Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- send a signal to a process group
int killpg(pid_t pgrp, int sig);
function shall send the signal specified by
to the process group specified by
is greater than 1, killpg(pgrp, sig) shall be
equivalent to kill(-pgrp, sig). If
is less than or equal to 1, the behavior of
The following sections are informative.
Sending a Signal to All Other Members of a Process Group
The following example shows how the calling process could send a signal
to all other members of its process group. To prevent itself from
receiving the signal it first makes itself immune to the signal by
if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
/* Handle error */;
if (killpg(getpgrp(), SIGUSR1) == -1)
/* Handle error */;"
The Base Definitions volume of POSIX.1-2017,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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