PR_SET_PDEATHSIG(2const) — Linux manual page


PR_SET_PDEATHSIG(2const)                        PR_SET_PDEATHSIG(2const)

NAME         top

       PR_SET_PDEATHSIG - set the parent-death signal of the calling

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <linux/prctl.h>  /* Definition of PR_* constants */
       #include <sys/prctl.h>

       int prctl(PR_SET_PDEATHSIG, long sig);

DESCRIPTION         top

       Set the parent-death signal of the calling process to sig (either
       a signal value in the range [1, NSIG - 1], or 0 to clear).  This
       is the signal that the calling process will get when its parent

       The parent-death signal is sent upon subsequent termination of
       the parent thread and also upon termination of each subreaper
       process (see PR_SET_CHILD_SUBREAPER(2const)) to which the caller
       is subsequently reparented.  If the parent thread and all
       ancestor subreapers have already terminated by the time of the
       PR_SET_PDEATHSIG operation, then no parent-death signal is sent
       to the caller.

       The parent-death signal is process-directed (see signal(7)) and,
       if the child installs a handler using the sigaction(2) SA_SIGINFO
       flag, the si_pid field of the siginfo_t argument of the handler
       contains the PID of the terminating parent process.

       The parent-death signal setting is cleared for the child of a
       fork(2).  It is also (since Linux 2.4.36 / 2.6.23) cleared when
       executing a set-user-ID or set-group-ID binary, or a binary that
       has associated capabilities (see capabilities(7)); otherwise,
       this value is preserved across execve(2).  The parent-death
       signal setting is also cleared upon changes to any of the
       following thread credentials: effective user ID, effective group
       ID, filesystem user ID, or filesystem group ID.

RETURN VALUE         top

       On success, 0 is returned.  On error, -1 is returned, and errno
       is set to indicate the error.

ERRORS         top

       EINVAL sig is not a valid signal number.

STANDARDS         top


HISTORY         top

       Linux 2.1.57.

CAVEATS         top

       The "parent" in this case is considered to be the thread that
       created this process.  In other words, the signal will be sent
       when that thread terminates (via, for example, pthread_exit(3)),
       rather than after all of the threads in the parent process

SEE ALSO         top

       prctl(2), PR_GET_PDEATHSIG(2const)

COLOPHON         top

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Linux man-pages 6.9.1          2024-06-02       PR_SET_PDEATHSIG(2const)

Pages that refer to this page: prctl(2)PR_GET_PDEATHSIG(2const)