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.
sched_getscheduler — get scheduling policy ( REALTIME)
int sched_getscheduler(pid_t pid);
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.
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.
The sched_getscheduler() function shall fail if:
- The requesting process does not have permission to determine the scheduling policy of the specified process.
The following sections are informative.
sched_getparam(), sched_setparam(), sched_setscheduler()
The Base Definitions volume of POSIX.1‐2008, <sched.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
- No process can be found corresponding to that specified by pid.
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