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 .