src/pulse/util.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as
   9   published by the Free Software Foundation; either version 2.1 of the
  10   License, or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public
  18   License along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <errno.h>
  28 #include <limits.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <time.h>
  33 #include <unistd.h>
  34 #include <sys/types.h>
  35
  36 #ifdef HAVE_PWD_H
  37 #include <pwd.h>
  38 #endif
  39
  40 #ifdef HAVE_SYS_SOCKET_H
  41 #include <sys/socket.h>
  42 #endif
  43
  44 #ifdef HAVE_NETDB_H
  45 #include <netdb.h>
  46 #endif
  47
  48 #ifdef HAVE_WINDOWS_H
  49 #include <windows.h>
  50 #endif
  51
  52 #ifdef HAVE_SYS_PRCTL_H
  53 #include <sys/prctl.h>
  54 #endif
  55
  56 #include <pulse/xmalloc.h>
  57 #include <pulse/timeval.h>
  58
  59 #include <pulsecore/winsock.h>
  60 #include <pulsecore/core-error.h>
  61 #include <pulsecore/log.h>
  62 #include <pulsecore/core-util.h>
  63 #include <pulsecore/macro.h>
  64 #include <pulsecore/usergroup.h>
  65
  66 #include "util.h"
  67
  68 char *pa_get_user_name(char *s, size_t l) {
  69     const char *p;
  70     char *name = NULL;
  71 #ifdef OS_IS_WIN32
  72     char buf[1024];
  73 #endif
  74
  75 #ifdef HAVE_PWD_H
  76     struct passwd *r;
  77 #endif
  78
  79     pa_assert(s);
  80     pa_assert(l > 0);
  81
  82     if ((p = (getuid() == 0 ? "root" : NULL)) ||
  83         (p = getenv("USER")) ||
  84         (p = getenv("LOGNAME")) ||
  85         (p = getenv("USERNAME")))
  86     {
  87         name = pa_strlcpy(s, p, l);
  88     } else {
  89 #ifdef HAVE_PWD_H
  90
  91         if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
  92             pa_snprintf(s, l, "%lu", (unsigned long) getuid());
  93             return s;
  94         }
  95
  96         name = pa_strlcpy(s, r->pw_name, l);
  97         pa_getpwuid_free(r);
  98
  99 #elif defined(OS_IS_WIN32) /* HAVE_PWD_H */
 100         DWORD size = sizeof(buf);
 101
 102         if (!GetUserName(buf, &size)) {
 103             errno = ENOENT;
 104             return NULL;
 105         }
 106
 107         name = pa_strlcpy(s, buf, l);
 108
 109 #else /* HAVE_PWD_H */
 110
 111         return NULL;
 112 #endif /* HAVE_PWD_H */
 113     }
 114
 115     return name;
 116 }
 117
 118 char *pa_get_host_name(char *s, size_t l) {
 119
 120     pa_assert(s);
 121     pa_assert(l > 0);
 122
 123     if (gethostname(s, l) < 0)
 124         return NULL;
 125
 126     s[l-1] = 0;
 127     return s;
 128 }
 129
 130 char *pa_get_home_dir(char *s, size_t l) {
 131     char *e, *dir;
 132
 133 #ifdef HAVE_PWD_H
 134     struct passwd *r;
 135 #endif
 136
 137     pa_assert(s);
 138     pa_assert(l > 0);
 139
 140     if ((e = getenv("HOME")))
 141         return pa_strlcpy(s, e, l);
 142
 143     if ((e = getenv("USERPROFILE")))
 144         return pa_strlcpy(s, e, l);
 145
 146 #ifdef HAVE_PWD_H
 147     errno = 0;
 148     if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
 149         if (!errno)
 150             errno = ENOENT;
 151
 152         return NULL;
 153     }
 154
 155     dir = pa_strlcpy(s, r->pw_dir, l);
 156
 157     pa_getpwuid_free(r);
 158
 159     return dir;
 160 #else /* HAVE_PWD_H */
 161
 162     errno = ENOENT;
 163     return NULL;
 164 #endif
 165 }
 166
 167 char *pa_get_binary_name(char *s, size_t l) {
 168
 169     pa_assert(s);
 170     pa_assert(l > 0);
 171
 172 #if defined(OS_IS_WIN32)
 173     {
 174         char path[PATH_MAX];
 175
 176         if (GetModuleFileName(NULL, path, PATH_MAX))
 177             return pa_strlcpy(s, pa_path_get_filename(path), l);
 178     }
 179 #endif
 180
 181 #ifdef __linux__
 182     {
 183         char *rp;
 184         /* This works on Linux only */
 185
 186         if ((rp = pa_readlink("/proc/self/exe"))) {
 187             pa_strlcpy(s, pa_path_get_filename(rp), l);
 188             pa_xfree(rp);
 189             return s;
 190         }
 191     }
 192
 193 #endif
 194
 195 #if defined(HAVE_SYS_PRCTL_H) && defined(PR_GET_NAME)
 196     {
 197
 198         #ifndef TASK_COMM_LEN
 199         /* Actually defined in linux/sched.h */
 200         #define TASK_COMM_LEN 16
 201         #endif
 202
 203         char tcomm[TASK_COMM_LEN+1];
 204         memset(tcomm, 0, sizeof(tcomm));
 205
 206         /* This works on Linux only */
 207         if (prctl(PR_GET_NAME, (unsigned long) tcomm, 0, 0, 0) == 0)
 208             return pa_strlcpy(s, tcomm, l);
 209
 210     }
 211 #endif
 212
 213     errno = ENOENT;
 214     return NULL;
 215 }
 216
 217 char *pa_path_get_filename(const char *p) {
 218     char *fn;
 219
 220     if (!p)
 221         return NULL;
 222
 223     if ((fn = strrchr(p, PA_PATH_SEP_CHAR)))
 224         return fn+1;
 225
 226     return (char*) p;
 227 }
 228
 229 char *pa_get_fqdn(char *s, size_t l) {
 230     char hn[256];
 231 #ifdef HAVE_GETADDRINFO
 232     struct addrinfo *a, hints;
 233 #endif
 234
 235     pa_assert(s);
 236     pa_assert(l > 0);
 237
 238     if (!pa_get_host_name(hn, sizeof(hn)))
 239         return NULL;
 240
 241 #ifdef HAVE_GETADDRINFO
 242     memset(&hints, 0, sizeof(hints));
 243     hints.ai_family = AF_UNSPEC;
 244     hints.ai_flags = AI_CANONNAME;
 245
 246     if (getaddrinfo(hn, NULL, &hints, &a) < 0 || !a || !a->ai_canonname || !*a->ai_canonname)
 247         return pa_strlcpy(s, hn, l);
 248
 249     pa_strlcpy(s, a->ai_canonname, l);
 250     freeaddrinfo(a);
 251     return s;
 252 #else
 253     return pa_strlcpy(s, hn, l);
 254 #endif
 255 }
 256
 257 int pa_msleep(unsigned long t) {
 258 #ifdef OS_IS_WIN32
 259     Sleep(t);
 260     return 0;
 261 #elif defined(HAVE_NANOSLEEP)
 262     struct timespec ts;
 263
 264     ts.tv_sec = (time_t) (t / PA_MSEC_PER_SEC);
 265     ts.tv_nsec = (long) ((t % PA_MSEC_PER_SEC) * PA_NSEC_PER_MSEC);
 266
 267     return nanosleep(&ts, NULL);
 268 #else
 269 #error "Platform lacks a sleep function."
 270 #endif
 271 }