[PATCH] setpgid: should work for sub-threads
setpgid(0, pgid) or setpgid(forked_child_pid, pgid) does not work unless the calling process is a thread_group_leader(). 'man setpgid' does not tell anything about that, so I consider this behaviour is a bug. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Oren Laadan <orenl@cs.columbia.edu> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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