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Man Sections:Commands (1)System Calls (2)Library Functions (3)Device Drivers (4)File Formats (5)Miscellaneous (7)System Utilities (8)
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  __syscall(2)
  _exit(2)
  accept(2)
  access(2)
  acct(2)
  adjtime(2)
  aio_cancel(2)
  aio_error(2)
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  fchdir(2)
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  flock(2)
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  i386_get_ioperm(2)
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  intro(2)
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  kenv(2)
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  kse(2)
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  ntp_adjtime(2)
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  open(2)
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  posix_madvise(2)
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  rename(2)
  revoke(2)
  rfork(2)
  rmdir(2)
  rtprio(2)
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  sched_get_priority_max(2)
  sched_get_priority_min(2)
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  vfork(2)
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  wait4(2)
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  write(2)
  writev(2)

rtprio(2)

NAME

     rtprio -- examine or modify a process realtime or idle priority


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <sys/types.h>
     #include <sys/rtprio.h>

     int
     rtprio(int function, pid_t pid, struct rtprio *rtp);


DESCRIPTION

     The rtprio() system call is used to lookup or change the realtime or idle
     priority of a process.

     The function argument specifies the operation to be performed.
     RTP_LOOKUP to lookup the current priority, and RTP_SET to set the prior-
     ity.  The pid argument specifies the process to be used, 0 for the cur-
     rent process.

     The *rtp argument is a pointer to a struct rtprio which is used to spec-
     ify the priority and priority type.  This structure has the following
     form:

     struct rtprio {
	     u_short type;
	     u_short prio;
     };

     The value of the type field may be RTP_PRIO_REALTIME for realtime priori-
     ties, RTP_PRIO_NORMAL for normal priorities, and RTP_PRIO_IDLE for idle
     priorities.  The priority specified by the prio field ranges between 0
     and RTP_PRIO_MAX (usually 31).  0 is the highest possible priority.

     Realtime and idle priority is inherited through fork() and exec().

     A realtime process can only be preempted by a process of equal or higher
     priority, or by an interrupt; idle priority processes will run only when
     no other real/normal priority process is runnable.  Higher real/idle pri-
     ority processes preempt lower real/idle priority processes.  Processes of
     equal real/idle priority are run round-robin.


RETURN VALUES

     The rtprio() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.


ERRORS

     The rtprio() system call will fail if

     [EINVAL]		The specified prio was out of range.

     [EPERM]		The calling process is not allowed to set the realtime
			priority.  Only root is allowed to change the realtime
			priority of any process, and non-root may only change


SEE ALSO

     nice(1), ps(1), rtprio(1), setpriority(2), nice(3), renice(8)

FreeBSD 5.4			 July 23, 1994			   FreeBSD 5.4

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