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56cf9e8eec
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>
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/* Wrapper for file descriptors that refers to a process functions.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _PIDFD_H
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#include <fcntl.h>
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#include <bits/types/siginfo_t.h>
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#define PIDFD_NONBLOCK O_NONBLOCK
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/* Returns a file descriptor that refers to the process PID. The
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close-on-exec is set on the file descriptor.
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The FLAGS argument is reserved for future use, it must be specified
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as 0. */
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extern int pidfd_open (__pid_t __pid, unsigned int __flags) __THROW;
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/* Duplicates an existing file descriptor TARGETFD in the process referred
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by the PIDFD file descriptor PIDFD.
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The FLAGS argument is reserved for future use, it must be specified
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as 0. */
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extern int pidfd_getfd (int __pidfd, int __targetfd,
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unsigned int __flags) __THROW;
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/* Sends the signal SIG to the target process referred by the PIDFD. If
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INFO points to a siginfo_t buffer, it will be populated.
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The FLAGS argument is reserved for future use, it must be specified
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as 0. */
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extern int pidfd_send_signal (int __pidfd, int __sig, siginfo_t *__info,
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unsigned int __flags) __THROW;
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#endif /* _PIDFD_H */
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