1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright 2010 Lennart Poettering
13 #include "alloc-util.h"
14 #include "conf-files.h"
16 #include "exec-util.h"
21 #include "process-util.h"
23 #include "signal-util.h"
24 #include "stat-util.h"
25 #include "string-util.h"
27 #include "terminal-util.h"
30 /* Put this test here for a lack of better place */
31 assert_cc(EAGAIN == EWOULDBLOCK);
33 static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
38 if (null_or_empty_path(path)) {
39 log_debug("%s is empty (a mask).", path);
43 r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid);
50 r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO);
56 _argv[0] = (char*) path;
60 argv[0] = (char*) path;
63 log_error_errno(errno, "Failed to execute %s: %m", path);
71 static int do_execute(
74 gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
75 void* const callback_args[_STDOUT_CONSUME_MAX],
79 _cleanup_hashmap_free_free_ Hashmap *pids = NULL;
80 _cleanup_strv_free_ char **paths = NULL;
84 /* We fork this all off from a child process so that we can somewhat cleanly make
85 * use of SIGALRM to set a time limit.
87 * If callbacks is nonnull, execution is serial. Otherwise, we default to parallel.
90 r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE|CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, (const char* const*) directories);
95 pids = hashmap_new(NULL);
100 /* Abort execution of this process after the timout. We simply rely on SIGALRM as
101 * default action terminating the process, and turn on alarm(). */
103 if (timeout != USEC_INFINITY)
104 alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC));
106 STRV_FOREACH(path, paths) {
107 _cleanup_free_ char *t = NULL;
108 _cleanup_close_ int fd = -1;
109 #if 0 /// No "maybe uninitialized" warning in elogind
120 fd = open_serialization_fd(basename(*path));
122 return log_error_errno(fd, "Failed to open serialization file: %m");
125 r = do_spawn(t, argv, fd, &pid);
130 r = hashmap_put(pids, PID_TO_PTR(pid), t);
135 r = wait_for_terminate_and_check(t, pid, WAIT_LOG);
139 if (lseek(fd, 0, SEEK_SET) < 0)
140 return log_error_errno(errno, "Failed to seek on serialization fd: %m");
142 r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]);
145 return log_error_errno(r, "Failed to process output from %s: %m", *path);
150 r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]);
152 return log_error_errno(r, "Callback two failed: %m");
155 while (!hashmap_isempty(pids)) {
156 _cleanup_free_ char *t = NULL;
159 pid = PTR_TO_PID(hashmap_first_key(pids));
162 t = hashmap_remove(pids, PID_TO_PTR(pid));
165 (void) wait_for_terminate_and_check(t, pid, WAIT_LOG);
171 int execute_directories(
172 const char* const* directories,
174 gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
175 void* const callback_args[_STDOUT_CONSUME_MAX],
178 char **dirs = (char**) directories;
179 _cleanup_close_ int fd = -1;
183 assert(!strv_isempty(dirs));
185 name = basename(dirs[0]);
186 assert(!isempty(name));
189 assert(callback_args);
190 assert(callbacks[STDOUT_GENERATE]);
191 assert(callbacks[STDOUT_COLLECT]);
192 assert(callbacks[STDOUT_CONSUME]);
194 fd = open_serialization_fd(name);
196 return log_error_errno(fd, "Failed to open serialization file: %m");
199 /* Executes all binaries in the directories serially or in parallel and waits for
200 * them to finish. Optionally a timeout is applied. If a file with the same name
201 * exists in more than one directory, the earliest one wins. */
203 r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
207 r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv);
208 _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
214 if (lseek(fd, 0, SEEK_SET) < 0)
215 return log_error_errno(errno, "Failed to rewind serialization fd: %m");
217 r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]);
220 return log_error_errno(r, "Failed to parse returned data: %m");
224 #if 0 /// UNNEEDED by elogind
225 static int gather_environment_generate(int fd, void *arg) {
226 char ***env = arg, **x, **y;
227 _cleanup_fclose_ FILE *f = NULL;
228 _cleanup_strv_free_ char **new = NULL;
231 /* Read a series of VAR=value assignments from fd, use them to update the list of
232 * variables in env. Also update the exported environment.
234 * fd is always consumed, even on error.
245 r = load_env_file_pairs(f, NULL, NULL, &new);
249 STRV_FOREACH_PAIR(x, y, new) {
252 if (!env_name_is_valid(*x)) {
253 log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x);
257 p = strjoin(*x, "=", *y);
261 r = strv_env_replace(env, p);
265 if (setenv(*x, *y, true) < 0)
272 static int gather_environment_collect(int fd, void *arg) {
274 _cleanup_fclose_ FILE *f = NULL;
277 /* Write out a series of env=cescape(VAR=value) assignments to fd. */
287 r = serialize_environment(f, *env);
292 return errno > 0 ? -errno : -EIO;
297 static int gather_environment_consume(int fd, void *arg) {
299 _cleanup_fclose_ FILE *f = NULL;
303 /* Read a series of env=cescape(VAR=value) assignments from fd into env. */
313 FOREACH_LINE(line, f, return -EIO) {
316 k = deserialize_environment(env, line);
318 log_error_errno(k, "Invalid line \"%s\": %m", line);
326 const gather_stdout_callback_t gather_environment[] = {
327 gather_environment_generate,
328 gather_environment_collect,
329 gather_environment_consume,