//go:build go1.19 && !go1.23
// TODO: remove this file once go 1.22 is no longer supported.
package system
import (
"sync/atomic"
"syscall"
_ "unsafe" // Needed for go:linkname to work.
)
//go:linkname syscallOrigRlimitNofile syscall.origRlimitNofile
var syscallOrigRlimitNofile atomic.Pointer[syscall.Rlimit]
// ClearRlimitNofileCache clears go runtime's nofile rlimit cache.
// The argument is process RLIMIT_NOFILE values.
func ClearRlimitNofileCache(_ *syscall.Rlimit) {
// As reported in issue #4195, the new version of go runtime(since 1.19)
// will cache rlimit-nofile. Before executing execve, the rlimit-nofile
// of the process will be restored with the cache. In runc, this will
// cause the rlimit-nofile setting by the parent process for the container
// to become invalid. It can be solved by clearing this cache. But
// unfortunately, go stdlib doesn't provide such function, so we need to
// link to the private var `origRlimitNofile` in package syscall to hack.
syscallOrigRlimitNofile.Store(nil)
}