diff options
Diffstat (limited to 'src/core/killall.c')
| -rw-r--r-- | src/core/killall.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/src/core/killall.c b/src/core/killall.c deleted file mode 100644 index 55200ffa48..0000000000 --- a/src/core/killall.c +++ /dev/null @@ -1,177 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2010 ProFUSION embedded systems - - 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 <sys/wait.h> -#include <signal.h> -#include <errno.h> - -#include "util.h" -#include "def.h" -#include "killall.h" - -#define TIMEOUT_USEC (5 * USEC_PER_SEC) - -static bool ignore_proc(pid_t pid) { - char buf[PATH_MAX]; - FILE *f; - char c; - size_t count; - uid_t uid; - int r; - - /* We are PID 1, let's not commit suicide */ - if (pid == 1) - return true; - - r = get_process_uid(pid, &uid); - if (r < 0) - return true; /* not really, but better safe than sorry */ - - /* Non-root processes otherwise are always subject to be killed */ - if (uid != 0) - return false; - - snprintf(buf, sizeof(buf), "/proc/%lu/cmdline", (unsigned long) pid); - char_array_0(buf); - - f = fopen(buf, "re"); - if (!f) - return true; /* not really, but has the desired effect */ - - count = fread(&c, 1, 1, f); - fclose(f); - - /* Kernel threads have an empty cmdline */ - if (count <= 0) - return true; - - /* Processes with argv[0][0] = '@' we ignore from the killing - * spree. - * - * http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons */ - if (count == 1 && c == '@') - return true; - - return false; -} - -static void wait_for_children(int n_processes, sigset_t *mask) { - usec_t until; - - assert(mask); - - until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC; - for (;;) { - struct timespec ts; - int k; - usec_t n; - - for (;;) { - pid_t pid = waitpid(-1, NULL, WNOHANG); - - if (pid == 0) - break; - - if (pid < 0 && errno == ECHILD) - return; - - if (n_processes > 0) - if (--n_processes == 0) - return; - } - - n = now(CLOCK_MONOTONIC); - if (n >= until) - return; - - timespec_store(&ts, until - n); - - if ((k = sigtimedwait(mask, NULL, &ts)) != SIGCHLD) { - - if (k < 0 && errno != EAGAIN) { - log_error("sigtimedwait() failed: %m"); - return; - } - - if (k >= 0) - log_warning("sigtimedwait() returned unexpected signal."); - } - } -} - -static int killall(int sig) { - DIR *dir; - struct dirent *d; - unsigned int n_processes = 0; - - dir = opendir("/proc"); - if (!dir) - return -errno; - - while ((d = readdir(dir))) { - pid_t pid; - - if (d->d_type != DT_DIR && - d->d_type != DT_UNKNOWN) - continue; - - if (parse_pid(d->d_name, &pid) < 0) - continue; - - if (ignore_proc(pid)) - continue; - - if (kill(pid, sig) >= 0) - n_processes++; - else if (errno != ENOENT) - log_warning("Could not kill %d: %m", pid); - } - - closedir(dir); - - return n_processes; -} - -void broadcast_signal(int sig, bool wait_for_exit) { - sigset_t mask, oldmask; - int n_processes; - - assert_se(sigemptyset(&mask) == 0); - assert_se(sigaddset(&mask, SIGCHLD) == 0); - assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0); - - if (kill(-1, SIGSTOP) < 0 && errno != ESRCH) - log_warning("kill(-1, SIGSTOP) failed: %m"); - - n_processes = killall(sig); - - if (kill(-1, SIGCONT) < 0 && errno != ESRCH) - log_warning("kill(-1, SIGCONT) failed: %m"); - - if (n_processes <= 0) - goto finish; - - if (wait_for_exit) - wait_for_children(n_processes, &mask); - -finish: - sigprocmask(SIG_SETMASK, &oldmask, NULL); -} |