bool is_clean_exit_lsb(int code, int status, ExitStatusSet *success_status) {
if (is_clean_exit(code, status, success_status))
return true;
return
code == CLD_EXITED &&
(status == EXIT_NOTINSTALLED || status == EXIT_NOTCONFIGURED);
}
int main(int argc, char *argv[]) {
int ret = EXIT_FAILURE;
_cleanup_endmntent_ FILE *f = NULL;
struct mntent* me;
Hashmap *pids = NULL;
if (argc > 1) {
log_error("This program takes no argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
f = setmntent("/etc/fstab", "r");
if (!f) {
if (errno == ENOENT)
return EXIT_SUCCESS;
log_error("Failed to open /etc/fstab: %m");
return EXIT_FAILURE;
}
pids = hashmap_new(trivial_hash_func, trivial_compare_func);
if (!pids) {
log_error("Failed to allocate set");
goto finish;
}
ret = EXIT_SUCCESS;
while ((me = getmntent(f))) {
pid_t pid;
int k;
char *s;
/* Remount the root fs, /usr and all API VFS */
if (!mount_point_is_api(me->mnt_dir) &&
!path_equal(me->mnt_dir, "/") &&
!path_equal(me->mnt_dir, "/usr"))
continue;
log_debug("Remounting %s", me->mnt_dir);
pid = fork();
if (pid < 0) {
log_error("Failed to fork: %m");
ret = EXIT_FAILURE;
continue;
}
if (pid == 0) {
const char *arguments[5];
/* Child */
arguments[0] = "/bin/mount";
arguments[1] = me->mnt_dir;
arguments[2] = "-o";
arguments[3] = "remount";
arguments[4] = NULL;
execv("/bin/mount", (char **) arguments);
log_error("Failed to execute /bin/mount: %m");
_exit(EXIT_FAILURE);
}
/* Parent */
s = strdup(me->mnt_dir);
if (!s) {
log_oom();
ret = EXIT_FAILURE;
continue;
}
k = hashmap_put(pids, UINT_TO_PTR(pid), s);
if (k < 0) {
log_error("Failed to add PID to set: %s", strerror(-k));
ret = EXIT_FAILURE;
continue;
}
}
while (!hashmap_isempty(pids)) {
siginfo_t si = {};
char *s;
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
log_error("waitid() failed: %m");
ret = EXIT_FAILURE;
break;
}
s = hashmap_remove(pids, UINT_TO_PTR(si.si_pid));
if (s) {
if (!is_clean_exit(si.si_code, si.si_status, NULL)) {
if (si.si_code == CLD_EXITED)
log_error("/bin/mount for %s exited with exit status %i.", s, si.si_status);
else
log_error("/bin/mount for %s terminated by signal %s.", s, signal_to_string(si.si_status));
ret = EXIT_FAILURE;
}
free(s);
}
}
finish:
if (pids)
hashmap_free_free(pids);
return ret;
}
static int busname_peek_message(BusName *n) {
struct kdbus_cmd_recv cmd_recv = {
.size = sizeof(cmd_recv),
.flags = KDBUS_RECV_PEEK,
};
struct kdbus_cmd_free cmd_free = {
.size = sizeof(cmd_free),
};
const char *comm = NULL;
struct kdbus_item *d;
struct kdbus_msg *k;
size_t start, ps, sz, delta;
void *p = NULL;
pid_t pid = 0;
int r;
/* Generate a friendly debug log message about which process
* caused triggering of this bus name. This simply peeks the
* metadata of the first queued message and logs it. */
assert(n);
/* Let's shortcut things a bit, if debug logging is turned off
* anyway. */
if (log_get_max_level() < LOG_DEBUG)
return 0;
r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
log_unit_error(UNIT(n)->id, "%s: Failed to query activation message: %m", UNIT(n)->id);
return -errno;
}
/* We map as late as possible, and unmap imemdiately after
* use. On 32bit address space is scarce and we want to be
* able to handle a lot of activator connections at the same
* time, and hence shouldn't keep the mmap()s around for
* longer than necessary. */
ps = page_size();
start = (cmd_recv.msg.offset / ps) * ps;
delta = cmd_recv.msg.offset - start;
sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size);
p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start);
if (p == MAP_FAILED) {
log_unit_error(UNIT(n)->id, "%s: Failed to map activation message: %m", UNIT(n)->id);
r = -errno;
goto finish;
}
k = (struct kdbus_msg *) ((uint8_t *) p + delta);
KDBUS_ITEM_FOREACH(d, k, items) {
switch (d->type) {
case KDBUS_ITEM_PIDS:
pid = d->pids.pid;
break;
case KDBUS_ITEM_PID_COMM:
comm = d->str;
break;
}
}
if (pid > 0)
log_unit_debug(UNIT(n)->id, "%s: Activation triggered by process " PID_FMT " (%s)", UNIT(n)->id, pid, strna(comm));
r = 0;
finish:
if (p)
(void) munmap(p, sz);
cmd_free.offset = cmd_recv.msg.offset;
if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0)
log_unit_warning(UNIT(n)->id, "Failed to free peeked message, ignoring: %m");
return r;
}
static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
BusName *n = userdata;
assert(n);
assert(fd >= 0);
if (n->state != BUSNAME_LISTENING)
return 0;
log_unit_debug(UNIT(n)->id, "Activation request on %s", UNIT(n)->id);
if (revents != EPOLLIN) {
log_unit_error(UNIT(n)->id, "%s: Got unexpected poll event (0x%x) on starter fd.",
UNIT(n)->id, revents);
goto fail;
}
busname_peek_message(n);
busname_enter_running(n);
return 0;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
return 0;
}
static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) {
BusName *n = BUSNAME(u);
BusNameResult f;
assert(n);
assert(pid >= 0);
if (pid != n->control_pid)
return;
n->control_pid = 0;
if (is_clean_exit(code, status, NULL))
f = BUSNAME_SUCCESS;
else if (code == CLD_EXITED)
f = BUSNAME_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = BUSNAME_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = BUSNAME_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown sigchld code");
log_unit_full(u->id,
f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
"%s control process exited, code=%s status=%i",
u->id, sigchld_code_to_string(code), status);
if (f != BUSNAME_SUCCESS)
n->result = f;
switch (n->state) {
case BUSNAME_MAKING:
if (f == BUSNAME_SUCCESS)
busname_enter_listening(n);
else
busname_enter_signal(n, BUSNAME_SIGTERM, f);
break;
case BUSNAME_SIGTERM:
case BUSNAME_SIGKILL:
busname_enter_dead(n, f);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
}
int main(int argc, char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_endmntent_ FILE *f = NULL;
struct mntent* me;
int r;
if (argc > 1) {
log_error("This program takes no argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
f = setmntent("/etc/fstab", "r");
if (!f) {
if (errno == ENOENT) {
r = 0;
goto finish;
}
r = log_error_errno(errno, "Failed to open /etc/fstab: %m");
goto finish;
}
pids = hashmap_new(NULL);
if (!pids) {
r = log_oom();
goto finish;
}
while ((me = getmntent(f))) {
pid_t pid;
int k;
char *s;
/* Remount the root fs, /usr and all API VFS */
if (!mount_point_is_api(me->mnt_dir) &&
!path_equal(me->mnt_dir, "/") &&
!path_equal(me->mnt_dir, "/usr"))
continue;
log_debug("Remounting %s", me->mnt_dir);
pid = fork();
if (pid < 0) {
r = log_error_errno(errno, "Failed to fork: %m");
goto finish;
}
if (pid == 0) {
/* Child */
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
(void) prctl(PR_SET_PDEATHSIG, SIGTERM);
execv(MOUNT_PATH, STRV_MAKE(MOUNT_PATH, me->mnt_dir, "-o", "remount"));
log_error_errno(errno, "Failed to execute " MOUNT_PATH ": %m");
_exit(EXIT_FAILURE);
}
/* Parent */
s = strdup(me->mnt_dir);
if (!s) {
r = log_oom();
goto finish;
}
k = hashmap_put(pids, PID_TO_PTR(pid), s);
if (k < 0) {
free(s);
r = log_oom();
goto finish;
}
}
r = 0;
while (!hashmap_isempty(pids)) {
siginfo_t si = {};
char *s;
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
r = log_error_errno(errno, "waitid() failed: %m");
goto finish;
}
s = hashmap_remove(pids, PID_TO_PTR(si.si_pid));
if (s) {
if (!is_clean_exit(si.si_code, si.si_status, EXIT_CLEAN_COMMAND, NULL)) {
if (si.si_code == CLD_EXITED)
log_error(MOUNT_PATH " for %s exited with exit status %i.", s, si.si_status);
else
log_error(MOUNT_PATH " for %s terminated by signal %s.", s, signal_to_string(si.si_status));
r = -ENOEXEC;
}
free(s);
}
}
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
