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NAME

       sched_rr_get_interval   -  get  the  SCHED_RR  interval  for  the named
       process

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.1b (formerly POSIX.4)

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
       properly.

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
       IEEE Std 1003.1b-1993 (POSIX.1b standard, formerly POSIX.4)
       ISO/IEC 9945-1:1996