Please see the manual page for ulimit for details.
'pinfo' is a lynx-style info page browser that I find very usefull for browsing info manual pages on Linux.
from the Linux info pages for ulimit:
Here is a list of resources for which you can specify a limit. Memory and file sizes are measured in bytes.
`RLIMIT_CPU'
The maximum amount of CPU time the process can use. If it runs for longer than this, it gets a signal: `SIGXCPU'. The value is measured in seconds. *Note Operation Error Signals::.
`RLIMIT_FSIZE'