BSD 2.11 - man page for getpriority (bsd section 2)

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       getpriority, setpriority - get/set program scheduling priority

       #include <sys/resource.h>

       prio = getpriority(which, who)
       int prio, which, who;

       setpriority(which, who, prio)
       int which, who, prio;

       The  scheduling priority of the process, process group, or user, as indicated by which and
       who is obtained with the getpriority call and set with the setpriority call.  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.
       Prio is a value in the range -20 to 20.	The default priority is 0; lower priorities cause
       more favorable scheduling.

       The  getpriority call returns the highest priority (lowest numerical value) enjoyed by any
       of the specified processes.  The setpriority call sets the priorities of all of the speci-
       fied processes to the specified value.  Only the super-user may lower priorities.

       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.

       Getpriority and setpriority may return one of the following errors:

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

       [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 neither its effective nor real user ID matched
		      the effective user ID of the caller.

       [EACCES]       A non super-user attempted to lower a process priority.

       nice(1), fork(2), renice(8)

4th Berkeley Distribution		   May 22, 1986 			   GETPRIORITY(2)
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