1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build dragonfly || freebsd || linux || netbsd || (openbsd && mips64)
6
7 package unix
8
9 import (
10 "syscall"
11 "unsafe"
12 )
13
14 func Unlinkat(dirfd int, path string, flags int) error {
15 p, err := syscall.BytePtrFromString(path)
16 if err != nil {
17 return err
18 }
19
20 _, _, errno := syscall.Syscall(unlinkatTrap, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags))
21 if errno != 0 {
22 return errno
23 }
24
25 return nil
26 }
27
28 func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
29 p, err := syscall.BytePtrFromString(path)
30 if err != nil {
31 return 0, err
32 }
33
34 fd, _, errno := syscall.Syscall6(openatTrap, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), uintptr(perm), 0, 0)
35 if errno != 0 {
36 return 0, errno
37 }
38
39 return int(fd), nil
40 }
41
42 func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
43 p0, err := syscall.BytePtrFromString(path)
44 if err != nil {
45 return 0, err
46 }
47 var p1 unsafe.Pointer
48 if len(buf) > 0 {
49 p1 = unsafe.Pointer(&buf[0])
50 } else {
51 p1 = unsafe.Pointer(&_zero)
52 }
53 n, _, errno := syscall.Syscall6(readlinkatTrap,
54 uintptr(dirfd),
55 uintptr(unsafe.Pointer(p0)),
56 uintptr(p1),
57 uintptr(len(buf)),
58 0, 0)
59 if errno != 0 {
60 return 0, errno
61 }
62
63 return int(n), nil
64 }
65
66 func Mkdirat(dirfd int, path string, mode uint32) error {
67 p, err := syscall.BytePtrFromString(path)
68 if err != nil {
69 return err
70 }
71
72 _, _, errno := syscall.Syscall6(mkdiratTrap,
73 uintptr(dirfd),
74 uintptr(unsafe.Pointer(p)),
75 uintptr(mode),
76 0, 0, 0)
77 if errno != 0 {
78 return errno
79 }
80 return nil
81 }
82
83 func Fchmodat(dirfd int, path string, mode uint32, flags int) error {
84 p, err := syscall.BytePtrFromString(path)
85 if err != nil {
86 return err
87 }
88 _, _, errno := syscall.Syscall6(fchmodatTrap,
89 uintptr(dirfd),
90 uintptr(unsafe.Pointer(p)),
91 uintptr(mode),
92 uintptr(flags),
93 0, 0)
94 if errno != 0 {
95 return errno
96 }
97 return nil
98 }
99
100 func Fchownat(dirfd int, path string, uid, gid int, flags int) error {
101 p, err := syscall.BytePtrFromString(path)
102 if err != nil {
103 return err
104 }
105 _, _, errno := syscall.Syscall6(fchownatTrap,
106 uintptr(dirfd),
107 uintptr(unsafe.Pointer(p)),
108 uintptr(uid),
109 uintptr(gid),
110 uintptr(flags),
111 0)
112 if errno != 0 {
113 return errno
114 }
115 return nil
116 }
117
118 func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) error {
119 oldp, err := syscall.BytePtrFromString(oldpath)
120 if err != nil {
121 return err
122 }
123 newp, err := syscall.BytePtrFromString(newpath)
124 if err != nil {
125 return err
126 }
127 _, _, errno := syscall.Syscall6(renameatTrap,
128 uintptr(olddirfd),
129 uintptr(unsafe.Pointer(oldp)),
130 uintptr(newdirfd),
131 uintptr(unsafe.Pointer(newp)),
132 0,
133 0)
134 if errno != 0 {
135 return errno
136 }
137 return nil
138 }
139
140 func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flag int) error {
141 oldp, err := syscall.BytePtrFromString(oldpath)
142 if err != nil {
143 return err
144 }
145 newp, err := syscall.BytePtrFromString(newpath)
146 if err != nil {
147 return err
148 }
149 _, _, errno := syscall.Syscall6(linkatTrap,
150 uintptr(olddirfd),
151 uintptr(unsafe.Pointer(oldp)),
152 uintptr(newdirfd),
153 uintptr(unsafe.Pointer(newp)),
154 uintptr(flag),
155 0)
156 if errno != 0 {
157 return errno
158 }
159 return nil
160 }
161
162 func Symlinkat(oldpath string, newdirfd int, newpath string) error {
163 oldp, err := syscall.BytePtrFromString(oldpath)
164 if err != nil {
165 return err
166 }
167 newp, err := syscall.BytePtrFromString(newpath)
168 if err != nil {
169 return err
170 }
171 _, _, errno := syscall.Syscall(symlinkatTrap,
172 uintptr(unsafe.Pointer(oldp)),
173 uintptr(newdirfd),
174 uintptr(unsafe.Pointer(newp)))
175 if errno != 0 {
176 return errno
177 }
178 return nil
179 }
180