NAME

       killpg - send signal to a process group

SYNOPSIS

       #include <signal.h>

       int killpg(int pgrp, int sig);

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

       killpg():
           _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

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 a process to have permission to send a signal it must either be privileged  (under  Linux:  have  the
       CAP_KILL  capability),  or  the  real  or effective user ID of the sending process must equal the real or
       saved set-user-ID of the target process.  In the case  of  SIGCONT  it  suffices  when  the  sending  and
       receiving processes belong to the same session.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

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.

       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.

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (killpg() first appeared in 4BSD).

NOTES

       There  are  various  differences  between  the  permission checking in BSD-type systems and System V-type
       systems.  See the POSIX rationale for kill().  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).

SEE ALSO

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

COLOPHON

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Linux                                              2015-07-23                                          KILLPG(2)