function::rlimit_from_str - Linux

Overview

The function::rlimit_from_str function parses a string and assigns it to the kernel resource limit. Its key application is in system configuration files and initialization scripts for setting up resource limits for processes.

Syntax

rlimit_from_str(&rlim, STR)

Options/Flags

• STR: A string that defines the new resource limit. The format is "=", where:
  • resource is one of the kernel resource limits (e.g., core, cpu, data, fsize, etc.).
  • value is a decimal number representing the new limit.
  • Multiple resource limits can be specified by separating them with commas.

Examples

Example 1: Setting the maximum file size limit

rlimit_from_str(&rlimit, "fsize=1024000")  // Set maximum file size to 1GB

Example 2: Setting multiple resource limits in a script

RLIMIT="cpu=10,data=100MB,heap=1GB"
rlimit_from_str(&rlim, RLIMIT);  // Set limits read from `RLIMIT`

Common Issues

• Make sure the string format is correct and adheres to the syntax.
• Verify that the resource limit is a valid one for the system.
• Be cautious when setting resource limits too low, as it can lead to process failures.

Integration

The function::rlimit_from_str can be combined with other commands to automate system configuration tasks. For example, it can be used in conjunction with the perl or python languages to read configuration files and set resource limits dynamically.

Related Commands

• getrlimit: Get the current resource limits.
• setrlimit: Set the resource limits.