killpg man page on 4.4BSD

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KILLPG(2)		    BSD System Calls Manual		     KILLPG(2)

     killpg — send signal to a process group

     #include <signal.h>

     killpg(pid_t pgrp, int sig);

     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.

     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

     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.

     kill(2), getpgrp(2), sigaction(2)

     The killpg function call appeared in 4.0BSD.

4th Berkeley Distribution	 June 2, 1993	     4th Berkeley Distribution

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