mono/utils/mono-proclib.c

   1 /**
   2  * \file
   3  * Copyright 2008-2011 Novell Inc
   4  * Copyright 2011 Xamarin Inc
   5  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   6  */
   7
   8 #include "config.h"
   9 #include "utils/mono-proclib.h"
  10 #include "utils/mono-time.h"
  11
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <fcntl.h>
  16 #ifdef HAVE_UNISTD_H
  17 #include <unistd.h>
  18 #endif
  19 #ifdef HAVE_SCHED_GETAFFINITY
  20 #include <sched.h>
  21 #endif
  22
  23 #if defined(_POSIX_VERSION)
  24 #ifdef HAVE_SYS_ERRNO_H
  25 #include <sys/errno.h>
  26 #endif
  27 #include <sys/param.h>
  28 #include <errno.h>
  29 #ifdef HAVE_SYS_TYPES_H
  30 #include <sys/types.h>
  31 #endif
  32 #ifdef HAVE_SYS_SYSCTL_H
  33 #include <sys/sysctl.h>
  34 #endif
  35 #include <sys/resource.h>
  36 #endif
  37 #if defined(__HAIKU__)
  38 #include <os/kernel/OS.h>
  39 #endif
  40 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
  41 #include <sys/proc.h>
  42 #if defined(__APPLE__)
  43 #include <mach/mach.h>
  44 #endif
  45 #ifdef HAVE_SYS_USER_H
  46 #include <sys/user.h>
  47 #endif
  48 #ifdef HAVE_STRUCT_KINFO_PROC_KP_PROC
  49 #    define kinfo_starttime_member kp_proc.p_starttime
  50 #    define kinfo_pid_member kp_proc.p_pid
  51 #    define kinfo_name_member kp_proc.p_comm
  52 #elif defined(__NetBSD__)
  53 #    define kinfo_starttime_member p_ustart_sec
  54 #    define kinfo_pid_member p_pid
  55 #    define kinfo_name_member p_comm
  56 #elif defined(__OpenBSD__)
  57 // Can not figure out how to get the proc's start time on OpenBSD
  58 #    undef kinfo_starttime_member
  59 #    define kinfo_pid_member p_pid
  60 #    define kinfo_name_member p_comm
  61 #else
  62 #define kinfo_starttime_member ki_start
  63 #define kinfo_pid_member ki_pid
  64 #define kinfo_name_member ki_comm
  65 #endif
  66 #define USE_SYSCTL 1
  67 #endif
  68
  69 #ifdef HAVE_SCHED_GETAFFINITY
  70 #  ifndef GLIBC_HAS_CPU_COUNT
  71 static int
  72 CPU_COUNT(cpu_set_t *set)
  73 {
  74         int i, count = 0;
  75
  76         for (int i = 0; i < CPU_SETSIZE; i++)
  77                 if (CPU_ISSET(i, set))
  78                         count++;
  79         return count;
  80 }
  81 #  endif
  82 #endif
  83
  84 /**
  85  * mono_process_list:
  86  * \param size a pointer to a location where the size of the returned array is stored
  87  * \returns an array of pid values for the processes currently running on the system.
  88  * The size of the array is stored in \p size.
  89  */
  90 gpointer*
  91 mono_process_list (int *size)
  92 {
  93 #if USE_SYSCTL
  94         int res, i;
  95 #ifdef KERN_PROC2
  96         int mib [6];
  97         size_t data_len = sizeof (struct kinfo_proc2) * 400;
  98         struct kinfo_proc2 *processes = g_malloc (data_len);
  99 #else
 100         int mib [4];
 101         size_t data_len = sizeof (struct kinfo_proc) * 16;
 102         struct kinfo_proc *processes;
 103         int limit = 8;
 104 #endif /* KERN_PROC2 */
 105         void **buf = NULL;
 106
 107         if (size)
 108                 *size = 0;
 109
 110 #ifdef KERN_PROC2
 111         if (!processes)
 112                 return NULL;
 113
 114         mib [0] = CTL_KERN;
 115         mib [1] = KERN_PROC2;
 116         mib [2] = KERN_PROC_ALL;
 117         mib [3] = 0;
 118         mib [4] = sizeof(struct kinfo_proc2);
 119         mib [5] = 400; /* XXX */
 120
 121         res = sysctl (mib, 6, processes, &data_len, NULL, 0);
 122         if (res < 0) {
 123                 g_free (processes);
 124                 return NULL;
 125         }
 126 #else
 127         processes = NULL;
 128         while (limit) {
 129                 mib [0] = CTL_KERN;
 130                 mib [1] = KERN_PROC;
 131                 mib [2] = KERN_PROC_ALL;
 132                 mib [3] = 0;
 133
 134                 res = sysctl (mib, 4, NULL, &data_len, NULL, 0);
 135                 if (res)
 136                         return NULL;
 137                 processes = (struct kinfo_proc *) g_malloc (data_len);
 138                 res = sysctl (mib, 4, processes, &data_len, NULL, 0);
 139                 if (res < 0) {
 140                         g_free (processes);
 141                         if (errno != ENOMEM)
 142                                 return NULL;
 143                         limit --;
 144                 } else {
 145                         break;
 146                 }
 147         }
 148 #endif /* KERN_PROC2 */
 149
 150 #ifdef KERN_PROC2
 151         res = data_len/sizeof (struct kinfo_proc2);
 152 #else
 153         res = data_len/sizeof (struct kinfo_proc);
 154 #endif /* KERN_PROC2 */
 155         buf = (void **) g_realloc (buf, res * sizeof (void*));
 156         for (i = 0; i < res; ++i)
 157                 buf [i] = GINT_TO_POINTER (processes [i].kinfo_pid_member);
 158         g_free (processes);
 159         if (size)
 160                 *size = res;
 161         return buf;
 162 #elif defined(__HAIKU__)
 163         int32 cookie = 0;
 164         int32 i = 0;
 165         team_info ti;
 166         system_info si;
 167
 168         get_system_info(&si);
 169         void **buf = g_calloc(si.used_teams, sizeof(void*));
 170
 171         while (get_next_team_info(&cookie, &ti) == B_OK && i < si.used_teams) {
 172                 buf[i++] = GINT_TO_POINTER (ti.team);
 173         }
 174         *size = i;
 175
 176         return buf;
 177 #else
 178         const char *name;
 179         void **buf = NULL;
 180         int count = 0;
 181         int i = 0;
 182         GDir *dir = g_dir_open ("/proc/", 0, NULL);
 183         if (!dir) {
 184                 if (size)
 185                         *size = 0;
 186                 return NULL;
 187         }
 188         while ((name = g_dir_read_name (dir))) {
 189                 int pid;
 190                 char *nend;
 191                 pid = strtol (name, &nend, 10);
 192                 if (pid <= 0 || nend == name || *nend)
 193                         continue;
 194                 if (i >= count) {
 195                         if (!count)
 196                                 count = 16;
 197                         else
 198                                 count *= 2;
 199                         buf = (void **)g_realloc (buf, count * sizeof (void*));
 200                 }
 201                 buf [i++] = GINT_TO_POINTER (pid);
 202         }
 203         g_dir_close (dir);
 204         if (size)
 205                 *size = i;
 206         return buf;
 207 #endif
 208 }
 209
 210 static G_GNUC_UNUSED char*
 211 get_pid_status_item_buf (int pid, const char *item, char *rbuf, int blen, MonoProcessError *error)
 212 {
 213         char buf [256];
 214         char *s;
 215         FILE *f;
 216         size_t len = strlen (item);
 217
 218         g_snprintf (buf, sizeof (buf), "/proc/%d/status", pid);
 219         f = fopen (buf, "r");
 220         if (!f) {
 221                 if (error)
 222                         *error = MONO_PROCESS_ERROR_NOT_FOUND;
 223                 return NULL;
 224         }
 225         while ((s = fgets (buf, sizeof (buf), f))) {
 226                 if (*item != *buf)
 227                         continue;
 228                 if (strncmp (buf, item, len))
 229                         continue;
 230                 s = buf + len;
 231                 while (g_ascii_isspace (*s)) s++;
 232                 if (*s++ != ':')
 233                         continue;
 234                 while (g_ascii_isspace (*s)) s++;
 235                 fclose (f);
 236                 len = strlen (s);
 237                 memcpy (rbuf, s, MIN (len, blen));
 238                 rbuf [MIN (len, blen) - 1] = 0;
 239                 if (error)
 240                         *error = MONO_PROCESS_ERROR_NONE;
 241                 return rbuf;
 242         }
 243         fclose (f);
 244         if (error)
 245                 *error = MONO_PROCESS_ERROR_OTHER;
 246         return NULL;
 247 }
 248
 249 #if USE_SYSCTL
 250
 251 #ifdef KERN_PROC2
 252 #define KINFO_PROC struct kinfo_proc2
 253 #else
 254 #define KINFO_PROC struct kinfo_proc
 255 #endif
 256
 257 static gboolean
 258 sysctl_kinfo_proc (gpointer pid, KINFO_PROC* processi)
 259 {
 260         int res;
 261         size_t data_len = sizeof (KINFO_PROC);
 262
 263 #ifdef KERN_PROC2
 264         int mib [6];
 265         mib [0] = CTL_KERN;
 266         mib [1] = KERN_PROC2;
 267         mib [2] = KERN_PROC_PID;
 268         mib [3] = GPOINTER_TO_UINT (pid);
 269         mib [4] = sizeof(KINFO_PROC);
 270         mib [5] = 400; /* XXX */
 271
 272         res = sysctl (mib, 6, processi, &data_len, NULL, 0);
 273 #else
 274         int mib [4];
 275         mib [0] = CTL_KERN;
 276         mib [1] = KERN_PROC;
 277         mib [2] = KERN_PROC_PID;
 278         mib [3] = GPOINTER_TO_UINT (pid);
 279
 280         res = sysctl (mib, 4, processi, &data_len, NULL, 0);
 281 #endif /* KERN_PROC2 */
 282
 283         if (res < 0 || data_len != sizeof (KINFO_PROC))
 284                 return FALSE;
 285
 286         return TRUE;
 287 }
 288 #endif /* USE_SYSCTL */
 289
 290 /**
 291  * mono_process_get_name:
 292  * \param pid pid of the process
 293  * \param buf byte buffer where to store the name of the prcoess
 294  * \param len size of the buffer \p buf
 295  * \returns the name of the process identified by \p pid, storing it
 296  * inside \p buf for a maximum of len bytes (including the terminating 0).
 297  */
 298 char*
 299 mono_process_get_name (gpointer pid, char *buf, int len)
 300 {
 301 #if USE_SYSCTL
 302         KINFO_PROC processi;
 303
 304         memset (buf, 0, len);
 305
 306         if (sysctl_kinfo_proc (pid, &processi))
 307                 memcpy (buf, processi.kinfo_name_member, len - 1);
 308
 309         return buf;
 310 #else
 311         char fname [128];
 312         FILE *file;
 313         char *p;
 314         size_t r;
 315         sprintf (fname, "/proc/%d/cmdline", GPOINTER_TO_INT (pid));
 316         buf [0] = 0;
 317         file = fopen (fname, "r");
 318         if (!file)
 319                 return buf;
 320         r = fread (buf, 1, len - 1, file);
 321         fclose (file);
 322         buf [r] = 0;
 323         p = strrchr (buf, '/');
 324         if (p)
 325                 return p + 1;
 326         if (r == 0) {
 327                 return get_pid_status_item_buf (GPOINTER_TO_INT (pid), "Name", buf, len, NULL);
 328         }
 329         return buf;
 330 #endif
 331 }
 332
 333 void
 334 mono_process_get_times (gpointer pid, gint64 *start_time, gint64 *user_time, gint64 *kernel_time)
 335 {
 336         if (user_time)
 337                 *user_time = mono_process_get_data (pid, MONO_PROCESS_USER_TIME);
 338
 339         if (kernel_time)
 340                 *kernel_time = mono_process_get_data (pid, MONO_PROCESS_SYSTEM_TIME);
 341
 342         if (start_time) {
 343                 *start_time = 0;
 344
 345 #if USE_SYSCTL && defined(kinfo_starttime_member)
 346                 {
 347                         KINFO_PROC processi;
 348
 349                         if (sysctl_kinfo_proc (pid, &processi)) {
 350 #if defined(__NetBSD__)
 351                                 struct timeval tv;
 352                                 tv.tv_sec = processi.kinfo_starttime_member;
 353                                 tv.tv_usec = processi.p_ustart_usec;
 354                                 *start_time = mono_100ns_datetime_from_timeval(tv);
 355 #else
 356                                 *start_time = mono_100ns_datetime_from_timeval (processi.kinfo_starttime_member);
 357 #endif
 358                         }
 359                 }
 360 #endif
 361
 362                 if (*start_time == 0) {
 363                         static guint64 boot_time = 0;
 364                         if (!boot_time)
 365                                 boot_time = mono_100ns_datetime () - mono_msec_boottime () * 10000;
 366
 367                         *start_time = boot_time + mono_process_get_data (pid, MONO_PROCESS_ELAPSED);
 368                 }
 369         }
 370 }
 371
 372 /*
 373  * /proc/pid/stat format:
 374  * pid (cmdname) S
 375  *      [0] ppid pgid sid tty_nr tty_pgrp flags min_flt cmin_flt maj_flt cmaj_flt
 376  *      [10] utime stime cutime cstime prio nice threads 0 start_time vsize
 377  *      [20] rss rsslim start_code end_code start_stack esp eip pending blocked sigign
 378  *      [30] sigcatch wchan 0 0 exit_signal cpu rt_prio policy
 379  */
 380
 381 #define RET_ERROR(err) do {     \
 382                 if (error) *error = (err);      \
 383                 return 0;                       \
 384         } while (0)
 385
 386 static gint64
 387 get_process_stat_item (int pid, int pos, int sum, MonoProcessError *error)
 388 {
 389 #if defined(__APPLE__)
 390         double process_user_time = 0, process_system_time = 0;//, process_percent = 0;
 391         task_t task;
 392         struct task_basic_info t_info;
 393         mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT, th_count;
 394         thread_array_t th_array;
 395         size_t i;
 396         kern_return_t ret;
 397
 398         if (pid == getpid ()) {
 399                 /* task_for_pid () doesn't work on ios, even for the current process */
 400                 task = mach_task_self ();
 401         } else {
 402                 do {
 403                         ret = task_for_pid (mach_task_self (), pid, &task);
 404                 } while (ret == KERN_ABORTED);
 405
 406                 if (ret != KERN_SUCCESS)
 407                         RET_ERROR (MONO_PROCESS_ERROR_NOT_FOUND);
 408         }
 409
 410         do {
 411                 ret = task_info (task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
 412         } while (ret == KERN_ABORTED);
 413
 414         if (ret != KERN_SUCCESS) {
 415                 if (pid != getpid ())
 416                         mach_port_deallocate (mach_task_self (), task);
 417                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 418         }
 419
 420         do {
 421                 ret = task_threads (task, &th_array, &th_count);
 422         } while (ret == KERN_ABORTED);
 423
 424         if (ret  != KERN_SUCCESS) {
 425                 if (pid != getpid ())
 426                         mach_port_deallocate (mach_task_self (), task);
 427                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 428         }
 429
 430         for (i = 0; i < th_count; i++) {
 431                 double thread_user_time, thread_system_time;//, thread_percent;
 432
 433                 struct thread_basic_info th_info;
 434                 mach_msg_type_number_t th_info_count = THREAD_BASIC_INFO_COUNT;
 435                 do {
 436                         ret = thread_info(th_array[i], THREAD_BASIC_INFO, (thread_info_t)&th_info, &th_info_count);
 437                 } while (ret == KERN_ABORTED);
 438
 439                 if (ret == KERN_SUCCESS) {
 440                         thread_user_time = th_info.user_time.seconds + th_info.user_time.microseconds / 1e6;
 441                         thread_system_time = th_info.system_time.seconds + th_info.system_time.microseconds / 1e6;
 442                         //thread_percent = (double)th_info.cpu_usage / TH_USAGE_SCALE;
 443
 444                         process_user_time += thread_user_time;
 445                         process_system_time += thread_system_time;
 446                         //process_percent += th_percent;
 447                 }
 448         }
 449
 450         for (i = 0; i < th_count; i++)
 451                 mach_port_deallocate(task, th_array[i]);
 452
 453         if (pid != getpid ())
 454                 mach_port_deallocate (mach_task_self (), task);
 455
 456         process_user_time += t_info.user_time.seconds + t_info.user_time.microseconds / 1e6;
 457         process_system_time += t_info.system_time.seconds + t_info.system_time.microseconds / 1e6;
 458
 459         if (pos == 10 && sum == TRUE)
 460                 return (gint64)((process_user_time + process_system_time) * 10000000);
 461         else if (pos == 10)
 462                 return (gint64)(process_user_time * 10000000);
 463         else if (pos == 11)
 464                 return (gint64)(process_system_time * 10000000);
 465
 466         return 0;
 467 #else
 468         char buf [512];
 469         char *s, *end;
 470         FILE *f;
 471         size_t len;
 472         int i;
 473         gint64 value;
 474
 475         g_snprintf (buf, sizeof (buf), "/proc/%d/stat", pid);
 476         f = fopen (buf, "r");
 477         if (!f)
 478                 RET_ERROR (MONO_PROCESS_ERROR_NOT_FOUND);
 479         len = fread (buf, 1, sizeof (buf), f);
 480         fclose (f);
 481         if (len <= 0)
 482                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 483         s = strchr (buf, ')');
 484         if (!s)
 485                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 486         s++;
 487         while (g_ascii_isspace (*s)) s++;
 488         if (!*s)
 489                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 490         /* skip the status char */
 491         while (*s && !g_ascii_isspace (*s)) s++;
 492         if (!*s)
 493                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 494         for (i = 0; i < pos; ++i) {
 495                 while (g_ascii_isspace (*s)) s++;
 496                 if (!*s)
 497                         RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 498                 while (*s && !g_ascii_isspace (*s)) s++;
 499                 if (!*s)
 500                         RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 501         }
 502         /* we are finally at the needed item */
 503         value = strtoul (s, &end, 0);
 504         /* add also the following value */
 505         if (sum) {
 506                 while (g_ascii_isspace (*s)) s++;
 507                 if (!*s)
 508                         RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 509                 value += strtoul (s, &end, 0);
 510         }
 511         if (error)
 512                 *error = MONO_PROCESS_ERROR_NONE;
 513         return value;
 514 #endif
 515 }
 516
 517 static int
 518 get_user_hz (void)
 519 {
 520         static int user_hz = 0;
 521         if (user_hz == 0) {
 522 #ifdef _SC_CLK_TCK
 523                 user_hz = sysconf (_SC_CLK_TCK);
 524 #endif
 525                 if (user_hz == 0)
 526                         user_hz = 100;
 527         }
 528         return user_hz;
 529 }
 530
 531 static gint64
 532 get_process_stat_time (int pid, int pos, int sum, MonoProcessError *error)
 533 {
 534         gint64 val = get_process_stat_item (pid, pos, sum, error);
 535 #if defined(__APPLE__)
 536         return val;
 537 #else
 538         /* return 100ns ticks */
 539         return (val * 10000000) / get_user_hz ();
 540 #endif
 541 }
 542
 543 static gint64
 544 get_pid_status_item (int pid, const char *item, MonoProcessError *error, int multiplier)
 545 {
 546 #if defined(__APPLE__)
 547         // ignore the multiplier
 548
 549         gint64 ret;
 550         task_t task;
 551         struct task_basic_info t_info;
 552         mach_msg_type_number_t th_count = TASK_BASIC_INFO_COUNT;
 553         kern_return_t mach_ret;
 554
 555         if (pid == getpid ()) {
 556                 /* task_for_pid () doesn't work on ios, even for the current process */
 557                 task = mach_task_self ();
 558         } else {
 559                 do {
 560                         mach_ret = task_for_pid (mach_task_self (), pid, &task);
 561                 } while (mach_ret == KERN_ABORTED);
 562
 563                 if (mach_ret != KERN_SUCCESS)
 564                         RET_ERROR (MONO_PROCESS_ERROR_NOT_FOUND);
 565         }
 566
 567         do {
 568                 mach_ret = task_info (task, TASK_BASIC_INFO, (task_info_t)&t_info, &th_count);
 569         } while (mach_ret == KERN_ABORTED);
 570
 571         if (mach_ret != KERN_SUCCESS) {
 572                 if (pid != getpid ())
 573                         mach_port_deallocate (mach_task_self (), task);
 574                 RET_ERROR (MONO_PROCESS_ERROR_OTHER);
 575         }
 576
 577         if (strcmp (item, "VmRSS") == 0 || strcmp (item, "VmHWM") == 0 || strcmp (item, "VmData") == 0)
 578                 ret = t_info.resident_size;
 579         else if (strcmp (item, "VmSize") == 0 || strcmp (item, "VmPeak") == 0)
 580                 ret = t_info.virtual_size;
 581         else if (strcmp (item, "Threads") == 0)
 582                 ret = th_count;
 583         else
 584                 ret = 0;
 585
 586         if (pid != getpid ())
 587                 mach_port_deallocate (mach_task_self (), task);
 588
 589         return ret;
 590 #else
 591         char buf [64];
 592         char *s;
 593
 594         s = get_pid_status_item_buf (pid, item, buf, sizeof (buf), error);
 595         if (s)
 596                 return ((gint64) atol (s)) * multiplier;
 597         return 0;
 598 #endif
 599 }
 600
 601 /**
 602  * mono_process_get_data:
 603  * \param pid pid of the process
 604  * \param data description of data to return
 605  * \returns a data item of a process like user time, memory use etc,
 606  * according to the \p data argumet.
 607  */
 608 gint64
 609 mono_process_get_data_with_error (gpointer pid, MonoProcessData data, MonoProcessError *error)
 610 {
 611         gint64 val;
 612         int rpid = GPOINTER_TO_INT (pid);
 613
 614         if (error)
 615                 *error = MONO_PROCESS_ERROR_OTHER;
 616
 617         switch (data) {
 618         case MONO_PROCESS_NUM_THREADS:
 619                 return get_pid_status_item (rpid, "Threads", error, 1);
 620         case MONO_PROCESS_USER_TIME:
 621                 return get_process_stat_time (rpid, 10, FALSE, error);
 622         case MONO_PROCESS_SYSTEM_TIME:
 623                 return get_process_stat_time (rpid, 11, FALSE, error);
 624         case MONO_PROCESS_TOTAL_TIME:
 625                 return get_process_stat_time (rpid, 10, TRUE, error);
 626         case MONO_PROCESS_WORKING_SET:
 627                 return get_pid_status_item (rpid, "VmRSS", error, 1024);
 628         case MONO_PROCESS_WORKING_SET_PEAK:
 629                 val = get_pid_status_item (rpid, "VmHWM", error, 1024);
 630                 if (val == 0)
 631                         val = get_pid_status_item (rpid, "VmRSS", error, 1024);
 632                 return val;
 633         case MONO_PROCESS_PRIVATE_BYTES:
 634                 return get_pid_status_item (rpid, "VmData", error, 1024);
 635         case MONO_PROCESS_VIRTUAL_BYTES:
 636                 return get_pid_status_item (rpid, "VmSize", error, 1024);
 637         case MONO_PROCESS_VIRTUAL_BYTES_PEAK:
 638                 val = get_pid_status_item (rpid, "VmPeak", error, 1024);
 639                 if (val == 0)
 640                         val = get_pid_status_item (rpid, "VmSize", error, 1024);
 641                 return val;
 642         case MONO_PROCESS_FAULTS:
 643                 return get_process_stat_item (rpid, 6, TRUE, error);
 644         case MONO_PROCESS_ELAPSED:
 645                 return get_process_stat_time (rpid, 18, FALSE, error);
 646         case MONO_PROCESS_PPID:
 647                 return get_process_stat_time (rpid, 0, FALSE, error);
 648         case MONO_PROCESS_PAGED_BYTES:
 649                 return get_pid_status_item (rpid, "VmSwap", error, 1024);
 650
 651                 /* Nothing yet */
 652         case MONO_PROCESS_END:
 653                 return 0;
 654         }
 655         return 0;
 656 }
 657
 658 gint64
 659 mono_process_get_data (gpointer pid, MonoProcessData data)
 660 {
 661         MonoProcessError error;
 662         return mono_process_get_data_with_error (pid, data, &error);
 663 }
 664
 665 #ifndef HOST_WIN32
 666 int
 667 mono_process_current_pid ()
 668 {
 669 #if defined(HAVE_UNISTD_H)
 670         return (int) getpid ();
 671 #else
 672 #error getpid
 673 #endif
 674 }
 675 #endif /* !HOST_WIN32 */
 676
 677 /**
 678  * mono_cpu_count:
 679  * \returns the number of processors on the system.
 680  */
 681 #ifndef HOST_WIN32
 682 int
 683 mono_cpu_count (void)
 684 {
 685 #ifdef PLATFORM_ANDROID
 686         /* Android tries really hard to save power by powering off CPUs on SMP phones which
 687          * means the normal way to query cpu count returns a wrong value with userspace API.
 688          * Instead we use /sys entries to query the actual hardware CPU count.
 689          */
 690         int count = 0;
 691         char buffer[8] = {'\0'};
 692         int present = open ("/sys/devices/system/cpu/present", O_RDONLY);
 693         /* Format of the /sys entry is a cpulist of indexes which in the case
 694          * of present is always of the form "0-(n-1)" when there is more than
 695          * 1 core, n being the number of CPU cores in the system. Otherwise
 696          * the value is simply 0
 697          */
 698         if (present != -1 && read (present, (char*)buffer, sizeof (buffer)) > 3)
 699                 count = strtol (((char*)buffer) + 2, NULL, 10);
 700         if (present != -1)
 701                 close (present);
 702         if (count > 0)
 703                 return count + 1;
 704 #endif
 705
 706 #if defined(HOST_ARM) || defined (HOST_ARM64)
 707
 708 /*
 709  * Recap from Alexander Köplinger <alex.koeplinger@outlook.com>:
 710  *
 711  * When we merged the change from PR #2722, we started seeing random failures on ARM in
 712  * the MonoTests.System.Threading.ThreadPoolTests.SetAndGetMaxThreads and
 713  * MonoTests.System.Threading.ManualResetEventSlimTests.Constructor_Defaults tests. Both
 714  * of those tests are dealing with Environment.ProcessorCount to verify some implementation
 715  * details.
 716  *
 717  * It turns out that on the Jetson TK1 board we use on public Jenkins and on ARM kernels
 718  * in general, the value returned by sched_getaffinity (or _SC_NPROCESSORS_ONLN) doesn't
 719  * contain CPUs/cores that are powered off for power saving reasons. This is contrary to
 720  * what happens on x86, where even cores in deep-sleep state are returned [1], [2]. This
 721  * means that we would get a processor count of 1 at one point in time and a higher value
 722  * when load increases later on as the system wakes CPUs.
 723  *
 724  * Various runtime pieces like the threadpool and also user code however relies on the
 725  * value returned by Environment.ProcessorCount e.g. for deciding how many parallel tasks
 726  * to start, thereby limiting the performance when that code thinks we only have one CPU.
 727  *
 728  * Talking to a few people, this was the reason why we changed to _SC_NPROCESSORS_CONF in
 729  * mono#1688 and why we added a special case for Android in mono@de3addc to get the "real"
 730  * number of processors in the system.
 731  *
 732  * Because of those issues Android/Dalvik also switched from _ONLN to _SC_NPROCESSORS_CONF
 733  * for the Java API Runtime.availableProcessors() too [3], citing:
 734  * > Traditionally this returned the number currently online, but many mobile devices are
 735  * able to take unused cores offline to save power, so releases newer than Android 4.2 (Jelly
 736  * Bean) return the maximum number of cores that could be made available if there were no
 737  * power or heat constraints.
 738  *
 739  * The problem with sticking to _SC_NPROCESSORS_CONF however is that it breaks down in
 740  * constrained environments like Docker or with an explicit CPU affinity set by the Linux
 741  * `taskset` command, They'd get a higher CPU count than can be used, start more threads etc.
 742  * which results in unnecessary context switches and overloaded systems. That's why we need
 743  * to respect sched_getaffinity.
 744  *
 745  * So while in an ideal world we would be able to rely on sched_getaffinity/_SC_NPROCESSORS_ONLN
 746  * to return the number of theoretically available CPUs regardless of power saving measures
 747  * everywhere, we can't do this on ARM.
 748  *
 749  * I think the pragmatic solution is the following:
 750  * * use sched_getaffinity (+ fallback to _SC_NPROCESSORS_ONLN in case of error) on x86. This
 751  * ensures we're inline with what OpenJDK [4] and CoreCLR [5] do
 752  * * use _SC_NPROCESSORS_CONF exclusively on ARM (I think we could eventually even get rid of
 753  * the PLATFORM_ANDROID special case)
 754  *
 755  * Helpful links:
 756  *
 757  * [1] https://sourceware.org/ml/libc-alpha/2013-07/msg00383.html
 758  * [2] https://lists.01.org/pipermail/powertop/2012-September/000433.html
 759  * [3] https://android.googlesource.com/platform/libcore/+/750dc634e56c58d1d04f6a138734ac2b772900b5%5E1..750dc634e56c58d1d04f6a138734ac2b772900b5/
 760  * [4] https://bugs.openjdk.java.net/browse/JDK-6515172
 761  * [5] https://github.com/dotnet/coreclr/blob/7058273693db2555f127ce16e6b0c5b40fb04867/src/pal/src/misc/sysinfo.cpp#L148
 762  */
 763
 764 #ifdef _SC_NPROCESSORS_CONF
 765         {
 766                 int count = sysconf (_SC_NPROCESSORS_CONF);
 767                 if (count > 0)
 768                         return count;
 769         }
 770 #endif
 771
 772 #else
 773
 774 #ifdef HAVE_SCHED_GETAFFINITY
 775         {
 776                 cpu_set_t set;
 777                 if (sched_getaffinity (mono_process_current_pid (), sizeof (set), &set) == 0)
 778                         return CPU_COUNT (&set);
 779         }
 780 #endif
 781 #ifdef _SC_NPROCESSORS_ONLN
 782         {
 783                 int count = sysconf (_SC_NPROCESSORS_ONLN);
 784                 if (count > 0)
 785                         return count;
 786         }
 787 #endif
 788
 789 #endif /* defined(HOST_ARM) || defined (HOST_ARM64) */
 790
 791 #ifdef USE_SYSCTL
 792         {
 793                 int count;
 794                 int mib [2];
 795                 size_t len = sizeof (int);
 796                 mib [0] = CTL_HW;
 797                 mib [1] = HW_NCPU;
 798                 if (sysctl (mib, 2, &count, &len, NULL, 0) == 0)
 799                         return count;
 800         }
 801 #endif
 802         /* FIXME: warn */
 803         return 1;
 804 }
 805 #endif /* !HOST_WIN32 */
 806
 807 static void
 808 get_cpu_times (int cpu_id, gint64 *user, gint64 *systemt, gint64 *irq, gint64 *sirq, gint64 *idle)
 809 {
 810         char buf [256];
 811         char *s;
 812         int hz = get_user_hz ();
 813         guint64 user_ticks = 0, nice_ticks = 0, system_ticks = 0, idle_ticks = 0, irq_ticks = 0, sirq_ticks = 0;
 814         FILE *f = fopen ("/proc/stat", "r");
 815         if (!f)
 816                 return;
 817         if (cpu_id < 0)
 818                 hz *= mono_cpu_count ();
 819         while ((s = fgets (buf, sizeof (buf), f))) {
 820                 char *data = NULL;
 821                 if (cpu_id < 0 && strncmp (s, "cpu", 3) == 0 && g_ascii_isspace (s [3])) {
 822                         data = s + 4;
 823                 } else if (cpu_id >= 0 && strncmp (s, "cpu", 3) == 0 && strtol (s + 3, &data, 10) == cpu_id) {
 824                         if (data == s + 3)
 825                                 continue;
 826                         data++;
 827                 } else {
 828                         continue;
 829                 }
 830
 831                 user_ticks = strtoull (data, &data, 10);
 832                 nice_ticks = strtoull (data, &data, 10);
 833                 system_ticks = strtoull (data, &data, 10);
 834                 idle_ticks = strtoull (data, &data, 10);
 835                 /* iowait_ticks = strtoull (data, &data, 10); */
 836                 irq_ticks = strtoull (data, &data, 10);
 837                 sirq_ticks = strtoull (data, &data, 10);
 838                 break;
 839         }
 840         fclose (f);
 841
 842         if (user)
 843                 *user = (user_ticks + nice_ticks) * 10000000 / hz;
 844         if (systemt)
 845                 *systemt = (system_ticks) * 10000000 / hz;
 846         if (irq)
 847                 *irq = (irq_ticks) * 10000000 / hz;
 848         if (sirq)
 849                 *sirq = (sirq_ticks) * 10000000 / hz;
 850         if (idle)
 851                 *idle = (idle_ticks) * 10000000 / hz;
 852 }
 853
 854 /**
 855  * mono_cpu_get_data:
 856  * \param cpu_id processor number or -1 to get a summary of all the processors
 857  * \param data type of data to retrieve
 858  * Get data about a processor on the system, like time spent in user space or idle time.
 859  */
 860 gint64
 861 mono_cpu_get_data (int cpu_id, MonoCpuData data, MonoProcessError *error)
 862 {
 863         gint64 value = 0;
 864
 865         if (error)
 866                 *error = MONO_PROCESS_ERROR_NONE;
 867         switch (data) {
 868         case MONO_CPU_USER_TIME:
 869                 get_cpu_times (cpu_id, &value, NULL, NULL, NULL, NULL);
 870                 break;
 871         case MONO_CPU_PRIV_TIME:
 872                 get_cpu_times (cpu_id, NULL, &value, NULL, NULL, NULL);
 873                 break;
 874         case MONO_CPU_INTR_TIME:
 875                 get_cpu_times (cpu_id, NULL, NULL, &value, NULL, NULL);
 876                 break;
 877         case MONO_CPU_DCP_TIME:
 878                 get_cpu_times (cpu_id, NULL, NULL, NULL, &value, NULL);
 879                 break;
 880         case MONO_CPU_IDLE_TIME:
 881                 get_cpu_times (cpu_id, NULL, NULL, NULL, NULL, &value);
 882                 break;
 883
 884         case MONO_CPU_END:
 885                 /* Nothing yet */
 886                 return 0;
 887         }
 888         return value;
 889 }
 890
 891 int
 892 mono_atexit (void (*func)(void))
 893 {
 894 #ifdef PLATFORM_ANDROID
 895         /* Some versions of android libc doesn't define atexit () */
 896         return 0;
 897 #else
 898         return atexit (func);
 899 #endif
 900 }
 901
 902 /*
 903  * This function returns the cpu usage in percentage,
 904  * normalized on the number of cores.
 905  *
 906  * Warning : the percentage returned can be > 100%. This
 907  * might happens on systems like Android which, for
 908  * battery and performance reasons, shut down cores and
 909  * lie about the number of active cores.
 910  */
 911 #ifndef HOST_WIN32
 912 gint32
 913 mono_cpu_usage (MonoCpuUsageState *prev)
 914 {
 915         gint32 cpu_usage = 0;
 916         gint64 cpu_total_time;
 917         gint64 cpu_busy_time;
 918         struct rusage resource_usage;
 919         gint64 current_time;
 920         gint64 kernel_time;
 921         gint64 user_time;
 922
 923         if (getrusage (RUSAGE_SELF, &resource_usage) == -1) {
 924                 g_error ("getrusage() failed, errno is %d (%s)\n", errno, strerror (errno));
 925                 return -1;
 926         }
 927
 928         current_time = mono_100ns_ticks ();
 929         kernel_time = resource_usage.ru_stime.tv_sec * 1000 * 1000 * 10 + resource_usage.ru_stime.tv_usec * 10;
 930         user_time = resource_usage.ru_utime.tv_sec * 1000 * 1000 * 10 + resource_usage.ru_utime.tv_usec * 10;
 931
 932         cpu_busy_time = (user_time - (prev ? prev->user_time : 0)) + (kernel_time - (prev ? prev->kernel_time : 0));
 933         cpu_total_time = (current_time - (prev ? prev->current_time : 0)) * mono_cpu_count ();
 934
 935         if (prev) {
 936                 prev->kernel_time = kernel_time;
 937                 prev->user_time = user_time;
 938                 prev->current_time = current_time;
 939         }
 940
 941         if (cpu_total_time > 0 && cpu_busy_time > 0)
 942                 cpu_usage = (gint32)(cpu_busy_time * 100 / cpu_total_time);
 943
 944         return cpu_usage;
 945 }
 946 #endif /* !HOST_WIN32 */