUNTIME_PATH point to the same
1379      * dir then this will break. */
1380
1381     if (pa_make_secure_dir(d, 0700U, (uid_t) -1, (gid_t) -1) < 0)  {
1382         pa_log_error("Failed to create secure directory: %s", pa_cstrerror(errno));
1383         pa_xfree(d);
1384         return NULL;
1385     }
1386
1387     return d;
1388 }
1389
1390 char *pa_get_home_dir_malloc(void) {
1391     char *homedir;
1392     size_t allocated = 128;
1393
1394     for (;;) {
1395         homedir = pa_xmalloc(allocated);
1396
1397         if (!pa_get_home_dir(homedir, allocated)) {
1398             pa_xfree(homedir);
1399             return NULL;
1400         }
1401
1402         if (strlen(homedir) < allocated - 1)
1403             break;
1404
1405         pa_xfree(homedir);
1406         allocated *= 2;
1407     }
1408
1409     return homedir;
1410 }
1411
1412 char *pa_get_binary_name_malloc(void) {
1413     char *t;
1414     size_t allocated = 128;
1415
1416     for (;;) {
1417         t = pa_xmalloc(allocated);
1418
1419         if (!pa_get_binary_name(t, allocated)) {
1420             pa_xfree(t);
1421             return NULL;
1422         }
1423
1424         if (strlen(t) < allocated - 1)
1425             break;
1426
1427         pa_xfree(t);
1428         allocated *= 2;
1429     }
1430
1431     return t;
1432 }
1433
1434 static char* make_random_dir(mode_t m) {
1435     static const char table[] =
1436         "abcdefghijklmnopqrstuvwxyz"
1437         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1438         "0123456789";
1439
1440     char *fn;
1441     size_t pathlen;
1442
1443     fn = pa_sprintf_malloc("%s" PA_PATH_SEP "pulse-XXXXXXXXXXXX", pa_get_temp_dir());
1444     pathlen = strlen(fn);
1445
1446     for (;;) {
1447         size_t i;
1448         int r;
1449         mode_t u;
1450         int saved_errno;
1451
1452         for (i = pathlen - 12; i < pathlen; i++)
1453             fn[i] = table[rand() % (sizeof(table)-1)];
1454
1455         u = umask((~m) & 0777);
1456 #ifndef OS_IS_WIN32
1457         r = mkdir(fn, m);
1458 #else
1459         r = mkdir(fn);
1460 #endif
1461
1462         saved_errno = errno;
1463         umask(u);
1464         errno = saved_errno;
1465
1466         if (r >= 0)
1467             return fn;
1468
1469         if (errno != EEXIST) {
1470             pa_log_error("Failed to create random directory %s: %s", fn, pa_cstrerror(errno));
1471             pa_xfree(fn);
1472             return NULL;
1473         }
1474     }
1475 }
1476
1477 static int make_random_dir_and_link(mode_t m, const char *k) {
1478     char *p;
1479
1480     if (!(p = make_random_dir(m)))
1481         return -1;
1482
1483 #ifdef HAVE_SYMLINK
1484     if (symlink(p, k) < 0) {
1485         int saved_errno = errno;
1486
1487         if (errno != EEXIST)
1488             pa_log_error("Failed to symlink %s to %s: %s", k, p, pa_cstrerror(errno));
1489
1490         rmdir(p);
1491         pa_xfree(p);
1492
1493         errno = saved_errno;
1494         return -1;
1495     }
1496 #endif
1497
1498     pa_xfree(p);
1499     return 0;
1500 }
1501
1502 char *pa_get_runtime_dir(void) {
1503     char *d, *k = NULL, *p = NULL, *t = NULL, *mid;
1504     struct stat st;
1505     mode_t m;
1506
1507     /* The runtime directory shall contain dynamic data that needs NOT
1508      * to be kept accross reboots and is usuallly private to the user,
1509      * except in system mode, where it might be accessible by other
1510      * users, too. Since we need POSIX locking and UNIX sockets in
1511      * this directory, we link it to a random subdir in /tmp, if it
1512      * was not explicitly configured. */
1513
1514     m = pa_in_system_mode() ? 0755U : 0700U;
1515
1516     if ((d = getenv("PULSE_RUNTIME_PATH"))) {
1517
1518         if (pa_make_secure_dir(d, m, (uid_t) -1, (gid_t) -1) < 0)  {
1519             pa_log_error("Failed to create secure directory: %s", pa_cstrerror(errno));
1520             goto fail;
1521         }
1522
1523         return pa_xstrdup(d);
1524     }
1525
1526     if (!(d = get_pulse_home()))
1527         goto fail;
1528
1529     if (pa_make_secure_dir(d, m, (uid_t) -1, (gid_t) -1) < 0)  {
1530         pa_log_error("Failed to create secure directory: %s", pa_cstrerror(errno));
1531         pa_xfree(d);
1532         goto fail;
1533     }
1534
1535     if (!(mid = pa_machine_id())) {
1536         pa_xfree(d);
1537         goto fail;
1538     }
1539
1540     k = pa_sprintf_malloc("%s" PA_PATH_SEP "%s-runtime", d, mid);
1541     pa_xfree(d);
1542     pa_xfree(mid);
1543
1544     for (;;) {
1545         /* OK, first let's check if the "runtime" symlink is already
1546          * existant */
1547
1548         if (!(p = pa_readlink(k))) {
1549
1550             if (errno != ENOENT) {
1551                 pa_log_error("Failed to stat runtime directory %s: %s", k, pa_cstrerror(errno));
1552                 goto fail;
1553             }
1554
1555             /* Hmm, so the runtime directory didn't exist yet, so let's
1556              * create one in /tmp and symlink that to it */
1557
1558             if (make_random_dir_and_link(0700, k) < 0) {
1559
1560                 /* Mhmm, maybe another process was quicker than us,
1561                  * let's check if that was valid */
1562                 if (errno == EEXIST)
1563                     continue;
1564
1565                 goto fail;
1566             }
1567
1568             return k;
1569         }
1570
1571         /* Make sure that this actually makes sense */
1572         if (!pa_is_path_absolute(p)) {
1573             pa_log_error("Path %s in link %s is not absolute.", p, k);
1574             errno = ENOENT;
1575             goto fail;
1576         }
1577
1578         /* Hmm, so this symlink is still around, make sure nobody fools
1579          * us */
1580
1581 #ifdef HAVE_LSTAT
1582         if (lstat(p, &st) < 0) {
1583
1584             if (errno != ENOENT) {
1585                 pa_log_error("Failed to stat runtime directory %s: %s", p, pa_cstrerror(errno));
1586                 goto fail;
1587             }
1588
1589         } else {
1590
1591             if (S_ISDIR(st.st_mode) &&
1592                 (st.st_uid == getuid()) &&
1593                 ((st.st_mode & 0777) == 0700)) {
1594
1595                 pa_xfree(p);
1596                 return k;
1597             }
1598
1599             pa_log_info("Hmm, runtime path exists, but points to an invalid directory. Changing runtime directory.");
1600         }
1601 #endif
1602
1603         pa_xfree(p);
1604         p = NULL;
1605
1606         /* Hmm, so the link points to some nonexisting or invalid
1607          * dir. Let's replace it by a new link. We first create a
1608          * temporary link and then rename that to allow concurrent
1609          * execution of this function. */
1610
1611         t = pa_sprintf_malloc("%s.tmp", k);
1612
1613         if (make_random_dir_and_link(0700, t) < 0) {
1614
1615             if (errno != EEXIST) {
1616                 pa_log_error("Failed to symlink %s: %s", t, pa_cstrerror(errno));
1617                 goto fail;
1618             }
1619
1620             pa_xfree(t);
1621             t = NULL;
1622
1623             /* Hmm, someone lese was quicker then us. Let's give
1624              * him some time to finish, and retry. */
1625             pa_msleep(10);
1626             continue;
1627         }
1628
1629         /* OK, we succeeded in creating the temporary symlink, so
1630          * let's rename it */
1631         if (rename(t, k) < 0) {
1632             pa_log_error("Failed to rename %s to %s: %s", t, k, pa_cstrerror(errno));
1633             goto fail;
1634         }
1635
1636         pa_xfree(t);
1637         return k;
1638     }
1639
1640 fail:
1641     pa_xfree(p);
1642     pa_xfree(k);
1643     pa_xfree(t);
1644
1645     return NULL;
1646 }
1647
1648 /* Try to open a configuration file. If "env" is specified, open the
1649  * value of the specified environment variable. Otherwise look for a
1650  * file "local" in the home directory or a file "global" in global
1651  * file system. If "result" is non-NULL, a pointer to a newly
1652  * allocated buffer containing the used configuration file is
1653  * stored there.*/
1654 FILE *pa_open_config_file(const char *global, const char *local, const char *env, char **result) {
1655     const char *fn;
1656 #ifdef OS_IS_WIN32
1657     char buf[PATH_MAX];
1658
1659     if (!getenv(PULSE_ROOTENV))
1660         pa_set_root(NULL);
1661 #endif
1662
1663     if (env && (fn = getenv(env))) {
1664         FILE *f;
1665
1666 #ifdef OS_IS_WIN32
1667         if (!ExpandEnvironmentStrings(fn, buf, PATH_MAX))
1668             /* FIXME: Needs to set errno! */
1669             return NULL;
1670         fn = buf;
1671 #endif
1672
1673         if ((f = pa_fopen_cloexec(fn, "r"))) {
1674             if (result)
1675                 *result = pa_xstrdup(fn);
1676
1677             return f;
1678         }
1679
1680         pa_log_warn("Failed to open configuration file '%s': %s", fn, pa_cstrerror(errno));
1681         return NULL;
1682     }
1683
1684     if (local) {
1685         const char *e;
1686         char *lfn;
1687         char *h;
1688         FILE *f;
1689
1690         if ((e = getenv("PULSE_CONFIG_PATH")))
1691             fn = lfn = pa_sprintf_malloc("%s" PA_PATH_SEP "%s", e, local);
1692         else if ((h = pa_get_home_dir_malloc())) {
1693             fn = lfn = pa_sprintf_malloc("%s" PA_PATH_SEP ".pulse" PA_PATH_SEP "%s", h, local);
1694             pa_xfree(h);
1695         } else
1696             return NULL;
1697
1698 #ifdef OS_IS_WIN32
1699         if (!ExpandEnvironmentStrings(lfn, buf, PATH_MAX)) {
1700             /* FIXME: Needs to set errno! */
1701             pa_xfree(lfn);
1702             return NULL;
1703         }
1704         fn = buf;
1705 #endif
1706
1707         if ((f = pa_fopen_cloexec(fn, "r"))) {
1708             if (result)
1709                 *result = pa_xstrdup(fn);
1710
1711             pa_xfree(lfn);
1712             return f;
1713         }
1714
1715         if (errno != ENOENT) {
1716             pa_log_warn("Failed to open configuration file '%s': %s", fn, pa_cstrerror(errno));
1717             pa_xfree(lfn);
1718             return NULL;
1719         }
1720
1721         pa_xfree(lfn);
1722     }
1723
1724     if (global) {
1725         FILE *f;
1726
1727 #ifdef OS_IS_WIN32
1728         if (!ExpandEnvironmentStrings(global, buf, PATH_MAX))
1729             /* FIXME: Needs to set errno! */
1730             return NULL;
1731         global = buf;
1732 #endif
1733
1734         if ((f = pa_fopen_cloexec(global, "r"))) {
1735
1736             if (result)
1737                 *result = pa_xstrdup(global);
1738
1739             return f;
1740         }
1741     }
1742
1743     errno = ENOENT;
1744     return NULL;
1745 }
1746
1747 char *pa_find_config_file(const char *global, const char *local, const char *env) {
1748     const char *fn;
1749 #ifdef OS_IS_WIN32
1750     char buf[PATH_MAX];
1751
1752     if (!getenv(PULSE_ROOTENV))
1753         pa_set_root(NULL);
1754 #endif
1755
1756     if (env && (fn = getenv(env))) {
1757
1758 #ifdef OS_IS_WIN32
1759         if (!ExpandEnvironmentStrings(fn, buf, PATH_MAX))
1760             /* FIXME: Needs to set errno! */
1761             return NULL;
1762         fn = buf;
1763 #endif
1764
1765         if (access(fn, R_OK) == 0)
1766             return pa_xstrdup(fn);
1767
1768         pa_log_warn("Failed to access configuration file '%s': %s", fn, pa_cstrerror(errno));
1769         return NULL;
1770     }
1771
1772     if (local) {
1773         const char *e;
1774         char *lfn;
1775         char *h;
1776
1777         if ((e = getenv("PULSE_CONFIG_PATH")))
1778             fn = lfn = pa_sprintf_malloc("%s" PA_PATH_SEP "%s", e, local);
1779         else if ((h = pa_get_home_dir_malloc())) {
1780             fn = lfn = pa_sprintf_malloc("%s" PA_PATH_SEP ".pulse" PA_PATH_SEP "%s", h, local);
1781             pa_xfree(h);
1782         } else
1783             return NULL;
1784
1785 #ifdef OS_IS_WIN32
1786         if (!ExpandEnvironmentStrings(lfn, buf, PATH_MAX)) {
1787             /* FIXME: Needs to set errno! */
1788             pa_xfree(lfn);
1789             return NULL;
1790         }
1791         fn = buf;
1792 #endif
1793
1794         if (access(fn, R_OK) == 0) {
1795             char *r = pa_xstrdup(fn);
1796             pa_xfree(lfn);
1797             return r;
1798         }
1799
1800         if (errno != ENOENT) {
1801             pa_log_warn("Failed to access configuration file '%s': %s", fn, pa_cstrerror(errno));
1802             pa_xfree(lfn);
1803             return NULL;
1804         }
1805
1806         pa_xfree(lfn);
1807     }
1808
1809     if (global) {
1810 #ifdef OS_IS_WIN32
1811         if (!ExpandEnvironmentStrings(global, buf, PATH_MAX))
1812             /* FIXME: Needs to set errno! */
1813             return NULL;
1814         global = buf;
1815 #endif
1816
1817         if (access(global, R_OK) == 0)
1818             return pa_xstrdup(global);
1819     }
1820
1821     errno = ENOENT;
1822
1823     return NULL;
1824 }
1825
1826 /* Format the specified data as a hexademical string */
1827 char *pa_hexstr(const uint8_t* d, size_t dlength, char *s, size_t slength) {
1828     size_t i = 0, j = 0;
1829     const char hex[] = "0123456789abcdef";
1830
1831     pa_assert(d);
1832     pa_assert(s);
1833     pa_assert(slength > 0);
1834
1835     while (i < dlength && j+3 <= slength) {
1836         s[j++] = hex[*d >> 4];
1837         s[j++] = hex[*d & 0xF];
1838
1839         d++;
1840         i++;
1841     }
1842
1843     s[j < slength ? j : slength] = 0;
1844     return s;
1845 }
1846
1847 /* Convert a hexadecimal digit to a number or -1 if invalid */
1848 static int hexc(char c) {
1849     if (c >= '0' && c <= '9')
1850         return c - '0';
1851
1852     if (c >= 'A' && c <= 'F')
1853         return c - 'A' + 10;
1854
1855     if (c >= 'a' && c <= 'f')
1856         return c - 'a' + 10;
1857
1858     errno = EINVAL;
1859     return -1;
1860 }
1861
1862 /* Parse a hexadecimal string as created by pa_hexstr() to a BLOB */
1863 size_t pa_parsehex(const char *p, uint8_t *d, size_t dlength) {
1864     size_t j = 0;
1865
1866     pa_assert(p);
1867     pa_assert(d);
1868
1869     while (j < dlength && *p) {
1870         int b;
1871
1872         if ((b = hexc(*(p++))) < 0)
1873             return (size_t) -1;
1874
1875         d[j] = (uint8_t) (b << 4);
1876
1877         if (!*p)
1878             return (size_t) -1;
1879
1880         if ((b = hexc(*(p++))) < 0)
1881             return (size_t) -1;
1882
1883         d[j] |= (uint8_t) b;
1884         j++;
1885     }
1886
1887     return j;
1888 }
1889
1890 /* Returns nonzero when *s starts with *pfx */
1891 pa_bool_t pa_startswith(const char *s, const char *pfx) {
1892     size_t l;
1893
1894     pa_assert(s);
1895     pa_assert(pfx);
1896
1897     l = strlen(pfx);
1898
1899     return strlen(s) >= l && strncmp(s, pfx, l) == 0;
1900 }
1901
1902 /* Returns nonzero when *s ends with *sfx */
1903 pa_bool_t pa_endswith(const char *s, const char *sfx) {
1904     size_t l1, l2;
1905
1906     pa_assert(s);
1907     pa_assert(sfx);
1908
1909     l1 = strlen(s);
1910     l2 = strlen(sfx);
1911
1912     return l1 >= l2 && strcmp(s+l1-l2, sfx) == 0;
1913 }
1914
1915 pa_bool_t pa_is_path_absolute(const char *fn) {
1916     pa_assert(fn);
1917
1918 #ifndef OS_IS_WIN32
1919     return *fn == '/';
1920 #else
1921     return strlen(fn) >= 3 && isalpha(fn[0]) && fn[1] == ':' && fn[2] == '\\';
1922 #endif
1923 }
1924
1925 char *pa_make_path_absolute(const char *p) {
1926     char *r;
1927     char *cwd;
1928
1929     pa_assert(p);
1930
1931     if (pa_is_path_absolute(p))
1932         return pa_xstrdup(p);
1933
1934     if (!(cwd = pa_getcwd()))
1935         return pa_xstrdup(p);
1936
1937     r = pa_sprintf_malloc("%s" PA_PATH_SEP "%s", cwd, p);
1938     pa_xfree(cwd);
1939     return r;
1940 }
1941
1942 /* if fn is null return the PulseAudio run time path in s (~/.pulse)
1943  * if fn is non-null and starts with / return fn
1944  * otherwise append fn to the run time path and return it */
1945 static char *get_path(const char *fn, pa_bool_t prependmid, pa_bool_t rt) {
1946     char *rtp;
1947
1948     rtp = rt ? pa_get_runtime_dir() : pa_get_state_dir();
1949
1950     if (fn) {
1951         char *r;
1952
1953         if (pa_is_path_absolute(fn))
1954             return pa_xstrdup(fn);
1955
1956         if (!rtp)
1957             return NULL;
1958
1959         if (prependmid) {
1960             char *mid;
1961
1962             if (!(mid = pa_machine_id())) {
1963                 pa_xfree(rtp);
1964                 return NULL;
1965             }
1966
1967             r = pa_sprintf_malloc("%s" PA_PATH_SEP "%s-%s", rtp, mid, fn);
1968             pa_xfree(mid);
1969         } else
1970             r = pa_sprintf_malloc("%s" PA_PATH_SEP "%s", rtp, fn);
1971
1972         pa_xfree(rtp);
1973         return r;
1974     } else
1975         return rtp;
1976 }
1977
1978 char *pa_runtime_path(const char *fn) {
1979     return get_path(fn, FALSE, TRUE);
1980 }
1981
1982 char *pa_state_path(const char *fn, pa_bool_t appendmid) {
1983     return get_path(fn, appendmid, FALSE);
1984 }
1985
1986 /* Convert the string s to a signed integer in *ret_i */
1987 int pa_atoi(const char *s, int32_t *ret_i) {
1988     char *x = NULL;
1989     long l;
1990
1991     pa_assert(s);
1992     pa_assert(ret_i);
1993
1994     errno = 0;
1995     l = strtol(s, &x, 0);
1996
1997     if (!x || *x || errno) {
1998         if (!errno)
1999             errno = EINVAL;
2000         return -1;
2001     }
2002
2003     if ((int32_t) l != l) {
2004         errno = ERANGE;
2005         return -1;
2006     }
2007
2008     *ret_i = (int32_t) l;
2009
2010     return 0;
2011 }
2012
2013 /* Convert the string s to an unsigned integer in *ret_u */
2014 int pa_atou(const char *s, uint32_t *ret_u) {
2015     char *x = NULL;
2016     unsigned long l;
2017
2018     pa_assert(s);
2019     pa_assert(ret_u);
2020
2021     errno = 0;
2022     l = strtoul(s, &x, 0);
2023
2024     if (!x || *x || errno) {
2025         if (!errno)
2026             errno = EINVAL;
2027         return -1;
2028     }
2029
2030     if ((uint32_t) l != l) {
2031         errno = ERANGE;
2032         return -1;
2033     }
2034
2035     *ret_u = (uint32_t) l;
2036
2037     return 0;
2038 }
2039
2040 #ifdef HAVE_STRTOF_L
2041 static locale_t c_locale = NULL;
2042
2043 static void c_locale_destroy(void) {
2044     freelocale(c_locale);
2045 }
2046 #endif
2047
2048 int pa_atod(const char *s, double *ret_d) {
2049     char *x = NULL;
2050     double f;
2051
2052     pa_assert(s);
2053     pa_assert(ret_d);
2054
2055     /* This should be locale independent */
2056
2057 #ifdef HAVE_STRTOF_L
2058
2059     PA_ONCE_BEGIN {
2060
2061         if ((c_locale = newlocale(LC_ALL_MASK, "C", NULL)))
2062             atexit(c_locale_destroy);
2063
2064     } PA_ONCE_END;
2065
2066     if (c_locale) {
2067         errno = 0;
2068         f = strtod_l(s, &x, c_locale);
2069     } else
2070 #endif
2071     {
2072         errno = 0;
2073         f = strtod(s, &x);
2074     }
2075
2076     if (!x || *x || errno) {
2077         if (!errno)
2078             errno = EINVAL;
2079         return -1;
2080     }
2081
2082     *ret_d = f;
2083
2084     return 0;
2085 }
2086
2087 /* Same as snprintf, but guarantees NUL-termination on every platform */
2088 size_t pa_snprintf(char *str, size_t size, const char *format, ...) {
2089     size_t ret;
2090     va_list ap;
2091
2092     pa_assert(str);
2093     pa_assert(size > 0);
2094     pa_assert(format);
2095
2096     va_start(ap, format);
2097     ret = pa_vsnprintf(str, size, format, ap);
2098     va_end(ap);
2099
2100     return ret;
2101 }
2102
2103 /* Same as vsnprintf, but guarantees NUL-termination on every platform */
2104 size_t pa_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
2105     int ret;
2106
2107     pa_assert(str);
2108     pa_assert(size > 0);
2109     pa_assert(format);
2110
2111     ret = vsnprintf(str, size, format, ap);
2112
2113     str[size-1] = 0;
2114
2115     if (ret < 0)
2116         return strlen(str);
2117
2118     if ((size_t) ret > size-1)
2119         return size-1;
2120
2121     return (size_t) ret;
2122 }
2123
2124 /* Truncate the specified string, but guarantee that the string
2125  * returned still validates as UTF8 */
2126 char *pa_truncate_utf8(char *c, size_t l) {
2127     pa_assert(c);
2128     pa_assert(pa_utf8_valid(c));
2129
2130     if (strlen(c) <= l)
2131         return c;
2132
2133     c[l] = 0;
2134
2135     while (l > 0 && !pa_utf8_valid(c))
2136         c[--l] = 0;
2137
2138     return c;
2139 }
2140
2141 char *pa_getcwd(void) {
2142     size_t l = 128;
2143
2144     for (;;) {
2145         char *p = pa_xmalloc(l);
2146         if (getcwd(p, l))
2147             return p;
2148
2149         if (errno != ERANGE)
2150             return NULL;
2151
2152         pa_xfree(p);
2153         l *= 2;
2154     }
2155 }
2156
2157 void *pa_will_need(const void *p, size_t l) {
2158 #ifdef RLIMIT_MEMLOCK
2159     struct rlimit rlim;
2160 #endif
2161     const void *a;
2162     size_t size;
2163     int r;
2164     size_t bs;
2165
2166     pa_assert(p);
2167     pa_assert(l > 0);
2168
2169     a = PA_PAGE_ALIGN_PTR(p);
2170     size = (size_t) ((const uint8_t*) p + l - (const uint8_t*) a);
2171
2172 #ifdef HAVE_POSIX_MADVISE
2173     if ((r = posix_madvise((void*) a, size, POSIX_MADV_WILLNEED)) == 0) {
2174         pa_log_debug("posix_madvise() worked fine!");
2175         return (void*) p;
2176     }
2177 #endif
2178
2179     /* Most likely the memory was not mmap()ed from a file and thus
2180      * madvise() didn't work, so let's misuse mlock() do page this
2181      * stuff back into RAM. Yeah, let's fuck with the MM!  It's so
2182      * inviting, the man page of mlock() tells us: "All pages that
2183      * contain a part of the specified address range are guaranteed to
2184      * be resident in RAM when the call returns successfully." */
2185
2186 #ifdef RLIMIT_MEMLOCK
2187     pa_assert_se(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
2188
2189     if (rlim.rlim_cur < PA_PAGE_SIZE) {
2190         pa_log_debug("posix_madvise() failed (or doesn't exist), resource limits don't allow mlock(), can't page in data: %s", pa_cstrerror(r));
2191         errno = EPERM;
2192         return (void*) p;
2193     }
2194
2195     bs = PA_PAGE_ALIGN((size_t) rlim.rlim_cur);
2196 #else
2197     bs = PA_PAGE_SIZE*4;
2198 #endif
2199
2200     pa_log_debug("posix_madvise() failed (or doesn't exist), trying mlock(): %s", pa_cstrerror(r));
2201
2202 #ifdef HAVE_MLOCK
2203     while (size > 0 && bs > 0) {
2204
2205         if (bs > size)
2206             bs = size;
2207
2208         if (mlock(a, bs) < 0) {
2209             bs = PA_PAGE_ALIGN(bs / 2);
2210             continue;
2211         }
2212
2213         pa_assert_se(munlock(a, bs) == 0);
2214
2215         a = (const uint8_t*) a + bs;
2216         size -= bs;
2217     }
2218 #endif
2219
2220     if (bs <= 0)
2221         pa_log_debug("mlock() failed too (or doesn't exist), giving up: %s", pa_cstrerror(errno));
2222     else
2223         pa_log_debug("mlock() worked fine!");
2224
2225     return (void*) p;
2226 }
2227
2228 void pa_close_pipe(int fds[2]) {
2229     pa_assert(fds);
2230
2231     if (fds[0] >= 0)
2232         pa_assert_se(pa_close(fds[0]) == 0);
2233
2234     if (fds[1] >= 0)
2235         pa_assert_se(pa_close(fds[1]) == 0);
2236
2237     fds[0] = fds[1] = -1;
2238 }
2239
2240 char *pa_readlink(const char *p) {
2241 #ifdef HAVE_READLINK
2242     size_t l = 100;
2243
2244     for (;;) {
2245         char *c;
2246         ssize_t n;
2247
2248         c = pa_xmalloc(l);
2249
2250         if ((n = readlink(p, c, l-1)) < 0) {
2251             pa_xfree(c);
2252             return NULL;
2253         }
2254
2255         if ((size_t) n < l-1) {
2256             c[n] = 0;
2257             return c;
2258         }
2259
2260         pa_xfree(c);
2261         l *= 2;
2262     }
2263 #else
2264     return NULL;
2265 #endif
2266 }
2267
2268 int pa_close_all(int except_fd, ...) {
2269     va_list ap;
2270     unsigned n = 0, i;
2271     int r, *p;
2272
2273     va_start(ap, except_fd);
2274
2275     if (except_fd >= 0)
2276         for (n = 1; va_arg(ap, int) >= 0; n++)
2277             ;
2278
2279     va_end(ap);
2280
2281     p = pa_xnew(int, n+1);
2282
2283     va_start(ap, except_fd);
2284
2285     i = 0;
2286     if (except_fd >= 0) {
2287         int fd;
2288         p[i++] = except_fd;
2289
2290         while ((fd = va_arg(ap, int)) >= 0)
2291             p[i++] = fd;
2292     }
2293     p[i] = -1;
2294
2295     va_end(ap);
2296
2297     r = pa_close_allv(p);
2298     pa_xfree(p);
2299
2300     return r;
2301 }
2302
2303 int pa_close_allv(const int except_fds[]) {
2304 #ifndef OS_IS_WIN32
2305     struct rlimit rl;
2306     int maxfd, fd;
2307
2308 #ifdef __linux__
2309     int saved_errno;
2310     DIR *d;
2311
2312     if ((d = opendir("/proc/self/fd"))) {
2313
2314         struct dirent *de;
2315
2316         while ((de = readdir(d))) {
2317             pa_bool_t found;
2318             long l;
2319             char *e = NULL;
2320             int i;
2321
2322             if (de->d_name[0] == '.')
2323                 continue;
2324
2325             errno = 0;
2326             l = strtol(de->d_name, &e, 10);
2327             if (errno != 0 || !e || *e) {
2328                 closedir(d);
2329                 errno = EINVAL;
2330                 return -1;
2331             }
2332
2333             fd = (int) l;
2334
2335             if ((long) fd != l) {
2336                 closedir(d);
2337                 errno = EINVAL;
2338                 return -1;
2339             }
2340
2341             if (fd < 3)
2342                 continue;
2343
2344             if (fd == dirfd(d))
2345                 continue;
2346
2347             found = FALSE;
2348             for (i = 0; except_fds[i] >= 0; i++)
2349                 if (except_fds[i] == fd) {
2350                     found = TRUE;
2351                     break;
2352                 }
2353
2354             if (found)
2355                 continue;
2356
2357             if (pa_close(fd) < 0) {
2358                 saved_errno = errno;
2359                 closedir(d);
2360                 errno = saved_errno;
2361
2362                 return -1;
2363             }
2364         }
2365
2366         closedir(d);
2367         return 0;
2368     }
2369
2370 #endif
2371
2372     if (getrlimit(RLIMIT_NOFILE, &rl) >= 0)
2373         maxfd = (int) rl.rlim_max;
2374     else
2375         maxfd = sysconf(_SC_OPEN_MAX);
2376
2377     for (fd = 3; fd < maxfd; fd++) {
2378         int i;
2379         pa_bool_t found;
2380
2381         found = FALSE;
2382         for (i = 0; except_fds[i] >= 0; i++)
2383             if (except_fds[i] == fd) {
2384                 found = TRUE;
2385                 break;
2386             }
2387
2388         if (found)
2389             continue;
2390
2391         if (pa_close(fd) < 0 && errno != EBADF)
2392             return -1;
2393     }
2394 #endif  /* !OS_IS_WIN32 */
2395
2396     return 0;
2397 }
2398
2399 int pa_unblock_sigs(int except, ...) {
2400     va_list ap;
2401     unsigned n = 0, i;
2402     int r, *p;
2403
2404     va_start(ap, except);
2405
2406     if (except >= 1)
2407         for (n = 1; va_arg(ap, int) >= 0; n++)
2408             ;
2409
2410     va_end(ap);
2411
2412     p = pa_xnew(int, n+1);
2413
2414     va_start(ap, except);
2415
2416     i = 0;
2417     if (except >= 1) {
2418         int sig;
2419         p[i++] = except;
2420
2421         while ((sig = va_arg(ap, int)) >= 0)
2422             p[i++] = sig;
2423     }
2424     p[i] = -1;
2425
2426     va_end(ap);
2427
2428     r = pa_unblock_sigsv(p);
2429     pa_xfree(p);
2430
2431     return r;
2432 }
2433
2434 int pa_unblock_sigsv(const int except[]) {
2435 #ifndef OS_IS_WIN32
2436     int i;
2437     sigset_t ss;
2438
2439     if (sigemptyset(&ss) < 0)
2440         return -1;
2441
2442     for (i = 0; except[i] > 0; i++)
2443         if (sigaddset(&ss, except[i]) < 0)
2444             return -1;
2445
2446     return sigprocmask(SIG_SETMASK, &ss, NULL);
2447 #else
2448     return 0;
2449 #endif
2450 }
2451
2452 int pa_reset_sigs(int except, ...) {
2453     va_list ap;
2454     unsigned n = 0, i;
2455     int *p, r;
2456
2457     va_start(ap, except);
2458
2459     if (except >= 1)
2460         for (n = 1; va_arg(ap, int) >= 0; n++)
2461             ;
2462
2463     va_end(ap);
2464
2465     p = pa_xnew(int, n+1);
2466
2467     va_start(ap, except);
2468
2469     i = 0;
2470     if (except >= 1) {
2471         int sig;
2472         p[i++] = except;
2473
2474         while ((sig = va_arg(ap, int)) >= 0)
2475             p[i++] = sig;
2476     }
2477     p[i] = -1;
2478
2479     va_end(ap);
2480
2481     r = pa_reset_sigsv(p);
2482     pa_xfree(p);
2483
2484     return r;
2485 }
2486
2487 int pa_reset_sigsv(const int except[]) {
2488 #ifndef OS_IS_WIN32
2489     int sig;
2490
2491     for (sig = 1; sig < NSIG; sig++) {
2492         pa_bool_t reset = TRUE;
2493
2494         switch (sig) {
2495             case SIGKILL:
2496             case SIGSTOP:
2497                 reset = FALSE;
2498                 break;
2499
2500             default: {
2501                 int i;
2502
2503                 for (i = 0; except[i] > 0; i++) {
2504                     if (sig == except[i]) {
2505                         reset = FALSE;
2506                         break;
2507                     }
2508                 }
2509             }
2510         }
2511
2512         if (reset) {
2513             struct sigaction sa;
2514
2515             memset(&sa, 0, sizeof(sa));
2516             sa.sa_handler = SIG_DFL;
2517
2518             /* On Linux the first two RT signals are reserved by
2519              * glibc, and sigaction() will return EINVAL for them. */
2520             if ((sigaction(sig, &sa, NULL) < 0))
2521                 if (errno != EINVAL)
2522                     return -1;
2523         }
2524     }
2525 #endif
2526
2527     return 0;
2528 }
2529
2530 void pa_set_env(const char *key, const char *value) {
2531     pa_assert(key);
2532     pa_assert(value);
2533
2534     /* This is not thread-safe */
2535
2536     setenv(key, value, 1);
2537 }
2538
2539 void pa_set_env_and_record(const char *key, const char *value) {
2540     pa_assert(key);
2541     pa_assert(value);
2542
2543     /* This is not thread-safe */
2544
2545     pa_set_env(key, value);
2546     recorded_env = pa_strlist_prepend(recorded_env, key);
2547 }
2548
2549 void pa_unset_env_recorded(void) {
2550
2551     /* This is not thread-safe */
2552
2553     for (;;) {
2554         char *s;
2555
2556         recorded_env = pa_strlist_pop(recorded_env, &s);
2557
2558         if (!s)
2559             break;
2560
2561         unsetenv(s);
2562         pa_xfree(s);
2563     }
2564 }
2565
2566 pa_bool_t pa_in_system_mode(void) {
2567     const char *e;
2568
2569     if (!(e = getenv("PULSE_SYSTEM")))
2570         return FALSE;
2571
2572     return !!atoi(e);
2573 }
2574
2575 char *pa_get_user_name_malloc(void) {
2576     ssize_t k;
2577     char *u;
2578
2579 #ifdef _SC_LOGIN_NAME_MAX
2580     k = (ssize_t) sysconf(_SC_LOGIN_NAME_MAX);
2581
2582     if (k <= 0)
2583 #endif
2584         k = 32;
2585
2586     u = pa_xnew(char, k+1);
2587
2588     if (!(pa_get_user_name(u, k))) {
2589         pa_xfree(u);
2590         return NULL;
2591     }
2592
2593     return u;
2594 }
2595
2596 char *pa_get_host_name_malloc(void) {
2597     size_t l;
2598
2599     l = 100;
2600     for (;;) {
2601         char *c;
2602
2603         c = pa_xmalloc(l);
2604
2605         if (!pa_get_host_name(c, l)) {
2606
2607             if (errno != EINVAL && errno != ENAMETOOLONG)
2608                 break;
2609
2610         } else if (strlen(c) < l-1) {
2611             char *u;
2612
2613             if (*c == 0) {
2614                 pa_xfree(c);
2615                 break;
2616             }
2617
2618             u = pa_utf8_filter(c);
2619             pa_xfree(c);
2620             return u;
2621         }
2622
2623         /* Hmm, the hostname is as long the space we offered the
2624          * function, we cannot know if it fully fit in, so let's play
2625          * safe and retry. */
2626
2627         pa_xfree(c);
2628         l *= 2;
2629     }
2630
2631     return NULL;
2632 }
2633
2634 char *pa_machine_id(void) {
2635     FILE *f;
2636     char *h;
2637
2638     /* The returned value is supposed be some kind of ascii identifier
2639      * that is unique and stable across reboots. */
2640
2641     /* First we try the D-Bus UUID, which is the best option we have,
2642      * since it fits perfectly our needs and is not as volatile as the
2643      * hostname which might be set from dhcp. */
2644
2645     if ((f = pa_fopen_cloexec(PA_MACHINE_ID, "r"))) {
2646         char ln[34] = "", *r;
2647
2648         r = fgets(ln, sizeof(ln)-1, f);
2649         fclose(f);
2650
2651         pa_strip_nl(ln);
2652
2653         if (r && ln[0])
2654             return pa_utf8_filter(ln);
2655     }
2656
2657     if ((h = pa_get_host_name_malloc()))
2658         return h;
2659
2660 #ifndef OS_IS_WIN32
2661     /* If no hostname was set we use the POSIX hostid. It's usually
2662      * the IPv4 address.  Might not be that stable. */
2663     return pa_sprintf_malloc("%08lx", (unsigned long) gethostid);
2664 #else
2665     return NULL;
2666 #endif
2667 }
2668
2669 char *pa_session_id(void) {
2670     const char *e;
2671
2672     if (!(e = getenv("XDG_SESSION_COOKIE")))
2673         return NULL;
2674
2675     return pa_utf8_filter(e);
2676 }
2677
2678 char *pa_uname_string(void) {
2679     struct utsname u;
2680
2681     pa_assert_se(uname(&u) >= 0);
2682
2683     return pa_sprintf_malloc("%s %s %s %s", u.sysname, u.machine, u.release, u.version);
2684 }
2685
2686 #ifdef HAVE_VALGRIND_MEMCHECK_H
2687 pa_bool_t pa_in_valgrind(void) {
2688     static int b = 0;
2689
2690     /* To make heisenbugs a bit simpler to find we check for $VALGRIND
2691      * here instead of really checking whether we run in valgrind or
2692      * not. */
2693
2694     if (b < 1)
2695         b = getenv("VALGRIND") ? 2 : 1;
2696
2697     return b > 1;
2698 }
2699 #endif
2700
2701 unsigned pa_gcd(unsigned a, unsigned b) {
2702
2703     while (b > 0) {
2704         unsigned t = b;
2705         b = a % b;
2706         a = t;
2707     }
2708
2709     return a;
2710 }
2711
2712 void pa_reduce(unsigned *num, unsigned *den) {
2713
2714     unsigned gcd = pa_gcd(*num, *den);
2715
2716     if (gcd <= 0)
2717         return;
2718
2719     *num /= gcd;
2720     *den /= gcd;
2721
2722     pa_assert(pa_gcd(*num, *den) == 1);
2723 }
2724
2725 unsigned pa_ncpus(void) {
2726     long ncpus;
2727
2728 #ifdef _SC_NPROCESSORS_CONF
2729     ncpus = sysconf(_SC_NPROCESSORS_CONF);
2730 #else
2731     ncpus = 1;
2732 #endif
2733
2734     return ncpus <= 0 ? 1 : (unsigned) ncpus;
2735 }
2736
2737 char *pa_replace(const char*s, const char*a, const char *b) {
2738     pa_strbuf *sb;
2739     size_t an;
2740
2741     pa_assert(s);
2742     pa_assert(a);
2743     pa_assert(b);
2744
2745     an = strlen(a);
2746     sb = pa_strbuf_new();
2747
2748     for (;;) {
2749         const char *p;
2750
2751         if (!(p = strstr(s, a)))
2752             break;
2753
2754         pa_strbuf_putsn(sb, s, p-s);
2755         pa_strbuf_puts(sb, b);
2756         s = p + an;
2757     }
2758
2759     pa_strbuf_puts(sb, s);
2760
2761     return pa_strbuf_tostring_free(sb);
2762 }
2763
2764 char *pa_escape(const char *p, const char *chars) {
2765     const char *s;
2766     const char *c;
2767     pa_strbuf *buf = pa_strbuf_new();
2768
2769     for (s = p; *s; ++s) {
2770         if (*s == '\\')
2771             pa_strbuf_putc(buf, '\\');
2772         else if (chars) {
2773             for (c = chars; *c; ++c) {
2774                 if (*s == *c) {
2775                     pa_strbuf_putc(buf, '\\');
2776                     break;
2777                 }
2778             }
2779         }
2780         pa_strbuf_putc(buf, *s);
2781     }
2782
2783     return pa_strbuf_tostring_free(buf);
2784 }
2785
2786 char *pa_unescape(char *p) {
2787     char *s, *d;
2788     pa_bool_t escaped = FALSE;
2789
2790     for (s = p, d = p; *s; s++) {
2791         if (!escaped && *s == '\\') {
2792             escaped = TRUE;
2793             continue;
2794         }
2795
2796         *(d++) = *s;
2797         escaped = FALSE;
2798     }
2799
2800     *d = 0;
2801
2802     return p;
2803 }
2804
2805 char *pa_realpath(const char *path) {
2806     char *t;
2807     pa_assert(path);
2808
2809     /* We want only abolsute paths */
2810     if (path[0] != '/') {
2811         errno = EINVAL;
2812         return NULL;
2813     }
2814
2815 #if defined(__GLIBC__) || defined(__APPLE__)
2816     {
2817         char *r;
2818
2819         if (!(r = realpath(path, NULL)))
2820             return NULL;
2821
2822         /* We copy this here in case our pa_xmalloc() is not
2823          * implemented on top of libc malloc() */
2824         t = pa_xstrdup(r);
2825         pa_xfree(r);
2826     }
2827 #elif defined(PATH_MAX)
2828     {
2829         char *path_buf;
2830         path_buf = pa_xmalloc(PATH_MAX);
2831
2832         if (!(t = realpath(path, path_buf))) {
2833             pa_xfree(path_buf);
2834             return NULL;
2835         }
2836     }
2837 #else
2838 #error "It's not clear whether this system supports realpath(..., NULL) like GNU libc does. If it doesn't we need a private version of realpath() here."
2839 #endif
2840
2841     return t;
2842 }
2843
2844 void pa_disable_sigpipe(void) {
2845
2846 #ifdef SIGPIPE
2847     struct sigaction sa;
2848
2849     pa_zero(sa);
2850
2851     if (sigaction(SIGPIPE, NULL, &sa) < 0) {
2852         pa_log("sigaction(): %s", pa_cstrerror(errno));
2853         return;
2854     }
2855
2856     sa.sa_handler = SIG_IGN;
2857
2858     if (sigaction(SIGPIPE, &sa, NULL) < 0) {
2859         pa_log("sigaction(): %s", pa_cstrerror(errno));
2860         return;
2861     }
2862 #endif
2863 }
2864
2865 void pa_xfreev(void**a) {
2866     void **p;
2867
2868     if (!a)
2869         return;
2870
2871     for (p = a; *p; p++)
2872         pa_xfree(*p);
2873
2874     pa_xfree(a);
2875 }
2876
2877 char **pa_split_spaces_strv(const char *s) {
2878     char **t, *e;
2879     unsigned i = 0, n = 8;
2880     const char *state = NULL;
2881
2882     t = pa_xnew(char*, n);
2883     while ((e = pa_split_spaces(s, &state))) {
2884         t[i++] = e;
2885
2886         if (i >= n) {
2887             n *= 2;
2888             t = pa_xrenew(char*, t, n);
2889         }
2890     }
2891
2892     if (i <= 0) {
2893         pa_xfree(t);
2894         return NULL;
2895     }
2896
2897     t[i] = NULL;
2898     return t;
2899 }
2900
2901 char* pa_maybe_prefix_path(const char *path, const char *prefix) {
2902     pa_assert(path);
2903
2904     if (pa_is_path_absolute(path))
2905         return pa_xstrdup(path);
2906
2907     return pa_sprintf_malloc("%s" PA_PATH_SEP "%s", prefix, path);
2908 }
2909
2910 size_t pa_pipe_buf(int fd) {
2911
2912 #ifdef _PC_PIPE_BUF
2913     long n;
2914
2915     if ((n = fpathconf(fd, _PC_PIPE_BUF)) >= 0)
2916         return (size_t) n;
2917 #endif
2918
2919 #ifdef PIPE_BUF
2920     return PIPE_BUF;
2921 #else
2922     return 4096;
2923 #endif
2924 }
2925
2926 void pa_reset_personality(void) {
2927
2928 #ifdef __linux__
2929     if (personality(PER_LINUX) < 0)
2930         pa_log_warn("Uh, personality() failed: %s", pa_cstrerror(errno));
2931 #endif
2932
2933 }
2934
2935 #if defined(__linux__) && !defined(__OPTIMIZE__)
2936
2937 pa_bool_t pa_run_from_build_tree(void) {
2938     char *rp;
2939     pa_bool_t b = FALSE;
2940
2941     /* We abuse __OPTIMIZE__ as a check whether we are a debug build
2942      * or not. */
2943
2944     if ((rp = pa_readlink("/proc/self/exe"))) {
2945         b = pa_startswith(rp, PA_BUILDDIR);
2946         pa_xfree(rp);
2947     }
2948
2949     return b;
2950 }
2951
2952 #endif
2953
2954 const char *pa_get_temp_dir(void) {
2955     const char *t;
2956
2957     if ((t = getenv("TMPDIR")) &&
2958         pa_is_path_absolute(t))
2959         return t;
2960
2961     if ((t = getenv("TMP")) &&
2962         pa_is_path_absolute(t))
2963         return t;
2964
2965     if ((t = getenv("TEMP")) &&
2966         pa_is_path_absolute(t))
2967         return t;
2968
2969     if ((t = getenv("TEMPDIR")) &&
2970         pa_is_path_absolute(t))
2971         return t;
2972
2973     return "/tmp";
2974 }
2975
2976 int pa_open_cloexec(const char *fn, int flags, mode_t mode) {
2977     int fd;
2978
2979 #ifdef O_NOCTTY
2980     flags |= O_NOCTTY;
2981 #endif
2982
2983 #ifdef O_CLOEXEC
2984     if ((fd = open(fn, flags|O_CLOEXEC, mode)) >= 0)
2985         goto finish;
2986
2987     if (errno != EINVAL)
2988         return fd;
2989 #endif
2990
2991     if ((fd = open(fn, flags, mode)) < 0)
2992         return fd;
2993
2994 finish:
2995     /* Some implementations might simply ignore O_CLOEXEC if it is not
2996      * understood, make sure FD_CLOEXEC is enabled anyway */
2997
2998     pa_make_fd_cloexec(fd);
2999     return fd;
3000 }
3001
3002 int pa_socket_cloexec(int domain, int type, int protocol) {
3003     int fd;
3004
3005 #ifdef SOCK_CLOEXEC
3006     if ((fd = socket(domain, type | SOCK_CLOEXEC, protocol)) >= 0)
3007         goto finish;
3008
3009     if (errno != EINVAL)
3010         return fd;
3011 #endif
3012
3013     if ((fd = socket(domain, type, protocol)) < 0)
3014         return fd;
3015
3016 finish:
3017     /* Some implementations might simply ignore SOCK_CLOEXEC if it is
3018      * not understood, make sure FD_CLOEXEC is enabled anyway */
3019
3020     pa_make_fd_cloexec(fd);
3021     return fd;
3022 }
3023
3024 int pa_pipe_cloexec(int pipefd[2]) {
3025     int r;
3026
3027 #ifdef HAVE_PIPE2
3028     if ((r = pipe2(pipefd, O_CLOEXEC)) >= 0)
3029         goto finish;
3030
3031     if (errno != EINVAL && errno != ENOSYS)
3032         return r;
3033
3034 #endif
3035
3036     if ((r = pipe(pipefd)) < 0)
3037         return r;
3038
3039 finish:
3040     pa_make_fd_cloexec(pipefd[0]);
3041     pa_make_fd_cloexec(pipefd[1]);
3042
3043     return 0;
3044 }
3045
3046 int pa_accept_cloexec(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
3047     int fd;
3048
3049 #ifdef HAVE_ACCEPT4
3050     if ((fd = accept4(sockfd, addr, addrlen, SOCK_CLOEXEC)) >= 0)
3051         goto finish;
3052
3053     if (errno != EINVAL && errno != ENOSYS)
3054         return fd;
3055
3056 #endif
3057
3058     if ((fd = accept(sockfd, addr, addrlen)) < 0)
3059         return fd;
3060
3061 finish:
3062     pa_make_fd_cloexec(fd);
3063     return fd;
3064 }
3065
3066 FILE* pa_fopen_cloexec(const char *path, const char *mode) {
3067     FILE *f;
3068     char *m;
3069
3070     m = pa_sprintf_malloc("%se", mode);
3071
3072     errno = 0;
3073     if ((f = fopen(path, m))) {
3074         pa_xfree(m);
3075         goto finish;
3076     }
3077
3078     pa_xfree(m);
3079
3080     if (errno != EINVAL)
3081         return NULL;
3082
3083     if (!(f = fopen(path, mode)))
3084         return NULL;
3085
3086 finish:
3087     pa_make_fd_cloexec(fileno(f));
3088     return f;
3089 }
3090
3091 void pa_nullify_stdfds(void) {
3092
3093 #ifndef OS_IS_WIN32
3094         pa_close(STDIN_FILENO);
3095         pa_close(STDOUT_FILENO);
3096         pa_close(STDERR_FILENO);
3097
3098         pa_assert_se(open("/dev/null", O_RDONLY) == STDIN_FILENO);
3099         pa_assert_se(open("/dev/null", O_WRONLY) == STDOUT_FILENO);
3100         pa_assert_se(open("/dev/null", O_WRONLY) == STDERR_FILENO);
3101 #else
3102         FreeConsole();
3103 #endif
3104
3105 }
3106
3107 char *pa_read_line_from_file(const char *fn) {
3108     FILE *f;
3109     char ln[256] = "", *r;
3110
3111     if (!(f = pa_fopen_cloexec(fn, "r")))
3112         return NULL;
3113
3114     r = fgets(ln, sizeof(ln)-1, f);
3115     fclose(f);
3116
3117     if (!r) {
3118         errno = EIO;
3119         return NULL;
3120     }
3121
3122     pa_strip_nl(ln);
3123     return pa_xstrdup(ln);
3124 }
3125
3126 pa_bool_t pa_running_in_vm(void) {
3127
3128 #if defined(__i386__) || defined(__x86_64__)
3129
3130     /* Both CPUID and DMI are x86 specific interfaces... */
3131
3132     uint32_t eax = 0x40000000;
3133     union {
3134         uint32_t sig32[3];
3135         char text[13];
3136     } sig;
3137
3138 #ifdef __linux__
3139     const char *const dmi_vendors[] = {
3140         "/sys/class/dmi/id/sys_vendor",
3141         "/sys/class/dmi/id/board_vendor",
3142         "/sys/class/dmi/id/bios_vendor"
3143     };
3144
3145     unsigned i;
3146
3147     for (i = 0; i < PA_ELEMENTSOF(dmi_vendors); i++) {
3148         char *s;
3149
3150         if ((s = pa_read_line_from_file(dmi_vendors[i]))) {
3151
3152             if (pa_startswith(s, "QEMU") ||
3153                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
3154                 pa_startswith(s, "VMware") ||
3155                 pa_startswith(s, "VMW") ||
3156                 pa_startswith(s, "Microsoft Corporation") ||
3157                 pa_startswith(s, "innotek GmbH") ||
3158                 pa_startswith(s, "Xen")) {
3159
3160                 pa_xfree(s);
3161                 return TRUE;
3162             }
3163
3164             pa_xfree(s);
3165         }
3166     }
3167
3168 #endif
3169
3170     /* http://lwn.net/Articles/301888/ */
3171     pa_zero(sig);
3172
3173     __asm__ __volatile__ (
3174         /* ebx/rbx is being used for PIC! */
3175         "  push %%"PA_REG_b"         \n\t"
3176         "  cpuid                     \n\t"
3177         "  mov %%ebx, %1             \n\t"
3178         "  pop %%"PA_REG_b"          \n\t"
3179
3180         : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
3181         : "0" (eax)
3182     );
3183
3184     if (pa_streq(sig.text, "XenVMMXenVMM") ||
3185         pa_streq(sig.text, "KVMKVMKVM") ||
3186         /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
3187         pa_streq(sig.text, "VMwareVMware") ||
3188         /* http://msdn.microsoft.com/en-us/library/bb969719.aspx */
3189         pa_streq(sig.text, "Microsoft Hv"))
3190         return TRUE;
3191
3192 #endif
3193
3194     return FALSE;
3195 }