setpgid(2)                                                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
             setpgid 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.  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
             On success, setpgid returns 0.  On failure, setpgid returns -1
             and sets errno to identify the error.

          Errors
             In the following conditions, setpgid fails and sets errno to:

             EACCES         pid matches the process ID of a child process
                            of the calling process and the child process
                            has successfully executed an exec(2) function.

             EBUSY          pgid is associated with another process group.

             EINVAL         pgid is less than (pid_t) 0, or greater than or
                            equal to {PID_MAX}.

             EINVAL         The calling process has a controlling terminal
                            that does not support job control.

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

             EPERM          pid 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.





                           Copyright 1994 Novell, Inc.               Page 1

      setpgid(2)                                                setpgid(2)


            EPERM          pgid 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          pid does not match the process ID of the
                           calling process or of a child process of the
                           calling process.

      REFERENCES
            exec(2), exit(2), fork(2), getpid(2), setsid(2)

      NOTICES
         Considerations for Threads Programming
            This ID number is an attribute of the containing process and
            is shared by sibling threads.































                          Copyright 1994 Novell, Inc.               Page 2