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package fileutils // import "github.com/docker/docker/pkg/fileutils"
import (
"bytes"
"os"
"os/exec"
"strconv"
)
// GetTotalUsedFds returns the number of used File Descriptors by executing
// "lsof -lnP -Ff -p PID".
//
// It uses the "-F" option to only print file-descriptors (f), and the "-l",
// "-n", and "-P" options to omit looking up user-names, host-names, and port-
// names. See [LSOF(8)].
//
// Deprecated: this function is only used internally, and will be removed in the next release.
//
// [LSOF(8)]: https://opensource.apple.com/source/lsof/lsof-49/lsof/lsof.man.auto.html
func GetTotalUsedFds() int {
output, err := exec.Command("lsof", "-lnP", "-Ff", "-p", strconv.Itoa(os.Getpid())).CombinedOutput()
if err != nil {
return -1
}
return bytes.Count(output, []byte("\nf")) // Count number of file descriptor fields in output.
}
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