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 by param.
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
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 pid.
The following sections are informative.
sched_getscheduler() , sched_setparam() ,
sched_setscheduler() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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