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linux: Add pidfd_send_signal

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This was added on Linux 5.1(3eb39f47934f9d5a3027fe00d906a45fe3a15fad)
as a way to avoid the race condition of using kill (where PID might be
reused by the kernel between between obtaining the pid and sending the
signal).

If the siginfo_t argument is NULL then pidfd_send_signal is equivalent
to kill.  If it is not NULL pidfd_send_signal is equivalent to
rt_sigqueueinfo.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella
2022-01-28 17:13:41 -03:00
parent 32dd8c251a
commit 56cf9e8eec
37 changed files with 46 additions and 3 deletions
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sysdeps/unix/sysv/linux/Versions
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@ -302,6 +302,7 @@ libc {
GLIBC_2.36 {
pidfd_open;
pidfd_getfd;
pidfd_send_signal;
}
GLIBC_PRIVATE {
# functions used in other libraries