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Added RLIMIT_RTPRIO and RLIMIT_NICE

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Michael Kerrisk 2005-07-28 14:38:36 +00:00
parent fd04afa828
commit 1bf844f164
1 changed files with 32 additions and 5 deletions
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37
man2/getrlimit.2
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@ -55,11 +55,11 @@
.\" Rewrote discussion on RLIMIT_MEMLOCK to incorporate kernel
.\" 2.6.9 changes.
.\" Added note on RLIMIT_CPU error in older kernels
.\" 2004-11-03, mtk
.\" Added RLIMIT_SIGPENDING
.\" 2004-11-03, mtk, Added RLIMIT_SIGPENDING
.\" 2005-07-13, mtk, documented RLIMIT_MSGQUEUE limit.
.\" 2005-07-28, mtk, Added descriptions of RLIMIT_NICE and RLIMIT_RTPRIO
.\"
.TH GETRLIMIT 2 2004-06-16 "Linux" "Linux Programmer's Manual"
.TH GETRLIMIT 2 2005-07-28 "Linux" "Linux Programmer's Manual"
.SH NAME
getrlimit, setrlimit \- get/set resource limits
.SH SYNOPSIS
@ -245,6 +245,20 @@ The first addend in the formula, which includes
create an unlimited number of zero-length messages (such messages
nevertheless each consume some system memory for bookkeeping overhead).
.TP
.BR RLIMIT_NICE "(since kernel 2.6.12)"
Specifies a ceiling to which the process nice value can be raised using
.BR setpriority (2)
or
.BR nice (2).
The actual ceiling for the nice value is calculated as
.IR "19\ \-\ rlim_cur" .
(This strangeness occurs because of the differences in user-land
and kernel representations of the nice value, as described in
.BR getpriority (2)).
.\" FIXME (28 Jul 05) -- must check later whether glibc hides this issue
.\" by performing a calculation similar to "unice == 20 - knice"
.\" (like [gs]setpriority()) when dealing with RLIMIT_NICE
.TP
.B RLIMIT_NOFILE
Specifies a value one greater than the maximum file descriptor number
that can be opened by this process.
@ -273,6 +287,13 @@ specifying
.\" talk of making it do something has surfaced from time to time in LKML
.\" -- MTK, Jul 05
.TP
.BR RLIMIT_RTPRIO " (Since Linux 2.6.12, but see BUGS)"
Specifies a ceiling on the real-time priority that the calling
process may set using
.BR sched_setscheduler (2)
and
.BR sched_setparam (2).
.TP
.BR RLIMIT_SIGPENDING " (Since Linux 2.6.8)"
Specifies the limit on the number of signals
that may be queued for the real user ID of the calling process.
@ -329,6 +350,10 @@ signals delivered when a process encountered the soft and hard
.B RLIMIT_CPU
limits were delivered one (CPU) second later than they should have been.
This was fixed in kernel 2.6.8.
A kernel bug means that
.B RLIMIT_RTPRIO
does not work in kernel 2.6.12; the problem is fixed in kernel 2.6.13.
.SH "CONFORMING TO"
SVr4, 4.3BSD.
.BR RLIMIT_MEMLOCK
@ -339,9 +364,11 @@ they are present on the BSDs and Linux, but on few other implementations.
.BR RLIMIT_RSS
derives from BSD and is not specified in POSIX.1-2001;
it is nevertheless present on most implementations.
.B RLIMIT_SIGPENDING
.BR RLIMIT_MSGQUEUE ,
.BR RLIMIT_NICE ,
.BR RLIMIT_RTPRIO ,
and
.B RLIMIT_MSGQUEUE
.BR RLIMIT_SIGPENDING ,
are Linux specific.
.SH "SEE ALSO"
.BR dup (2),