92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
package syscallcompat
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import (
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"path/filepath"
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"sync"
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"syscall"
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"golang.org/x/sys/unix"
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)
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var chdirMutex sync.Mutex
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// emulateMknodat emulates the syscall for platforms that don't have it
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// in the kernel (darwin).
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func emulateMknodat(dirfd int, path string, mode uint32, dev int) error {
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if !filepath.IsAbs(path) {
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chdirMutex.Lock()
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defer chdirMutex.Unlock()
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cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
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if err != nil {
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return err
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}
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defer syscall.Close(cwd)
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err = syscall.Fchdir(dirfd)
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if err != nil {
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return err
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}
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defer syscall.Fchdir(cwd)
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}
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return syscall.Mknod(path, mode, dev)
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}
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// emulateSymlinkat emulates the syscall for platforms that don't have it
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// in the kernel (darwin).
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func emulateSymlinkat(oldpath string, newdirfd int, newpath string) (err error) {
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if !filepath.IsAbs(newpath) {
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chdirMutex.Lock()
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defer chdirMutex.Unlock()
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cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
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if err != nil {
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return err
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}
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defer syscall.Close(cwd)
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err = syscall.Fchdir(newdirfd)
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if err != nil {
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return err
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}
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defer syscall.Fchdir(cwd)
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}
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return syscall.Symlink(oldpath, newpath)
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}
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// emulateMkdirat emulates the syscall for platforms that don't have it
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// in the kernel (darwin).
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func emulateMkdirat(dirfd int, path string, mode uint32) (err error) {
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if !filepath.IsAbs(path) {
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chdirMutex.Lock()
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defer chdirMutex.Unlock()
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cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
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if err != nil {
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return err
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}
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defer syscall.Close(cwd)
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err = syscall.Fchdir(dirfd)
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if err != nil {
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return err
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}
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defer syscall.Fchdir(cwd)
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}
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return syscall.Mkdir(path, mode)
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}
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// emulateFstatat emulates the syscall for platforms that don't have it
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// in the kernel (darwin).
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func emulateFstatat(dirfd int, path string, stat *unix.Stat_t, flags int) (err error) {
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if !filepath.IsAbs(path) {
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chdirMutex.Lock()
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defer chdirMutex.Unlock()
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cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
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if err != nil {
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return err
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}
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defer syscall.Close(cwd)
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err = syscall.Fchdir(dirfd)
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if err != nil {
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return err
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}
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defer syscall.Fchdir(cwd)
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}
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return unix.Lstat(path, stat)
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}
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