systemd/systemd-240-upstream_fix_return_values.patch
2023-12-30 11:38:22 +01:00

151 lines
5.7 KiB
Diff

From 93a3444a0941c293cecd84920c049b1ba8c81b3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sun, 6 Jan 2019 22:17:00 +0100
Subject: [PATCH] udev: rework how we handle the return value from spawned
programs
When running PROGRAM="...", we would log
systemd-udevd[447]: Failed to wait spawned command '...': Input/output error
no matter why the program actually failed, at error level.
The code wouldn't distinguish between an internal failure and a failure in the
program being called and run sd_event_exit(..., -EIO) on any kind of error. EIO
is rather misleading here, becuase it suggests a serious error.
on_spawn_sigchld is updated to set the return code to distinguish failure to
spawn, including the program being killed by a signal (a negative return value),
and the program failing (positive return value).
The logging levels are adjusted, so that for PROGRAM= calls, which are
essentially "if" statements, we only log at debug level (unless we get a
timeout or segfault or another unexpected error).
---
src/udev/udev-event.c | 38 +++++++++++++-------------------------
src/udev/udev-rules.c | 12 +++++++-----
2 files changed, 20 insertions(+), 30 deletions(-)
diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
index 3e916976c03..07b7365e3aa 100644
--- a/src/udev/udev-event.c
+++ b/src/udev/udev-event.c
@@ -504,38 +504,34 @@ static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *use
static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
Spawn *spawn = userdata;
+ int ret = -EIO;
assert(spawn);
switch (si->si_code) {
case CLD_EXITED:
- if (si->si_status == 0) {
+ if (si->si_status == 0)
log_debug("Process '%s' succeeded.", spawn->cmd);
- sd_event_exit(sd_event_source_get_event(s), 0);
-
- return 1;
- }
-
- log_full(spawn->accept_failure ? LOG_DEBUG : LOG_WARNING,
- "Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
+ else
+ log_full(spawn->accept_failure ? LOG_DEBUG : LOG_WARNING,
+ "Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
+ ret = si->si_status;
break;
case CLD_KILLED:
case CLD_DUMPED:
- log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
-
+ log_error("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
break;
default:
log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
}
- sd_event_exit(sd_event_source_get_event(s), -EIO);
-
+ sd_event_exit(sd_event_source_get_event(s), ret);
return 1;
}
static int spawn_wait(Spawn *spawn) {
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
- int r, ret;
+ int r;
assert(spawn);
@@ -586,15 +582,7 @@ static int spawn_wait(Spawn *spawn) {
if (r < 0)
return r;
- r = sd_event_loop(e);
- if (r < 0)
- return r;
-
- r = sd_event_get_exit_code(e, &ret);
- if (r < 0)
- return r;
-
- return ret;
+ return sd_event_loop(e);
}
int udev_event_spawn(UdevEvent *event,
@@ -679,12 +667,12 @@ int udev_event_spawn(UdevEvent *event,
};
r = spawn_wait(&spawn);
if (r < 0)
- return log_error_errno(r, "Failed to wait spawned command '%s': %m", cmd);
+ return log_error_errno(r, "Failed to wait for spawned command '%s': %m", cmd);
if (result)
result[spawn.result_len] = '\0';
- return r;
+ return r; /* 0 for success, and positive if the program failed */
}
static int rename_netif(UdevEvent *event) {
@@ -899,7 +887,7 @@ void udev_event_execute_run(UdevEvent *event, usec_t timeout_usec) {
(void) usleep(event->exec_delay_usec);
}
- udev_event_spawn(event, timeout_usec, false, command, NULL, 0);
+ (void) udev_event_spawn(event, timeout_usec, false, command, NULL, 0);
}
}
}
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 53c68d254a6..f697972debe 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -645,11 +645,13 @@ static int import_program_into_properties(UdevEvent *event,
const char *program) {
char result[UTIL_LINE_SIZE];
char *line;
- int err;
+ int r;
- err = udev_event_spawn(event, timeout_usec, true, program, result, sizeof(result));
- if (err < 0)
- return err;
+ r = udev_event_spawn(event, timeout_usec, false, program, result, sizeof result);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return -EIO;
line = result;
while (line) {
@@ -1959,7 +1961,7 @@ int udev_rules_apply_to_event(
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
- if (udev_event_spawn(event, timeout_usec, true, program, result, sizeof(result)) < 0) {
+ if (udev_event_spawn(event, timeout_usec, true, program, result, sizeof(result)) != 0) {
if (cur->key.op != OP_NOMATCH)
goto nomatch;
} else {