killpg(2)

1KILLPG(2)                  Linux Programmer's Manual                 KILLPG(2)
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NAME

6       killpg - send signal to a process group
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SYNOPSIS

9       #include <signal.h>
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11       int killpg(int pgrp, int sig);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       killpg(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
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DESCRIPTION

18       killpg() sends the signal sig to the process group pgrp.  See signal(7)
19       for a list of signals.
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21       If pgrp is 0, killpg()  sends  the  signal  to  the  calling  process's
22       process  group.   (POSIX  says: If pgrp is less than or equal to 1, the
23       behavior is undefined.)
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25       For a process to have permission to send a signal  it  must  either  be
26       privileged  (under Linux: have the CAP_KILL capability), or the real or
27       effective user ID of the sending process must equal the real  or  saved
28       set-user-ID  of the target process.  In the case of SIGCONT it suffices
29       when the sending and receiving processes belong to the same session.
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RETURN VALUE

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

36       EINVAL Sig is not a valid signal number.
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38       EPERM  The  process  does not have permission to send the signal to any
39              of the target processes.
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41       ESRCH  No process can be found in the process group specified by pgrp.
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43       ESRCH  The process group was given as 0 but the  sending  process  does
44              not have a process group.
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CONFORMING TO

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

51       There are various differences between the permission checking  in  BSD-
52       type  systems  and  System V-type systems.  See the POSIX rationale for
53       kill().  A difference not mentioned by POSIX concerns the return  value
54       EPERM: BSD documents that no signal is sent and EPERM returned when the
55       permission check failed for at least one target  process,  while  POSIX
56       documents  EPERM  only  when the permission check failed for all target
57       processes.
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59       On Linux, killpg() is implemented as a library function that makes  the
60       call kill(-pgrp, sig).
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COLOPHON

66       This  page  is  part of release 3.22 of the Linux man-pages project.  A
67       description of the project, and information about reporting  bugs,  can
68       be found at http://www.kernel.org/doc/man-pages/.
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72Linux                             2007-07-26                         KILLPG(2)