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 p = procfs_file_alloca(pid, "cmdline");
121 if (max_length == 0) {
122 size_t len = 0, allocated = 0;
124 while ((c = getc(f)) != EOF) {
126 if (!GREEDY_REALLOC(r, allocated, len+2)) {
148 r = new(char, max_length);
154 while ((c = getc(f)) != EOF) {
176 size_t n = MIN(left-1, 3U);
183 /* Kernel threads have no argv[] */
185 _cleanup_free_ char *t = NULL;
193 h = get_process_comm(pid, &t);
197 r = strjoin("[", t, "]", NULL);
206 #if 0 /// UNNEEDED by elogind
207 void rename_process(const char name[8]) {
210 /* This is a like a poor man's setproctitle(). It changes the
211 * comm field, argv[0], and also the glibc's internally used
212 * name of the process. For the first one a limit of 16 chars
213 * applies, to the second one usually one of 10 (i.e. length
214 * of "/sbin/init"), to the third one one of 7 (i.e. length of
215 * "systemd"). If you pass a longer string it will be
218 (void) prctl(PR_SET_NAME, name);
220 if (program_invocation_name)
221 strncpy(program_invocation_name, name, strlen(program_invocation_name));
223 if (saved_argc > 0) {
227 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
229 for (i = 1; i < saved_argc; i++) {
233 memzero(saved_argv[i], strlen(saved_argv[i]));
239 int is_kernel_thread(pid_t pid) {
246 if (pid == 0 || pid == 1) /* pid 1, and we ourselves certainly aren't a kernel thread */
251 p = procfs_file_alloca(pid, "cmdline");
259 count = fread(&c, 1, 1, f);
263 /* Kernel threads have an empty cmdline */
266 return eof ? 1 : -errno;
271 #if 0 /// UNNEEDED by elogind
272 int get_process_capeff(pid_t pid, char **capeff) {
279 p = procfs_file_alloca(pid, "status");
281 r = get_proc_field(p, "CapEff", WHITESPACE, capeff);
289 static int get_process_link_contents(const char *proc_file, char **name) {
295 r = readlink_malloc(proc_file, name);
304 int get_process_exe(pid_t pid, char **name) {
311 p = procfs_file_alloca(pid, "exe");
312 r = get_process_link_contents(p, name);
316 d = endswith(*name, " (deleted)");
323 #if 0 /// UNNEEDED by elogind
324 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
325 _cleanup_fclose_ FILE *f = NULL;
332 p = procfs_file_alloca(pid, "status");
340 FOREACH_LINE(line, f, return -errno) {
345 if (startswith(l, field)) {
347 l += strspn(l, WHITESPACE);
349 l[strcspn(l, WHITESPACE)] = 0;
351 return parse_uid(l, uid);
358 int get_process_uid(pid_t pid, uid_t *uid) {
359 return get_process_id(pid, "Uid:", uid);
362 int get_process_gid(pid_t pid, gid_t *gid) {
363 assert_cc(sizeof(uid_t) == sizeof(gid_t));
364 return get_process_id(pid, "Gid:", gid);
367 int get_process_cwd(pid_t pid, char **cwd) {
372 p = procfs_file_alloca(pid, "cwd");
374 return get_process_link_contents(p, cwd);
377 int get_process_root(pid_t pid, char **root) {
382 p = procfs_file_alloca(pid, "root");
384 return get_process_link_contents(p, root);
387 int get_process_environ(pid_t pid, char **env) {
388 _cleanup_fclose_ FILE *f = NULL;
389 _cleanup_free_ char *outcome = NULL;
392 size_t allocated = 0, sz = 0;
397 p = procfs_file_alloca(pid, "environ");
406 while ((c = fgetc(f)) != EOF) {
407 if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
411 outcome[sz++] = '\n';
413 sz += cescape_char(c, outcome + sz);
417 outcome = strdup("");
429 int get_process_ppid(pid_t pid, pid_t *_ppid) {
431 _cleanup_free_ char *line = NULL;
443 p = procfs_file_alloca(pid, "stat");
444 r = read_one_line_file(p, &line);
450 /* Let's skip the pid and comm fields. The latter is enclosed
451 * in () but does not escape any () in its value, so let's
452 * skip over it manually */
454 p = strrchr(line, ')');
466 if ((long unsigned) (pid_t) ppid != ppid)
469 *_ppid = (pid_t) ppid;
475 int wait_for_terminate(pid_t pid, siginfo_t *status) {
486 if (waitid(P_PID, pid, status, WEXITED) < 0) {
500 * < 0 : wait_for_terminate() failed to get the state of the
501 * process, the process was terminated by a signal, or
502 * failed for an unknown reason.
503 * >=0 : The process terminated normally, and its exit code is
506 * That is, success is indicated by a return value of zero, and an
507 * error is indicated by a non-zero value.
509 * A warning is emitted if the process terminates abnormally,
510 * and also if it returns non-zero unless check_exit_code is true.
512 int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
519 r = wait_for_terminate(pid, &status);
521 return log_warning_errno(r, "Failed to wait for %s: %m", name);
523 if (status.si_code == CLD_EXITED) {
524 if (status.si_status != 0)
525 log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
526 "%s failed with error code %i.", name, status.si_status);
528 log_debug("%s succeeded.", name);
530 return status.si_status;
531 } else if (status.si_code == CLD_KILLED ||
532 status.si_code == CLD_DUMPED) {
534 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
538 log_warning("%s failed due to unknown reason.", name);
542 #if 0 /// UNNEEDED by elogind
543 void sigkill_wait(pid_t pid) {
546 if (kill(pid, SIGKILL) > 0)
547 (void) wait_for_terminate(pid, NULL);
550 void sigkill_waitp(pid_t *pid) {
559 int kill_and_sigcont(pid_t pid, int sig) {
562 r = kill(pid, sig) < 0 ? -errno : 0;
571 int getenv_for_pid(pid_t pid, const char *field, char **_value) {
572 _cleanup_fclose_ FILE *f = NULL;
583 path = procfs_file_alloca(pid, "environ");
585 f = fopen(path, "re");
599 for (i = 0; i < sizeof(line)-1; i++) {
603 if (_unlikely_(c == EOF)) {
613 if (memcmp(line, field, l) == 0 && line[l] == '=') {
614 value = strdup(line + l + 1);
628 bool pid_is_unwaited(pid_t pid) {
629 /* Checks whether a PID is still valid at all, including a zombie */
634 if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */
637 if (kill(pid, 0) >= 0)
640 return errno != ESRCH;
643 bool pid_is_alive(pid_t pid) {
646 /* Checks whether a PID is still valid and not a zombie */
651 if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */
654 r = get_process_state(pid);
655 if (r == -ESRCH || r == 'Z')
661 #if 0 /// UNNEEDED by elogind
662 int pid_from_same_root_fs(pid_t pid) {
668 root = procfs_file_alloca(pid, "root");
670 return files_same(root, "/proc/1/root");
674 bool is_main_thread(void) {
675 static thread_local int cached = 0;
677 if (_unlikely_(cached == 0))
678 cached = getpid() == gettid() ? 1 : -1;
683 #if 0 /// UNNEEDED by elogind
684 noreturn void freeze(void) {
688 /* Make sure nobody waits for us on a socket anymore */
689 close_all_fds(NULL, 0);
697 bool oom_score_adjust_is_valid(int oa) {
698 return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
701 unsigned long personality_from_string(const char *p) {
705 return PERSONALITY_INVALID;
707 /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just
708 * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for
709 * the same register size. */
711 architecture = architecture_from_string(p);
712 if (architecture < 0)
713 return PERSONALITY_INVALID;
715 if (architecture == native_architecture())
717 #ifdef SECONDARY_ARCHITECTURE
718 if (architecture == SECONDARY_ARCHITECTURE)
722 return PERSONALITY_INVALID;
725 const char* personality_to_string(unsigned long p) {
726 int architecture = _ARCHITECTURE_INVALID;
729 architecture = native_architecture();
730 #ifdef SECONDARY_ARCHITECTURE
731 else if (p == PER_LINUX32)
732 architecture = SECONDARY_ARCHITECTURE;
735 if (architecture < 0)
738 return architecture_to_string(architecture);
741 void valgrind_summary_hack(void) {
742 #ifdef HAVE_VALGRIND_VALGRIND_H
743 if (getpid() == 1 && RUNNING_ON_VALGRIND) {
745 pid = raw_clone(SIGCHLD, NULL);
747 log_emergency_errno(errno, "Failed to fork off valgrind helper: %m");
751 log_info("Spawned valgrind helper as PID "PID_FMT".", pid);
752 (void) wait_for_terminate(pid, NULL);
758 int pid_compare_func(const void *a, const void *b) {
759 const pid_t *p = a, *q = b;
761 /* Suitable for usage in qsort() */
770 static const char *const ioprio_class_table[] = {
771 [IOPRIO_CLASS_NONE] = "none",
772 [IOPRIO_CLASS_RT] = "realtime",
773 [IOPRIO_CLASS_BE] = "best-effort",
774 [IOPRIO_CLASS_IDLE] = "idle"
777 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
779 static const char *const sigchld_code_table[] = {
780 [CLD_EXITED] = "exited",
781 [CLD_KILLED] = "killed",
782 [CLD_DUMPED] = "dumped",
783 [CLD_TRAPPED] = "trapped",
784 [CLD_STOPPED] = "stopped",
785 [CLD_CONTINUED] = "continued",
788 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
790 static const char* const sched_policy_table[] = {
791 [SCHED_OTHER] = "other",
792 [SCHED_BATCH] = "batch",
793 [SCHED_IDLE] = "idle",
794 [SCHED_FIFO] = "fifo",
798 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);