setpgrp - set the process group ID
If the calling process is not already a session leader, setpgrp() sets the process group ID of the calling process to the process ID of the calling process. If setpgrp() creates a new session, then the new session has no controlling terminal.
The setpgrp() function has no effect when the calling process is a session leader.
Upon completion, setpgrp() shall return the process group ID.
No errors are defined.
exec(), fork(), getpid(), getsid(), kill(), setpgid(), setsid(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
First released in Issue 4, Version 2.
Moved from X/OPEN UNIX extension to BASE.