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Rewrote discussion on RLIMIT_MEMLOCK to incorporate kernel 2.6.9 changes. 

Added note on RLIMIT_CPU error in older kernels.
Added RLIMIT_SIGPENDING
This commit is contained in:
Michael Kerrisk 2004-12-03 16:06:22 +00:00
parent 1c1634c099
commit e6c5832f19
1 changed files with 19 additions and 4 deletions
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23
man2/getrlimit.2
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@ -55,6 +55,8 @@
.\" 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
.\"
.TH GETRLIMIT 2 2004-06-16 "Linux" "Linux Programmer's Manual"
.SH NAME
@ -150,7 +152,7 @@ Implementations vary in how they treat processes which continue to
consume CPU time after reaching the soft limit.
Portable applications that need to catch this signal should
perform an orderly termination upon first receipt of
.BR SIGXCPU ).
.BR SIGXCPU .)
.TP
.B RLIMIT_DATA
The maximum size of the process's data segment (initialized data,
@ -199,7 +201,7 @@ operation, where it sets a maximum on the total bytes in
shared memory segments (see
.BR shmget (2))
that may be locked by the real user ID of the calling process.
(The
The
.BR shmctl (2)
.B SHM_LOCK
locks are accounted for separately from the per-process memory
@ -209,14 +211,13 @@ and
.BR mmap (2)
.BR MAP_LOCKED ;
a process can lock bytes up to this limit in each of these
two categories.)
two categories.
In Linux kernels before 2.6.9, this limit controlled the amount of
memory that could be locked by a privileged process.
Since Linux 2.6.9, no limits are placed on the amount of memory
that a privileged process may lock, and this limit instead governs
the amount of memory that an unprivileged process may lock.
.\" FIXME Linux 2.6.8 adds RLIMIT_MSGQUEUE
.\" FIXME Linux 2.6.8 adds RLIMIT_SIGPENDING
.TP
.B RLIMIT_NOFILE
Specifies a value one greater than the maximum file descriptor number
@ -245,6 +246,16 @@ specifying
.\" As at kernel 2.6.9, this limit still does nothing in 2.6 though
.\" talk of making it do something continues in LKML -- MTK, Nov 04
.TP
.B RLIMIT_SIGPENDING
Specifies the limit on the number of real-time signals (see
.BR sigqueue (2)
and
.BR signal (7))
that may be queued for the real user ID of the calling process.
(Since Linux 2.6.8.)
.\" This replaces the /proc/sys/kernel/rtsig-max system-wide limit
.\" that was present in kernels <= 2.6.7. MTK Dec 04
.TP
.B RLIMIT_STACK
The maximum size of the process stack, in bytes.
Upon reaching this limit, a
@ -297,6 +308,9 @@ 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
is Linux specific.
.\" FIXME RLIMIT_MSGQUEUE is also Linux specific.
.SH "SEE ALSO"
.BR dup (2),
.BR fcntl (2),
@ -308,6 +322,7 @@ it is nevertheless present on most implementations.
.BR quotactl (2),
.BR sbrk (2),
.BR shmctl (2),
.BR sigqueue (2),
.BR malloc (3),
.BR ulimit (3),
.BR capabilities (7),