> + ret = dprintf(event_control, "%d %d %s", efd, cfd, argv[2]);
I found it won't return negative value for invalid input, though
errno is set properly.
try:
# ./cgroup_event_listner /cgroup/cgroup.procs abc
while strace shows write() does return -1:
# strace ./cgroup_event_listner /cgroup/cgroup.procs abc
...
write(6, "7 5 abc"..., 7) = -1 EINVAL (Invalid argument)
> + if (ret == -1) {
> + perror("Cannot write to cgroup.event_control");
> + goto out;
> + }
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