RR_GET_INTERVAL(2)         Linux Programmer's Manual        RR_GET_INTERVAL(2)
NAME
       sched_rr_get_interval   -  get the SCHED_RR interval for the named pro-
       cess

SYNOPSIS
       #include <sched.h>

       int sched_rr_get_interval(pid_t pid, struct timespec *tp);

       struct timespec {
           time_t  tv_sec;     /* seconds */
           long    tv_nsec;    /* nanoseconds */
       };

DESCRIPTION
       sched_rr_get_interval() writes into the timespec structure  pointed  to
       by  tp  the round robin time quantum for the process identified by pid.
       If pid is zero, the time quantum for the  calling  process  is  written
       into  *tp.  The identified process should be running under the SCHED_RR
       scheduling policy.

       The round robin time quantum value is not alterable under Linux 1.3.81.

       POSIX  systems  on  which  sched_rr_get_interval()  is available define
       _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

RETURN VALUE
       On  success,  sched_rr_get_interval()  returns  0.   On  error,  -1  is
       returned, and errno is set appropriately.

ERRORS
       EFAULT Problem with copying information to userspace.

       EINVAL Invalid pid.

       ENOSYS The system call is not yet implemented.

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

CONFORMING TO
       POSIX.1-2001.

BUGS
       As  of  Linux 1.3.81 sched_rr_get_interval() returns with error ENOSYS,
       because SCHED_RR has not yet been fully implemented  and  tested  prop-
       erly.

SEE ALSO
       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

Linux 1.3.81                      1996-04-10                RR_GET_INTERVAL(2)