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1 | .\" Copyright (c) 1980, 1991 Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
32 | .\" @(#)killpg.2 6.5 (Berkeley) 3/10/91 | |
33 | .\" | |
34 | .\" Modified Fri Jul 23 21:55:01 1993 by Rik Faith <faith@cs.unc.edu> | |
35 | .\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com> | |
305a0578 | 36 | .\" Modified 2004-06-16 by Michael Kerrisk <mtk-manpages@gmx.net> |
fea681da | 37 | .\" Added notes on CAP_KILL |
c13182ef | 38 | .\" Modified 2004-06-21 by aeb |
fea681da | 39 | .\" |
cc4615cc | 40 | .TH KILLPG 2 2007-07-26 "Linux" "Linux Programmer's Manual" |
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41 | .SH NAME |
42 | killpg \- send signal to a process group | |
43 | .SH SYNOPSIS | |
44 | .B #include <signal.h> | |
45 | .sp | |
46 | .BI "int killpg(int " pgrp ", int " sig ); | |
cc4615cc MK |
47 | .sp |
48 | .in -4n | |
49 | Feature Test Macro Requirements for glibc (see | |
50 | .BR feature_test_macros (7)): | |
51 | .in | |
52 | .sp | |
53 | .BR killpg (): | |
54 | _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 | |
fea681da | 55 | .SH DESCRIPTION |
7145b9a9 | 56 | .BR killpg () |
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57 | sends the signal |
58 | .I sig | |
59 | to the process group | |
60 | .IR pgrp . | |
61 | See | |
62 | .BR signal (7) | |
63 | for a list of signals. | |
7dbfafa8 | 64 | |
fea681da MK |
65 | If |
66 | .I pgrp | |
67 | is 0, | |
e511ffb6 | 68 | .BR killpg () |
7dbfafa8 | 69 | sends the signal to the calling process's process group. |
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70 | (POSIX says: If |
71 | .I pgrp | |
d9bfdb9c | 72 | is less than or equal to 1, the behavior is undefined.) |
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73 | |
74 | For a process to have permission to send a signal | |
75 | it must either be privileged (under Linux: have the | |
76 | .B CAP_KILL | |
77 | capability), or the real or effective | |
78 | user ID of the sending process must equal the real or | |
79 | saved set-user-ID of the target process. | |
8bd58774 MK |
80 | In the case of |
81 | .B SIGCONT | |
82 | it suffices when the sending and receiving | |
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83 | processes belong to the same session. |
84 | .SH "RETURN VALUE" | |
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85 | On success, zero is returned. |
86 | On error, \-1 is returned, and | |
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87 | .I errno |
88 | is set appropriately. | |
89 | .SH ERRORS | |
90 | .TP | |
91 | .B EINVAL | |
92 | .I Sig | |
93 | is not a valid signal number. | |
94 | .TP | |
95 | .B EPERM | |
96 | The process does not have permission to send the signal | |
97 | to any of the target processes. | |
98 | .TP | |
99 | .B ESRCH | |
100 | No process can be found in the process group specified by | |
101 | .IR pgrp . | |
102 | .TP | |
103 | .B ESRCH | |
104 | The process group was given as 0 but the sending process does not | |
105 | have a process group. | |
a1d5f77c | 106 | .SH "CONFORMING TO" |
7dbfafa8 | 107 | SVr4, 4.4BSD (the |
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108 | .BR killpg () |
109 | function call first appeared in 4BSD), POSIX.1-2001. | |
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110 | .SH NOTES |
111 | There are various differences between the permission checking | |
c13182ef | 112 | in BSD-type systems and System V-type systems. |
0bfa087b | 113 | See the POSIX rationale for |
7dbfafa8 | 114 | .BR kill (). |
b5cc2ffb | 115 | A difference not mentioned by POSIX concerns the return |
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116 | value |
117 | .BR EPERM : | |
118 | BSD documents that no signal is sent and | |
119 | .BR EPERM | |
120 | returned when the permission check failed for at least one target process, | |
121 | while POSIX documents | |
122 | .B EPERM | |
123 | only when the permission check failed for all target processes. | |
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124 | |
125 | On Linux, | |
126 | .BR killpg () | |
127 | is implemented as a library function that makes the call | |
128 | .IR "kill(-pgrp,\ sig)" . | |
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129 | .SH "SEE ALSO" |
130 | .BR getpgrp (2), | |
131 | .BR kill (2), | |
132 | .BR signal (2), | |
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133 | .BR capabilities (7), |
134 | .BR credentials (7) |