Why process leader can not call setsid() Post: 27892

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setpgrp

setpgrp(2)							System Calls Manual							setpgrp(2)

NAME

       setpgrp - set process group ID

SYNOPSIS

DESCRIPTION

       If  the	calling process is not already a session leader, sets the process group ID of the calling process to the process ID of the calling
       process.  If creates a new session, then the new session has no controlling terminal.

       The function has no effect when the calling process is a session leader.

   Security Restrictions
       Some or all of the actions associated with this system call may require privileges.  See privileges(5) for more information.

RETURN VALUE

       Upon successful completion, returns the new process group ID.

ERRORS

       If fails, no changes occur and (see errno(2)) is set to one of the following values:

	      The calling process is already a process group leader or
			     the process group ID of a process other than the calling process matches the process ID of the calling process.

	      The calling process does not have sufficient privileges.

SEE ALSO

       exec(2), fork(2), getpid(2), getsid(2), kill(2), setpgrp3(2), setsid(2), privileges(5), <unistd.h>.

STANDARDS CONFORMANCE

																	setpgrp(2)