getpriority(3BSD)    (BSD System Compatibility)    getpriority(3BSD)


       NAME
             getpriority, setpriority - (BSD) get/set program scheduling
             priority

       SYNOPSIS
             /usr/ucb/cc [flag . . . ] file . . .
             #include <sys/time.h>
             #include <sys/resource.h>
             int getpriority(int which, int who);
             int setpriority(int which, int who, int prio);

       DESCRIPTION
             The scheduling priority of the process, process group, or
             user, as indicated by which and who is obtained with
             getpriority and set with setpriority The default priority is
             0; lower priorities cause more favorable scheduling.

             which is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and who
             is interpreted relative to which (a process identifier for
             PRIO_PROCESS, process group identifier for PRIO_PGRP, and a
             user ID for PRIO_USER).  A zero value of who denotes the
             current process, process group, or user.

             getpriority returns the highest priority (lowest numerical
             value) enjoyed by any of the specified processes.  setpriority
             sets the priorities of all of the specified processes to the
             value specified by prio.  If prio is less than -20, a value of
             -20 is used; if it is greater than 20, a value of 20 is used.
             Only the privileged user may lower priorities.

       RETURN VALUE
             Since getpriority can legitimately return the value -1, it is
             necessary to clear the external variable errno prior to the
             call, then check it afterward to determine if a -1 is an error
             or a legitimate value.  The setpriority call returns 0 if
             there is no error, or -1 if there is.

       ERRORS
             getpriority and setpriority may return one of the following
             errors:

             ESRCH     No process was located using the which and who
                       values specified.





                           Copyright 1994 Novell, Inc.               Page 1

      getpriority(3BSD)    (BSD System Compatibility)    getpriority(3BSD)


            EINVAL    which was not one of PRIO_PROCESS, PRIO_PGRP, or
                      PRIO_USER.

            In addition to the errors indicated above, setpriority may
            fail with one of the following errors returned:

            EPERM     A process was located, but one of the following is
                      true:

                            Neither its effective nor real user ID matched
                            the effective user ID of the caller, and
                            neither the effective nor the real user ID of
                            the process executing the setpriority was the
                            privileged user.

                            The call to getpriority would have changed a
                            process' priority to a value lower than its
                            current value, and the effective user ID of
                            the process executing the call was not that of
                            the privileged user.

      REFERENCES
            fork(2), nice(1), renice(1), renice(1M_BSD)

      NOTICES
            It is not possible for the process executing setpriority to
            lower any other process down to its current priority, without
            requiring privileged user privileges.




















                          Copyright 1994 Novell, Inc.               Page 2