setpgrp - set process group ID
#include <unistd.h> pid_t setpgrp(void);
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() returns the process group ID.
No errors are defined.
exec, fork(), getpid(), getsid(), kill(), setsid(), <unistd.h>.