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-rw-r--r--src/basic/process-util.c860
1 files changed, 0 insertions, 860 deletions
diff --git a/src/basic/process-util.c b/src/basic/process-util.c
deleted file mode 100644
index 54b644ad56..0000000000
--- a/src/basic/process-util.c
+++ /dev/null
@@ -1,860 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <ctype.h>
-#include <errno.h>
-#include <limits.h>
-#include <linux/oom.h>
-#include <sched.h>
-#include <signal.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/personality.h>
-#include <sys/prctl.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <syslog.h>
-#include <unistd.h>
-#ifdef HAVE_VALGRIND_VALGRIND_H
-#include <valgrind/valgrind.h>
-#endif
-
-#include "alloc-util.h"
-#include "architecture.h"
-#include "escape.h"
-#include "fd-util.h"
-#include "fileio.h"
-#include "fs-util.h"
-#include "ioprio.h"
-#include "log.h"
-#include "macro.h"
-#include "missing.h"
-#include "process-util.h"
-#include "raw-clone.h"
-#include "signal-util.h"
-#include "stat-util.h"
-#include "string-table.h"
-#include "string-util.h"
-#include "user-util.h"
-#include "util.h"
-
-int get_process_state(pid_t pid) {
- const char *p;
- char state;
- int r;
- _cleanup_free_ char *line = NULL;
-
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "stat");
-
- r = read_one_line_file(p, &line);
- if (r == -ENOENT)
- return -ESRCH;
- if (r < 0)
- return r;
-
- p = strrchr(line, ')');
- if (!p)
- return -EIO;
-
- p++;
-
- if (sscanf(p, " %c", &state) != 1)
- return -EIO;
-
- return (unsigned char) state;
-}
-
-int get_process_comm(pid_t pid, char **name) {
- const char *p;
- int r;
-
- assert(name);
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "comm");
-
- r = read_one_line_file(p, name);
- if (r == -ENOENT)
- return -ESRCH;
-
- return r;
-}
-
-int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
- _cleanup_fclose_ FILE *f = NULL;
- bool space = false;
- char *r = NULL, *k;
- const char *p;
- int c;
-
- assert(line);
- assert(pid >= 0);
-
- /* Retrieves a process' command line. Replaces unprintable characters while doing so by whitespace (coalescing
- * multiple sequential ones into one). If max_length is != 0 will return a string of the specified size at most
- * (the trailing NUL byte does count towards the length here!), abbreviated with a "..." ellipsis. If
- * comm_fallback is true and the process has no command line set (the case for kernel threads), or has a
- * command line that resolves to the empty string will return the "comm" name of the process instead.
- *
- * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and
- * comm_fallback is false). */
-
- p = procfs_file_alloca(pid, "cmdline");
-
- f = fopen(p, "re");
- if (!f) {
- if (errno == ENOENT)
- return -ESRCH;
- return -errno;
- }
-
- if (max_length == 1) {
-
- /* If there's only room for one byte, return the empty string */
- r = new0(char, 1);
- if (!r)
- return -ENOMEM;
-
- *line = r;
- return 0;
-
- } else if (max_length == 0) {
- size_t len = 0, allocated = 0;
-
- while ((c = getc(f)) != EOF) {
-
- if (!GREEDY_REALLOC(r, allocated, len+3)) {
- free(r);
- return -ENOMEM;
- }
-
- if (isprint(c)) {
- if (space) {
- r[len++] = ' ';
- space = false;
- }
-
- r[len++] = c;
- } else if (len > 0)
- space = true;
- }
-
- if (len > 0)
- r[len] = 0;
- else
- r = mfree(r);
-
- } else {
- bool dotdotdot = false;
- size_t left;
-
- r = new(char, max_length);
- if (!r)
- return -ENOMEM;
-
- k = r;
- left = max_length;
- while ((c = getc(f)) != EOF) {
-
- if (isprint(c)) {
-
- if (space) {
- if (left <= 2) {
- dotdotdot = true;
- break;
- }
-
- *(k++) = ' ';
- left--;
- space = false;
- }
-
- if (left <= 1) {
- dotdotdot = true;
- break;
- }
-
- *(k++) = (char) c;
- left--;
- } else if (k > r)
- space = true;
- }
-
- if (dotdotdot) {
- if (max_length <= 4) {
- k = r;
- left = max_length;
- } else {
- k = r + max_length - 4;
- left = 4;
-
- /* Eat up final spaces */
- while (k > r && isspace(k[-1])) {
- k--;
- left++;
- }
- }
-
- strncpy(k, "...", left-1);
- k[left-1] = 0;
- } else
- *k = 0;
- }
-
- /* Kernel threads have no argv[] */
- if (isempty(r)) {
- _cleanup_free_ char *t = NULL;
- int h;
-
- free(r);
-
- if (!comm_fallback)
- return -ENOENT;
-
- h = get_process_comm(pid, &t);
- if (h < 0)
- return h;
-
- if (max_length == 0)
- r = strjoin("[", t, "]", NULL);
- else {
- size_t l;
-
- l = strlen(t);
-
- if (l + 3 <= max_length)
- r = strjoin("[", t, "]", NULL);
- else if (max_length <= 6) {
-
- r = new(char, max_length);
- if (!r)
- return -ENOMEM;
-
- memcpy(r, "[...]", max_length-1);
- r[max_length-1] = 0;
- } else {
- char *e;
-
- t[max_length - 6] = 0;
-
- /* Chop off final spaces */
- e = strchr(t, 0);
- while (e > t && isspace(e[-1]))
- e--;
- *e = 0;
-
- r = strjoin("[", t, "...]", NULL);
- }
- }
- if (!r)
- return -ENOMEM;
- }
-
- *line = r;
- return 0;
-}
-
-void rename_process(const char name[8]) {
- assert(name);
-
- /* This is a like a poor man's setproctitle(). It changes the
- * comm field, argv[0], and also the glibc's internally used
- * name of the process. For the first one a limit of 16 chars
- * applies, to the second one usually one of 10 (i.e. length
- * of "/sbin/init"), to the third one one of 7 (i.e. length of
- * "systemd"). If you pass a longer string it will be
- * truncated */
-
- (void) prctl(PR_SET_NAME, name);
-
- if (program_invocation_name)
- strncpy(program_invocation_name, name, strlen(program_invocation_name));
-
- if (saved_argc > 0) {
- int i;
-
- if (saved_argv[0])
- strncpy(saved_argv[0], name, strlen(saved_argv[0]));
-
- for (i = 1; i < saved_argc; i++) {
- if (!saved_argv[i])
- break;
-
- memzero(saved_argv[i], strlen(saved_argv[i]));
- }
- }
-}
-
-int is_kernel_thread(pid_t pid) {
- const char *p;
- size_t count;
- char c;
- bool eof;
- FILE *f;
-
- if (pid == 0 || pid == 1) /* pid 1, and we ourselves certainly aren't a kernel thread */
- return 0;
-
- assert(pid > 1);
-
- p = procfs_file_alloca(pid, "cmdline");
- f = fopen(p, "re");
- if (!f) {
- if (errno == ENOENT)
- return -ESRCH;
- return -errno;
- }
-
- count = fread(&c, 1, 1, f);
- eof = feof(f);
- fclose(f);
-
- /* Kernel threads have an empty cmdline */
-
- if (count <= 0)
- return eof ? 1 : -errno;
-
- return 0;
-}
-
-int get_process_capeff(pid_t pid, char **capeff) {
- const char *p;
- int r;
-
- assert(capeff);
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "status");
-
- r = get_proc_field(p, "CapEff", WHITESPACE, capeff);
- if (r == -ENOENT)
- return -ESRCH;
-
- return r;
-}
-
-static int get_process_link_contents(const char *proc_file, char **name) {
- int r;
-
- assert(proc_file);
- assert(name);
-
- r = readlink_malloc(proc_file, name);
- if (r == -ENOENT)
- return -ESRCH;
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int get_process_exe(pid_t pid, char **name) {
- const char *p;
- char *d;
- int r;
-
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "exe");
- r = get_process_link_contents(p, name);
- if (r < 0)
- return r;
-
- d = endswith(*name, " (deleted)");
- if (d)
- *d = '\0';
-
- return 0;
-}
-
-static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
- _cleanup_fclose_ FILE *f = NULL;
- char line[LINE_MAX];
- const char *p;
-
- assert(field);
- assert(uid);
-
- p = procfs_file_alloca(pid, "status");
- f = fopen(p, "re");
- if (!f) {
- if (errno == ENOENT)
- return -ESRCH;
- return -errno;
- }
-
- FOREACH_LINE(line, f, return -errno) {
- char *l;
-
- l = strstrip(line);
-
- if (startswith(l, field)) {
- l += strlen(field);
- l += strspn(l, WHITESPACE);
-
- l[strcspn(l, WHITESPACE)] = 0;
-
- return parse_uid(l, uid);
- }
- }
-
- return -EIO;
-}
-
-int get_process_uid(pid_t pid, uid_t *uid) {
- return get_process_id(pid, "Uid:", uid);
-}
-
-int get_process_gid(pid_t pid, gid_t *gid) {
- assert_cc(sizeof(uid_t) == sizeof(gid_t));
- return get_process_id(pid, "Gid:", gid);
-}
-
-int get_process_cwd(pid_t pid, char **cwd) {
- const char *p;
-
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "cwd");
-
- return get_process_link_contents(p, cwd);
-}
-
-int get_process_root(pid_t pid, char **root) {
- const char *p;
-
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "root");
-
- return get_process_link_contents(p, root);
-}
-
-int get_process_environ(pid_t pid, char **env) {
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ char *outcome = NULL;
- int c;
- const char *p;
- size_t allocated = 0, sz = 0;
-
- assert(pid >= 0);
- assert(env);
-
- p = procfs_file_alloca(pid, "environ");
-
- f = fopen(p, "re");
- if (!f) {
- if (errno == ENOENT)
- return -ESRCH;
- return -errno;
- }
-
- while ((c = fgetc(f)) != EOF) {
- if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
- return -ENOMEM;
-
- if (c == '\0')
- outcome[sz++] = '\n';
- else
- sz += cescape_char(c, outcome + sz);
- }
-
- if (!outcome) {
- outcome = strdup("");
- if (!outcome)
- return -ENOMEM;
- } else
- outcome[sz] = '\0';
-
- *env = outcome;
- outcome = NULL;
-
- return 0;
-}
-
-int get_process_ppid(pid_t pid, pid_t *_ppid) {
- int r;
- _cleanup_free_ char *line = NULL;
- long unsigned ppid;
- const char *p;
-
- assert(pid >= 0);
- assert(_ppid);
-
- if (pid == 0) {
- *_ppid = getppid();
- return 0;
- }
-
- p = procfs_file_alloca(pid, "stat");
- r = read_one_line_file(p, &line);
- if (r == -ENOENT)
- return -ESRCH;
- if (r < 0)
- return r;
-
- /* Let's skip the pid and comm fields. The latter is enclosed
- * in () but does not escape any () in its value, so let's
- * skip over it manually */
-
- p = strrchr(line, ')');
- if (!p)
- return -EIO;
-
- p++;
-
- if (sscanf(p, " "
- "%*c " /* state */
- "%lu ", /* ppid */
- &ppid) != 1)
- return -EIO;
-
- if ((long unsigned) (pid_t) ppid != ppid)
- return -ERANGE;
-
- *_ppid = (pid_t) ppid;
-
- return 0;
-}
-
-int wait_for_terminate(pid_t pid, siginfo_t *status) {
- siginfo_t dummy;
-
- assert(pid >= 1);
-
- if (!status)
- status = &dummy;
-
- for (;;) {
- zero(*status);
-
- if (waitid(P_PID, pid, status, WEXITED) < 0) {
-
- if (errno == EINTR)
- continue;
-
- return negative_errno();
- }
-
- return 0;
- }
-}
-
-/*
- * Return values:
- * < 0 : wait_for_terminate() failed to get the state of the
- * process, the process was terminated by a signal, or
- * failed for an unknown reason.
- * >=0 : The process terminated normally, and its exit code is
- * returned.
- *
- * That is, success is indicated by a return value of zero, and an
- * error is indicated by a non-zero value.
- *
- * A warning is emitted if the process terminates abnormally,
- * and also if it returns non-zero unless check_exit_code is true.
- */
-int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
- int r;
- siginfo_t status;
-
- assert(name);
- assert(pid > 1);
-
- r = wait_for_terminate(pid, &status);
- if (r < 0)
- return log_warning_errno(r, "Failed to wait for %s: %m", name);
-
- if (status.si_code == CLD_EXITED) {
- if (status.si_status != 0)
- log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
- "%s failed with error code %i.", name, status.si_status);
- else
- log_debug("%s succeeded.", name);
-
- return status.si_status;
- } else if (status.si_code == CLD_KILLED ||
- status.si_code == CLD_DUMPED) {
-
- log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
- return -EPROTO;
- }
-
- log_warning("%s failed due to unknown reason.", name);
- return -EPROTO;
-}
-
-void sigkill_wait(pid_t pid) {
- assert(pid > 1);
-
- if (kill(pid, SIGKILL) > 0)
- (void) wait_for_terminate(pid, NULL);
-}
-
-void sigkill_waitp(pid_t *pid) {
- if (!pid)
- return;
- if (*pid <= 1)
- return;
-
- sigkill_wait(*pid);
-}
-
-int kill_and_sigcont(pid_t pid, int sig) {
- int r;
-
- r = kill(pid, sig) < 0 ? -errno : 0;
-
- /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't
- * affected by a process being suspended anyway. */
- if (r >= 0 && !IN_SET(SIGCONT, SIGKILL))
- (void) kill(pid, SIGCONT);
-
- return r;
-}
-
-int getenv_for_pid(pid_t pid, const char *field, char **_value) {
- _cleanup_fclose_ FILE *f = NULL;
- char *value = NULL;
- int r;
- bool done = false;
- size_t l;
- const char *path;
-
- assert(pid >= 0);
- assert(field);
- assert(_value);
-
- path = procfs_file_alloca(pid, "environ");
-
- f = fopen(path, "re");
- if (!f) {
- if (errno == ENOENT)
- return -ESRCH;
- return -errno;
- }
-
- l = strlen(field);
- r = 0;
-
- do {
- char line[LINE_MAX];
- unsigned i;
-
- for (i = 0; i < sizeof(line)-1; i++) {
- int c;
-
- c = getc(f);
- if (_unlikely_(c == EOF)) {
- done = true;
- break;
- } else if (c == 0)
- break;
-
- line[i] = c;
- }
- line[i] = 0;
-
- if (memcmp(line, field, l) == 0 && line[l] == '=') {
- value = strdup(line + l + 1);
- if (!value)
- return -ENOMEM;
-
- r = 1;
- break;
- }
-
- } while (!done);
-
- *_value = value;
- return r;
-}
-
-bool pid_is_unwaited(pid_t pid) {
- /* Checks whether a PID is still valid at all, including a zombie */
-
- if (pid < 0)
- return false;
-
- if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */
- return true;
-
- if (kill(pid, 0) >= 0)
- return true;
-
- return errno != ESRCH;
-}
-
-bool pid_is_alive(pid_t pid) {
- int r;
-
- /* Checks whether a PID is still valid and not a zombie */
-
- if (pid < 0)
- return false;
-
- if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */
- return true;
-
- r = get_process_state(pid);
- if (r == -ESRCH || r == 'Z')
- return false;
-
- return true;
-}
-
-int pid_from_same_root_fs(pid_t pid) {
- const char *root;
-
- if (pid < 0)
- return 0;
-
- root = procfs_file_alloca(pid, "root");
-
- return files_same(root, "/proc/1/root");
-}
-
-bool is_main_thread(void) {
- static thread_local int cached = 0;
-
- if (_unlikely_(cached == 0))
- cached = getpid() == gettid() ? 1 : -1;
-
- return cached > 0;
-}
-
-noreturn void freeze(void) {
-
- log_close();
-
- /* Make sure nobody waits for us on a socket anymore */
- close_all_fds(NULL, 0);
-
- sync();
-
- for (;;)
- pause();
-}
-
-bool oom_score_adjust_is_valid(int oa) {
- return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
-}
-
-unsigned long personality_from_string(const char *p) {
- int architecture;
-
- if (!p)
- return PERSONALITY_INVALID;
-
- /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just
- * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for
- * the same register size. */
-
- architecture = architecture_from_string(p);
- if (architecture < 0)
- return PERSONALITY_INVALID;
-
- if (architecture == native_architecture())
- return PER_LINUX;
-#ifdef SECONDARY_ARCHITECTURE
- if (architecture == SECONDARY_ARCHITECTURE)
- return PER_LINUX32;
-#endif
-
- return PERSONALITY_INVALID;
-}
-
-const char* personality_to_string(unsigned long p) {
- int architecture = _ARCHITECTURE_INVALID;
-
- if (p == PER_LINUX)
- architecture = native_architecture();
-#ifdef SECONDARY_ARCHITECTURE
- else if (p == PER_LINUX32)
- architecture = SECONDARY_ARCHITECTURE;
-#endif
-
- if (architecture < 0)
- return NULL;
-
- return architecture_to_string(architecture);
-}
-
-void valgrind_summary_hack(void) {
-#ifdef HAVE_VALGRIND_VALGRIND_H
- if (getpid() == 1 && RUNNING_ON_VALGRIND) {
- pid_t pid;
- pid = raw_clone(SIGCHLD);
- if (pid < 0)
- log_emergency_errno(errno, "Failed to fork off valgrind helper: %m");
- else if (pid == 0)
- exit(EXIT_SUCCESS);
- else {
- log_info("Spawned valgrind helper as PID "PID_FMT".", pid);
- (void) wait_for_terminate(pid, NULL);
- }
- }
-#endif
-}
-
-int pid_compare_func(const void *a, const void *b) {
- const pid_t *p = a, *q = b;
-
- /* Suitable for usage in qsort() */
-
- if (*p < *q)
- return -1;
- if (*p > *q)
- return 1;
- return 0;
-}
-
-static const char *const ioprio_class_table[] = {
- [IOPRIO_CLASS_NONE] = "none",
- [IOPRIO_CLASS_RT] = "realtime",
- [IOPRIO_CLASS_BE] = "best-effort",
- [IOPRIO_CLASS_IDLE] = "idle"
-};
-
-DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
-
-static const char *const sigchld_code_table[] = {
- [CLD_EXITED] = "exited",
- [CLD_KILLED] = "killed",
- [CLD_DUMPED] = "dumped",
- [CLD_TRAPPED] = "trapped",
- [CLD_STOPPED] = "stopped",
- [CLD_CONTINUED] = "continued",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
-
-static const char* const sched_policy_table[] = {
- [SCHED_OTHER] = "other",
- [SCHED_BATCH] = "batch",
- [SCHED_IDLE] = "idle",
- [SCHED_FIFO] = "fifo",
- [SCHED_RR] = "rr"
-};
-
-DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 10:39:04 +0000