If read() returns with errno == EIDRM, we know the cgroup has been
removed.
Signed-off-by: Li Zefan <lize...@huawei.com>
---
tools/cgroup/cgroup_event_listener.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/tools/cgroup/cgroup_event_listener.c
b/tools/cgroup/cgroup_event_listener.c
index 4eb5507..19e3d4a 100644
--- a/tools/cgroup/cgroup_event_listener.c
+++ b/tools/cgroup/cgroup_event_listener.c
@@ -62,18 +62,16 @@ int main(int argc, char **argv)
if (ret == -1) {
if (errno == EINTR)
continue;
- err(1, "Cannot read from eventfd");
+ if (errno != EIDRM)
+ err(1, "Cannot read from eventfd");
}
- assert(ret == sizeof(result));
- ret = access(event_control_path, W_OK);
- if ((ret == -1) && (errno == ENOENT)) {
- puts("The cgroup seems to have removed.");
+ if (ret == -1 && errno == EIDRM) {
+ puts("The cgroup has been removed.");
break;
}
- if (ret == -1)
- err(1, "cgroup.event_control is not accessible any
more");
+ assert(ret == sizeof(result));
printf("%s %s: crossed\n", argv[1], argv[2]);
}
--
1.8.0.2
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