NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

KILLPG(2)                 Linux Programmer's Manual                KILLPG(2)

NAME         top

       killpg - send signal to a process group

SYNOPSIS         top

       #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 versions <= 2.19: */ _BSD_SOURCE

DESCRIPTION         top

       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         top

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

ERRORS         top

       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         top

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

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 4.07 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

Linux                            2016-03-15                        KILLPG(2)