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



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

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

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.

       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
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2007-07-26                         KILLPG(2)