NAME
killpg —
send signal to a process
group
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <signal.h>
int
killpg(pid_t
pgrp, int sig);
DESCRIPTION
Thekillpg()
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 super-user. As a single
special case the continue signal SIGCONT may be sent
to any process that is a descendant of the current process.
RETURN VALUES
The killpg() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
error.
ERRORS
The killpg() function will fail and no
signal will be sent if:
- [
EINVAL] - The sig argument 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 super-user and one or more of the target processes has an effective user ID different from that of the sending process.
SEE ALSO
HISTORY
The killpg() function appeared in
4.0BSD.