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comparison vendor/golang.org/x/sys/unix/syscall_bsd.go @ 66:787b5ee0289d draft

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Use vendored modules Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>
author yakumo.izuru
date Sun, 23 Jul 2023 13:18:53 +0000
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children 4b79810863f6
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65:6d985efa0f7a 66:787b5ee0289d
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 //go:build darwin || dragonfly || freebsd || netbsd || openbsd
6 // +build darwin dragonfly freebsd netbsd openbsd
7
8 // BSD system call wrappers shared by *BSD based systems
9 // including OS X (Darwin) and FreeBSD. Like the other
10 // syscall_*.go files it is compiled as Go code but also
11 // used as input to mksyscall which parses the //sys
12 // lines and generates system call stubs.
13
14 package unix
15
16 import (
17 "runtime"
18 "syscall"
19 "unsafe"
20 )
21
22 const ImplementsGetwd = true
23
24 func Getwd() (string, error) {
25 var buf [PathMax]byte
26 _, err := Getcwd(buf[0:])
27 if err != nil {
28 return "", err
29 }
30 n := clen(buf[:])
31 if n < 1 {
32 return "", EINVAL
33 }
34 return string(buf[:n]), nil
35 }
36
37 /*
38 * Wrapped
39 */
40
41 //sysnb getgroups(ngid int, gid *_Gid_t) (n int, err error)
42 //sysnb setgroups(ngid int, gid *_Gid_t) (err error)
43
44 func Getgroups() (gids []int, err error) {
45 n, err := getgroups(0, nil)
46 if err != nil {
47 return nil, err
48 }
49 if n == 0 {
50 return nil, nil
51 }
52
53 // Sanity check group count. Max is 16 on BSD.
54 if n < 0 || n > 1000 {
55 return nil, EINVAL
56 }
57
58 a := make([]_Gid_t, n)
59 n, err = getgroups(n, &a[0])
60 if err != nil {
61 return nil, err
62 }
63 gids = make([]int, n)
64 for i, v := range a[0:n] {
65 gids[i] = int(v)
66 }
67 return
68 }
69
70 func Setgroups(gids []int) (err error) {
71 if len(gids) == 0 {
72 return setgroups(0, nil)
73 }
74
75 a := make([]_Gid_t, len(gids))
76 for i, v := range gids {
77 a[i] = _Gid_t(v)
78 }
79 return setgroups(len(a), &a[0])
80 }
81
82 // Wait status is 7 bits at bottom, either 0 (exited),
83 // 0x7F (stopped), or a signal number that caused an exit.
84 // The 0x80 bit is whether there was a core dump.
85 // An extra number (exit code, signal causing a stop)
86 // is in the high bits.
87
88 type WaitStatus uint32
89
90 const (
91 mask = 0x7F
92 core = 0x80
93 shift = 8
94
95 exited = 0
96 killed = 9
97 stopped = 0x7F
98 )
99
100 func (w WaitStatus) Exited() bool { return w&mask == exited }
101
102 func (w WaitStatus) ExitStatus() int {
103 if w&mask != exited {
104 return -1
105 }
106 return int(w >> shift)
107 }
108
109 func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != 0 }
110
111 func (w WaitStatus) Signal() syscall.Signal {
112 sig := syscall.Signal(w & mask)
113 if sig == stopped || sig == 0 {
114 return -1
115 }
116 return sig
117 }
118
119 func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
120
121 func (w WaitStatus) Stopped() bool { return w&mask == stopped && syscall.Signal(w>>shift) != SIGSTOP }
122
123 func (w WaitStatus) Killed() bool { return w&mask == killed && syscall.Signal(w>>shift) != SIGKILL }
124
125 func (w WaitStatus) Continued() bool { return w&mask == stopped && syscall.Signal(w>>shift) == SIGSTOP }
126
127 func (w WaitStatus) StopSignal() syscall.Signal {
128 if !w.Stopped() {
129 return -1
130 }
131 return syscall.Signal(w>>shift) & 0xFF
132 }
133
134 func (w WaitStatus) TrapCause() int { return -1 }
135
136 //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
137
138 func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
139 var status _C_int
140 wpid, err = wait4(pid, &status, options, rusage)
141 if wstatus != nil {
142 *wstatus = WaitStatus(status)
143 }
144 return
145 }
146
147 //sys accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
148 //sys bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
149 //sys connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
150 //sysnb socket(domain int, typ int, proto int) (fd int, err error)
151 //sys getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
152 //sys setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
153 //sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
154 //sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
155 //sys Shutdown(s int, how int) (err error)
156
157 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
158 if sa.Port < 0 || sa.Port > 0xFFFF {
159 return nil, 0, EINVAL
160 }
161 sa.raw.Len = SizeofSockaddrInet4
162 sa.raw.Family = AF_INET
163 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
164 p[0] = byte(sa.Port >> 8)
165 p[1] = byte(sa.Port)
166 sa.raw.Addr = sa.Addr
167 return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
168 }
169
170 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
171 if sa.Port < 0 || sa.Port > 0xFFFF {
172 return nil, 0, EINVAL
173 }
174 sa.raw.Len = SizeofSockaddrInet6
175 sa.raw.Family = AF_INET6
176 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
177 p[0] = byte(sa.Port >> 8)
178 p[1] = byte(sa.Port)
179 sa.raw.Scope_id = sa.ZoneId
180 sa.raw.Addr = sa.Addr
181 return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
182 }
183
184 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
185 name := sa.Name
186 n := len(name)
187 if n >= len(sa.raw.Path) || n == 0 {
188 return nil, 0, EINVAL
189 }
190 sa.raw.Len = byte(3 + n) // 2 for Family, Len; 1 for NUL
191 sa.raw.Family = AF_UNIX
192 for i := 0; i < n; i++ {
193 sa.raw.Path[i] = int8(name[i])
194 }
195 return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
196 }
197
198 func (sa *SockaddrDatalink) sockaddr() (unsafe.Pointer, _Socklen, error) {
199 if sa.Index == 0 {
200 return nil, 0, EINVAL
201 }
202 sa.raw.Len = sa.Len
203 sa.raw.Family = AF_LINK
204 sa.raw.Index = sa.Index
205 sa.raw.Type = sa.Type
206 sa.raw.Nlen = sa.Nlen
207 sa.raw.Alen = sa.Alen
208 sa.raw.Slen = sa.Slen
209 sa.raw.Data = sa.Data
210 return unsafe.Pointer(&sa.raw), SizeofSockaddrDatalink, nil
211 }
212
213 func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
214 switch rsa.Addr.Family {
215 case AF_LINK:
216 pp := (*RawSockaddrDatalink)(unsafe.Pointer(rsa))
217 sa := new(SockaddrDatalink)
218 sa.Len = pp.Len
219 sa.Family = pp.Family
220 sa.Index = pp.Index
221 sa.Type = pp.Type
222 sa.Nlen = pp.Nlen
223 sa.Alen = pp.Alen
224 sa.Slen = pp.Slen
225 sa.Data = pp.Data
226 return sa, nil
227
228 case AF_UNIX:
229 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
230 if pp.Len < 2 || pp.Len > SizeofSockaddrUnix {
231 return nil, EINVAL
232 }
233 sa := new(SockaddrUnix)
234
235 // Some BSDs include the trailing NUL in the length, whereas
236 // others do not. Work around this by subtracting the leading
237 // family and len. The path is then scanned to see if a NUL
238 // terminator still exists within the length.
239 n := int(pp.Len) - 2 // subtract leading Family, Len
240 for i := 0; i < n; i++ {
241 if pp.Path[i] == 0 {
242 // found early NUL; assume Len included the NUL
243 // or was overestimating.
244 n = i
245 break
246 }
247 }
248 bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
249 sa.Name = string(bytes)
250 return sa, nil
251
252 case AF_INET:
253 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
254 sa := new(SockaddrInet4)
255 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
256 sa.Port = int(p[0])<<8 + int(p[1])
257 sa.Addr = pp.Addr
258 return sa, nil
259
260 case AF_INET6:
261 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
262 sa := new(SockaddrInet6)
263 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
264 sa.Port = int(p[0])<<8 + int(p[1])
265 sa.ZoneId = pp.Scope_id
266 sa.Addr = pp.Addr
267 return sa, nil
268 }
269 return anyToSockaddrGOOS(fd, rsa)
270 }
271
272 func Accept(fd int) (nfd int, sa Sockaddr, err error) {
273 var rsa RawSockaddrAny
274 var len _Socklen = SizeofSockaddrAny
275 nfd, err = accept(fd, &rsa, &len)
276 if err != nil {
277 return
278 }
279 if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && len == 0 {
280 // Accepted socket has no address.
281 // This is likely due to a bug in xnu kernels,
282 // where instead of ECONNABORTED error socket
283 // is accepted, but has no address.
284 Close(nfd)
285 return 0, nil, ECONNABORTED
286 }
287 sa, err = anyToSockaddr(fd, &rsa)
288 if err != nil {
289 Close(nfd)
290 nfd = 0
291 }
292 return
293 }
294
295 func Getsockname(fd int) (sa Sockaddr, err error) {
296 var rsa RawSockaddrAny
297 var len _Socklen = SizeofSockaddrAny
298 if err = getsockname(fd, &rsa, &len); err != nil {
299 return
300 }
301 // TODO(jsing): DragonFly has a "bug" (see issue 3349), which should be
302 // reported upstream.
303 if runtime.GOOS == "dragonfly" && rsa.Addr.Family == AF_UNSPEC && rsa.Addr.Len == 0 {
304 rsa.Addr.Family = AF_UNIX
305 rsa.Addr.Len = SizeofSockaddrUnix
306 }
307 return anyToSockaddr(fd, &rsa)
308 }
309
310 //sysnb socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
311
312 // GetsockoptString returns the string value of the socket option opt for the
313 // socket associated with fd at the given socket level.
314 func GetsockoptString(fd, level, opt int) (string, error) {
315 buf := make([]byte, 256)
316 vallen := _Socklen(len(buf))
317 err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
318 if err != nil {
319 return "", err
320 }
321 return string(buf[:vallen-1]), nil
322 }
323
324 //sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
325 //sys sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
326 //sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
327
328 func recvmsgRaw(fd int, iov []Iovec, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn int, recvflags int, err error) {
329 var msg Msghdr
330 msg.Name = (*byte)(unsafe.Pointer(rsa))
331 msg.Namelen = uint32(SizeofSockaddrAny)
332 var dummy byte
333 if len(oob) > 0 {
334 // receive at least one normal byte
335 if emptyIovecs(iov) {
336 var iova [1]Iovec
337 iova[0].Base = &dummy
338 iova[0].SetLen(1)
339 iov = iova[:]
340 }
341 msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
342 msg.SetControllen(len(oob))
343 }
344 if len(iov) > 0 {
345 msg.Iov = &iov[0]
346 msg.SetIovlen(len(iov))
347 }
348 if n, err = recvmsg(fd, &msg, flags); err != nil {
349 return
350 }
351 oobn = int(msg.Controllen)
352 recvflags = int(msg.Flags)
353 return
354 }
355
356 //sys sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
357
358 func sendmsgN(fd int, iov []Iovec, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags int) (n int, err error) {
359 var msg Msghdr
360 msg.Name = (*byte)(unsafe.Pointer(ptr))
361 msg.Namelen = uint32(salen)
362 var dummy byte
363 var empty bool
364 if len(oob) > 0 {
365 // send at least one normal byte
366 empty := emptyIovecs(iov)
367 if empty {
368 var iova [1]Iovec
369 iova[0].Base = &dummy
370 iova[0].SetLen(1)
371 iov = iova[:]
372 }
373 msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
374 msg.SetControllen(len(oob))
375 }
376 if len(iov) > 0 {
377 msg.Iov = &iov[0]
378 msg.SetIovlen(len(iov))
379 }
380 if n, err = sendmsg(fd, &msg, flags); err != nil {
381 return 0, err
382 }
383 if len(oob) > 0 && empty {
384 n = 0
385 }
386 return n, nil
387 }
388
389 //sys kevent(kq int, change unsafe.Pointer, nchange int, event unsafe.Pointer, nevent int, timeout *Timespec) (n int, err error)
390
391 func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, err error) {
392 var change, event unsafe.Pointer
393 if len(changes) > 0 {
394 change = unsafe.Pointer(&changes[0])
395 }
396 if len(events) > 0 {
397 event = unsafe.Pointer(&events[0])
398 }
399 return kevent(kq, change, len(changes), event, len(events), timeout)
400 }
401
402 // sysctlmib translates name to mib number and appends any additional args.
403 func sysctlmib(name string, args ...int) ([]_C_int, error) {
404 // Translate name to mib number.
405 mib, err := nametomib(name)
406 if err != nil {
407 return nil, err
408 }
409
410 for _, a := range args {
411 mib = append(mib, _C_int(a))
412 }
413
414 return mib, nil
415 }
416
417 func Sysctl(name string) (string, error) {
418 return SysctlArgs(name)
419 }
420
421 func SysctlArgs(name string, args ...int) (string, error) {
422 buf, err := SysctlRaw(name, args...)
423 if err != nil {
424 return "", err
425 }
426 n := len(buf)
427
428 // Throw away terminating NUL.
429 if n > 0 && buf[n-1] == '\x00' {
430 n--
431 }
432 return string(buf[0:n]), nil
433 }
434
435 func SysctlUint32(name string) (uint32, error) {
436 return SysctlUint32Args(name)
437 }
438
439 func SysctlUint32Args(name string, args ...int) (uint32, error) {
440 mib, err := sysctlmib(name, args...)
441 if err != nil {
442 return 0, err
443 }
444
445 n := uintptr(4)
446 buf := make([]byte, 4)
447 if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
448 return 0, err
449 }
450 if n != 4 {
451 return 0, EIO
452 }
453 return *(*uint32)(unsafe.Pointer(&buf[0])), nil
454 }
455
456 func SysctlUint64(name string, args ...int) (uint64, error) {
457 mib, err := sysctlmib(name, args...)
458 if err != nil {
459 return 0, err
460 }
461
462 n := uintptr(8)
463 buf := make([]byte, 8)
464 if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
465 return 0, err
466 }
467 if n != 8 {
468 return 0, EIO
469 }
470 return *(*uint64)(unsafe.Pointer(&buf[0])), nil
471 }
472
473 func SysctlRaw(name string, args ...int) ([]byte, error) {
474 mib, err := sysctlmib(name, args...)
475 if err != nil {
476 return nil, err
477 }
478
479 // Find size.
480 n := uintptr(0)
481 if err := sysctl(mib, nil, &n, nil, 0); err != nil {
482 return nil, err
483 }
484 if n == 0 {
485 return nil, nil
486 }
487
488 // Read into buffer of that size.
489 buf := make([]byte, n)
490 if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
491 return nil, err
492 }
493
494 // The actual call may return less than the original reported required
495 // size so ensure we deal with that.
496 return buf[:n], nil
497 }
498
499 func SysctlClockinfo(name string) (*Clockinfo, error) {
500 mib, err := sysctlmib(name)
501 if err != nil {
502 return nil, err
503 }
504
505 n := uintptr(SizeofClockinfo)
506 var ci Clockinfo
507 if err := sysctl(mib, (*byte)(unsafe.Pointer(&ci)), &n, nil, 0); err != nil {
508 return nil, err
509 }
510 if n != SizeofClockinfo {
511 return nil, EIO
512 }
513 return &ci, nil
514 }
515
516 func SysctlTimeval(name string) (*Timeval, error) {
517 mib, err := sysctlmib(name)
518 if err != nil {
519 return nil, err
520 }
521
522 var tv Timeval
523 n := uintptr(unsafe.Sizeof(tv))
524 if err := sysctl(mib, (*byte)(unsafe.Pointer(&tv)), &n, nil, 0); err != nil {
525 return nil, err
526 }
527 if n != unsafe.Sizeof(tv) {
528 return nil, EIO
529 }
530 return &tv, nil
531 }
532
533 //sys utimes(path string, timeval *[2]Timeval) (err error)
534
535 func Utimes(path string, tv []Timeval) error {
536 if tv == nil {
537 return utimes(path, nil)
538 }
539 if len(tv) != 2 {
540 return EINVAL
541 }
542 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
543 }
544
545 func UtimesNano(path string, ts []Timespec) error {
546 if ts == nil {
547 err := utimensat(AT_FDCWD, path, nil, 0)
548 if err != ENOSYS {
549 return err
550 }
551 return utimes(path, nil)
552 }
553 if len(ts) != 2 {
554 return EINVAL
555 }
556 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
557 if err != ENOSYS {
558 return err
559 }
560 // Not as efficient as it could be because Timespec and
561 // Timeval have different types in the different OSes
562 tv := [2]Timeval{
563 NsecToTimeval(TimespecToNsec(ts[0])),
564 NsecToTimeval(TimespecToNsec(ts[1])),
565 }
566 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
567 }
568
569 func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
570 if ts == nil {
571 return utimensat(dirfd, path, nil, flags)
572 }
573 if len(ts) != 2 {
574 return EINVAL
575 }
576 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
577 }
578
579 //sys futimes(fd int, timeval *[2]Timeval) (err error)
580
581 func Futimes(fd int, tv []Timeval) error {
582 if tv == nil {
583 return futimes(fd, nil)
584 }
585 if len(tv) != 2 {
586 return EINVAL
587 }
588 return futimes(fd, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
589 }
590
591 //sys poll(fds *PollFd, nfds int, timeout int) (n int, err error)
592
593 func Poll(fds []PollFd, timeout int) (n int, err error) {
594 if len(fds) == 0 {
595 return poll(nil, 0, timeout)
596 }
597 return poll(&fds[0], len(fds), timeout)
598 }
599
600 // TODO: wrap
601 // Acct(name nil-string) (err error)
602 // Gethostuuid(uuid *byte, timeout *Timespec) (err error)
603 // Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, err error)
604
605 var mapper = &mmapper{
606 active: make(map[*byte][]byte),
607 mmap: mmap,
608 munmap: munmap,
609 }
610
611 func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
612 return mapper.Mmap(fd, offset, length, prot, flags)
613 }
614
615 func Munmap(b []byte) (err error) {
616 return mapper.Munmap(b)
617 }
618
619 //sys Madvise(b []byte, behav int) (err error)
620 //sys Mlock(b []byte) (err error)
621 //sys Mlockall(flags int) (err error)
622 //sys Mprotect(b []byte, prot int) (err error)
623 //sys Msync(b []byte, flags int) (err error)
624 //sys Munlock(b []byte) (err error)
625 //sys Munlockall() (err error)