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.
killpg — send a signal to a process group
int killpg(pid_t pgrp, int sig);
The killpg() function shall send the signal specified by sig to the process group specified by pgrp.
If pgrp is greater than 1, killpg(pgrp, sig) shall be equivalent to kill(−pgrp, sig). If pgrp is less than or equal to 1, the behavior of killpg() is undefined.
Refer to kill().
The following sections are informative.
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 ignoring it.
getpgid(), getpid(), kill(), raise()
The Base Definitions volume of POSIX.1‐2008, <signal.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 http://www.unix.org/online.html .
if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
/* Handle error */;
if (killpg(getpgrp(), SIGUSR1) == −1) /* Handle error */;"
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