sched_getscheduler(3p) — Linux manual page

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 (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(3p), sched_setparam(3p), sched_setscheduler(3p)

       The Base Definitions volume of POSIX.1‐2017, sched.h(0p)

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 .

IEEE/The Open Group               2017            SCHED_GETSCHEDULER(3P)

Pages that refer to this page: sched.h(0p), pthread_getschedparam(3p), sched_getparam(3p), sched_get_priority_max(3p), sched_rr_get_interval(3p), sched_setparam(3p), sched_setscheduler(3p)

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