static int found_override(const char *top, const char *bottom) {
_cleanup_free_ char *dest = NULL;
int k;
pid_t pid;
assert(top);
assert(bottom);
if (null_or_empty_path(top) > 0) {
notify_override_masked(top, bottom);
return 0;
}
k = readlink_malloc(top, &dest);
if (k >= 0) {
if (equivalent(dest, bottom) > 0)
notify_override_equivalent(top, bottom);
else
notify_override_redirected(top, bottom);
return 0;
}
notify_override_overridden(top, bottom);
if (!arg_diff)
return 0;
putchar('\n');
fflush(stdout);
pid = fork();
if (pid < 0) {
log_error("Failed to fork off diff: %m");
return -errno;
} else if (pid == 0) {
execlp("diff", "diff", "-us", "--", bottom, top, NULL);
log_error("Failed to execute diff: %m");
_exit(1);
}
wait_for_terminate(pid, NULL);
putchar('\n');
return 0;
}
static int found_override(const char *top, const char *bottom) {
_cleanup_free_ char *dest = NULL;
int k;
pid_t pid;
assert(top);
assert(bottom);
if (null_or_empty_path(top) > 0)
return notify_override_masked(top, bottom);
k = readlink_malloc(top, &dest);
if (k >= 0) {
if (equivalent(dest, bottom) > 0)
return notify_override_equivalent(top, bottom);
else
return notify_override_redirected(top, bottom);
}
k = notify_override_overridden(top, bottom);
if (!arg_diff)
return k;
putchar('\n');
fflush(stdout);
pid = fork();
if (pid < 0)
return log_error_errno(errno, "Failed to fork off diff: %m");
else if (pid == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
execlp("diff", "diff", "-us", "--", bottom, top, NULL);
log_error_errno(errno, "Failed to execute diff: %m");
_exit(EXIT_FAILURE);
}
wait_for_terminate_and_warn("diff", pid, false);
putchar('\n');
return k;
}
static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
pid_t _pid;
int r;
if (null_or_empty_path(path)) {
log_debug("%s is empty (a mask).", path);
return 0;
}
r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid);
if (r < 0)
return r;
if (r == 0) {
char *_argv[2];
if (stdout_fd >= 0) {
r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO);
if (r < 0)
_exit(EXIT_FAILURE);
}
(void) rlimit_nofile_safe();
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);
}
*pid = _pid;
return 1;
}
static int do_execute(char **directories, usec_t timeout, char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_set_free_free_ Set *seen = NULL;
char **directory;
/* 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);
pids = hashmap_new(NULL);
if (!pids)
return log_oom();
seen = set_new(&string_hash_ops);
if (!seen)
return log_oom();
STRV_FOREACH(directory, directories) {
_cleanup_closedir_ DIR *d;
struct dirent *de;
d = opendir(*directory);
if (!d) {
if (errno == ENOENT)
continue;
return log_error_errno(errno, "Failed to open directory %s: %m", *directory);
}
FOREACH_DIRENT(de, d, break) {
_cleanup_free_ char *path = NULL;
pid_t pid;
int r;
if (!dirent_is_file(de))
continue;
if (set_contains(seen, de->d_name)) {
log_debug("%1$s/%2$s skipped (%2$s was already seen).", *directory, de->d_name);
continue;
}
r = set_put_strdup(seen, de->d_name);
if (r < 0)
return log_oom();
path = strjoin(*directory, "/", de->d_name, NULL);
if (!path)
return log_oom();
if (null_or_empty_path(path)) {
log_debug("%s is empty (a mask).", path);
continue;
}
pid = fork();
if (pid < 0) {
log_error_errno(errno, "Failed to fork: %m");
continue;
} else if (pid == 0) {
char *_argv[2];
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
if (!argv) {
_argv[0] = path;
_argv[1] = NULL;
argv = _argv;
} else
argv[0] = path;
execv(path, argv);
return log_error_errno(errno, "Failed to execute %s: %m", path);
}
log_debug("Spawned %s as " PID_FMT ".", path, pid);
r = hashmap_put(pids, PID_TO_PTR(pid), path);
if (r < 0)
return log_oom();
path = NULL;
}
}
