


How to set ulimit -n from a Golang program without impacting the global limit?
Nov 05, 2024 am 08:38 AMSetting ulimit -n from a Golang program
Q: How can I set ulimit -n from a Golang program to restrict it within the program rather than globally?
A:
To set ulimit -n from a Golang program, you can use the following steps:
<code class="go">package main import ( "fmt" "syscall" ) func main() { var rLimit syscall.Rlimit err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit) if err != nil { fmt.Println("Error Getting Rlimit ", err) } fmt.Println(rLimit) rLimit.Max = 999999 rLimit.Cur = 999999 err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit) if err != nil { fmt.Println("Error Setting Rlimit ", err) } err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit) if err != nil { fmt.Println("Error Getting Rlimit ", err) } fmt.Println("Rlimit Final", rLimit) }</code>
Note: You may get an "invalid argument" error when setting the value. This is because you need to run the program with elevated privileges.
$ uname -a Linux peterSO 3.8.0-26-generic #38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 i686 i686 i686 GNU/Linux $ go version go version devel +ba52f6399462 Thu Jul 25 09:56:06 2013 -0400 linux/386 $ ulimit -Sn 1024 $ ulimit -Hn 4096 $ go build rlimit.go $ ./rlimit {1024 4096} Error Setting Rlimit operation not permitted Rlimit Final {1024 4096} $ sudo ./rlimit [sudo] password for peterSO: {1024 4096} Rlimit Final {999999 999999} $
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