setpgid(2)                                                       setpgid(2)


   NAME
         setpgid - set process group ID

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

         int setpgid(pidt pid, pidt 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.

         setpgid fails and returns an error if one or more of the following
         are true:

         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.

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

         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.

         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.

   SEE ALSO
         exec(2), exit(2), fork(2), getpid(2), getpgid(2), setsid(2).




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   setpgid(2)                                                       setpgid(2)


   DIAGNOSTICS
         Upon successful completion, setpgid returns a value of 0.  Otherwise,
         a value of -1 is returned and errno is set to indicate the error.


















































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