2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <linux/oom.h>
30 #include <sys/personality.h>
31 #include <sys/prctl.h>
32 #include <sys/types.h>
36 #ifdef HAVE_VALGRIND_VALGRIND_H
37 #include <valgrind/valgrind.h>
40 #include "alloc-util.h"
41 //#include "architecture.h"
50 #include "process-util.h"
51 #include "signal-util.h"
52 //#include "stat-util.h"
53 #include "string-table.h"
54 #include "string-util.h"
55 #include "user-util.h"
58 int get_process_state(pid_t pid) {
62 _cleanup_free_ char *line = NULL;
66 p = procfs_file_alloca(pid, "stat");
68 r = read_one_line_file(p, &line);
74 p = strrchr(line, ')');
80 if (sscanf(p, " %c", &state) != 1)
83 return (unsigned char) state;
86 int get_process_comm(pid_t pid, char **name) {
93 p = procfs_file_alloca(pid, "comm");
95 r = read_one_line_file(p, name);
102 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
103 _cleanup_fclose_ FILE *f = NULL;
112 /* Retrieves a process' command line. Replaces unprintable characters while doing so by whitespace (coalescing
113 * multiple sequential ones into one). If max_length is != 0 will return a string of the specified size at most
114 * (the trailing NUL byte does count towards the length here!), abbreviated with a "..." ellipsis. If
115 * comm_fallback is true and the process has no command line set (the case for kernel threads), or has a
116 * command line that resolves to the empty string will return the "comm" name of the process instead.
118 * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and
119 * comm_fallback is false). */
121 p = procfs_file_alloca(pid, "cmdline");
130 if (max_length == 1) {
132 /* If there's only room for one byte, return the empty string */
140 } else if (max_length == 0) {
141 size_t len = 0, allocated = 0;
143 while ((c = getc(f)) != EOF) {
145 if (!GREEDY_REALLOC(r, allocated, len+3)) {
167 bool dotdotdot = false;
170 r = new(char, max_length);
176 while ((c = getc(f)) != EOF) {
203 if (max_length <= 4) {
207 k = r + max_length - 4;
210 /* Eat up final spaces */
211 while (k > r && isspace(k[-1])) {
217 strncpy(k, "...", left-1);
223 /* Kernel threads have no argv[] */
225 _cleanup_free_ char *t = NULL;
233 h = get_process_comm(pid, &t);
238 r = strjoin("[", t, "]", NULL);
244 if (l + 3 <= max_length)
245 r = strjoin("[", t, "]", NULL);
246 else if (max_length <= 6) {
248 r = new(char, max_length);
252 memcpy(r, "[...]", max_length-1);
257 t[max_length - 6] = 0;
259 /* Chop off final spaces */
261 while (e > t && isspace(e[-1]))
265 r = strjoin("[", t, "...]", NULL);
276 #if 0 /// UNNEEDED by elogind
277 void rename_process(const char name[8]) {
280 /* This is a like a poor man's setproctitle(). It changes the
281 * comm field, argv[0], and also the glibc's internally used
282 * name of the process. For the first one a limit of 16 chars
283 * applies, to the second one usually one of 10 (i.e. length
284 * of "/sbin/init"), to the third one one of 7 (i.e. length of
285 * "systemd"). If you pass a longer string it will be
288 (void) prctl(PR_SET_NAME, name);
290 if (program_invocation_name)
291 strncpy(program_invocation_name, name, strlen(program_invocation_name));
293 if (saved_argc > 0) {
297 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
299 for (i = 1; i < saved_argc; i++) {
303 memzero(saved_argv[i], strlen(saved_argv[i]));
309 int is_kernel_thread(pid_t pid) {
316 if (pid == 0 || pid == 1) /* pid 1, and we ourselves certainly aren't a kernel thread */
321 p = procfs_file_alloca(pid, "cmdline");
329 count = fread(&c, 1, 1, f);
333 /* Kernel threads have an empty cmdline */
336 return eof ? 1 : -errno;
341 #if 0 /// UNNEEDED by elogind
342 int get_process_capeff(pid_t pid, char **capeff) {
349 p = procfs_file_alloca(pid, "status");
351 r = get_proc_field(p, "CapEff", WHITESPACE, capeff);
359 static int get_process_link_contents(const char *proc_file, char **name) {
365 r = readlink_malloc(proc_file, name);
374 int get_process_exe(pid_t pid, char **name) {
381 p = procfs_file_alloca(pid, "exe");
382 r = get_process_link_contents(p, name);
386 d = endswith(*name, " (deleted)");
393 #if 0 /// UNNEEDED by elogind
394 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
395 _cleanup_fclose_ FILE *f = NULL;
402 p = procfs_file_alloca(pid, "status");
410 FOREACH_LINE(line, f, return -errno) {
415 if (startswith(l, field)) {
417 l += strspn(l, WHITESPACE);
419 l[strcspn(l, WHITESPACE)] = 0;
421 return parse_uid(l, uid);
428 int get_process_uid(pid_t pid, uid_t *uid) {
429 return get_process_id(pid, "Uid:", uid);
432 int get_process_gid(pid_t pid, gid_t *gid) {
433 assert_cc(sizeof(uid_t) == sizeof(gid_t));
434 return get_process_id(pid, "Gid:", gid);
437 int get_process_cwd(pid_t pid, char **cwd) {
442 p = procfs_file_alloca(pid, "cwd");
444 return get_process_link_contents(p, cwd);
447 int get_process_root(pid_t pid, char **root) {
452 p = procfs_file_alloca(pid, "root");
454 return get_process_link_contents(p, root);
457 int get_process_environ(pid_t pid, char **env) {
458 _cleanup_fclose_ FILE *f = NULL;
459 _cleanup_free_ char *outcome = NULL;
462 size_t allocated = 0, sz = 0;
467 p = procfs_file_alloca(pid, "environ");
476 while ((c = fgetc(f)) != EOF) {
477 if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
481 outcome[sz++] = '\n';
483 sz += cescape_char(c, outcome + sz);
487 outcome = strdup("");
499 int get_process_ppid(pid_t pid, pid_t *_ppid) {
501 _cleanup_free_ char *line = NULL;
513 p = procfs_file_alloca(pid, "stat");
514 r = read_one_line_file(p, &line);
520 /* Let's skip the pid and comm fields. The latter is enclosed
521 * in () but does not escape any () in its value, so let's
522 * skip over it manually */
524 p = strrchr(line, ')');
536 if ((long unsigned) (pid_t) ppid != ppid)
539 *_ppid = (pid_t) ppid;
545 int wait_for_terminate(pid_t pid, siginfo_t *status) {
556 if (waitid(P_PID, pid, status, WEXITED) < 0) {
561 return negative_errno();
570 * < 0 : wait_for_terminate() failed to get the state of the
571 * process, the process was terminated by a signal, or
572 * failed for an unknown reason.
573 * >=0 : The process terminated normally, and its exit code is
576 * That is, success is indicated by a return value of zero, and an
577 * error is indicated by a non-zero value.
579 * A warning is emitted if the process terminates abnormally,
580 * and also if it returns non-zero unless check_exit_code is true.
582 int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
589 r = wait_for_terminate(pid, &status);
591 return log_warning_errno(r, "Failed to wait for %s: %m", name);
593 if (status.si_code == CLD_EXITED) {
594 if (status.si_status != 0)
595 log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
596 "%s failed with error code %i.", name, status.si_status);
598 log_debug("%s succeeded.", name);
600 return status.si_status;
601 } else if (status.si_code == CLD_KILLED ||
602 status.si_code == CLD_DUMPED) {
604 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
608 log_warning("%s failed due to unknown reason.", name);
612 #if 0 /// UNNEEDED by elogind
613 void sigkill_wait(pid_t pid) {
616 if (kill(pid, SIGKILL) > 0)
617 (void) wait_for_terminate(pid, NULL);
620 void sigkill_waitp(pid_t *pid) {
629 int kill_and_sigcont(pid_t pid, int sig) {
632 r = kill(pid, sig) < 0 ? -errno : 0;
634 /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't
635 * affected by a process being suspended anyway. */
636 if (r >= 0 && !IN_SET(SIGCONT, SIGKILL))
637 (void) kill(pid, SIGCONT);
643 int getenv_for_pid(pid_t pid, const char *field, char **_value) {
644 _cleanup_fclose_ FILE *f = NULL;
655 path = procfs_file_alloca(pid, "environ");
657 f = fopen(path, "re");
671 for (i = 0; i < sizeof(line)-1; i++) {
675 if (_unlikely_(c == EOF)) {
685 if (memcmp(line, field, l) == 0 && line[l] == '=') {
686 value = strdup(line + l + 1);
700 bool pid_is_unwaited(pid_t pid) {
701 /* Checks whether a PID is still valid at all, including a zombie */
706 if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */
709 if (kill(pid, 0) >= 0)
712 return errno != ESRCH;
715 bool pid_is_alive(pid_t pid) {
718 /* Checks whether a PID is still valid and not a zombie */
723 if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */
726 r = get_process_state(pid);
727 if (r == -ESRCH || r == 'Z')
733 #if 0 /// UNNEEDED by elogind
734 int pid_from_same_root_fs(pid_t pid) {
740 root = procfs_file_alloca(pid, "root");
742 return files_same(root, "/proc/1/root");
746 bool is_main_thread(void) {
747 static thread_local int cached = 0;
749 if (_unlikely_(cached == 0))
750 cached = getpid() == gettid() ? 1 : -1;
755 #if 0 /// UNNEEDED by elogind
756 noreturn void freeze(void) {
760 /* Make sure nobody waits for us on a socket anymore */
761 close_all_fds(NULL, 0);
769 bool oom_score_adjust_is_valid(int oa) {
770 return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
773 unsigned long personality_from_string(const char *p) {
777 return PERSONALITY_INVALID;
779 /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just
780 * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for
781 * the same register size. */
783 architecture = architecture_from_string(p);
784 if (architecture < 0)
785 return PERSONALITY_INVALID;
787 if (architecture == native_architecture())
789 #ifdef SECONDARY_ARCHITECTURE
790 if (architecture == SECONDARY_ARCHITECTURE)
794 return PERSONALITY_INVALID;
797 const char* personality_to_string(unsigned long p) {
798 int architecture = _ARCHITECTURE_INVALID;
801 architecture = native_architecture();
802 #ifdef SECONDARY_ARCHITECTURE
803 else if (p == PER_LINUX32)
804 architecture = SECONDARY_ARCHITECTURE;
807 if (architecture < 0)
810 return architecture_to_string(architecture);
813 void valgrind_summary_hack(void) {
814 #ifdef HAVE_VALGRIND_VALGRIND_H
815 if (getpid() == 1 && RUNNING_ON_VALGRIND) {
817 pid = raw_clone(SIGCHLD);
819 log_emergency_errno(errno, "Failed to fork off valgrind helper: %m");
823 log_info("Spawned valgrind helper as PID "PID_FMT".", pid);
824 (void) wait_for_terminate(pid, NULL);
830 int pid_compare_func(const void *a, const void *b) {
831 const pid_t *p = a, *q = b;
833 /* Suitable for usage in qsort() */
842 static const char *const ioprio_class_table[] = {
843 [IOPRIO_CLASS_NONE] = "none",
844 [IOPRIO_CLASS_RT] = "realtime",
845 [IOPRIO_CLASS_BE] = "best-effort",
846 [IOPRIO_CLASS_IDLE] = "idle"
849 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
851 static const char *const sigchld_code_table[] = {
852 [CLD_EXITED] = "exited",
853 [CLD_KILLED] = "killed",
854 [CLD_DUMPED] = "dumped",
855 [CLD_TRAPPED] = "trapped",
856 [CLD_STOPPED] = "stopped",
857 [CLD_CONTINUED] = "continued",
860 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
862 static const char* const sched_policy_table[] = {
863 [SCHED_OTHER] = "other",
864 [SCHED_BATCH] = "batch",
865 [SCHED_IDLE] = "idle",
866 [SCHED_FIFO] = "fifo",
870 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);