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Go's syscall.Setrlimit function enables setting ulimit -n from within a Go program. This allows for customizing resource limits within the program without making global changes.
The setrlimit system call sets the resource limits for the current process. It takes two arguments: the resource limit type (RLIMIT_NOFILE) and a pointer to a syscall.Rlimit structure.
Here's a Go program that demonstrates how to set ulimit -n:
<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 { // Handle the error } }</code>
Note that setting hard limits requires elevated privileges (CAP_SYS_RESOURCE). Otherwise, the program will encounter an "operation not permitted" error. Non-privileged processes can only set soft limits within the range defined by the hard limits.
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