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core: split out various system/process initialization steps into its own function

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Again, no changes in behaviour, just some refactoring to make main() a
bit more digestable.
This commit is contained in:
Lennart Poettering 2017-12-06 21:31:35 +01:00
parent 970777b59a
commit 5afbaa36f4
1 changed files with 78 additions and 52 deletions
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130
src/core/main.c
View file

@ -1845,6 +1845,78 @@ static int invoke_main_loop(
}
}
static int initialize_runtime(
bool skip_setup,
struct rlimit *saved_rlimit_nofile,
struct rlimit *saved_rlimit_memlock,
const char **ret_error_message) {
int r;
assert(ret_error_message);
/* Sets up various runtime parameters. Many of these initializations are conditionalized:
*
* - Some only apply to --system instances
* - Some only apply to --user instances
* - Some only apply when we first start up, but not when we reexecute
*/
if (arg_system && !skip_setup) {
if (arg_show_status > 0)
status_welcome();
hostname_setup();
machine_id_setup(NULL, arg_machine_id, NULL);
loopback_setup();
bump_unix_max_dgram_qlen();
test_usr();
}
if (arg_system && arg_runtime_watchdog > 0 && arg_runtime_watchdog != USEC_INFINITY)
watchdog_set_timeout(&arg_runtime_watchdog);
if (arg_timer_slack_nsec != NSEC_INFINITY)
if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0)
log_error_errno(errno, "Failed to adjust timer slack: %m");
if (arg_system && !cap_test_all(arg_capability_bounding_set)) {
r = capability_bounding_set_drop_usermode(arg_capability_bounding_set);
if (r < 0) {
*ret_error_message = "Failed to drop capability bounding set of usermode helpers";
return log_emergency_errno(r, "Failed to drop capability bounding set of usermode helpers: %m");
}
r = capability_bounding_set_drop(arg_capability_bounding_set, true);
if (r < 0) {
*ret_error_message = "Failed to drop capability bounding set";
return log_emergency_errno(r, "Failed to drop capability bounding set: %m");
}
}
if (arg_syscall_archs) {
r = enforce_syscall_archs(arg_syscall_archs);
if (r < 0) {
*ret_error_message = "Failed to set syscall architectures";
return r;
}
}
if (!arg_system)
/* Become reaper of our children */
if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0)
log_warning_errno(errno, "Failed to make us a subreaper: %m");
if (arg_system) {
/* Bump up RLIMIT_NOFILE for systemd itself */
(void) bump_rlimit_nofile(saved_rlimit_nofile);
(void) bump_rlimit_memlock(saved_rlimit_memlock);
}
return 0;
}
static int do_queue_default_job(
Manager *m,
const char **ret_error_message) {
@ -2261,58 +2333,12 @@ int main(int argc, char *argv[]) {
}
if (arg_action == ACTION_RUN) {
if (arg_system && !skip_setup) {
if (arg_show_status > 0)
status_welcome();
hostname_setup();
machine_id_setup(NULL, arg_machine_id, NULL);
loopback_setup();
bump_unix_max_dgram_qlen();
test_usr();
}
if (arg_system && arg_runtime_watchdog > 0 && arg_runtime_watchdog != USEC_INFINITY)
watchdog_set_timeout(&arg_runtime_watchdog);
if (arg_timer_slack_nsec != NSEC_INFINITY)
if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0)
log_error_errno(errno, "Failed to adjust timer slack: %m");
if (arg_system && !cap_test_all(arg_capability_bounding_set)) {
r = capability_bounding_set_drop_usermode(arg_capability_bounding_set);
if (r < 0) {
log_emergency_errno(r, "Failed to drop capability bounding set of usermode helpers: %m");
error_message = "Failed to drop capability bounding set of usermode helpers";
goto finish;
}
r = capability_bounding_set_drop(arg_capability_bounding_set, true);
if (r < 0) {
log_emergency_errno(r, "Failed to drop capability bounding set: %m");
error_message = "Failed to drop capability bounding set";
goto finish;
}
}
if (arg_syscall_archs) {
r = enforce_syscall_archs(arg_syscall_archs);
if (r < 0) {
error_message = "Failed to set syscall architectures";
goto finish;
}
}
if (!arg_system)
/* Become reaper of our children */
if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0)
log_warning_errno(errno, "Failed to make us a subreaper: %m");
if (arg_system) {
/* Bump up RLIMIT_NOFILE for systemd itself */
(void) bump_rlimit_nofile(&saved_rlimit_nofile);
(void) bump_rlimit_memlock(&saved_rlimit_memlock);
}
r = initialize_runtime(skip_setup,
&saved_rlimit_nofile,
&saved_rlimit_memlock,
&error_message);
if (r < 0)
goto finish;
}
r = manager_new(arg_system ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,