setpgid(2)                 DG/UX 4.30                  setpgid(2)



     NAME
          setpgid - Set process group ID for job control.

     SYNOPSIS
          #include <sys/types.h>

          int setpgid (pid, pgid)
          pid_t pid, pgid;

     DESCRIPTION
          If {_POSIX_JOB_CONTROL} is defined:

               The setpgid() function is used to either join an
               existing process group or create a new process group
               within the session of the calling process.  The process
               group ID of a session leader shall not change.  Upon
               successful completion, the process group ID of the
               process with a process ID that matches pid shall be set
               to pgid.  As a special case, if pid is zero, the
               process ID of the calling process shall be used.  Also,
               if pgid is zero, the process ID of the indicated
               process shall be used.

          Otherwise:

               Either the implementation shall support the setpgid()
               function as described above or the setpgid() function
               shall fail.

     RETURNS
          Upon successful completion, the setpgid() function returns a
          value of zero.  Otherwise, a value of -1 is returned and
          errno is set to indicate the error.

     ERRORS
          If any of the following conditions occur, the setpgid()
          function shall return -1 and set errno to the corresponding
          value:

          [EACCES]
               The value of 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()
               functions.

          [EINVAL]
               The value of the pgid argument is less than zero or is
               not a value supported by the implementation.

          [ENOSYS]
               The setpgid() function is not supported by this
               implementation.



     Licensed material--property of copyright holder(s)         Page 1

     setpgid(2)                 DG/UX 4.30                  setpgid(2)



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

               The value of the pid argument is valid but 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.

               The value of 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 the value of the pgid argument in the same
               session as the calling process.

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

     SEE ALSO
          getpgrp(2), setsid(2), tcsetpgrp(3), exec(2)

     COPYRIGHTS
          Portions of this text are reprinted from IEEE Std 1003.1-
          1988, Portable Operating System Interface for Computer
          Environment, copyright © 1988 by the Institute of Electrical
          and Electronics Engineers, Inc., with the permission of the
          IEEE Standards Department.  To purchase IEEE Standards, call
          800/678-IEEE.

          In the event of a discrepancy between the electronic and the
          original printed version, the original version takes
          precedence.

     STANDARDS
          The setpgid() always behaves as if _POSIX_JOB_CONTROL were
          defined, regardless of whether or not it is defined.

















     Licensed material--property of copyright holder(s)         Page 2