killpg(3) — Linux manual page

killpg(3)               Library Functions Manual               killpg(3)

NAME

       killpg - send signal to a process group

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <signal.h>

       int killpg(int pgrp, int sig);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       killpg():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE

DESCRIPTION

       killpg() sends the signal sig to the process group pgrp.  See
       signal(7) for a list of signals.

       If pgrp is 0, killpg() sends the signal to the calling process's
       process group.  (POSIX says: if pgrp is less than or equal to 1,
       the behavior is undefined.)

       For the permissions required to send a signal to another process,
       see kill(2).

RETURN VALUE

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

ERRORS

       EINVAL sig is not a valid signal number.

       EPERM  The process does not have permission to send the signal to
              any of the target processes.  For the required
              permissions, see kill(2).

       ESRCH  No process can be found in the process group specified by
              pgrp.

       ESRCH  The process group was given as 0 but the sending process
              does not have a process group.

VERSIONS

       There are various differences between the permission checking in
       BSD-type systems and System V-type systems.  See the POSIX
       rationale for kill(3p).  A difference not mentioned by POSIX
       concerns the return value EPERM: BSD documents that no signal is
       sent and EPERM returned when the permission check failed for at
       least one target process, while POSIX documents EPERM only when
       the permission check failed for all target processes.

   C library/kernel differences
       On Linux, killpg() is implemented as a library function that
       makes the call kill(-pgrp, sig).

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, SVr4, 4.4BSD (first appeared in 4BSD).

SEE ALSO

       getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                      killpg(3)

Pages that refer to this page: kill(2), sigaction(2), signal(2), credentials(7), signal(7)

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