LIMITSSection: File Formats (5)
Index Return to Main Contents
NAMElimits - Resource limits definition
DESCRIPTIONThe limits 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.
By default no quotas are imposed on 'root'. In fact, there is no way to impose limits via this procedure to root-equiv accounts (accounts with UID 0).
Each line describes a limit for a user in the form:
The LIMITS_STRING is a string of a concatenated list of resource limits. Each limit consists of a letter identifier followed by a numerical limit.
The valid identifiers are:
A: max address space (KB)
C: max core file size (KB)
D: max data size (KB)
F: maximum filesize (KB)
M: max locked-in-memory address space (KB)
N: max number of open files
R: max resident set size (KB)
S: max stack size (KB)
T: max CPU time (MIN)
U: max number of processes
K: file creation mask, set by umask(2).
L: max number of logins for this user
P: process priority, set by setpriority(2).
For example, L2D2048N5 is a valid LIMITS_STRING. For reading convenience, the following entries are equivalent:
username L2 D2048 N5
Be aware that after username the rest of the line is considered a limit string, thus comments are not allowed. A invalid limits string will be rejected (not considered) by the login program.
The default entry is denoted by username "*". If you have multiple default entries in your LIMITS_FILE, then the last one will be used as the default entry.
To completely disable limits for a user, a single dash "-" will do.
SEE ALSOlogin(1), setpriority(2), setrlimit(2)
AUTHORCristian Gafton (email@example.com)