opendarwin man page for setpgid

SETPGID(2)						      BSD System Calls Manual							SETPGID(2)

NAME
     setpgid, setpgrp -- set process group

SYNOPSIS
     #include <unistd.h>

     int
     setpgid(pid_t pid, pid_t pgrp);

     int
     setpgrp(pid_t pid, pid_t pgrp);

DESCRIPTION
     Setpgid() sets the process group of the specified process pid to the specified pgrp.  If pid is zero, then the call applies to the current
     process.

     If the invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the
     invoking process.

RETURN VALUES
     Setpgid() returns 0 when the operation was successful.  If the request failed, -1 is returned and the global variable errno indicates the
     reason.

ERRORS
     Setpgid() will fail and the process group will not be altered if:

     [EACCES]		The value of the pid argument matches the process ID of a child process of the calling process, and the child process has
			successfully executed one of the exec functions.

     [EPERM]		The effective user ID of the requested process is different from that of the caller and the process is not a descendant of
			the calling process.

     [ESRCH]		The value of the pid argument does not match the process ID of the calling process or of a child process of the calling
			process.

SEE ALSO
     getpgrp(2)

STANDARDS
     The setpgid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

COMPATIBILITY
     Setpgrp() is identical to setpgid(), and is retained for calling convention compatibility with historical versions of BSD.

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