killpg - send signal to a process group
killpg(pid_t pgrp, int sig);
killpg() sends the signal sig to the process group pgrp.
sigaction(2) for a list of signals. If pgrp is 0, killpg()
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 that is
a descendant of the current process.
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and the global variable errno is set to
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
[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
from that of the sending process.
getpgrp(2), kill(2), sigaction(2)
The killpg() function call appeared in 4.0BSD.
OpenBSD 3.6 March 10, 1991
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