NAME
killpg —
send signal to a process
group
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
int
killpg(
pid_t
pgrp,
int sig);
DESCRIPTION
killpg() 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
Upon successful completion, a value of 0 is returned. Otherwise, a value of -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 super-user and one or more
of the target processes has an effective user ID different from that of
the sending process.
SEE ALSO
getpgrp(2),
kill(2),
sigaction(2)
HISTORY
The
killpg() function call appeared in
4.0BSD.