SCHED_GETSCHEDULER(3P)                              POSIX Programmer's Manual                             SCHED_GETSCHEDULER(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       sched_getscheduler - get scheduling policy (REALTIME)

SYNOPSIS
       #include <sched.h>

       int sched_getscheduler(pid_t pid);


DESCRIPTION
       The sched_getscheduler() function shall return the scheduling policy of the process specified by pid. If the value of pid
       is negative, the behavior of the sched_getscheduler() function is unspecified.

       The values that can be returned by sched_getscheduler() are defined in the <sched.h> header.

       If a process specified by pid exists, and if the calling process has permission, the scheduling policy shall be  returned
       for the process whose process ID is equal to pid.

       If pid is zero, the scheduling policy shall be returned for the calling process.

RETURN VALUE
       Upon  successful  completion,  the  sched_getscheduler()  function  shall  return  the scheduling policy of the specified
       process. If unsuccessful, the function shall return -1 and set errno to indicate the error.

ERRORS
       The sched_getscheduler() function shall fail if:

       EPERM  The requesting process does not have permission to determine the scheduling policy of the specified process.

       ESRCH  No process can be found corresponding to that specified by pid.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       sched_getparam(), sched_setparam(), sched_setscheduler(), the Base Definitions volume of IEEE Std 1003.1-2001, <sched.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                        SCHED_GETSCHEDULER(3P)