NAME
killpg —
send signal to a process
group
SYNOPSIS
#include
<signal.h>
int
killpg(pid_t
pgrp, int sig);
DESCRIPTION
The
killpg()
function sends the signal sig to the process group
pgrp. See
sigaction(2) for a list of signals. If pgrp is
0, killpg() sends the signal to the sending
process's process group.
The sending process and members of the process group must have the same effective user ID, or the sender must be the superuser. As a single special case the continue signal SIGCONT may be sent to any process with the same session ID as the caller.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
killpg() will fail and no signal will be
sent if:
- [
EINVAL] - sig is not a valid signal number.
- [
ESRCH] - No process can be found in the process group specified by pgrp.
- [
ESRCH] - The process group was given as 0 but the sending process does not have a process group.
- [
EPERM] - The sending process is not the superuser and one or more of the target processes has an effective user ID different from that of the sending process.
SEE ALSO
STANDARDS
The killpg() function conforms to the
X/Open System Interfaces option of the IEEE Std 1003.1-2008
(“POSIX.1”) specification.
The handling of process group 0 is an extension to that standard.
HISTORY
The killpg() function call appeared in
4.0BSD.