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authorLennart Poettering <lennart@poettering.net>2011-03-04 01:49:37 +0100
committerLennart Poettering <lennart@poettering.net>2011-03-04 01:50:38 +0100
commit0595f9a1c182a84581749823ef47c5f292e545f9 (patch)
treeef8f431f54f63faa56299990d93570d0881ef0c2 /src/path.c
parent3fc546f93d92c09188d5018ea47def33b149c2e9 (diff)
path: after installing inotify watches, recheck file again to fix race
Diffstat (limited to 'src/path.c')
-rw-r--r--src/path.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/src/path.c b/src/path.c
index 1455b47995..f7878b56ae 100644
--- a/src/path.c
+++ b/src/path.c
@@ -282,7 +282,7 @@ static void path_set_state(Path *p, PathState state) {
unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
}
-static void path_enter_waiting(Path *p, bool initial, bool recheck);
+static void path_enter_waiting(Path *p, bool initial, bool recheck, bool skip_watch);
static int path_coldplug(Unit *u) {
Path *p = PATH(u);
@@ -294,7 +294,7 @@ static int path_coldplug(Unit *u) {
if (p->deserialized_state == PATH_WAITING ||
p->deserialized_state == PATH_RUNNING)
- path_enter_waiting(p, true, true);
+ path_enter_waiting(p, true, true, false);
else
path_set_state(p, p->deserialized_state);
}
@@ -341,7 +341,7 @@ fail:
}
-static void path_enter_waiting(Path *p, bool initial, bool recheck) {
+static void path_enter_waiting(Path *p, bool initial, bool recheck, bool skip_watch) {
PathSpec *s;
int r;
bool good = false;
@@ -389,8 +389,16 @@ static void path_enter_waiting(Path *p, bool initial, bool recheck) {
}
waiting:
- if ((r = path_watch(p)) < 0)
- goto fail;
+ if (!skip_watch) {
+ if ((r = path_watch(p)) < 0)
+ goto fail;
+
+ /* Hmm, so now we have created inotify watches, but the file
+ * might have appeared/been removed by now, so we must
+ * recheck */
+ path_enter_waiting(p, false, true, true);
+ return;
+ }
path_set_state(p, PATH_WAITING);
return;
@@ -410,7 +418,7 @@ static int path_start(Unit *u) {
return -ENOENT;
p->failure = false;
- path_enter_waiting(p, true, true);
+ path_enter_waiting(p, true, true, false);
return 0;
}
@@ -541,7 +549,7 @@ static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
if (changed)
path_enter_running(p);
else
- path_enter_waiting(p, false, true);
+ path_enter_waiting(p, false, true, false);
free(buf);
@@ -590,7 +598,7 @@ void path_unit_notify(Unit *u, UnitActiveState new_state) {
/* Hmm, so inotify was triggered since the
* last activation, so I guess we need to
* recheck what is going on. */
- path_enter_waiting(p, false, p->inotify_triggered);
+ path_enter_waiting(p, false, p->inotify_triggered, false);
}
}