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cgroups: fix cgroup_event_listener error handling
The error handling in cgroup_event_listener.c did not correctly deal with either an error opening either <control_file> or cgroup.event_control. Due to an uninitialized variable the program exit code was undefined if either of these opens failed. This patch simplifies and corrects cgroup_event_listener.c error handling by: 1. using err*() rather than printf(),exit() 2. depending on process exit to close open files With this patch failures always return non-zero error. Signed-off-by: Greg Thelen <email@example.com> Acked-by: Li Zefan <firstname.lastname@example.org> Signed-off-by: Tejun Heo <email@example.com>
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