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_getparam — get scheduling parameters (REALTIME)
int sched_getparam(pid_t pid, struct sched_param *param);
The sched_getparam() function shall return the scheduling parameters of a
process specified by pid in the sched_param structure pointed to
If a process specified by pid exists, and if the calling
process has permission, the scheduling parameters for the process whose
process ID is equal to pid shall be returned.
If pid is zero, the scheduling parameters for the calling
process shall be returned. The behavior of the sched_getparam()
function is unspecified if the value of pid is negative.
Upon successful completion, the sched_getparam() function shall return
zero. If the call to sched_getparam() is unsuccessful, the function
shall return a value of -1 and set errno to indicate the error.
The sched_getparam() function shall fail if:
- The requesting process does not have permission to obtain the scheduling
parameters of the specified process.
- No process can be found corresponding to that specified by
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017,
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 .
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