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1 // Copyright 2009 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 // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
6 // so that go vet can check that they are correct.
7
8 // +build 386,linux
9
10 package unix
11
12 import (
13 "unsafe"
14 )
15
16 func setTimespec(sec, nsec int64) Timespec {
17 return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
18 }
19
20 func setTimeval(sec, usec int64) Timeval {
21 return Timeval{Sec: int32(sec), Usec: int32(usec)}
22 }
23
24 //sysnb pipe(p *[2]_C_int) (err error)
25
26 func Pipe(p []int) (err error) {
27 if len(p) != 2 {
28 return EINVAL
29 }
30 var pp [2]_C_int
31 err = pipe(&pp)
32 p[0] = int(pp[0])
33 p[1] = int(pp[1])
34 return
35 }
36
37 //sysnb pipe2(p *[2]_C_int, flags int) (err error)
38
39 func Pipe2(p []int, flags int) (err error) {
40 if len(p) != 2 {
41 return EINVAL
42 }
43 var pp [2]_C_int
44 err = pipe2(&pp, flags)
45 p[0] = int(pp[0])
46 p[1] = int(pp[1])
47 return
48 }
49
50 // 64-bit file system and 32-bit uid calls
51 // (386 default is 32-bit file system and 16-bit uid).
52 //sys Dup2(oldfd int, newfd int) (err error)
53 //sysnb EpollCreate(size int) (fd int, err error)
54 //sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
55 //sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64
56 //sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
57 //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
58 //sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
59 //sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
60 //sysnb Getegid() (egid int) = SYS_GETEGID32
61 //sysnb Geteuid() (euid int) = SYS_GETEUID32
62 //sysnb Getgid() (gid int) = SYS_GETGID32
63 //sysnb Getuid() (uid int) = SYS_GETUID32
64 //sysnb InotifyInit() (fd int, err error)
65 //sys Ioperm(from int, num int, on int) (err error)
66 //sys Iopl(level int) (err error)
67 //sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
68 //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
69 //sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
70 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
71 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
72 //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
73 //sys Setfsgid(gid int) (err error) = SYS_SETFSGID32
74 //sys Setfsuid(uid int) (err error) = SYS_SETFSUID32
75 //sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
76 //sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
77 //sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
78 //sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
79 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
80 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
81 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error)
82 //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
83 //sys Ustat(dev int, ubuf *Ustat_t) (err error)
84 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
85 //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
86 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
87
88 //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
89 //sys Pause() (err error)
90
91 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
92 page := uintptr(offset / 4096)
93 if offset != int64(page)*4096 {
94 return 0, EINVAL
95 }
96 return mmap2(addr, length, prot, flags, fd, page)
97 }
98
99 type rlimit32 struct {
100 Cur uint32
101 Max uint32
102 }
103
104 //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
105
106 const rlimInf32 = ^uint32(0)
107 const rlimInf64 = ^uint64(0)
108
109 func Getrlimit(resource int, rlim *Rlimit) (err error) {
110 err = prlimit(0, resource, nil, rlim)
111 if err != ENOSYS {
112 return err
113 }
114
115 rl := rlimit32{}
116 err = getrlimit(resource, &rl)
117 if err != nil {
118 return
119 }
120
121 if rl.Cur == rlimInf32 {
122 rlim.Cur = rlimInf64
123 } else {
124 rlim.Cur = uint64(rl.Cur)
125 }
126
127 if rl.Max == rlimInf32 {
128 rlim.Max = rlimInf64
129 } else {
130 rlim.Max = uint64(rl.Max)
131 }
132 return
133 }
134
135 //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
136
137 func Setrlimit(resource int, rlim *Rlimit) (err error) {
138 err = prlimit(0, resource, rlim, nil)
139 if err != ENOSYS {
140 return err
141 }
142
143 rl := rlimit32{}
144 if rlim.Cur == rlimInf64 {
145 rl.Cur = rlimInf32
146 } else if rlim.Cur < uint64(rlimInf32) {
147 rl.Cur = uint32(rlim.Cur)
148 } else {
149 return EINVAL
150 }
151 if rlim.Max == rlimInf64 {
152 rl.Max = rlimInf32
153 } else if rlim.Max < uint64(rlimInf32) {
154 rl.Max = uint32(rlim.Max)
155 } else {
156 return EINVAL
157 }
158
159 return setrlimit(resource, &rl)
160 }
161
162 func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
163 newoffset, errno := seek(fd, offset, whence)
164 if errno != 0 {
165 return 0, errno
166 }
167 return newoffset, nil
168 }
169
170 //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error)
171 //sysnb Gettimeofday(tv *Timeval) (err error)
172 //sysnb Time(t *Time_t) (tt Time_t, err error)
173 //sys Utime(path string, buf *Utimbuf) (err error)
174 //sys utimes(path string, times *[2]Timeval) (err error)
175
176 // On x86 Linux, all the socket calls go through an extra indirection,
177 // I think because the 5-register system call interface can't handle
178 // the 6-argument calls like sendto and recvfrom. Instead the
179 // arguments to the underlying system call are the number below
180 // and a pointer to an array of uintptr. We hide the pointer in the
181 // socketcall assembly to avoid allocation on every system call.
182
183 const (
184 // see linux/net.h
185 _SOCKET = 1
186 _BIND = 2
187 _CONNECT = 3
188 _LISTEN = 4
189 _ACCEPT = 5
190 _GETSOCKNAME = 6
191 _GETPEERNAME = 7
192 _SOCKETPAIR = 8
193 _SEND = 9
194 _RECV = 10
195 _SENDTO = 11
196 _RECVFROM = 12
197 _SHUTDOWN = 13
198 _SETSOCKOPT = 14
199 _GETSOCKOPT = 15
200 _SENDMSG = 16
201 _RECVMSG = 17
202 _ACCEPT4 = 18
203 _RECVMMSG = 19
204 _SENDMMSG = 20
205 )
206
207 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) {
208 fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
209 if e != 0 {
210 err = e
211 }
212 return
213 }
214
215 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) {
216 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
217 if e != 0 {
218 err = e
219 }
220 return
221 }
222
223 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
224 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
225 if e != 0 {
226 err = e
227 }
228 return
229 }
230
231 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
232 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
233 if e != 0 {
234 err = e
235 }
236 return
237 }
238
239 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) {
240 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0)
241 if e != 0 {
242 err = e
243 }
244 return
245 }
246
247 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
248 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
249 if e != 0 {
250 err = e
251 }
252 return
253 }
254
255 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
256 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
257 if e != 0 {
258 err = e
259 }
260 return
261 }
262
263 func socket(domain int, typ int, proto int) (fd int, err error) {
264 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0)
265 if e != 0 {
266 err = e
267 }
268 return
269 }
270
271 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) {
272 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
273 if e != 0 {
274 err = e
275 }
276 return
277 }
278
279 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {
280 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0)
281 if e != 0 {
282 err = e
283 }
284 return
285 }
286
287 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) {
288 var base uintptr
289 if len(p) > 0 {
290 base = uintptr(unsafe.Pointer(&p[0]))
291 }
292 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
293 if e != 0 {
294 err = e
295 }
296 return
297 }
298
299 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) {
300 var base uintptr
301 if len(p) > 0 {
302 base = uintptr(unsafe.Pointer(&p[0]))
303 }
304 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen))
305 if e != 0 {
306 err = e
307 }
308 return
309 }
310
311 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
312 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
313 if e != 0 {
314 err = e
315 }
316 return
317 }
318
319 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) {
320 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
321 if e != 0 {
322 err = e
323 }
324 return
325 }
326
327 func Listen(s int, n int) (err error) {
328 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0)
329 if e != 0 {
330 err = e
331 }
332 return
333 }
334
335 func Shutdown(s, how int) (err error) {
336 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0)
337 if e != 0 {
338 err = e
339 }
340 return
341 }
342
343 func Fstatfs(fd int, buf *Statfs_t) (err error) {
344 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
345 if e != 0 {
346 err = e
347 }
348 return
349 }
350
351 func Statfs(path string, buf *Statfs_t) (err error) {
352 pathp, err := BytePtrFromString(path)
353 if err != nil {
354 return err
355 }
356 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
357 if e != 0 {
358 err = e
359 }
360 return
361 }
362
363 func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) }
364
365 func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) }
366
367 func (iov *Iovec) SetLen(length int) {
368 iov.Len = uint32(length)
369 }
370
371 func (msghdr *Msghdr) SetControllen(length int) {
372 msghdr.Controllen = uint32(length)
373 }
374
375 func (cmsg *Cmsghdr) SetLen(length int) {
376 cmsg.Len = uint32(length)
377 }
378
379 //sys poll(fds *PollFd, nfds int, timeout int) (n int, err error)
380
381 func Poll(fds []PollFd, timeout int) (n int, err error) {
382 if len(fds) == 0 {
383 return poll(nil, 0, timeout)
384 }
385 return poll(&fds[0], len(fds), timeout)
386 }