setpgid(2) [freebsd man page]

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

setpgid(2)							   System Calls 							setpgid(2)

NAME

       setpgid - set process group ID

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       int setpgid(pid_t pid, pid_t pgid);

DESCRIPTION

       The setpgid() function sets the process group ID of the process with ID pid to pgid.

       If pgid is equal to pid, the process becomes a process group leader. See intro(2) for more information on session leaders and process group
       leaders.

       If pgid is not equal to pid, the process becomes a member of an existing process group.

       If pid is equal to 0, the process ID of the calling process is used. If pgid is equal to 0, the process specified by pid becomes a  process
       group leader.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The setpgid() function will fail if:

       EACCES	       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 family of functions (see exec(2)).

       EINVAL	       The pgid argument is less than (pid_t) 0 or greater than or equal to PID_MAX, or the calling process has a controlling ter-
		       minal that does not support job control.

       EPERM	       The process indicated by the pid argument is a session leader.

       EPERM	       The  pid argument matches the process ID of a child process of the calling process and the child process is not in the same
		       session as the calling process.

       EPERM	       The pgid argument does not match the process ID of the process indicated by the pid argument, and there is no process  with
		       a process group ID that matches pgid in the same session as the calling process.

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

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       intro(2), exec(2), exit(2), fork(2), getpid(2), getsid(2), attributes(5), standards(5)

SunOS 5.10							    28 Dec 1996 							setpgid(2)