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RedHat 9 (Linux i386) - man page for sched_getparam (redhat section 2)

SCHED_SETPARAM(2)		    Linux Programmer's Manual			SCHED_SETPARAM(2)

NAME
       sched_setparam, sched_getparam - set and get scheduling parameters

SYNOPSIS
       #include <sched.h>

       int sched_setparam(pid_t pid, const struct sched_param *p);

       int sched_getparam(pid_t pid, struct sched_param *p);

       struct sched_param {
	   ...
	   int sched_priority;
	   ...
       };

DESCRIPTION
       sched_setparam  sets  the  scheduling parameters associated with the scheduling policy for
       the process identified by pid. If pid is zero, then the parameters of the current  process
       are  set. The interpretation of the parameter p depends on the selected policy. Currently,
       the following three scheduling policies are supported under Linux:  SCHED_FIFO,	SCHED_RR,
       and SCHED_OTHER.

       sched_getparam  retrieves  the scheduling parameters for the process identified by pid. If
       pid is zero, then the parameters of the current process are retrieved.

       sched_setparam checks the validity of p for the scheduling  policy  of  the  process.  The
       parameter  p->sched_priority must lie within the range given by sched_get_priority_min and
       sched_get_priority_max.

       POSIX systems on which sched_setparam and sched_getparam are available define  _POSIX_PRI-
       ORITY_SCHEDULING in <unistd.h>.

RETURN VALUE
       On  success,  sched_setparam and sched_getparam return 0.  On error, -1 is returned, errno
       is set appropriately.

ERRORS
       ESRCH  The process whose ID is pid could not be found.

       EPERM  The calling process does not  have  appropriate  privileges.  The  process  calling
	      sched_setparam needs an effective uid equal to the euid or uid of the process iden-
	      tified by pid, or it must be a superuser process.

       EINVAL The parameter p does not make sense for the current scheduling policy.

CONFORMING TO
       POSIX.1b (formerly POSIX.4)

SEE ALSO
       sched_setscheduler(2), sched_getscheduler(2), sched_get_priority_max(2),  sched_get_prior-
       ity_min(2), nice(2), setpriority(2), getpriority(2),

       sched_setscheduler(2) has a description of the Linux scheduling scheme.

       Programming  for  the  real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates,
       Inc., ISBN 1-56592-074-0
       IEEE Std 1003.1b-1993 (POSIX.1b standard)
       ISO/IEC 9945-1:1996

Linux 1.3.81				    1996-04-10				SCHED_SETPARAM(2)


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