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JC		 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// Linux system calls.
6// This file is compiled as ordinary Go code,
7// but it is also input to mksyscall,
8// which parses the //sys lines and generates system call stubs.
9// Note that sometimes we use a lowercase //sys name and
10// wrap it in our own nicer implementation.
11
12package unix
13
14import (
15 "syscall"
16 "unsafe"
17)
18
19/*
20 * Wrapped
21 */
22
23func Access(path string, mode uint32) (err error) {
24 return Faccessat(AT_FDCWD, path, mode, 0)
25}
26
27func Chmod(path string, mode uint32) (err error) {
28 return Fchmodat(AT_FDCWD, path, mode, 0)
29}
30
31func Chown(path string, uid int, gid int) (err error) {
32 return Fchownat(AT_FDCWD, path, uid, gid, 0)
33}
34
35func Creat(path string, mode uint32) (fd int, err error) {
36 return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
37}
38
39//sys linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
40
41func Link(oldpath string, newpath string) (err error) {
42 return linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0)
43}
44
45func Mkdir(path string, mode uint32) (err error) {
46 return Mkdirat(AT_FDCWD, path, mode)
47}
48
49func Mknod(path string, mode uint32, dev int) (err error) {
50 return Mknodat(AT_FDCWD, path, mode, dev)
51}
52
53func Open(path string, mode int, perm uint32) (fd int, err error) {
54 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm)
55}
56
57//sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
58
59func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
60 return openat(dirfd, path, flags|O_LARGEFILE, mode)
61}
62
63//sys readlinkat(dirfd int, path string, buf []byte) (n int, err error)
64
65func Readlink(path string, buf []byte) (n int, err error) {
66 return readlinkat(AT_FDCWD, path, buf)
67}
68
69func Rename(oldpath string, newpath string) (err error) {
70 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath)
71}
72
73func Rmdir(path string) error {
74 return unlinkat(AT_FDCWD, path, AT_REMOVEDIR)
75}
76
77//sys symlinkat(oldpath string, newdirfd int, newpath string) (err error)
78
79func Symlink(oldpath string, newpath string) (err error) {
80 return symlinkat(oldpath, AT_FDCWD, newpath)
81}
82
83func Unlink(path string) error {
84 return unlinkat(AT_FDCWD, path, 0)
85}
86
87//sys unlinkat(dirfd int, path string, flags int) (err error)
88
89func Unlinkat(dirfd int, path string) error {
90 return unlinkat(dirfd, path, 0)
91}
92
93//sys utimes(path string, times *[2]Timeval) (err error)
94
95func Utimes(path string, tv []Timeval) (err error) {
96 if tv == nil {
97 return utimes(path, nil)
98 }
99 if len(tv) != 2 {
100 return EINVAL
101 }
102 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
103}
104
105//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
106
107func UtimesNano(path string, ts []Timespec) error {
108 if ts == nil {
109 err := utimensat(AT_FDCWD, path, nil, 0)
110 if err != ENOSYS {
111 return err
112 }
113 return utimes(path, nil)
114 }
115 if len(ts) != 2 {
116 return EINVAL
117 }
118 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
119 if err != ENOSYS {
120 return err
121 }
122 // If the utimensat syscall isn't available (utimensat was added to Linux
123 // in 2.6.22, Released, 8 July 2007) then fall back to utimes
124 var tv [2]Timeval
125 for i := 0; i < 2; i++ {
126 tv[i].Sec = ts[i].Sec
127 tv[i].Usec = ts[i].Nsec / 1000
128 }
129 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
130}
131
132func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
133 if ts == nil {
134 return utimensat(dirfd, path, nil, flags)
135 }
136 if len(ts) != 2 {
137 return EINVAL
138 }
139 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
140}
141
142//sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error)
143
144func Futimesat(dirfd int, path string, tv []Timeval) error {
145 pathp, err := BytePtrFromString(path)
146 if err != nil {
147 return err
148 }
149 if tv == nil {
150 return futimesat(dirfd, pathp, nil)
151 }
152 if len(tv) != 2 {
153 return EINVAL
154 }
155 return futimesat(dirfd, pathp, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
156}
157
158func Futimes(fd int, tv []Timeval) (err error) {
159 // Believe it or not, this is the best we can do on Linux
160 // (and is what glibc does).
161 return Utimes("/proc/self/fd/"+itoa(fd), tv)
162}
163
164const ImplementsGetwd = true
165
166//sys Getcwd(buf []byte) (n int, err error)
167
168func Getwd() (wd string, err error) {
169 var buf [PathMax]byte
170 n, err := Getcwd(buf[0:])
171 if err != nil {
172 return "", err
173 }
174 // Getcwd returns the number of bytes written to buf, including the NUL.
175 if n < 1 || n > len(buf) || buf[n-1] != 0 {
176 return "", EINVAL
177 }
178 return string(buf[0 : n-1]), nil
179}
180
181func Getgroups() (gids []int, err error) {
182 n, err := getgroups(0, nil)
183 if err != nil {
184 return nil, err
185 }
186 if n == 0 {
187 return nil, nil
188 }
189
190 // Sanity check group count. Max is 1<<16 on Linux.
191 if n < 0 || n > 1<<20 {
192 return nil, EINVAL
193 }
194
195 a := make([]_Gid_t, n)
196 n, err = getgroups(n, &a[0])
197 if err != nil {
198 return nil, err
199 }
200 gids = make([]int, n)
201 for i, v := range a[0:n] {
202 gids[i] = int(v)
203 }
204 return
205}
206
207func Setgroups(gids []int) (err error) {
208 if len(gids) == 0 {
209 return setgroups(0, nil)
210 }
211
212 a := make([]_Gid_t, len(gids))
213 for i, v := range gids {
214 a[i] = _Gid_t(v)
215 }
216 return setgroups(len(a), &a[0])
217}
218
219type WaitStatus uint32
220
221// Wait status is 7 bits at bottom, either 0 (exited),
222// 0x7F (stopped), or a signal number that caused an exit.
223// The 0x80 bit is whether there was a core dump.
224// An extra number (exit code, signal causing a stop)
225// is in the high bits. At least that's the idea.
226// There are various irregularities. For example, the
227// "continued" status is 0xFFFF, distinguishing itself
228// from stopped via the core dump bit.
229
230const (
231 mask = 0x7F
232 core = 0x80
233 exited = 0x00
234 stopped = 0x7F
235 shift = 8
236)
237
238func (w WaitStatus) Exited() bool { return w&mask == exited }
239
240func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
241
242func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
243
244func (w WaitStatus) Continued() bool { return w == 0xFFFF }
245
246func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
247
248func (w WaitStatus) ExitStatus() int {
249 if !w.Exited() {
250 return -1
251 }
252 return int(w>>shift) & 0xFF
253}
254
255func (w WaitStatus) Signal() syscall.Signal {
256 if !w.Signaled() {
257 return -1
258 }
259 return syscall.Signal(w & mask)
260}
261
262func (w WaitStatus) StopSignal() syscall.Signal {
263 if !w.Stopped() {
264 return -1
265 }
266 return syscall.Signal(w>>shift) & 0xFF
267}
268
269func (w WaitStatus) TrapCause() int {
270 if w.StopSignal() != SIGTRAP {
271 return -1
272 }
273 return int(w>>shift) >> 8
274}
275
276//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
277
278func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
279 var status _C_int
280 wpid, err = wait4(pid, &status, options, rusage)
281 if wstatus != nil {
282 *wstatus = WaitStatus(status)
283 }
284 return
285}
286
287func Mkfifo(path string, mode uint32) (err error) {
288 return Mknod(path, mode|S_IFIFO, 0)
289}
290
291func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
292 if sa.Port < 0 || sa.Port > 0xFFFF {
293 return nil, 0, EINVAL
294 }
295 sa.raw.Family = AF_INET
296 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
297 p[0] = byte(sa.Port >> 8)
298 p[1] = byte(sa.Port)
299 for i := 0; i < len(sa.Addr); i++ {
300 sa.raw.Addr[i] = sa.Addr[i]
301 }
302 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
303}
304
305func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
306 if sa.Port < 0 || sa.Port > 0xFFFF {
307 return nil, 0, EINVAL
308 }
309 sa.raw.Family = AF_INET6
310 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
311 p[0] = byte(sa.Port >> 8)
312 p[1] = byte(sa.Port)
313 sa.raw.Scope_id = sa.ZoneId
314 for i := 0; i < len(sa.Addr); i++ {
315 sa.raw.Addr[i] = sa.Addr[i]
316 }
317 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
318}
319
320func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
321 name := sa.Name
322 n := len(name)
323 if n >= len(sa.raw.Path) {
324 return nil, 0, EINVAL
325 }
326 sa.raw.Family = AF_UNIX
327 for i := 0; i < n; i++ {
328 sa.raw.Path[i] = int8(name[i])
329 }
330 // length is family (uint16), name, NUL.
331 sl := _Socklen(2)
332 if n > 0 {
333 sl += _Socklen(n) + 1
334 }
335 if sa.raw.Path[0] == '@' {
336 sa.raw.Path[0] = 0
337 // Don't count trailing NUL for abstract address.
338 sl--
339 }
340
341 return unsafe.Pointer(&sa.raw), sl, nil
342}
343
344type SockaddrLinklayer struct {
345 Protocol uint16
346 Ifindex int
347 Hatype uint16
348 Pkttype uint8
349 Halen uint8
350 Addr [8]byte
351 raw RawSockaddrLinklayer
352}
353
354func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) {
355 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
356 return nil, 0, EINVAL
357 }
358 sa.raw.Family = AF_PACKET
359 sa.raw.Protocol = sa.Protocol
360 sa.raw.Ifindex = int32(sa.Ifindex)
361 sa.raw.Hatype = sa.Hatype
362 sa.raw.Pkttype = sa.Pkttype
363 sa.raw.Halen = sa.Halen
364 for i := 0; i < len(sa.Addr); i++ {
365 sa.raw.Addr[i] = sa.Addr[i]
366 }
367 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil
368}
369
370type SockaddrNetlink struct {
371 Family uint16
372 Pad uint16
373 Pid uint32
374 Groups uint32
375 raw RawSockaddrNetlink
376}
377
378func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) {
379 sa.raw.Family = AF_NETLINK
380 sa.raw.Pad = sa.Pad
381 sa.raw.Pid = sa.Pid
382 sa.raw.Groups = sa.Groups
383 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil
384}
385
386func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
387 switch rsa.Addr.Family {
388 case AF_NETLINK:
389 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
390 sa := new(SockaddrNetlink)
391 sa.Family = pp.Family
392 sa.Pad = pp.Pad
393 sa.Pid = pp.Pid
394 sa.Groups = pp.Groups
395 return sa, nil
396
397 case AF_PACKET:
398 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
399 sa := new(SockaddrLinklayer)
400 sa.Protocol = pp.Protocol
401 sa.Ifindex = int(pp.Ifindex)
402 sa.Hatype = pp.Hatype
403 sa.Pkttype = pp.Pkttype
404 sa.Halen = pp.Halen
405 for i := 0; i < len(sa.Addr); i++ {
406 sa.Addr[i] = pp.Addr[i]
407 }
408 return sa, nil
409
410 case AF_UNIX:
411 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
412 sa := new(SockaddrUnix)
413 if pp.Path[0] == 0 {
414 // "Abstract" Unix domain socket.
415 // Rewrite leading NUL as @ for textual display.
416 // (This is the standard convention.)
417 // Not friendly to overwrite in place,
418 // but the callers below don't care.
419 pp.Path[0] = '@'
420 }
421
422 // Assume path ends at NUL.
423 // This is not technically the Linux semantics for
424 // abstract Unix domain sockets--they are supposed
425 // to be uninterpreted fixed-size binary blobs--but
426 // everyone uses this convention.
427 n := 0
428 for n < len(pp.Path) && pp.Path[n] != 0 {
429 n++
430 }
431 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
432 sa.Name = string(bytes)
433 return sa, nil
434
435 case AF_INET:
436 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
437 sa := new(SockaddrInet4)
438 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
439 sa.Port = int(p[0])<<8 + int(p[1])
440 for i := 0; i < len(sa.Addr); i++ {
441 sa.Addr[i] = pp.Addr[i]
442 }
443 return sa, nil
444
445 case AF_INET6:
446 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
447 sa := new(SockaddrInet6)
448 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
449 sa.Port = int(p[0])<<8 + int(p[1])
450 sa.ZoneId = pp.Scope_id
451 for i := 0; i < len(sa.Addr); i++ {
452 sa.Addr[i] = pp.Addr[i]
453 }
454 return sa, nil
455 }
456 return nil, EAFNOSUPPORT
457}
458
459func Accept(fd int) (nfd int, sa Sockaddr, err error) {
460 var rsa RawSockaddrAny
461 var len _Socklen = SizeofSockaddrAny
462 nfd, err = accept(fd, &rsa, &len)
463 if err != nil {
464 return
465 }
466 sa, err = anyToSockaddr(&rsa)
467 if err != nil {
468 Close(nfd)
469 nfd = 0
470 }
471 return
472}
473
474func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
475 var rsa RawSockaddrAny
476 var len _Socklen = SizeofSockaddrAny
477 nfd, err = accept4(fd, &rsa, &len, flags)
478 if err != nil {
479 return
480 }
481 if len > SizeofSockaddrAny {
482 panic("RawSockaddrAny too small")
483 }
484 sa, err = anyToSockaddr(&rsa)
485 if err != nil {
486 Close(nfd)
487 nfd = 0
488 }
489 return
490}
491
492func Getsockname(fd int) (sa Sockaddr, err error) {
493 var rsa RawSockaddrAny
494 var len _Socklen = SizeofSockaddrAny
495 if err = getsockname(fd, &rsa, &len); err != nil {
496 return
497 }
498 return anyToSockaddr(&rsa)
499}
500
501func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
502 vallen := _Socklen(4)
503 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
504 return value, err
505}
506
507func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
508 var value IPMreq
509 vallen := _Socklen(SizeofIPMreq)
510 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
511 return &value, err
512}
513
514func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
515 var value IPMreqn
516 vallen := _Socklen(SizeofIPMreqn)
517 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
518 return &value, err
519}
520
521func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
522 var value IPv6Mreq
523 vallen := _Socklen(SizeofIPv6Mreq)
524 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
525 return &value, err
526}
527
528func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
529 var value IPv6MTUInfo
530 vallen := _Socklen(SizeofIPv6MTUInfo)
531 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
532 return &value, err
533}
534
535func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
536 var value ICMPv6Filter
537 vallen := _Socklen(SizeofICMPv6Filter)
538 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
539 return &value, err
540}
541
542func GetsockoptUcred(fd, level, opt int) (*Ucred, error) {
543 var value Ucred
544 vallen := _Socklen(SizeofUcred)
545 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
546 return &value, err
547}
548
549func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
550 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
551}
552
553func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
554 var msg Msghdr
555 var rsa RawSockaddrAny
556 msg.Name = (*byte)(unsafe.Pointer(&rsa))
557 msg.Namelen = uint32(SizeofSockaddrAny)
558 var iov Iovec
559 if len(p) > 0 {
560 iov.Base = (*byte)(unsafe.Pointer(&p[0]))
561 iov.SetLen(len(p))
562 }
563 var dummy byte
564 if len(oob) > 0 {
565 // receive at least one normal byte
566 if len(p) == 0 {
567 iov.Base = &dummy
568 iov.SetLen(1)
569 }
570 msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
571 msg.SetControllen(len(oob))
572 }
573 msg.Iov = &iov
574 msg.Iovlen = 1
575 if n, err = recvmsg(fd, &msg, flags); err != nil {
576 return
577 }
578 oobn = int(msg.Controllen)
579 recvflags = int(msg.Flags)
580 // source address is only specified if the socket is unconnected
581 if rsa.Addr.Family != AF_UNSPEC {
582 from, err = anyToSockaddr(&rsa)
583 }
584 return
585}
586
587func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
588 _, err = SendmsgN(fd, p, oob, to, flags)
589 return
590}
591
592func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
593 var ptr unsafe.Pointer
594 var salen _Socklen
595 if to != nil {
596 var err error
597 ptr, salen, err = to.sockaddr()
598 if err != nil {
599 return 0, err
600 }
601 }
602 var msg Msghdr
603 msg.Name = (*byte)(unsafe.Pointer(ptr))
604 msg.Namelen = uint32(salen)
605 var iov Iovec
606 if len(p) > 0 {
607 iov.Base = (*byte)(unsafe.Pointer(&p[0]))
608 iov.SetLen(len(p))
609 }
610 var dummy byte
611 if len(oob) > 0 {
612 // send at least one normal byte
613 if len(p) == 0 {
614 iov.Base = &dummy
615 iov.SetLen(1)
616 }
617 msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
618 msg.SetControllen(len(oob))
619 }
620 msg.Iov = &iov
621 msg.Iovlen = 1
622 if n, err = sendmsg(fd, &msg, flags); err != nil {
623 return 0, err
624 }
625 if len(oob) > 0 && len(p) == 0 {
626 n = 0
627 }
628 return n, nil
629}
630
631// BindToDevice binds the socket associated with fd to device.
632func BindToDevice(fd int, device string) (err error) {
633 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
634}
635
636//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
637
638func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
639 // The peek requests are machine-size oriented, so we wrap it
640 // to retrieve arbitrary-length data.
641
642 // The ptrace syscall differs from glibc's ptrace.
643 // Peeks returns the word in *data, not as the return value.
644
645 var buf [sizeofPtr]byte
646
647 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned
648 // access (PEEKUSER warns that it might), but if we don't
649 // align our reads, we might straddle an unmapped page
650 // boundary and not get the bytes leading up to the page
651 // boundary.
652 n := 0
653 if addr%sizeofPtr != 0 {
654 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
655 if err != nil {
656 return 0, err
657 }
658 n += copy(out, buf[addr%sizeofPtr:])
659 out = out[n:]
660 }
661
662 // Remainder.
663 for len(out) > 0 {
664 // We use an internal buffer to guarantee alignment.
665 // It's not documented if this is necessary, but we're paranoid.
666 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
667 if err != nil {
668 return n, err
669 }
670 copied := copy(out, buf[0:])
671 n += copied
672 out = out[copied:]
673 }
674
675 return n, nil
676}
677
678func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
679 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
680}
681
682func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
683 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
684}
685
686func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
687 // As for ptracePeek, we need to align our accesses to deal
688 // with the possibility of straddling an invalid page.
689
690 // Leading edge.
691 n := 0
692 if addr%sizeofPtr != 0 {
693 var buf [sizeofPtr]byte
694 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
695 if err != nil {
696 return 0, err
697 }
698 n += copy(buf[addr%sizeofPtr:], data)
699 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
700 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
701 if err != nil {
702 return 0, err
703 }
704 data = data[n:]
705 }
706
707 // Interior.
708 for len(data) > sizeofPtr {
709 word := *((*uintptr)(unsafe.Pointer(&data[0])))
710 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
711 if err != nil {
712 return n, err
713 }
714 n += sizeofPtr
715 data = data[sizeofPtr:]
716 }
717
718 // Trailing edge.
719 if len(data) > 0 {
720 var buf [sizeofPtr]byte
721 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
722 if err != nil {
723 return n, err
724 }
725 copy(buf[0:], data)
726 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
727 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
728 if err != nil {
729 return n, err
730 }
731 n += len(data)
732 }
733
734 return n, nil
735}
736
737func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
738 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
739}
740
741func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
742 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
743}
744
745func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
746 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout)))
747}
748
749func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
750 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs)))
751}
752
753func PtraceSetOptions(pid int, options int) (err error) {
754 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
755}
756
757func PtraceGetEventMsg(pid int) (msg uint, err error) {
758 var data _C_long
759 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
760 msg = uint(data)
761 return
762}
763
764func PtraceCont(pid int, signal int) (err error) {
765 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
766}
767
768func PtraceSyscall(pid int, signal int) (err error) {
769 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal))
770}
771
772func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
773
774func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
775
776func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
777
778//sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
779
780func Reboot(cmd int) (err error) {
781 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
782}
783
784func clen(n []byte) int {
785 for i := 0; i < len(n); i++ {
786 if n[i] == 0 {
787 return i
788 }
789 }
790 return len(n)
791}
792
793func ReadDirent(fd int, buf []byte) (n int, err error) {
794 return Getdents(fd, buf)
795}
796
797func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) {
798 origlen := len(buf)
799 count = 0
800 for max != 0 && len(buf) > 0 {
801 dirent := (*Dirent)(unsafe.Pointer(&buf[0]))
802 buf = buf[dirent.Reclen:]
803 if dirent.Ino == 0 { // File absent in directory.
804 continue
805 }
806 bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
807 var name = string(bytes[0:clen(bytes[:])])
808 if name == "." || name == ".." { // Useless names
809 continue
810 }
811 max--
812 count++
813 names = append(names, name)
814 }
815 return origlen - len(buf), count, names
816}
817
818//sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error)
819
820func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
821 // Certain file systems get rather angry and EINVAL if you give
822 // them an empty string of data, rather than NULL.
823 if data == "" {
824 return mount(source, target, fstype, flags, nil)
825 }
826 datap, err := BytePtrFromString(data)
827 if err != nil {
828 return err
829 }
830 return mount(source, target, fstype, flags, datap)
831}
832
833// Sendto
834// Recvfrom
835// Socketpair
836
837/*
838 * Direct access
839 */
840//sys Acct(path string) (err error)
841//sys Adjtimex(buf *Timex) (state int, err error)
842//sys Chdir(path string) (err error)
843//sys Chroot(path string) (err error)
844//sys ClockGettime(clockid int32, time *Timespec) (err error)
845//sys Close(fd int) (err error)
846//sys Dup(oldfd int) (fd int, err error)
847//sys Dup3(oldfd int, newfd int, flags int) (err error)
848//sysnb EpollCreate(size int) (fd int, err error)
849//sysnb EpollCreate1(flag int) (fd int, err error)
850//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
851//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
852//sys Exit(code int) = SYS_EXIT_GROUP
853//sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
854//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
855//sys Fchdir(fd int) (err error)
856//sys Fchmod(fd int, mode uint32) (err error)
857//sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
858//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
859//sys fcntl(fd int, cmd int, arg int) (val int, err error)
860//sys Fdatasync(fd int) (err error)
861//sys Flock(fd int, how int) (err error)
862//sys Fsync(fd int) (err error)
863//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
864//sysnb Getpgid(pid int) (pgid int, err error)
865
866func Getpgrp() (pid int) {
867 pid, _ = Getpgid(0)
868 return
869}
870
871//sysnb Getpid() (pid int)
872//sysnb Getppid() (ppid int)
873//sys Getpriority(which int, who int) (prio int, err error)
874//sysnb Getrusage(who int, rusage *Rusage) (err error)
875//sysnb Gettid() (tid int)
876//sys Getxattr(path string, attr string, dest []byte) (sz int, err error)
877//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
878//sysnb InotifyInit1(flags int) (fd int, err error)
879//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
880//sysnb Kill(pid int, sig syscall.Signal) (err error)
881//sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG
882//sys Listxattr(path string, dest []byte) (sz int, err error)
883//sys Mkdirat(dirfd int, path string, mode uint32) (err error)
884//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
885//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
886//sys Pause() (err error)
887//sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT
888//sysnb prlimit(pid int, resource int, old *Rlimit, newlimit *Rlimit) (err error) = SYS_PRLIMIT64
889//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error)
890//sys read(fd int, p []byte) (n int, err error)
891//sys Removexattr(path string, attr string) (err error)
892//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
893//sys Setdomainname(p []byte) (err error)
894//sys Sethostname(p []byte) (err error)
895//sysnb Setpgid(pid int, pgid int) (err error)
896//sysnb Setsid() (pid int, err error)
897//sysnb Settimeofday(tv *Timeval) (err error)
898
899// issue 1435.
900// On linux Setuid and Setgid only affects the current thread, not the process.
901// This does not match what most callers expect so we must return an error
902// here rather than letting the caller think that the call succeeded.
903
904func Setuid(uid int) (err error) {
905 return EOPNOTSUPP
906}
907
908func Setgid(uid int) (err error) {
909 return EOPNOTSUPP
910}
911
912//sys Setpriority(which int, who int, prio int) (err error)
913//sys Setxattr(path string, attr string, data []byte, flags int) (err error)
914//sys Sync()
915//sysnb Sysinfo(info *Sysinfo_t) (err error)
916//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
917//sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error)
918//sysnb Times(tms *Tms) (ticks uintptr, err error)
919//sysnb Umask(mask int) (oldmask int)
920//sysnb Uname(buf *Utsname) (err error)
921//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
922//sys Unshare(flags int) (err error)
923//sys Ustat(dev int, ubuf *Ustat_t) (err error)
924//sys Utime(path string, buf *Utimbuf) (err error)
925//sys write(fd int, p []byte) (n int, err error)
926//sys exitThread(code int) (err error) = SYS_EXIT
927//sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ
928//sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE
929
930// mmap varies by architecture; see syscall_linux_*.go.
931//sys munmap(addr uintptr, length uintptr) (err error)
932
933var mapper = &mmapper{
934 active: make(map[*byte][]byte),
935 mmap: mmap,
936 munmap: munmap,
937}
938
939func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
940 return mapper.Mmap(fd, offset, length, prot, flags)
941}
942
943func Munmap(b []byte) (err error) {
944 return mapper.Munmap(b)
945}
946
947//sys Madvise(b []byte, advice int) (err error)
948//sys Mprotect(b []byte, prot int) (err error)
949//sys Mlock(b []byte) (err error)
950//sys Munlock(b []byte) (err error)
951//sys Mlockall(flags int) (err error)
952//sys Munlockall() (err error)
953
954/*
955 * Unimplemented
956 */
957// AddKey
958// AfsSyscall
959// Alarm
960// ArchPrctl
961// Brk
962// Capget
963// Capset
964// ClockGetres
965// ClockNanosleep
966// ClockSettime
967// Clone
968// CreateModule
969// DeleteModule
970// EpollCtlOld
971// EpollPwait
972// EpollWaitOld
973// Eventfd
974// Execve
975// Fgetxattr
976// Flistxattr
977// Fork
978// Fremovexattr
979// Fsetxattr
980// Futex
981// GetKernelSyms
982// GetMempolicy
983// GetRobustList
984// GetThreadArea
985// Getitimer
986// Getpmsg
987// IoCancel
988// IoDestroy
989// IoGetevents
990// IoSetup
991// IoSubmit
992// Ioctl
993// IoprioGet
994// IoprioSet
995// KexecLoad
996// Keyctl
997// Lgetxattr
998// Llistxattr
999// LookupDcookie
1000// Lremovexattr
1001// Lsetxattr
1002// Mbind
1003// MigratePages
1004// Mincore
1005// ModifyLdt
1006// Mount
1007// MovePages
1008// Mprotect
1009// MqGetsetattr
1010// MqNotify
1011// MqOpen
1012// MqTimedreceive
1013// MqTimedsend
1014// MqUnlink
1015// Mremap
1016// Msgctl
1017// Msgget
1018// Msgrcv
1019// Msgsnd
1020// Msync
1021// Newfstatat
1022// Nfsservctl
1023// Personality
1024// Poll
1025// Ppoll
1026// Pselect6
1027// Ptrace
1028// Putpmsg
1029// QueryModule
1030// Quotactl
1031// Readahead
1032// Readv
1033// RemapFilePages
1034// RequestKey
1035// RestartSyscall
1036// RtSigaction
1037// RtSigpending
1038// RtSigprocmask
1039// RtSigqueueinfo
1040// RtSigreturn
1041// RtSigsuspend
1042// RtSigtimedwait
1043// SchedGetPriorityMax
1044// SchedGetPriorityMin
1045// SchedGetaffinity
1046// SchedGetparam
1047// SchedGetscheduler
1048// SchedRrGetInterval
1049// SchedSetaffinity
1050// SchedSetparam
1051// SchedYield
1052// Security
1053// Semctl
1054// Semget
1055// Semop
1056// Semtimedop
1057// SetMempolicy
1058// SetRobustList
1059// SetThreadArea
1060// SetTidAddress
1061// Shmat
1062// Shmctl
1063// Shmdt
1064// Shmget
1065// Sigaltstack
1066// Signalfd
1067// Swapoff
1068// Swapon
1069// Sysfs
1070// TimerCreate
1071// TimerDelete
1072// TimerGetoverrun
1073// TimerGettime
1074// TimerSettime
1075// Timerfd
1076// Tkill (obsolete)
1077// Tuxcall
1078// Umount2
1079// Uselib
1080// Utimensat
1081// Vfork
1082// Vhangup
1083// Vmsplice
1084// Vserver
1085// Waitid
1086// _Sysctl
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