setpgrp - set process group ID

Syntax

#include <unistd.h> pid_t setpgrp (void);

Description  If the calling process is not already a session leader, setpgrp() sets the process group ID

	and the session number of the calling process to the process ID of the calling process and releases the controlling terminal of the calling process. The function does not have any effect if the calling process is a session leader.
Return val. See also	setpgrp() returns the value of the new process group ID. exec, fork(), getpid(), getsid(), kill(), setsid(), unistd.h.