internal/syscallcompat/emulate.go


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

//go:build darwin

package syscallcompat

import (
	"path/filepath"
	"sync"
	"syscall"
)

var chdirMutex sync.Mutex

// emulateMknodat emulates the syscall for platforms that don't have it
// in the kernel (darwin).
func emulateMknodat(dirfd int, path string, mode uint32, dev int) error {
	if !filepath.IsAbs(path) {
		chdirMutex.Lock()
		defer chdirMutex.Unlock()
		cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
		if err != nil {
			return err
		}
		defer syscall.Close(cwd)
		err = syscall.Fchdir(dirfd)
		if err != nil {
			return err
		}
		defer syscall.Fchdir(cwd)
	}
	return syscall.Mknod(path, mode, dev)
}