BSD 2.11 - man page for killpg (bsd section 2)
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killpg - send signal to a process group
int pgrp, sig;
Killpg sends the signal sig to the process group pgrp. See sigvec(2) for a list of sig-
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 SIG-
CONT 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 indicate the error.
Killpg will fail and no signal will be sent if any of the following occur:
[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
[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
kill(2), getpgrp(2), sigvec(2)
4th Berkeley Distribution May 14, 1986 KILLPG(2)
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