| 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)]. |
| // |
| // [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. |
| } |