man3/killpg.3

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  34 .\"     @(#)killpg.2    6.5 (Berkeley) 3/10/91
  35 .\"
  36 .\" Modified Fri Jul 23 21:55:01 1993 by Rik Faith <faith@cs.unc.edu>
  37 .\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
  38 .\" Modified 2004-06-16 by Michael Kerrisk <mtk.manpages@gmail.com>
  39 .\"     Added notes on CAP_KILL
  40 .\" Modified 2004-06-21 by aeb
  41 .\"
  42 .TH KILLPG 3 2017-09-15 "Linux" "Linux Programmer's Manual"
  43 .SH NAME
  44 killpg \- send signal to a process group
  45 .SH SYNOPSIS
  46 .B #include <signal.h>
  47 .PP
  48 .BI "int killpg(int " pgrp ", int " sig );
  49 .PP
  50 .in -4n
  51 Feature Test Macro Requirements for glibc (see
  52 .BR feature_test_macros (7)):
  53 .in
  54 .ad l
  55 .TP 4
  56 .BR killpg ():
  57 _XOPEN_SOURCE\ >=\ 500
  58 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
  59     || /* Since glibc 2.19: */ _DEFAULT_SOURCE
  60     || /* Glibc versions <= 2.19: */ _BSD_SOURCE
  61 .ad
  62 .SH DESCRIPTION
  63 .BR killpg ()
  64 sends the signal
  65 .I sig
  66 to the process group
  67 .IR pgrp .
  68 See
  69 .BR signal (7)
  70 for a list of signals.
  71 .PP
  72 If
  73 .I pgrp
  74 is 0,
  75 .BR killpg ()
  76 sends the signal to the calling process's process group.
  77 (POSIX says: if
  78 .I pgrp
  79 is less than or equal to 1, the behavior is undefined.)
  80 .PP
  81 For the permissions required to send a signal to another process, see
  82 .BR kill (2).
  83 .SH RETURN VALUE
  84 On success, zero is returned.
  85 On error, \-1 is returned, and
  86 .I errno
  87 is set appropriately.
  88 .SH ERRORS
  89 .TP
  90 .B EINVAL
  91 .I sig
  92 is not a valid signal number.
  93 .TP
  94 .B EPERM
  95 The process does not have permission to send the signal
  96 to any of the target processes.
  97 For the required permissions, see
  98 .BR kill (2).
  99 .TP
 100 .B ESRCH
 101 No process can be found in the process group specified by
 102 .IR pgrp .
 103 .TP
 104 .B ESRCH
 105 The process group was given as 0 but the sending process does not
 106 have a process group.
 107 .SH CONFORMING TO
 108 POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD
 109 .RB ( killpg ()
 110 first appeared in 4BSD).
 111 .SH NOTES
 112 There are various differences between the permission checking
 113 in BSD-type systems and System\ V-type systems.
 114 See the POSIX rationale for
 115 .BR kill (3p).
 116 A difference not mentioned by POSIX concerns the return
 117 value
 118 .BR EPERM :
 119 BSD documents that no signal is sent and
 120 .B EPERM
 121 returned when the permission check failed for at least one target process,
 122 while POSIX documents
 123 .B EPERM
 124 only when the permission check failed for all target processes.
 125 .SS C library/kernel differences
 126 On Linux,
 127 .BR killpg ()
 128 is implemented as a library function that makes the call
 129 .IR "kill(-pgrp,\ sig)" .
 130 .SH SEE ALSO
 131 .BR getpgrp (2),
 132 .BR kill (2),
 133 .BR signal (2),
 134 .BR capabilities (7),
 135 .BR credentials (7)