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systemd/1057-udev-unify-event-timeout-handling.patch

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From dd5eddd28a74a49607a8fffcaf960040dba98479 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Tue, 29 Jul 2014 15:18:27 +0200
Subject: [PATCH] udev: unify event timeout handling
---
man/systemd-udevd.service.xml | 7 +++---
man/udev.xml | 7 ------
src/test/test-udev.c | 5 ++--
src/udev/udev-event.c | 53 ++++++++++++++++++++++-------------------
src/udev/udev-rules.c | 38 ++++++++---------------------
src/udev/udev.h | 8 +++----
src/udev/udevadm-test.c | 2 +-
src/udev/udevd.c | 32 ++++++++++---------------
8 files changed, 61 insertions(+), 91 deletions(-)
diff --git man/systemd-udevd.service.xml man/systemd-udevd.service.xml
index 8de43b1..3053dc7 100644
--- man/systemd-udevd.service.xml
+++ man/systemd-udevd.service.xml
@@ -99,9 +99,8 @@
<varlistentry>
<term><option>--event-timeout=</option></term>
<listitem>
- <para>Wait for the event to finish up to the given
- number of seconds. After this time the event will
- be terminated. Default is 30.</para>
+ <para>Set the number of seconds to wait for events to finish. After
+ this time the event will be terminated. The default is 30 seconds.</para>
</listitem>
</varlistentry>
@@ -171,7 +170,7 @@
<listitem>
<para>Wait for events to finish up to the given number
of seconds. This option might be useful if events are
- terminated due to a timeout in large configurations.</para>
+ terminated due to kernel drivers taking too long to initialize.</para>
</listitem>
</varlistentry>
<varlistentry>
diff --git man/udev.xml man/udev.xml
index 4e5f8f0..123c073 100644
--- man/udev.xml
+++ man/udev.xml
@@ -516,13 +516,6 @@
</listitem>
</varlistentry>
<varlistentry>
- <term><option>event_timeout=</option></term>
- <listitem>
- <para>Number of seconds an event waits for operations to finish before
- giving up and terminating itself.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><option>string_escape=<replaceable>none|replace</replaceable></option></term>
<listitem>
<para>Usually control and other possibly unsafe characters are replaced
diff --git src/test/test-udev.c src/test/test-udev.c
index b057cc8..26d6537 100644
--- src/test/test-udev.c
+++ src/test/test-udev.c
@@ -80,7 +80,6 @@ out:
return err;
}
-
int main(int argc, char *argv[]) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_udev_event_unref_ struct udev_event *event = NULL;
@@ -155,8 +154,8 @@ int main(int argc, char *argv[]) {
}
}
- udev_event_execute_rules(event, rules, &sigmask_orig);
- udev_event_execute_run(event, NULL);
+ udev_event_execute_rules(event, USEC_PER_SEC, rules, &sigmask_orig);
+ udev_event_execute_run(event, USEC_PER_SEC, NULL);
out:
if (event != NULL && event->fd_signal >= 0)
close(event->fd_signal);
diff --git src/udev/udev-event.c src/udev/udev-event.c
index 5213a4a..6ad80d5 100644
--- src/udev/udev-event.c
+++ src/udev/udev-event.c
@@ -48,7 +48,6 @@ struct udev_event *udev_event_new(struct udev_device *dev)
udev_list_init(udev, &event->seclabel_list, false);
event->fd_signal = -1;
event->birth_usec = now(CLOCK_MONOTONIC);
- event->timeout_usec = 30 * 1000 * 1000;
return event;
}
@@ -422,9 +421,10 @@ static int spawn_exec(struct udev_event *event,
}
static void spawn_read(struct udev_event *event,
- const char *cmd,
- int fd_stdout, int fd_stderr,
- char *result, size_t ressize)
+ usec_t timeout_usec,
+ const char *cmd,
+ int fd_stdout, int fd_stderr,
+ char *result, size_t ressize)
{
size_t respos = 0;
int fd_ep = -1;
@@ -467,15 +467,15 @@ static void spawn_read(struct udev_event *event,
struct epoll_event ev[4];
int i;
- if (event->timeout_usec > 0) {
+ if (timeout_usec > 0) {
usec_t age_usec;
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
- if (age_usec >= event->timeout_usec) {
+ if (age_usec >= timeout_usec) {
log_error("timeout '%s'", cmd);
goto out;
}
- timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+ timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
} else {
timeout = -1;
}
@@ -543,8 +543,9 @@ out:
close(fd_ep);
}
-static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
-{
+static int spawn_wait(struct udev_event *event,
+ usec_t timeout_usec,
+ const char *cmd, pid_t pid) {
struct pollfd pfd[1];
int err = 0;
@@ -555,14 +556,14 @@ static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
int timeout;
int fdcount;
- if (event->timeout_usec > 0) {
+ if (timeout_usec > 0) {
usec_t age_usec;
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
- if (age_usec >= event->timeout_usec)
+ if (age_usec >= timeout_usec)
timeout = 1000;
else
- timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+ timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
} else {
timeout = -1;
}
@@ -657,9 +658,9 @@ out:
}
int udev_event_spawn(struct udev_event *event,
+ usec_t timeout_usec,
const char *cmd, char **envp, const sigset_t *sigmask,
- char *result, size_t ressize)
-{
+ char *result, size_t ressize) {
struct udev *udev = event->udev;
int outpipe[2] = {-1, -1};
int errpipe[2] = {-1, -1};
@@ -728,11 +729,13 @@ int udev_event_spawn(struct udev_event *event,
errpipe[WRITE_END] = -1;
}
- spawn_read(event, cmd,
- outpipe[READ_END], errpipe[READ_END],
- result, ressize);
+ spawn_read(event,
+ timeout_usec,
+ cmd,
+ outpipe[READ_END], errpipe[READ_END],
+ result, ressize);
- err = spawn_wait(event, cmd, pid);
+ err = spawn_wait(event, timeout_usec, cmd, pid);
}
out:
@@ -776,8 +779,9 @@ static int rename_netif(struct udev_event *event)
return r;
}
-void udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
-{
+void udev_event_execute_rules(struct udev_event *event,
+ usec_t timeout_usec,
+ struct udev_rules *rules, const sigset_t *sigmask) {
struct udev_device *dev = event->dev;
if (udev_device_get_subsystem(dev) == NULL)
@@ -791,7 +795,7 @@ void udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules
if (major(udev_device_get_devnum(dev)) != 0)
udev_watch_end(event->udev, dev);
- udev_rules_apply_to_event(rules, event, sigmask);
+ udev_rules_apply_to_event(rules, event, timeout_usec, sigmask);
if (major(udev_device_get_devnum(dev)) != 0)
udev_node_remove(dev);
@@ -808,7 +812,7 @@ void udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules
udev_watch_end(event->udev, event->dev_db);
}
- udev_rules_apply_to_event(rules, event, sigmask);
+ udev_rules_apply_to_event(rules, event, timeout_usec, sigmask);
/* rename a new network interface, if needed */
if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
@@ -883,8 +887,7 @@ void udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules
}
}
-void udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
-{
+void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, const sigset_t *sigmask) {
struct udev_list_entry *list_entry;
udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
@@ -907,7 +910,7 @@ void udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
udev_event_apply_format(event, cmd, program, sizeof(program));
envp = udev_device_get_properties_envp(event->dev);
- udev_event_spawn(event, program, envp, sigmask, NULL, 0);
+ udev_event_spawn(event, timeout_usec, program, envp, sigmask, NULL, 0);
}
}
}
diff --git src/udev/udev-rules.c src/udev/udev-rules.c
index 9864016..aacde38 100644
--- src/udev/udev-rules.c
+++ src/udev/udev-rules.c
@@ -137,7 +137,6 @@ enum token_type {
TK_M_PARENTS_MAX,
TK_M_TEST, /* val, mode_t */
- TK_M_EVENT_TIMEOUT, /* int */
TK_M_PROGRAM, /* val */
TK_M_IMPORT_FILE, /* val */
TK_M_IMPORT_PROG, /* val */
@@ -201,7 +200,6 @@ struct token {
uid_t uid;
gid_t gid;
int devlink_prio;
- int event_timeout;
int watch;
enum udev_builtin_cmd builtin_cmd;
};
@@ -275,7 +273,6 @@ static const char *token_str(enum token_type type)
[TK_M_PARENTS_MAX] = "M PARENTS_MAX",
[TK_M_TEST] = "M TEST",
- [TK_M_EVENT_TIMEOUT] = "M EVENT_TIMEOUT",
[TK_M_PROGRAM] = "M PROGRAM",
[TK_M_IMPORT_FILE] = "M IMPORT_FILE",
[TK_M_IMPORT_PROG] = "M IMPORT_PROG",
@@ -409,9 +406,6 @@ static void dump_token(struct udev_rules *rules, struct token *token)
case TK_A_SECLABEL:
log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
break;
- case TK_M_EVENT_TIMEOUT:
- log_debug("%s %u", token_str(type), token->key.event_timeout);
- break;
case TK_A_GOTO:
log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
break;
@@ -627,8 +621,9 @@ static int import_file_into_properties(struct udev_device *dev, const char *file
return 0;
}
-static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
-{
+static int import_program_into_properties(struct udev_event *event,
+ usec_t timeout_usec,
+ const char *program, const sigset_t *sigmask) {
struct udev_device *dev = event->dev;
char **envp;
char result[UTIL_LINE_SIZE];
@@ -636,7 +631,7 @@ static int import_program_into_properties(struct udev_event *event, const char *
int err;
envp = udev_device_get_properties_envp(dev);
- err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
+ err = udev_event_spawn(event, timeout_usec, program, envp, sigmask, result, sizeof(result));
if (err < 0)
return err;
@@ -942,9 +937,6 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
case TK_A_MODE_ID:
token->key.mode = *(mode_t *)data;
break;
- case TK_M_EVENT_TIMEOUT:
- token->key.event_timeout = *(int *)data;
- break;
case TK_RULE:
case TK_M_PARENTS_MIN:
case TK_M_PARENTS_MAX:
@@ -1462,14 +1454,6 @@ static int add_rule(struct udev_rules *rules, char *line,
rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
}
- pos = strstr(value, "event_timeout=");
- if (pos != NULL) {
- int tout = atoi(&pos[strlen("event_timeout=")]);
-
- rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
- }
-
- pos = strstr(value, "string_escape=");
if (pos != NULL) {
pos = &pos[strlen("string_escape=")];
if (startswith(pos, "none"))
@@ -1829,8 +1813,10 @@ enum escape_type {
ESCAPE_REPLACE,
};
-int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
-{
+int udev_rules_apply_to_event(struct udev_rules *rules,
+ struct udev_event *event,
+ usec_t timeout_usec,
+ const sigset_t *sigmask) {
struct token *cur;
struct token *rule;
enum escape_type esc = ESCAPE_UNSET;
@@ -2024,10 +2010,6 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
goto nomatch;
break;
}
- case TK_M_EVENT_TIMEOUT:
- log_debug("OPTIONS event_timeout=%u", cur->key.event_timeout);
- event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
- break;
case TK_M_PROGRAM: {
char program[UTIL_PATH_SIZE];
char **envp;
@@ -2042,7 +2024,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
- if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
+ if (udev_event_spawn(event, timeout_usec, program, envp, sigmask, result, sizeof(result)) < 0) {
if (cur->key.op != OP_NOMATCH)
goto nomatch;
} else {
@@ -2078,7 +2060,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
- if (import_program_into_properties(event, import, sigmask) != 0)
+ if (import_program_into_properties(event, timeout_usec, import, sigmask) != 0)
if (cur->key.op != OP_NOMATCH)
goto nomatch;
break;
diff --git src/udev/udev.h src/udev/udev.h
index 62538bc..4aca70b 100644
--- src/udev/udev.h
+++ src/udev/udev.h
@@ -43,7 +43,6 @@ struct udev_event {
struct udev_list run_list;
int exec_delay;
usec_t birth_usec;
- usec_t timeout_usec;
int fd_signal;
unsigned int builtin_run;
unsigned int builtin_ret;
@@ -72,7 +71,7 @@ struct udev_rules;
struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names);
struct udev_rules *udev_rules_unref(struct udev_rules *rules);
bool udev_rules_check_timestamp(struct udev_rules *rules);
-int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask);
+int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, usec_t timeout_usec, const sigset_t *sigmask);
int udev_rules_apply_static_dev_perms(struct udev_rules *rules);
/* udev-event.c */
@@ -82,10 +81,11 @@ size_t udev_event_apply_format(struct udev_event *event, const char *src, char *
int udev_event_apply_subsys_kernel(struct udev_event *event, const char *string,
char *result, size_t maxsize, int read_value);
int udev_event_spawn(struct udev_event *event,
+ usec_t timeout_usec,
const char *cmd, char **envp, const sigset_t *sigmask,
char *result, size_t ressize);
-void udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigset);
-void udev_event_execute_run(struct udev_event *event, const sigset_t *sigset);
+void udev_event_execute_rules(struct udev_event *event, usec_t timeout_usec, struct udev_rules *rules, const sigset_t *sigset);
+void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, const sigset_t *sigset);
int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]);
/* udev-watch.c */
diff --git src/udev/udevadm-test.c src/udev/udevadm-test.c
index 6a2f548..52cc26c 100644
--- src/udev/udevadm-test.c
+++ src/udev/udevadm-test.c
@@ -138,7 +138,7 @@ static int adm_test(struct udev *udev, int argc, char *argv[])
goto out;
}
- udev_event_execute_rules(event, rules, &sigmask_orig);
+ udev_event_execute_rules(event, 30 * USEC_PER_SEC, rules, &sigmask_orig);
udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev))
printf("%s=%s\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry));
diff --git src/udev/udevd.c src/udev/udevd.c
index c5dd739..dee7a87 100644
--- src/udev/udevd.c
+++ src/udev/udevd.c
@@ -74,7 +74,7 @@ static bool reload;
static int children;
static int children_max;
static int exec_delay;
-static int event_timeout = 30;
+static usec_t event_timeout_usec = 30 * USEC_PER_SEC;
static sigset_t sigmask_orig;
static UDEV_LIST(event_list);
static UDEV_LIST(worker_list);
@@ -313,13 +313,10 @@ static void worker_new(struct event *event)
}
}
- if (event_timeout != 30)
- udev_event->timeout_usec = event_timeout * USEC_PER_SEC;
-
/* apply rules, create node, symlinks */
- udev_event_execute_rules(udev_event, rules, &sigmask_orig);
+ udev_event_execute_rules(udev_event, event_timeout_usec, rules, &sigmask_orig);
- udev_event_execute_run(udev_event, &sigmask_orig);
+ udev_event_execute_run(udev_event, event_timeout_usec, &sigmask_orig);
/* apply/restore inotify watch */
if (udev_event->inotify_watch) {
@@ -1014,15 +1011,14 @@ static void kernel_cmdline_options(struct udev *udev)
} else if (startswith(opt, "udev.exec-delay=")) {
exec_delay = strtoul(opt + 16, NULL, 0);
} else if (startswith(opt, "udev.event-timeout=")) {
- event_timeout = strtoul(opt + 16, NULL, 0);
+ event_timeout_usec = strtoul(opt + 16, NULL, 0) * USEC_PER_SEC;
}
free(s);
}
}
-int main(int argc, char *argv[])
-{
+int main(int argc, char *argv[]) {
struct udev *udev;
sigset_t mask;
int daemonize = false;
@@ -1077,7 +1073,7 @@ int main(int argc, char *argv[])
exec_delay = strtoul(optarg, NULL, 0);
break;
case 't':
- event_timeout = strtoul(optarg, NULL, 0);
+ event_timeout_usec = strtoul(optarg, NULL, 0) * USEC_PER_SEC;
break;
case 'D':
debug = true;
@@ -1103,6 +1099,7 @@ int main(int argc, char *argv[])
" --debug\n"
" --children-max=<maximum number of workers>\n"
" --exec-delay=<seconds to wait before executing RUN=>\n"
+ " --event-timeout=<seconds to wait before terminating an event>\n"
" --resolve-names=early|late|never\n"
" --version\n"
" --help\n"
@@ -1416,20 +1413,17 @@ int main(int argc, char *argv[])
if (worker->state != WORKER_RUNNING)
continue;
- if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > event_timeout * USEC_PER_SEC) {
- log_error("worker [%u] %s timeout; kill it", worker->pid,
- worker->event ? worker->event->devpath : "<idle>");
+ if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > event_timeout_usec) {
+ log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
kill(worker->pid, SIGKILL);
worker->state = WORKER_KILLED;
/* drop reference taken for state 'running' */
worker_unref(worker);
- if (worker->event) {
- log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
- worker->event->exitcode = -64;
- event_queue_delete(worker->event);
- worker->event = NULL;
- }
+ log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
+ worker->event->exitcode = -64;
+ event_queue_delete(worker->event);
+ worker->event = NULL;
}
}
--
1.7.9.2
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