mirror of
https://github.com/rclone/rclone.git
synced 2024-11-27 02:45:16 +01:00
41 lines
973 B
Go
41 lines
973 B
Go
// +build dragonfly freebsd linux netbsd openbsd plan9 solaris
|
|
|
|
package daemon
|
|
|
|
import (
|
|
"fmt"
|
|
"syscall"
|
|
)
|
|
|
|
func lockFile(fd uintptr) error {
|
|
err := syscall.Flock(int(fd), syscall.LOCK_EX|syscall.LOCK_NB)
|
|
if err == syscall.EWOULDBLOCK {
|
|
err = ErrWouldBlock
|
|
}
|
|
return err
|
|
}
|
|
|
|
func unlockFile(fd uintptr) error {
|
|
err := syscall.Flock(int(fd), syscall.LOCK_UN)
|
|
if err == syscall.EWOULDBLOCK {
|
|
err = ErrWouldBlock
|
|
}
|
|
return err
|
|
}
|
|
|
|
const pathMax = 0x1000
|
|
|
|
func getFdName(fd uintptr) (name string, err error) {
|
|
path := fmt.Sprintf("/proc/self/fd/%d", int(fd))
|
|
// We use predefined pathMax const because /proc directory contains special files
|
|
// so that unable to get correct size of pseudo-symlink through lstat.
|
|
// please see notes and example for readlink syscall:
|
|
// http://man7.org/linux/man-pages/man2/readlink.2.html#NOTES
|
|
buf := make([]byte, pathMax)
|
|
var n int
|
|
if n, err = syscall.Readlink(path, buf); err == nil {
|
|
name = string(buf[:n])
|
|
}
|
|
return
|
|
}
|