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SETPGID(2)		       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 spec-
     ified 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) opera-
     tion, 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 al-
     tered 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").

FreeBSD ports 15.quarterly	February 8, 2004		      SETPGID(2)

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