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/***
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 <dirent.h>
#include <errno.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "exec-util.h"
#include "hashmap.h"
#include "macro.h"
#include "process-util.h"
#include "set.h"
#include "signal-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
/* Put this test here for a lack of better place */
assert_cc(EAGAIN == EWOULDBLOCK);
static int do_spawn(const char *path, char *argv[], pid_t *pid) {
pid_t _pid;
if (null_or_empty_path(path)) {
log_debug("%s is empty (a mask).", path);
return 0;
}
_pid = fork();
if (_pid < 0)
return log_error_errno(errno, "Failed to fork: %m");
if (_pid == 0) {
char *_argv[2];
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
if (!argv) {
_argv[0] = (char*) path;
_argv[1] = NULL;
argv = _argv;
} else
argv[0] = (char*) path;
execv(path, argv);
log_error_errno(errno, "Failed to execute %s: %m", path);
_exit(EXIT_FAILURE);
}
log_debug("Spawned %s as " PID_FMT ".", path, _pid);
*pid = _pid;
return 1;
}
static int do_execute(char **directories, usec_t timeout, char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_strv_free_ char **paths = NULL;
char **path;
int r;
/* We fork this all off from a child process so that we can
* somewhat cleanly make use of SIGALRM to set a time limit */
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
r = conf_files_list_strv(&paths, NULL, NULL, (const char* const*) directories);
if (r < 0)
return r;
pids = hashmap_new(NULL);
if (!pids)
return log_oom();
STRV_FOREACH(path, paths) {
_cleanup_free_ char *t = NULL;
pid_t pid;
t = strdup(*path);
if (!t)
return log_oom();
r = do_spawn(t, argv, &pid);
if (r <= 0)
continue;
r = hashmap_put(pids, PID_TO_PTR(pid), t);
if (r < 0)
return log_oom();
t = NULL;
}
/* Abort execution of this process after the timout. We simply
* rely on SIGALRM as default action terminating the process,
* and turn on alarm(). */
if (timeout != USEC_INFINITY)
alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
while (!hashmap_isempty(pids)) {
_cleanup_free_ char *t = NULL;
pid_t pid;
pid = PTR_TO_PID(hashmap_first_key(pids));
assert(pid > 0);
t = hashmap_remove(pids, PID_TO_PTR(pid));
assert(t);
wait_for_terminate_and_warn(t, pid, true);
}
return 0;
}
void execute_directories(const char* const* directories, usec_t timeout, char *argv[]) {
pid_t executor_pid;
int r;
char *name;
char **dirs = (char**) directories;
assert(!strv_isempty(dirs));
name = basename(dirs[0]);
assert(!isempty(name));
/* Executes all binaries in the directories in parallel and waits
* for them to finish. Optionally a timeout is applied. If a file
* with the same name exists in more than one directory, the
* earliest one wins. */
executor_pid = fork();
if (executor_pid < 0) {
log_error_errno(errno, "Failed to fork: %m");
return;
} else if (executor_pid == 0) {
r = do_execute(dirs, timeout, argv);
_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
}
wait_for_terminate_and_warn(name, executor_pid, true);
}
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