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diff --git a/doc/README.limits b/doc/README.limits new file mode 100644 index 0000000..80ed940 --- /dev/null +++ b/doc/README.limits @@ -0,0 +1,66 @@ + +ABOUT shadow-login limits: + +This code is merged into shadow login program from the original LShell 2.01 +written by Joel Katz. The port and some additional features have been added +by Cristian Gafton (gafton@sorosis.ro). + + +Changes: + - 96/04/16 + - {spaces,tabs} allowed within limits string + - Warn via syslog multiple default limits + - added few paragraphs to the login man page + - 96/04/14 + - code merged into lmain.c --cristiang + +TODO: - support groups in the limits file + (only usernames are supported at this moment :-( ) + +Setting user limits for shadow login program + +First, make a root-only-readable file (/etc/limits by default or LIMITS_FILE +defined config.h) that describes the resource limits you wish to impose. 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: + + user LIMITS_STRING + +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 + L: max number of logins for this user + +For example, L2D2048N5 is a valid LIMITS_STRING. For reading convenience, +the following entries are equivalent: + +username L2D2048N5 +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. + +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 ;) + |