| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <limits.h> |
| #include <linux/oom.h> |
| #include <pthread.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mount.h> |
| #include <sys/personality.h> |
| #include <sys/prctl.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| #if HAVE_VALGRIND_VALGRIND_H |
| #include <valgrind/valgrind.h> |
| #endif |
| |
| #include "alloc-util.h" |
| #include "architecture.h" |
| #include "argv-util.h" |
| #include "env-file.h" |
| #include "env-util.h" |
| #include "errno-util.h" |
| #include "escape.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fs-util.h" |
| #include "hostname-util.h" |
| #include "locale-util.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "memory-util.h" |
| #include "missing_sched.h" |
| #include "missing_syscall.h" |
| #include "missing_threads.h" |
| #include "mountpoint-util.h" |
| #include "namespace-util.h" |
| #include "nulstr-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "process-util.h" |
| #include "raw-clone.h" |
| #include "rlimit-util.h" |
| #include "signal-util.h" |
| #include "stat-util.h" |
| #include "stdio-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "terminal-util.h" |
| #include "user-util.h" |
| #include "utf8.h" |
| |
| /* The kernel limits userspace processes to TASK_COMM_LEN (16 bytes), but allows higher values for its own |
| * workers, e.g. "kworker/u9:3-kcryptd/253:0". Let's pick a fixed smallish limit that will work for the kernel. |
| */ |
| #define COMM_MAX_LEN 128 |
| |
| static int get_process_state(pid_t pid) { |
| _cleanup_free_ char *line = NULL; |
| const char *p; |
| char state; |
| int r; |
| |
| assert(pid >= 0); |
| |
| /* Shortcut: if we are enquired about our own state, we are obviously running */ |
| if (pid == 0 || pid == getpid_cached()) |
| return (unsigned char) 'R'; |
| |
| 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 **ret) { |
| _cleanup_free_ char *escaped = NULL, *comm = NULL; |
| int r; |
| |
| assert(ret); |
| assert(pid >= 0); |
| |
| if (pid == 0 || pid == getpid_cached()) { |
| comm = new0(char, TASK_COMM_LEN + 1); /* Must fit in 16 byte according to prctl(2) */ |
| if (!comm) |
| return -ENOMEM; |
| |
| if (prctl(PR_GET_NAME, comm) < 0) |
| return -errno; |
| } else { |
| const char *p; |
| |
| p = procfs_file_alloca(pid, "comm"); |
| |
| /* Note that process names of kernel threads can be much longer than TASK_COMM_LEN */ |
| r = read_one_line_file(p, &comm); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| } |
| |
| escaped = new(char, COMM_MAX_LEN); |
| if (!escaped) |
| return -ENOMEM; |
| |
| /* Escape unprintable characters, just in case, but don't grow the string beyond the underlying size */ |
| cellescape(escaped, COMM_MAX_LEN, comm); |
| |
| *ret = TAKE_PTR(escaped); |
| return 0; |
| } |
| |
| static int get_process_cmdline_nulstr( |
| pid_t pid, |
| size_t max_size, |
| ProcessCmdlineFlags flags, |
| char **ret, |
| size_t *ret_size) { |
| |
| const char *p; |
| char *t; |
| size_t k; |
| int r; |
| |
| /* Retrieves a process' command line as a "sized nulstr", i.e. possibly without the last NUL, but |
| * with a specified size. |
| * |
| * If PROCESS_CMDLINE_COMM_FALLBACK is specified in flags 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. This will use at most _SC_ARG_MAX bytes of input |
| * data. |
| * |
| * Returns an error, 0 if output was read but is truncated, 1 otherwise. |
| */ |
| |
| p = procfs_file_alloca(pid, "cmdline"); |
| r = read_virtual_file(p, max_size, &t, &k); /* Let's assume that each input byte results in >= 1 |
| * columns of output. We ignore zero-width codepoints. */ |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| if (k == 0) { |
| t = mfree(t); |
| |
| if (!(flags & PROCESS_CMDLINE_COMM_FALLBACK)) |
| return -ENOENT; |
| |
| /* Kernel threads have no argv[] */ |
| _cleanup_free_ char *comm = NULL; |
| |
| r = get_process_comm(pid, &comm); |
| if (r < 0) |
| return r; |
| |
| t = strjoin("[", comm, "]"); |
| if (!t) |
| return -ENOMEM; |
| |
| k = strlen(t); |
| r = k <= max_size; |
| if (r == 0) /* truncation */ |
| t[max_size] = '\0'; |
| } |
| |
| *ret = t; |
| *ret_size = k; |
| return r; |
| } |
| |
| int get_process_cmdline(pid_t pid, size_t max_columns, ProcessCmdlineFlags flags, char **ret) { |
| _cleanup_free_ char *t = NULL; |
| size_t k; |
| char *ans; |
| |
| assert(pid >= 0); |
| assert(ret); |
| |
| /* Retrieve and format a commandline. See above for discussion of retrieval options. |
| * |
| * There are two main formatting modes: |
| * |
| * - when PROCESS_CMDLINE_QUOTE is specified, output is quoted in C/Python style. If no shell special |
| * characters are present, this output can be copy-pasted into the terminal to execute. UTF-8 |
| * output is assumed. |
| * |
| * - otherwise, a compact non-roundtrippable form is returned. Non-UTF8 bytes are replaced by �. The |
| * returned string is of the specified console width at most, abbreviated with an ellipsis. |
| * |
| * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and |
| * PROCESS_CMDLINE_COMM_FALLBACK is not specified). Returns 0 and sets *line otherwise. */ |
| |
| int full = get_process_cmdline_nulstr(pid, max_columns, flags, &t, &k); |
| if (full < 0) |
| return full; |
| |
| if (flags & (PROCESS_CMDLINE_QUOTE | PROCESS_CMDLINE_QUOTE_POSIX)) { |
| ShellEscapeFlags shflags = SHELL_ESCAPE_EMPTY | |
| FLAGS_SET(flags, PROCESS_CMDLINE_QUOTE_POSIX) * SHELL_ESCAPE_POSIX; |
| |
| assert(!(flags & PROCESS_CMDLINE_USE_LOCALE)); |
| |
| _cleanup_strv_free_ char **args = NULL; |
| |
| args = strv_parse_nulstr(t, k); |
| if (!args) |
| return -ENOMEM; |
| |
| /* Drop trailing empty strings. See issue #21186. */ |
| STRV_FOREACH_BACKWARDS(p, args) { |
| if (!isempty(*p)) |
| break; |
| |
| *p = mfree(*p); |
| } |
| |
| ans = quote_command_line(args, shflags); |
| if (!ans) |
| return -ENOMEM; |
| } else { |
| /* Arguments are separated by NULs. Let's replace those with spaces. */ |
| for (size_t i = 0; i < k - 1; i++) |
| if (t[i] == '\0') |
| t[i] = ' '; |
| |
| delete_trailing_chars(t, WHITESPACE); |
| |
| bool eight_bit = (flags & PROCESS_CMDLINE_USE_LOCALE) && !is_locale_utf8(); |
| |
| ans = escape_non_printable_full(t, max_columns, |
| eight_bit * XESCAPE_8_BIT | !full * XESCAPE_FORCE_ELLIPSIS); |
| if (!ans) |
| return -ENOMEM; |
| |
| ans = str_realloc(ans); |
| } |
| |
| *ret = ans; |
| return 0; |
| } |
| |
| int container_get_leader(const char *machine, pid_t *pid) { |
| _cleanup_free_ char *s = NULL, *class = NULL; |
| const char *p; |
| pid_t leader; |
| int r; |
| |
| assert(machine); |
| assert(pid); |
| |
| if (streq(machine, ".host")) { |
| *pid = 1; |
| return 0; |
| } |
| |
| if (!hostname_is_valid(machine, 0)) |
| return -EINVAL; |
| |
| p = strjoina("/run/systemd/machines/", machine); |
| r = parse_env_file(NULL, p, |
| "LEADER", &s, |
| "CLASS", &class); |
| if (r == -ENOENT) |
| return -EHOSTDOWN; |
| if (r < 0) |
| return r; |
| if (!s) |
| return -EIO; |
| |
| if (!streq_ptr(class, "container")) |
| return -EIO; |
| |
| r = parse_pid(s, &leader); |
| if (r < 0) |
| return r; |
| if (leader <= 1) |
| return -EIO; |
| |
| *pid = leader; |
| return 0; |
| } |
| |
| int is_kernel_thread(pid_t pid) { |
| _cleanup_free_ char *line = NULL; |
| unsigned long long flags; |
| size_t l, i; |
| const char *p; |
| char *q; |
| int r; |
| |
| if (IN_SET(pid, 0, 1) || pid == getpid_cached()) /* pid 1, and we ourselves certainly aren't a kernel thread */ |
| return 0; |
| if (!pid_is_valid(pid)) |
| return -EINVAL; |
| |
| p = procfs_file_alloca(pid, "stat"); |
| r = read_one_line_file(p, &line); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| /* Skip past the comm field */ |
| q = strrchr(line, ')'); |
| if (!q) |
| return -EINVAL; |
| q++; |
| |
| /* Skip 6 fields to reach the flags field */ |
| for (i = 0; i < 6; i++) { |
| l = strspn(q, WHITESPACE); |
| if (l < 1) |
| return -EINVAL; |
| q += l; |
| |
| l = strcspn(q, WHITESPACE); |
| if (l < 1) |
| return -EINVAL; |
| q += l; |
| } |
| |
| /* Skip preceding whitespace */ |
| l = strspn(q, WHITESPACE); |
| if (l < 1) |
| return -EINVAL; |
| q += l; |
| |
| /* Truncate the rest */ |
| l = strcspn(q, WHITESPACE); |
| if (l < 1) |
| return -EINVAL; |
| q[l] = 0; |
| |
| r = safe_atollu(q, &flags); |
| if (r < 0) |
| return r; |
| |
| return !!(flags & PF_KTHREAD); |
| } |
| |
| int get_process_capeff(pid_t pid, char **ret) { |
| const char *p; |
| int r; |
| |
| assert(pid >= 0); |
| assert(ret); |
| |
| p = procfs_file_alloca(pid, "status"); |
| |
| r = get_proc_field(p, "CapEff", WHITESPACE, ret); |
| if (r == -ENOENT) |
| return -ESRCH; |
| |
| return r; |
| } |
| |
| static int get_process_link_contents(pid_t pid, const char *proc_file, char **ret) { |
| const char *p; |
| int r; |
| |
| assert(proc_file); |
| |
| p = procfs_file_alloca(pid, proc_file); |
| |
| r = readlink_malloc(p, ret); |
| return r == -ENOENT ? -ESRCH : r; |
| } |
| |
| int get_process_exe(pid_t pid, char **ret) { |
| char *d; |
| int r; |
| |
| assert(pid >= 0); |
| |
| r = get_process_link_contents(pid, "exe", ret); |
| if (r < 0) |
| return r; |
| |
| if (ret) { |
| d = endswith(*ret, " (deleted)"); |
| if (d) |
| *d = '\0'; |
| } |
| |
| return 0; |
| } |
| |
| static int get_process_id(pid_t pid, const char *field, uid_t *ret) { |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *p; |
| int r; |
| |
| assert(field); |
| assert(ret); |
| |
| if (pid < 0) |
| return -EINVAL; |
| |
| p = procfs_file_alloca(pid, "status"); |
| r = fopen_unlocked(p, "re", &f); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| for (;;) { |
| _cleanup_free_ char *line = NULL; |
| char *l; |
| |
| r = read_line(f, LONG_LINE_MAX, &line); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| l = strstrip(line); |
| |
| if (startswith(l, field)) { |
| l += strlen(field); |
| l += strspn(l, WHITESPACE); |
| |
| l[strcspn(l, WHITESPACE)] = 0; |
| |
| return parse_uid(l, ret); |
| } |
| } |
| |
| return -EIO; |
| } |
| |
| int get_process_uid(pid_t pid, uid_t *ret) { |
| |
| if (pid == 0 || pid == getpid_cached()) { |
| *ret = getuid(); |
| return 0; |
| } |
| |
| return get_process_id(pid, "Uid:", ret); |
| } |
| |
| int get_process_gid(pid_t pid, gid_t *ret) { |
| |
| if (pid == 0 || pid == getpid_cached()) { |
| *ret = getgid(); |
| return 0; |
| } |
| |
| assert_cc(sizeof(uid_t) == sizeof(gid_t)); |
| return get_process_id(pid, "Gid:", ret); |
| } |
| |
| int get_process_cwd(pid_t pid, char **ret) { |
| assert(pid >= 0); |
| |
| if (pid == 0 || pid == getpid_cached()) |
| return safe_getcwd(ret); |
| |
| return get_process_link_contents(pid, "cwd", ret); |
| } |
| |
| int get_process_root(pid_t pid, char **ret) { |
| assert(pid >= 0); |
| return get_process_link_contents(pid, "root", ret); |
| } |
| |
| #define ENVIRONMENT_BLOCK_MAX (5U*1024U*1024U) |
| |
| int get_process_environ(pid_t pid, char **ret) { |
| _cleanup_fclose_ FILE *f = NULL; |
| _cleanup_free_ char *outcome = NULL; |
| size_t sz = 0; |
| const char *p; |
| int r; |
| |
| assert(pid >= 0); |
| assert(ret); |
| |
| p = procfs_file_alloca(pid, "environ"); |
| |
| r = fopen_unlocked(p, "re", &f); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| for (;;) { |
| char c; |
| |
| if (sz >= ENVIRONMENT_BLOCK_MAX) |
| return -ENOBUFS; |
| |
| if (!GREEDY_REALLOC(outcome, sz + 5)) |
| return -ENOMEM; |
| |
| r = safe_fgetc(f, &c); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| if (c == '\0') |
| outcome[sz++] = '\n'; |
| else |
| sz += cescape_char(c, outcome + sz); |
| } |
| |
| outcome[sz] = '\0'; |
| *ret = TAKE_PTR(outcome); |
| |
| return 0; |
| } |
| |
| int get_process_ppid(pid_t pid, pid_t *ret) { |
| _cleanup_free_ char *line = NULL; |
| unsigned long ppid; |
| const char *p; |
| int r; |
| |
| assert(pid >= 0); |
| |
| if (pid == 0 || pid == getpid_cached()) { |
| if (ret) |
| *ret = getppid(); |
| return 0; |
| } |
| |
| if (pid == 1) /* PID 1 has no parent, shortcut this case */ |
| return -EADDRNOTAVAIL; |
| |
| 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 ppid is zero the process has no parent. Which might be the case for PID 1 but also for |
| * processes originating in other namespaces that are inserted into a pidns. Return a recognizable |
| * error in this case. */ |
| if (ppid == 0) |
| return -EADDRNOTAVAIL; |
| |
| if ((pid_t) ppid < 0 || (unsigned long) (pid_t) ppid != ppid) |
| return -ERANGE; |
| |
| if (ret) |
| *ret = (pid_t) ppid; |
| |
| return 0; |
| } |
| |
| int get_process_umask(pid_t pid, mode_t *ret) { |
| _cleanup_free_ char *m = NULL; |
| const char *p; |
| int r; |
| |
| assert(pid >= 0); |
| assert(ret); |
| |
| p = procfs_file_alloca(pid, "status"); |
| |
| r = get_proc_field(p, "Umask", WHITESPACE, &m); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| return parse_mode(m, ret); |
| } |
| |
| 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_check(const char *name, pid_t pid, WaitFlags flags) { |
| _cleanup_free_ char *buffer = NULL; |
| siginfo_t status; |
| int r, prio; |
| |
| assert(pid > 1); |
| |
| if (!name) { |
| r = get_process_comm(pid, &buffer); |
| if (r < 0) |
| log_debug_errno(r, "Failed to acquire process name of " PID_FMT ", ignoring: %m", pid); |
| else |
| name = buffer; |
| } |
| |
| prio = flags & WAIT_LOG_ABNORMAL ? LOG_ERR : LOG_DEBUG; |
| |
| r = wait_for_terminate(pid, &status); |
| if (r < 0) |
| return log_full_errno(prio, r, "Failed to wait for %s: %m", strna(name)); |
| |
| if (status.si_code == CLD_EXITED) { |
| if (status.si_status != EXIT_SUCCESS) |
| log_full(flags & WAIT_LOG_NON_ZERO_EXIT_STATUS ? LOG_ERR : LOG_DEBUG, |
| "%s failed with exit status %i.", strna(name), status.si_status); |
| else |
| log_debug("%s succeeded.", name); |
| |
| return status.si_status; |
| |
| } else if (IN_SET(status.si_code, CLD_KILLED, CLD_DUMPED)) { |
| |
| log_full(prio, "%s terminated by signal %s.", strna(name), signal_to_string(status.si_status)); |
| return -EPROTO; |
| } |
| |
| log_full(prio, "%s failed due to unknown reason.", strna(name)); |
| return -EPROTO; |
| } |
| |
| /* |
| * Return values: |
| * |
| * < 0 : wait_for_terminate_with_timeout() failed to get the state of the process, the process timed out, the process |
| * was terminated by a signal, or failed for an unknown reason. |
| * |
| * >=0 : The process terminated normally with no failures. |
| * |
| * Success is indicated by a return value of zero, a timeout is indicated by ETIMEDOUT, and all other child failure |
| * states are indicated by error is indicated by a non-zero value. |
| * |
| * This call assumes SIGCHLD has been blocked already, in particular before the child to wait for has been forked off |
| * to remain entirely race-free. |
| */ |
| int wait_for_terminate_with_timeout(pid_t pid, usec_t timeout) { |
| sigset_t mask; |
| int r; |
| usec_t until; |
| |
| assert_se(sigemptyset(&mask) == 0); |
| assert_se(sigaddset(&mask, SIGCHLD) == 0); |
| |
| /* Drop into a sigtimewait-based timeout. Waiting for the |
| * pid to exit. */ |
| until = usec_add(now(CLOCK_MONOTONIC), timeout); |
| for (;;) { |
| usec_t n; |
| siginfo_t status = {}; |
| |
| n = now(CLOCK_MONOTONIC); |
| if (n >= until) |
| break; |
| |
| r = RET_NERRNO(sigtimedwait(&mask, NULL, TIMESPEC_STORE(until - n))); |
| /* Assuming we woke due to the child exiting. */ |
| if (waitid(P_PID, pid, &status, WEXITED|WNOHANG) == 0) { |
| if (status.si_pid == pid) { |
| /* This is the correct child. */ |
| if (status.si_code == CLD_EXITED) |
| return status.si_status == 0 ? 0 : -EPROTO; |
| else |
| return -EPROTO; |
| } |
| } |
| /* Not the child, check for errors and proceed appropriately */ |
| if (r < 0) { |
| switch (r) { |
| case -EAGAIN: |
| /* Timed out, child is likely hung. */ |
| return -ETIMEDOUT; |
| case -EINTR: |
| /* Received a different signal and should retry */ |
| continue; |
| default: |
| /* Return any unexpected errors */ |
| return r; |
| } |
| } |
| } |
| |
| return -EPROTO; |
| } |
| |
| void sigkill_wait(pid_t pid) { |
| assert(pid > 1); |
| |
| (void) kill(pid, SIGKILL); |
| (void) wait_for_terminate(pid, NULL); |
| } |
| |
| void sigkill_waitp(pid_t *pid) { |
| PROTECT_ERRNO; |
| |
| if (!pid) |
| return; |
| if (*pid <= 1) |
| return; |
| |
| sigkill_wait(*pid); |
| } |
| |
| void sigterm_wait(pid_t pid) { |
| assert(pid > 1); |
| |
| (void) kill_and_sigcont(pid, SIGTERM); |
| (void) wait_for_terminate(pid, NULL); |
| } |
| |
| void sigkill_nowait(pid_t pid) { |
| assert(pid > 1); |
| |
| (void) kill(pid, SIGKILL); |
| } |
| |
| void sigkill_nowaitp(pid_t *pid) { |
| PROTECT_ERRNO; |
| |
| if (!pid) |
| return; |
| if (*pid <= 1) |
| return; |
| |
| sigkill_nowait(*pid); |
| } |
| |
| int kill_and_sigcont(pid_t pid, int sig) { |
| int r; |
| |
| r = RET_NERRNO(kill(pid, sig)); |
| |
| /* 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(sig, SIGCONT, SIGKILL)) |
| (void) kill(pid, SIGCONT); |
| |
| return r; |
| } |
| |
| int getenv_for_pid(pid_t pid, const char *field, char **ret) { |
| _cleanup_fclose_ FILE *f = NULL; |
| char *value = NULL; |
| const char *path; |
| size_t l, sum = 0; |
| int r; |
| |
| assert(pid >= 0); |
| assert(field); |
| assert(ret); |
| |
| if (pid == 0 || pid == getpid_cached()) { |
| const char *e; |
| |
| e = getenv(field); |
| if (!e) { |
| *ret = NULL; |
| return 0; |
| } |
| |
| value = strdup(e); |
| if (!value) |
| return -ENOMEM; |
| |
| *ret = value; |
| return 1; |
| } |
| |
| if (!pid_is_valid(pid)) |
| return -EINVAL; |
| |
| path = procfs_file_alloca(pid, "environ"); |
| |
| r = fopen_unlocked(path, "re", &f); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| l = strlen(field); |
| for (;;) { |
| _cleanup_free_ char *line = NULL; |
| |
| if (sum > ENVIRONMENT_BLOCK_MAX) /* Give up searching eventually */ |
| return -ENOBUFS; |
| |
| r = read_nul_string(f, LONG_LINE_MAX, &line); |
| if (r < 0) |
| return r; |
| if (r == 0) /* EOF */ |
| break; |
| |
| sum += r; |
| |
| if (strneq(line, field, l) && line[l] == '=') { |
| value = strdup(line + l + 1); |
| if (!value) |
| return -ENOMEM; |
| |
| *ret = value; |
| return 1; |
| } |
| } |
| |
| *ret = NULL; |
| return 0; |
| } |
| |
| int pid_is_my_child(pid_t pid) { |
| pid_t ppid; |
| int r; |
| |
| if (pid <= 1) |
| return false; |
| |
| r = get_process_ppid(pid, &ppid); |
| if (r < 0) |
| return r; |
| |
| return ppid == getpid_cached(); |
| } |
| |
| 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 (pid == getpid_cached()) |
| 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; |
| |
| if (pid == getpid_cached()) |
| return true; |
| |
| r = get_process_state(pid); |
| if (IN_SET(r, -ESRCH, 'Z')) |
| return false; |
| |
| return true; |
| } |
| |
| int pid_from_same_root_fs(pid_t pid) { |
| const char *root; |
| |
| if (pid < 0) |
| return false; |
| |
| if (pid == 0 || pid == getpid_cached()) |
| return true; |
| |
| root = procfs_file_alloca(pid, "root"); |
| |
| return files_same(root, "/proc/1/root", 0); |
| } |
| |
| bool is_main_thread(void) { |
| static thread_local int cached = 0; |
| |
| if (_unlikely_(cached == 0)) |
| cached = getpid_cached() == gettid() ? 1 : -1; |
| |
| return cached > 0; |
| } |
| |
| 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) { |
| Architecture 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 ARCHITECTURE_SECONDARY |
| if (architecture == ARCHITECTURE_SECONDARY) |
| return PER_LINUX32; |
| #endif |
| |
| return PERSONALITY_INVALID; |
| } |
| |
| const char* personality_to_string(unsigned long p) { |
| Architecture architecture = _ARCHITECTURE_INVALID; |
| |
| if (p == PER_LINUX) |
| architecture = native_architecture(); |
| #ifdef ARCHITECTURE_SECONDARY |
| else if (p == PER_LINUX32) |
| architecture = ARCHITECTURE_SECONDARY; |
| #endif |
| |
| if (architecture < 0) |
| return NULL; |
| |
| return architecture_to_string(architecture); |
| } |
| |
| int safe_personality(unsigned long p) { |
| int ret; |
| |
| /* So here's the deal, personality() is weirdly defined by glibc. In some cases it returns a failure via errno, |
| * and in others as negative return value containing an errno-like value. Let's work around this: this is a |
| * wrapper that uses errno if it is set, and uses the return value otherwise. And then it sets both errno and |
| * the return value indicating the same issue, so that we are definitely on the safe side. |
| * |
| * See https://github.com/systemd/systemd/issues/6737 */ |
| |
| errno = 0; |
| ret = personality(p); |
| if (ret < 0) { |
| if (errno != 0) |
| return -errno; |
| |
| errno = -ret; |
| } |
| |
| return ret; |
| } |
| |
| int opinionated_personality(unsigned long *ret) { |
| int current; |
| |
| /* Returns the current personality, or PERSONALITY_INVALID if we can't determine it. This function is a bit |
| * opinionated though, and ignores all the finer-grained bits and exotic personalities, only distinguishing the |
| * two most relevant personalities: PER_LINUX and PER_LINUX32. */ |
| |
| current = safe_personality(PERSONALITY_INVALID); |
| if (current < 0) |
| return current; |
| |
| if (((unsigned long) current & 0xffff) == PER_LINUX32) |
| *ret = PER_LINUX32; |
| else |
| *ret = PER_LINUX; |
| |
| return 0; |
| } |
| |
| void valgrind_summary_hack(void) { |
| #if HAVE_VALGRIND_VALGRIND_H |
| if (getpid_cached() == 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 pid_t *a, const pid_t *b) { |
| /* Suitable for usage in qsort() */ |
| return CMP(*a, *b); |
| } |
| |
| /* The cached PID, possible values: |
| * |
| * == UNSET [0] → cache not initialized yet |
| * == BUSY [-1] → some thread is initializing it at the moment |
| * any other → the cached PID |
| */ |
| |
| #define CACHED_PID_UNSET ((pid_t) 0) |
| #define CACHED_PID_BUSY ((pid_t) -1) |
| |
| static pid_t cached_pid = CACHED_PID_UNSET; |
| |
| void reset_cached_pid(void) { |
| /* Invoked in the child after a fork(), i.e. at the first moment the PID changed */ |
| cached_pid = CACHED_PID_UNSET; |
| } |
| |
| pid_t getpid_cached(void) { |
| static bool installed = false; |
| pid_t current_value = CACHED_PID_UNSET; |
| |
| /* getpid_cached() is much like getpid(), but caches the value in local memory, to avoid having to invoke a |
| * system call each time. This restores glibc behaviour from before 2.24, when getpid() was unconditionally |
| * cached. Starting with 2.24 getpid() started to become prohibitively expensive when used for detecting when |
| * objects were used across fork()s. With this caching the old behaviour is somewhat restored. |
| * |
| * https://bugzilla.redhat.com/show_bug.cgi?id=1443976 |
| * https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c579f48edba88380635ab98cb612030e3ed8691e |
| */ |
| |
| __atomic_compare_exchange_n( |
| &cached_pid, |
| ¤t_value, |
| CACHED_PID_BUSY, |
| false, |
| __ATOMIC_SEQ_CST, |
| __ATOMIC_SEQ_CST); |
| |
| switch (current_value) { |
| |
| case CACHED_PID_UNSET: { /* Not initialized yet, then do so now */ |
| pid_t new_pid; |
| |
| new_pid = raw_getpid(); |
| |
| if (!installed) { |
| /* __register_atfork() either returns 0 or -ENOMEM, in its glibc implementation. Since it's |
| * only half-documented (glibc doesn't document it but LSB does — though only superficially) |
| * we'll check for errors only in the most generic fashion possible. */ |
| |
| if (pthread_atfork(NULL, NULL, reset_cached_pid) != 0) { |
| /* OOM? Let's try again later */ |
| cached_pid = CACHED_PID_UNSET; |
| return new_pid; |
| } |
| |
| installed = true; |
| } |
| |
| cached_pid = new_pid; |
| return new_pid; |
| } |
| |
| case CACHED_PID_BUSY: /* Somebody else is currently initializing */ |
| return raw_getpid(); |
| |
| default: /* Properly initialized */ |
| return current_value; |
| } |
| } |
| |
| int must_be_root(void) { |
| |
| if (geteuid() == 0) |
| return 0; |
| |
| return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Need to be root."); |
| } |
| |
| static void restore_sigsetp(sigset_t **ssp) { |
| if (*ssp) |
| (void) sigprocmask(SIG_SETMASK, *ssp, NULL); |
| } |
| |
| int safe_fork_full( |
| const char *name, |
| const int except_fds[], |
| size_t n_except_fds, |
| ForkFlags flags, |
| pid_t *ret_pid) { |
| |
| pid_t original_pid, pid; |
| sigset_t saved_ss, ss; |
| _unused_ _cleanup_(restore_sigsetp) sigset_t *saved_ssp = NULL; |
| bool block_signals = false, block_all = false; |
| int prio, r; |
| |
| /* A wrapper around fork(), that does a couple of important initializations in addition to mere forking. Always |
| * returns the child's PID in *ret_pid. Returns == 0 in the child, and > 0 in the parent. */ |
| |
| prio = flags & FORK_LOG ? LOG_ERR : LOG_DEBUG; |
| |
| original_pid = getpid_cached(); |
| |
| if (flags & FORK_FLUSH_STDIO) { |
| fflush(stdout); |
| fflush(stderr); /* This one shouldn't be necessary, stderr should be unbuffered anyway, but let's better be safe than sorry */ |
| } |
| |
| if (flags & (FORK_RESET_SIGNALS|FORK_DEATHSIG)) { |
| /* We temporarily block all signals, so that the new child has them blocked initially. This way, we can |
| * be sure that SIGTERMs are not lost we might send to the child. */ |
| |
| assert_se(sigfillset(&ss) >= 0); |
| block_signals = block_all = true; |
| |
| } else if (flags & FORK_WAIT) { |
| /* Let's block SIGCHLD at least, so that we can safely watch for the child process */ |
| |
| assert_se(sigemptyset(&ss) >= 0); |
| assert_se(sigaddset(&ss, SIGCHLD) >= 0); |
| block_signals = true; |
| } |
| |
| if (block_signals) { |
| if (sigprocmask(SIG_SETMASK, &ss, &saved_ss) < 0) |
| return log_full_errno(prio, errno, "Failed to set signal mask: %m"); |
| saved_ssp = &saved_ss; |
| } |
| |
| if ((flags & (FORK_NEW_MOUNTNS|FORK_NEW_USERNS)) != 0) |
| pid = raw_clone(SIGCHLD| |
| (FLAGS_SET(flags, FORK_NEW_MOUNTNS) ? CLONE_NEWNS : 0) | |
| (FLAGS_SET(flags, FORK_NEW_USERNS) ? CLONE_NEWUSER : 0)); |
| else |
| pid = fork(); |
| if (pid < 0) |
| return log_full_errno(prio, errno, "Failed to fork off '%s': %m", strna(name)); |
| if (pid > 0) { |
| /* We are in the parent process */ |
| |
| log_debug("Successfully forked off '%s' as PID " PID_FMT ".", strna(name), pid); |
| |
| if (flags & FORK_WAIT) { |
| if (block_all) { |
| /* undo everything except SIGCHLD */ |
| ss = saved_ss; |
| assert_se(sigaddset(&ss, SIGCHLD) >= 0); |
| (void) sigprocmask(SIG_SETMASK, &ss, NULL); |
| } |
| |
| r = wait_for_terminate_and_check(name, pid, (flags & FORK_LOG ? WAIT_LOG : 0)); |
| if (r < 0) |
| return r; |
| if (r != EXIT_SUCCESS) /* exit status > 0 should be treated as failure, too */ |
| return -EPROTO; |
| } |
| |
| if (ret_pid) |
| *ret_pid = pid; |
| |
| return 1; |
| } |
| |
| /* We are in the child process */ |
| |
| /* Restore signal mask manually */ |
| saved_ssp = NULL; |
| |
| if (flags & FORK_REOPEN_LOG) { |
| /* Close the logs if requested, before we log anything. And make sure we reopen it if needed. */ |
| log_close(); |
| log_set_open_when_needed(true); |
| log_settle_target(); |
| } |
| |
| if (name) { |
| r = rename_process(name); |
| if (r < 0) |
| log_full_errno(flags & FORK_LOG ? LOG_WARNING : LOG_DEBUG, |
| r, "Failed to rename process, ignoring: %m"); |
| } |
| |
| if (flags & (FORK_DEATHSIG|FORK_DEATHSIG_SIGINT)) |
| if (prctl(PR_SET_PDEATHSIG, (flags & FORK_DEATHSIG_SIGINT) ? SIGINT : SIGTERM) < 0) { |
| log_full_errno(prio, errno, "Failed to set death signal: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| |
| if (flags & FORK_RESET_SIGNALS) { |
| r = reset_all_signal_handlers(); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to reset signal handlers: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| |
| /* This implicitly undoes the signal mask stuff we did before the fork()ing above */ |
| r = reset_signal_mask(); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to reset signal mask: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } else if (block_signals) { /* undo what we did above */ |
| if (sigprocmask(SIG_SETMASK, &saved_ss, NULL) < 0) { |
| log_full_errno(prio, errno, "Failed to restore signal mask: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (flags & FORK_DEATHSIG) { |
| pid_t ppid; |
| /* Let's see if the parent PID is still the one we started from? If not, then the parent |
| * already died by the time we set PR_SET_PDEATHSIG, hence let's emulate the effect */ |
| |
| ppid = getppid(); |
| if (ppid == 0) |
| /* Parent is in a different PID namespace. */; |
| else if (ppid != original_pid) { |
| log_debug("Parent died early, raising SIGTERM."); |
| (void) raise(SIGTERM); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (FLAGS_SET(flags, FORK_NEW_MOUNTNS | FORK_MOUNTNS_SLAVE)) { |
| /* Optionally, make sure we never propagate mounts to the host. */ |
| if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0) { |
| log_full_errno(prio, errno, "Failed to remount root directory as MS_SLAVE: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (FLAGS_SET(flags, FORK_PRIVATE_TMP)) { |
| assert(FLAGS_SET(flags, FORK_NEW_MOUNTNS)); |
| |
| /* Optionally, overmount new tmpfs instance on /tmp/. */ |
| r = mount_nofollow("tmpfs", "/tmp", "tmpfs", |
| MS_NOSUID|MS_NODEV, |
| "mode=01777" TMPFS_LIMITS_RUN); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to overmount /tmp/: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (flags & FORK_CLOSE_ALL_FDS) { |
| /* Close the logs here in case it got reopened above, as close_all_fds() would close them for us */ |
| log_close(); |
| |
| r = close_all_fds(except_fds, n_except_fds); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to close all file descriptors: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (flags & FORK_CLOEXEC_OFF) { |
| r = fd_cloexec_many(except_fds, n_except_fds, false); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to turn off O_CLOEXEC on file descriptors: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| /* When we were asked to reopen the logs, do so again now */ |
| if (flags & FORK_REOPEN_LOG) { |
| log_open(); |
| log_set_open_when_needed(false); |
| } |
| |
| if (flags & FORK_NULL_STDIO) { |
| r = make_null_stdio(); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to connect stdin/stdout to /dev/null: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| |
| } else if (flags & FORK_STDOUT_TO_STDERR) { |
| if (dup2(STDERR_FILENO, STDOUT_FILENO) < 0) { |
| log_full_errno(prio, errno, "Failed to connect stdout to stderr: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (flags & FORK_RLIMIT_NOFILE_SAFE) { |
| r = rlimit_nofile_safe(); |
| if (r < 0) { |
| log_full_errno(prio, r, "Failed to lower RLIMIT_NOFILE's soft limit to 1K: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (ret_pid) |
| *ret_pid = getpid_cached(); |
| |
| return 0; |
| } |
| |
| int namespace_fork( |
| const char *outer_name, |
| const char *inner_name, |
| const int except_fds[], |
| size_t n_except_fds, |
| ForkFlags flags, |
| int pidns_fd, |
| int mntns_fd, |
| int netns_fd, |
| int userns_fd, |
| int root_fd, |
| pid_t *ret_pid) { |
| |
| int r; |
| |
| /* This is much like safe_fork(), but forks twice, and joins the specified namespaces in the middle |
| * process. This ensures that we are fully a member of the destination namespace, with pidns an all, so that |
| * /proc/self/fd works correctly. */ |
| |
| r = safe_fork_full(outer_name, except_fds, n_except_fds, (flags|FORK_DEATHSIG) & ~(FORK_REOPEN_LOG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE), ret_pid); |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| pid_t pid; |
| |
| /* Child */ |
| |
| r = namespace_enter(pidns_fd, mntns_fd, netns_fd, userns_fd, root_fd); |
| if (r < 0) { |
| log_full_errno(FLAGS_SET(flags, FORK_LOG) ? LOG_ERR : LOG_DEBUG, r, "Failed to join namespace: %m"); |
| _exit(EXIT_FAILURE); |
| } |
| |
| /* We mask a few flags here that either make no sense for the grandchild, or that we don't have to do again */ |
| r = safe_fork_full(inner_name, except_fds, n_except_fds, flags & ~(FORK_WAIT|FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_NULL_STDIO), &pid); |
| if (r < 0) |
| _exit(EXIT_FAILURE); |
| if (r == 0) { |
| /* Child */ |
| if (ret_pid) |
| *ret_pid = pid; |
| return 0; |
| } |
| |
| r = wait_for_terminate_and_check(inner_name, pid, FLAGS_SET(flags, FORK_LOG) ? WAIT_LOG : 0); |
| if (r < 0) |
| _exit(EXIT_FAILURE); |
| |
| _exit(r); |
| } |
| |
| return 1; |
| } |
| |
| int set_oom_score_adjust(int value) { |
| char t[DECIMAL_STR_MAX(int)]; |
| |
| xsprintf(t, "%i", value); |
| |
| return write_string_file("/proc/self/oom_score_adj", t, |
| WRITE_STRING_FILE_VERIFY_ON_FAILURE|WRITE_STRING_FILE_DISABLE_BUFFER); |
| } |
| |
| int get_oom_score_adjust(int *ret) { |
| _cleanup_free_ char *t = NULL; |
| int r, a; |
| |
| r = read_virtual_file("/proc/self/oom_score_adj", SIZE_MAX, &t, NULL); |
| if (r < 0) |
| return r; |
| |
| delete_trailing_chars(t, WHITESPACE); |
| |
| assert_se(safe_atoi(t, &a) >= 0); |
| assert_se(oom_score_adjust_is_valid(a)); |
| |
| if (ret) |
| *ret = a; |
| return 0; |
| } |
| |
| int pidfd_get_pid(int fd, pid_t *ret) { |
| char path[STRLEN("/proc/self/fdinfo/") + DECIMAL_STR_MAX(int)]; |
| _cleanup_free_ char *fdinfo = NULL; |
| char *p; |
| int r; |
| |
| if (fd < 0) |
| return -EBADF; |
| |
| xsprintf(path, "/proc/self/fdinfo/%i", fd); |
| |
| r = read_full_virtual_file(path, &fdinfo, NULL); |
| if (r == -ENOENT) /* if fdinfo doesn't exist we assume the process does not exist */ |
| return -ESRCH; |
| if (r < 0) |
| return r; |
| |
| p = startswith(fdinfo, "Pid:"); |
| if (!p) { |
| p = strstr(fdinfo, "\nPid:"); |
| if (!p) |
| return -ENOTTY; /* not a pidfd? */ |
| |
| p += 5; |
| } |
| |
| p += strspn(p, WHITESPACE); |
| p[strcspn(p, WHITESPACE)] = 0; |
| |
| return parse_pid(p, ret); |
| } |
| |
| int pidfd_verify_pid(int pidfd, pid_t pid) { |
| pid_t current_pid; |
| int r; |
| |
| assert(pidfd >= 0); |
| assert(pid > 0); |
| |
| r = pidfd_get_pid(pidfd, ¤t_pid); |
| if (r < 0) |
| return r; |
| |
| return current_pid != pid ? -ESRCH : 0; |
| } |
| |
| static int rlimit_to_nice(rlim_t limit) { |
| if (limit <= 1) |
| return PRIO_MAX-1; /* i.e. 19 */ |
| |
| if (limit >= -PRIO_MIN + PRIO_MAX) |
| return PRIO_MIN; /* i.e. -20 */ |
| |
| return PRIO_MAX - (int) limit; |
| } |
| |
| int setpriority_closest(int priority) { |
| int current, limit, saved_errno; |
| struct rlimit highest; |
| |
| /* Try to set requested nice level */ |
| if (setpriority(PRIO_PROCESS, 0, priority) >= 0) |
| return 1; |
| |
| /* Permission failed */ |
| saved_errno = -errno; |
| if (!ERRNO_IS_PRIVILEGE(saved_errno)) |
| return saved_errno; |
| |
| errno = 0; |
| current = getpriority(PRIO_PROCESS, 0); |
| if (errno != 0) |
| return -errno; |
| |
| if (priority == current) |
| return 1; |
| |
| /* Hmm, we'd expect that raising the nice level from our status quo would always work. If it doesn't, |
| * then the whole setpriority() system call is blocked to us, hence let's propagate the error |
| * right-away */ |
| if (priority > current) |
| return saved_errno; |
| |
| if (getrlimit(RLIMIT_NICE, &highest) < 0) |
| return -errno; |
| |
| limit = rlimit_to_nice(highest.rlim_cur); |
| |
| /* We are already less nice than limit allows us */ |
| if (current < limit) { |
| log_debug("Cannot raise nice level, permissions and the resource limit do not allow it."); |
| return 0; |
| } |
| |
| /* Push to the allowed limit */ |
| if (setpriority(PRIO_PROCESS, 0, limit) < 0) |
| return -errno; |
| |
| log_debug("Cannot set requested nice level (%i), used next best (%i).", priority, limit); |
| return 0; |
| } |
| |
| _noreturn_ void freeze(void) { |
| log_close(); |
| |
| /* Make sure nobody waits for us (i.e. on one of our sockets) anymore. Note that we use |
| * close_all_fds_without_malloc() instead of plain close_all_fds() here, since we want this function |
| * to be compatible with being called from signal handlers. */ |
| (void) close_all_fds_without_malloc(NULL, 0); |
| |
| /* Let's not freeze right away, but keep reaping zombies. */ |
| for (;;) { |
| siginfo_t si = {}; |
| |
| if (waitid(P_ALL, 0, &si, WEXITED) < 0 && errno != EINTR) |
| break; |
| } |
| |
| /* waitid() failed with an unexpected error, things are really borked. Freeze now! */ |
| for (;;) |
| pause(); |
| } |
| |
| 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); |
