PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult 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 POSIX.1‐2017, <sched.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .