diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-06-21 14:38:52 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-07-20 10:23:51 -0500 |
| commit | d80f7d7b2c75c5954d335dffbccca62a5002c3e0 (patch) | |
| tree | 323d202b5875f926c9b35f660ed3c1aa6334183d /include/linux/sched/signal.h | |
| parent | cbe9dac379047730e39c7e570eddd27124b0d2dc (diff) | |
signal: Guarantee that SIGNAL_GROUP_EXIT is set on process exit
Track how many threads have not started exiting and when the last
thread starts exiting set SIGNAL_GROUP_EXIT.
This guarantees that SIGNAL_GROUP_EXIT will get set when a process
exits. In practice this achieves nothing as glibc's implementation of
_exit calls sys_group_exit then sys_exit. While glibc's implemenation
of pthread_exit calls exit (which cleansup and calls _exit) if it is
the last thread and sys_exit if it is the last thread.
This means the only way the kernel might observe a process that does
not set call exit_group is if the language runtime does not use glibc.
With more cleanups I hope to move the decrement of quick_threads
earlier.
Link: https://lkml.kernel.org/r/87bkukd4tc.fsf_-_@email.froward.int.ebiederm.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/sched/signal.h')
| -rw-r--r-- | include/linux/sched/signal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index cafbe03eed01..20099268fa25 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -94,6 +94,7 @@ struct signal_struct { refcount_t sigcnt; atomic_t live; int nr_threads; + int quick_threads; struct list_head thread_head; wait_queue_head_t wait_chldexit; /* for wait4() */ |