setpgrp(2) [ultrix man page]

setpgrp(2)							System Calls Manual							setpgrp(2)

Name
       setpgrp - set process group

Syntax
       setpgrp(pid, pgrp)
       int pid, pgrp;

Description
       The system call sets the process group of the specified process pid to the specified pgrp.  If pid is zero, the call applies to the current
       process.

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

Return Values
       The  system  call  returns  zero (0) when the operation is successful.  If the request fails, -1 is returned, and the global variable errno
       indicates the reason.

Environment
       SYSTEM_FIVE

       When your program is compiled using the System V environment, is called without arguments and the new process group id is returned if  suc-
       cessful.

Diagnostics
       The system call fails and the process group is not altered, if one of the following occur:

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

       [ESRCH]	      The requested process does not exist.

See Also
       getpgrp(2)

																	setpgrp(2)

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

NAME

     setpgid, setpgrp -- set process group

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     setpgid(pid_t pid, pid_t pgrp);

     int
     setpgrp(pid_t pid, pid_t pgrp);

DESCRIPTION

     The setpgid() system call 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 pgrp is zero, then the process id of the process specified by pid is used instead.

     If the affected process is not the invoking process, then it must be a child of the invoking process, it must not have performed an exec(3)
     operation, and both processes must be in the same session.  The requested process group ID must already exist in the session of the caller,
     or it must be equal to the target process ID.

RETURN VALUES

     The setpgid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

COMPATIBILITY

     The setpgrp() system call is identical to setpgid(), and is retained for calling convention compatibility with historical versions of BSD.

ERRORS

     The setpgid() system call will fail and the process group will not be altered if:

     [EINVAL]		The requested process group ID is not legal.

     [ESRCH]		The requested process does not exist.

     [ESRCH]		The target process is not the calling process or a child of the calling process.

     [EACCES]		The requested process is a child of the calling process, but it has performed an exec(3) operation.

     [EPERM]		The target process is a session leader.

     [EPERM]		The requested process group ID is not in the session of the caller, and it is not equal to the process ID of the target
			process.

SEE ALSO

     getpgrp(2)

STANDARDS

     The setpgid() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD
								 February 8, 2004							       BSD