golang at_libc 代码
文件路径：/src/internal/syscall/unix/at_libc.go
/ Copyright 2018 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/go:build aix || solaris
package unix
import (
"syscall"
"unsafe"
)
/go:linkname procFstatat libc_fstatat
/go:linkname procOpenat libc_openat
/go:linkname procUnlinkat libc_unlinkat
var (
procFstatat,
procOpenat,
procUnlinkat uintptr
)
func Unlinkat(dirfd int, path string, flags int) error {
p, err := syscall.BytePtrFromString(path)
if err != nil {
return err
}
_, _, errno := syscall6(uintptr(unsafe.Pointer(&procUnlinkat)), 3, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), 0, 0, 0)
if errno != 0 {
return errno
}
return nil
}
func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
p, err := syscall.BytePtrFromString(path)
if err != nil {
return 0, err
}
fd, _, errno := syscall6(uintptr(unsafe.Pointer(&procOpenat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), uintptr(perm), 0, 0)
if errno != 0 {
return 0, errno
}
return int(fd), nil
}
func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
p, err := syscall.BytePtrFromString(path)
if err != nil {
return err
}
_, _, errno := syscall6(uintptr(unsafe.Pointer(&procFstatat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
if errno != 0 {
return errno
}
return nil
}