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diff --git a/man/man5/limits.5 b/man/man5/limits.5 new file mode 100644 index 0000000..46c5432 --- /dev/null +++ b/man/man5/limits.5 @@ -0,0 +1,274 @@ +'\" t +.\" Title: limits +.\" Author: Luca Berra +.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> +.\" Date: 11/08/2022 +.\" Manual: File Formats and Configuration Files +.\" Source: shadow-utils 4.13 +.\" Language: English +.\" +.TH "LIMITS" "5" "11/08/2022" "shadow\-utils 4\&.13" "File Formats and Configuration" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +limits \- resource limits definition +.SH "DESCRIPTION" +.PP +The +\fIlimits\fR +file (/etc/limits +by default or LIMITS_FILE defined +config\&.h) describes the resource limits you wish to impose\&. It should be owned by root and readable by root account only\&. +.PP +By default no quota is imposed on \*(Aqroot\*(Aq\&. In fact, there is no way to impose limits via this procedure to root\-equiv accounts (accounts with UID 0)\&. +.PP +Each line describes a limit for a user in the form: +.PP +\fIuser LIMITS_STRING\fR +.PP +or in the form: +.PP +\fI@group LIMITS_STRING\fR +.PP +The +\fILIMITS_STRING\fR +is a string of a concatenated list of resource limits\&. Each limit consists of a letter identifier followed by a numerical limit\&. +.PP +The valid identifiers are: +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +A: max address space (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +C: max core file size (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +D: max data size (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +F: maximum file size (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +K: file creation mask, set by +\fBumask\fR(2)\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +I: max nice value (0\&.\&.39 which translates to 20\&.\&.\-19) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +L: max number of logins for this user +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +M: max locked\-in\-memory address space (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +N: max number of open files +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +O: max real time priority +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +P: process priority, set by +\fBsetpriority\fR(2)\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +R: max resident set size (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +S: max stack size (KB) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +T: max CPU time (MIN) +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +U: max number of processes +.RE +.PP +For example, +\fIL2D2048N5\fR +is a valid +\fILIMITS_STRING\fR\&. For reading convenience, the following entries are equivalent: +.sp +.if n \{\ +.RS 4 +.\} +.nf + username L2D2048N5 + username L2 D2048 N5 + +.fi +.if n \{\ +.RE +.\} +.PP +Be aware that after +\fIusername\fR +the rest of the line is considered a limit string, thus comments are not allowed\&. An invalid limits string will be rejected (not considered) by the +\fBlogin\fR +program\&. +.PP +The default entry is denoted by username "\fI*\fR"\&. If you have multiple +\fIdefault\fR +entries in your +\fILIMITS_FILE\fR, then the last one will be used as the default entry\&. +.PP +The limits specified in the form "\fI@group\fR" apply to the members of the specified +\fIgroup\fR\&. +.PP +If more than one line with limits for a user exist, only the first line for this user will be considered\&. +.PP +If no lines are specified for a user, the last +\fI@group\fR +line matching a group whose the user is a member of will be considered, or the last line with default limits if no groups contain the user\&. +.PP +To completely disable limits for a user, a single dash "\fI\-\fR" will do\&. +.PP +To disable a limit for a user, a single dash "\fI\-\fR" can be used instead of the numerical value for this limit\&. +.PP +Also, please note that all limit settings are set PER LOGIN\&. They are not global, nor are they permanent\&. Perhaps global limits will come, but for now this will have to do ;) +.SH "FILES" +.PP +/etc/limits +.RS 4 +.RE +.SH "SEE ALSO" +.PP +\fBlogin\fR(1), +\fBsetpriority\fR(2), +\fBsetrlimit\fR(2)\&. |