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1 | // Copyright 2009,2010 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 | // Darwin 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 wrap | |
10 | // it in our own nicer implementation, either here or in | |
11 | // syscall_bsd.go or syscall_unix.go. | |
12 | ||
13 | package unix | |
14 | ||
15 | import ( | |
16 | errorspkg "errors" | |
17 | "syscall" | |
18 | "unsafe" | |
19 | ) | |
20 | ||
21 | const ImplementsGetwd = true | |
22 | ||
23 | func Getwd() (string, error) { | |
24 | buf := make([]byte, 2048) | |
25 | attrs, err := getAttrList(".", attrList{CommonAttr: attrCmnFullpath}, buf, 0) | |
26 | if err == nil && len(attrs) == 1 && len(attrs[0]) >= 2 { | |
27 | wd := string(attrs[0]) | |
28 | // Sanity check that it's an absolute path and ends | |
29 | // in a null byte, which we then strip. | |
30 | if wd[0] == '/' && wd[len(wd)-1] == 0 { | |
31 | return wd[:len(wd)-1], nil | |
32 | } | |
33 | } | |
34 | // If pkg/os/getwd.go gets ENOTSUP, it will fall back to the | |
35 | // slow algorithm. | |
36 | return "", ENOTSUP | |
37 | } | |
38 | ||
39 | type SockaddrDatalink struct { | |
40 | Len uint8 | |
41 | Family uint8 | |
42 | Index uint16 | |
43 | Type uint8 | |
44 | Nlen uint8 | |
45 | Alen uint8 | |
46 | Slen uint8 | |
47 | Data [12]int8 | |
48 | raw RawSockaddrDatalink | |
49 | } | |
50 | ||
51 | // Translate "kern.hostname" to []_C_int{0,1,2,3}. | |
52 | func nametomib(name string) (mib []_C_int, err error) { | |
53 | const siz = unsafe.Sizeof(mib[0]) | |
54 | ||
55 | // NOTE(rsc): It seems strange to set the buffer to have | |
56 | // size CTL_MAXNAME+2 but use only CTL_MAXNAME | |
57 | // as the size. I don't know why the +2 is here, but the | |
58 | // kernel uses +2 for its own implementation of this function. | |
59 | // I am scared that if we don't include the +2 here, the kernel | |
60 | // will silently write 2 words farther than we specify | |
61 | // and we'll get memory corruption. | |
62 | var buf [CTL_MAXNAME + 2]_C_int | |
63 | n := uintptr(CTL_MAXNAME) * siz | |
64 | ||
65 | p := (*byte)(unsafe.Pointer(&buf[0])) | |
66 | bytes, err := ByteSliceFromString(name) | |
67 | if err != nil { | |
68 | return nil, err | |
69 | } | |
70 | ||
71 | // Magic sysctl: "setting" 0.3 to a string name | |
72 | // lets you read back the array of integers form. | |
73 | if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { | |
74 | return nil, err | |
75 | } | |
76 | return buf[0 : n/siz], nil | |
77 | } | |
78 | ||
79 | // ParseDirent parses up to max directory entries in buf, | |
80 | // appending the names to names. It returns the number | |
81 | // bytes consumed from buf, the number of entries added | |
82 | // to names, and the new names slice. | |
83 | func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) { | |
84 | origlen := len(buf) | |
85 | for max != 0 && len(buf) > 0 { | |
86 | dirent := (*Dirent)(unsafe.Pointer(&buf[0])) | |
87 | if dirent.Reclen == 0 { | |
88 | buf = nil | |
89 | break | |
90 | } | |
91 | buf = buf[dirent.Reclen:] | |
92 | if dirent.Ino == 0 { // File absent in directory. | |
93 | continue | |
94 | } | |
95 | bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0])) | |
96 | var name = string(bytes[0:dirent.Namlen]) | |
97 | if name == "." || name == ".." { // Useless names | |
98 | continue | |
99 | } | |
100 | max-- | |
101 | count++ | |
102 | names = append(names, name) | |
103 | } | |
104 | return origlen - len(buf), count, names | |
105 | } | |
106 | ||
107 | //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) | |
108 | func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } | |
109 | func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } | |
110 | ||
111 | const ( | |
112 | attrBitMapCount = 5 | |
113 | attrCmnFullpath = 0x08000000 | |
114 | ) | |
115 | ||
116 | type attrList struct { | |
117 | bitmapCount uint16 | |
118 | _ uint16 | |
119 | CommonAttr uint32 | |
120 | VolAttr uint32 | |
121 | DirAttr uint32 | |
122 | FileAttr uint32 | |
123 | Forkattr uint32 | |
124 | } | |
125 | ||
126 | func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { | |
127 | if len(attrBuf) < 4 { | |
128 | return nil, errorspkg.New("attrBuf too small") | |
129 | } | |
130 | attrList.bitmapCount = attrBitMapCount | |
131 | ||
132 | var _p0 *byte | |
133 | _p0, err = BytePtrFromString(path) | |
134 | if err != nil { | |
135 | return nil, err | |
136 | } | |
137 | ||
138 | _, _, e1 := Syscall6( | |
139 | SYS_GETATTRLIST, | |
140 | uintptr(unsafe.Pointer(_p0)), | |
141 | uintptr(unsafe.Pointer(&attrList)), | |
142 | uintptr(unsafe.Pointer(&attrBuf[0])), | |
143 | uintptr(len(attrBuf)), | |
144 | uintptr(options), | |
145 | 0, | |
146 | ) | |
147 | if e1 != 0 { | |
148 | return nil, e1 | |
149 | } | |
150 | size := *(*uint32)(unsafe.Pointer(&attrBuf[0])) | |
151 | ||
152 | // dat is the section of attrBuf that contains valid data, | |
153 | // without the 4 byte length header. All attribute offsets | |
154 | // are relative to dat. | |
155 | dat := attrBuf | |
156 | if int(size) < len(attrBuf) { | |
157 | dat = dat[:size] | |
158 | } | |
159 | dat = dat[4:] // remove length prefix | |
160 | ||
161 | for i := uint32(0); int(i) < len(dat); { | |
162 | header := dat[i:] | |
163 | if len(header) < 8 { | |
164 | return attrs, errorspkg.New("truncated attribute header") | |
165 | } | |
166 | datOff := *(*int32)(unsafe.Pointer(&header[0])) | |
167 | attrLen := *(*uint32)(unsafe.Pointer(&header[4])) | |
168 | if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) { | |
169 | return attrs, errorspkg.New("truncated results; attrBuf too small") | |
170 | } | |
171 | end := uint32(datOff) + attrLen | |
172 | attrs = append(attrs, dat[datOff:end]) | |
173 | i = end | |
174 | if r := i % 4; r != 0 { | |
175 | i += (4 - r) | |
176 | } | |
177 | } | |
178 | return | |
179 | } | |
180 | ||
181 | //sysnb pipe() (r int, w int, err error) | |
182 | ||
183 | func Pipe(p []int) (err error) { | |
184 | if len(p) != 2 { | |
185 | return EINVAL | |
186 | } | |
187 | p[0], p[1], err = pipe() | |
188 | return | |
189 | } | |
190 | ||
191 | func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { | |
192 | var _p0 unsafe.Pointer | |
193 | var bufsize uintptr | |
194 | if len(buf) > 0 { | |
195 | _p0 = unsafe.Pointer(&buf[0]) | |
196 | bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) | |
197 | } | |
198 | r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), bufsize, uintptr(flags)) | |
199 | n = int(r0) | |
200 | if e1 != 0 { | |
201 | err = e1 | |
202 | } | |
203 | return | |
204 | } | |
205 | ||
206 | /* | |
207 | * Wrapped | |
208 | */ | |
209 | ||
210 | //sys kill(pid int, signum int, posix int) (err error) | |
211 | ||
212 | func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) } | |
213 | ||
214 | /* | |
215 | * Exposed directly | |
216 | */ | |
217 | //sys Access(path string, mode uint32) (err error) | |
218 | //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) | |
219 | //sys Chdir(path string) (err error) | |
220 | //sys Chflags(path string, flags int) (err error) | |
221 | //sys Chmod(path string, mode uint32) (err error) | |
222 | //sys Chown(path string, uid int, gid int) (err error) | |
223 | //sys Chroot(path string) (err error) | |
224 | //sys Close(fd int) (err error) | |
225 | //sys Dup(fd int) (nfd int, err error) | |
226 | //sys Dup2(from int, to int) (err error) | |
227 | //sys Exchangedata(path1 string, path2 string, options int) (err error) | |
228 | //sys Exit(code int) | |
229 | //sys Fchdir(fd int) (err error) | |
230 | //sys Fchflags(fd int, flags int) (err error) | |
231 | //sys Fchmod(fd int, mode uint32) (err error) | |
232 | //sys Fchown(fd int, uid int, gid int) (err error) | |
233 | //sys Flock(fd int, how int) (err error) | |
234 | //sys Fpathconf(fd int, name int) (val int, err error) | |
235 | //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 | |
236 | //sys Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64 | |
237 | //sys Fsync(fd int) (err error) | |
238 | //sys Ftruncate(fd int, length int64) (err error) | |
239 | //sys Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64 | |
240 | //sys Getdtablesize() (size int) | |
241 | //sysnb Getegid() (egid int) | |
242 | //sysnb Geteuid() (uid int) | |
243 | //sysnb Getgid() (gid int) | |
244 | //sysnb Getpgid(pid int) (pgid int, err error) | |
245 | //sysnb Getpgrp() (pgrp int) | |
246 | //sysnb Getpid() (pid int) | |
247 | //sysnb Getppid() (ppid int) | |
248 | //sys Getpriority(which int, who int) (prio int, err error) | |
249 | //sysnb Getrlimit(which int, lim *Rlimit) (err error) | |
250 | //sysnb Getrusage(who int, rusage *Rusage) (err error) | |
251 | //sysnb Getsid(pid int) (sid int, err error) | |
252 | //sysnb Getuid() (uid int) | |
253 | //sysnb Issetugid() (tainted bool) | |
254 | //sys Kqueue() (fd int, err error) | |
255 | //sys Lchown(path string, uid int, gid int) (err error) | |
256 | //sys Link(path string, link string) (err error) | |
257 | //sys Listen(s int, backlog int) (err error) | |
258 | //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 | |
259 | //sys Mkdir(path string, mode uint32) (err error) | |
260 | //sys Mkfifo(path string, mode uint32) (err error) | |
261 | //sys Mknod(path string, mode uint32, dev int) (err error) | |
262 | //sys Mlock(b []byte) (err error) | |
263 | //sys Mlockall(flags int) (err error) | |
264 | //sys Mprotect(b []byte, prot int) (err error) | |
265 | //sys Munlock(b []byte) (err error) | |
266 | //sys Munlockall() (err error) | |
267 | //sys Open(path string, mode int, perm uint32) (fd int, err error) | |
268 | //sys Pathconf(path string, name int) (val int, err error) | |
269 | //sys Pread(fd int, p []byte, offset int64) (n int, err error) | |
270 | //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) | |
271 | //sys read(fd int, p []byte) (n int, err error) | |
272 | //sys Readlink(path string, buf []byte) (n int, err error) | |
273 | //sys Rename(from string, to string) (err error) | |
274 | //sys Revoke(path string) (err error) | |
275 | //sys Rmdir(path string) (err error) | |
276 | //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK | |
277 | //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) | |
278 | //sys Setegid(egid int) (err error) | |
279 | //sysnb Seteuid(euid int) (err error) | |
280 | //sysnb Setgid(gid int) (err error) | |
281 | //sys Setlogin(name string) (err error) | |
282 | //sysnb Setpgid(pid int, pgid int) (err error) | |
283 | //sys Setpriority(which int, who int, prio int) (err error) | |
284 | //sys Setprivexec(flag int) (err error) | |
285 | //sysnb Setregid(rgid int, egid int) (err error) | |
286 | //sysnb Setreuid(ruid int, euid int) (err error) | |
287 | //sysnb Setrlimit(which int, lim *Rlimit) (err error) | |
288 | //sysnb Setsid() (pid int, err error) | |
289 | //sysnb Settimeofday(tp *Timeval) (err error) | |
290 | //sysnb Setuid(uid int) (err error) | |
291 | //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 | |
292 | //sys Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64 | |
293 | //sys Symlink(path string, link string) (err error) | |
294 | //sys Sync() (err error) | |
295 | //sys Truncate(path string, length int64) (err error) | |
296 | //sys Umask(newmask int) (oldmask int) | |
297 | //sys Undelete(path string) (err error) | |
298 | //sys Unlink(path string) (err error) | |
299 | //sys Unmount(path string, flags int) (err error) | |
300 | //sys write(fd int, p []byte) (n int, err error) | |
301 | //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) | |
302 | //sys munmap(addr uintptr, length uintptr) (err error) | |
303 | //sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ | |
304 | //sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE | |
305 | ||
306 | /* | |
307 | * Unimplemented | |
308 | */ | |
309 | // Profil | |
310 | // Sigaction | |
311 | // Sigprocmask | |
312 | // Getlogin | |
313 | // Sigpending | |
314 | // Sigaltstack | |
315 | // Ioctl | |
316 | // Reboot | |
317 | // Execve | |
318 | // Vfork | |
319 | // Sbrk | |
320 | // Sstk | |
321 | // Ovadvise | |
322 | // Mincore | |
323 | // Setitimer | |
324 | // Swapon | |
325 | // Select | |
326 | // Sigsuspend | |
327 | // Readv | |
328 | // Writev | |
329 | // Nfssvc | |
330 | // Getfh | |
331 | // Quotactl | |
332 | // Mount | |
333 | // Csops | |
334 | // Waitid | |
335 | // Add_profil | |
336 | // Kdebug_trace | |
337 | // Sigreturn | |
338 | // Mmap | |
339 | // Mlock | |
340 | // Munlock | |
341 | // Atsocket | |
342 | // Kqueue_from_portset_np | |
343 | // Kqueue_portset | |
344 | // Getattrlist | |
345 | // Setattrlist | |
346 | // Getdirentriesattr | |
347 | // Searchfs | |
348 | // Delete | |
349 | // Copyfile | |
350 | // Poll | |
351 | // Watchevent | |
352 | // Waitevent | |
353 | // Modwatch | |
354 | // Getxattr | |
355 | // Fgetxattr | |
356 | // Setxattr | |
357 | // Fsetxattr | |
358 | // Removexattr | |
359 | // Fremovexattr | |
360 | // Listxattr | |
361 | // Flistxattr | |
362 | // Fsctl | |
363 | // Initgroups | |
364 | // Posix_spawn | |
365 | // Nfsclnt | |
366 | // Fhopen | |
367 | // Minherit | |
368 | // Semsys | |
369 | // Msgsys | |
370 | // Shmsys | |
371 | // Semctl | |
372 | // Semget | |
373 | // Semop | |
374 | // Msgctl | |
375 | // Msgget | |
376 | // Msgsnd | |
377 | // Msgrcv | |
378 | // Shmat | |
379 | // Shmctl | |
380 | // Shmdt | |
381 | // Shmget | |
382 | // Shm_open | |
383 | // Shm_unlink | |
384 | // Sem_open | |
385 | // Sem_close | |
386 | // Sem_unlink | |
387 | // Sem_wait | |
388 | // Sem_trywait | |
389 | // Sem_post | |
390 | // Sem_getvalue | |
391 | // Sem_init | |
392 | // Sem_destroy | |
393 | // Open_extended | |
394 | // Umask_extended | |
395 | // Stat_extended | |
396 | // Lstat_extended | |
397 | // Fstat_extended | |
398 | // Chmod_extended | |
399 | // Fchmod_extended | |
400 | // Access_extended | |
401 | // Settid | |
402 | // Gettid | |
403 | // Setsgroups | |
404 | // Getsgroups | |
405 | // Setwgroups | |
406 | // Getwgroups | |
407 | // Mkfifo_extended | |
408 | // Mkdir_extended | |
409 | // Identitysvc | |
410 | // Shared_region_check_np | |
411 | // Shared_region_map_np | |
412 | // __pthread_mutex_destroy | |
413 | // __pthread_mutex_init | |
414 | // __pthread_mutex_lock | |
415 | // __pthread_mutex_trylock | |
416 | // __pthread_mutex_unlock | |
417 | // __pthread_cond_init | |
418 | // __pthread_cond_destroy | |
419 | // __pthread_cond_broadcast | |
420 | // __pthread_cond_signal | |
421 | // Setsid_with_pid | |
422 | // __pthread_cond_timedwait | |
423 | // Aio_fsync | |
424 | // Aio_return | |
425 | // Aio_suspend | |
426 | // Aio_cancel | |
427 | // Aio_error | |
428 | // Aio_read | |
429 | // Aio_write | |
430 | // Lio_listio | |
431 | // __pthread_cond_wait | |
432 | // Iopolicysys | |
433 | // Mlockall | |
434 | // Munlockall | |
435 | // __pthread_kill | |
436 | // __pthread_sigmask | |
437 | // __sigwait | |
438 | // __disable_threadsignal | |
439 | // __pthread_markcancel | |
440 | // __pthread_canceled | |
441 | // __semwait_signal | |
442 | // Proc_info | |
443 | // sendfile | |
444 | // Stat64_extended | |
445 | // Lstat64_extended | |
446 | // Fstat64_extended | |
447 | // __pthread_chdir | |
448 | // __pthread_fchdir | |
449 | // Audit | |
450 | // Auditon | |
451 | // Getauid | |
452 | // Setauid | |
453 | // Getaudit | |
454 | // Setaudit | |
455 | // Getaudit_addr | |
456 | // Setaudit_addr | |
457 | // Auditctl | |
458 | // Bsdthread_create | |
459 | // Bsdthread_terminate | |
460 | // Stack_snapshot | |
461 | // Bsdthread_register | |
462 | // Workq_open | |
463 | // Workq_ops | |
464 | // __mac_execve | |
465 | // __mac_syscall | |
466 | // __mac_get_file | |
467 | // __mac_set_file | |
468 | // __mac_get_link | |
469 | // __mac_set_link | |
470 | // __mac_get_proc | |
471 | // __mac_set_proc | |
472 | // __mac_get_fd | |
473 | // __mac_set_fd | |
474 | // __mac_get_pid | |
475 | // __mac_get_lcid | |
476 | // __mac_get_lctx | |
477 | // __mac_set_lctx | |
478 | // Setlcid | |
479 | // Read_nocancel | |
480 | // Write_nocancel | |
481 | // Open_nocancel | |
482 | // Close_nocancel | |
483 | // Wait4_nocancel | |
484 | // Recvmsg_nocancel | |
485 | // Sendmsg_nocancel | |
486 | // Recvfrom_nocancel | |
487 | // Accept_nocancel | |
488 | // Msync_nocancel | |
489 | // Fcntl_nocancel | |
490 | // Select_nocancel | |
491 | // Fsync_nocancel | |
492 | // Connect_nocancel | |
493 | // Sigsuspend_nocancel | |
494 | // Readv_nocancel | |
495 | // Writev_nocancel | |
496 | // Sendto_nocancel | |
497 | // Pread_nocancel | |
498 | // Pwrite_nocancel | |
499 | // Waitid_nocancel | |
500 | // Poll_nocancel | |
501 | // Msgsnd_nocancel | |
502 | // Msgrcv_nocancel | |
503 | // Sem_wait_nocancel | |
504 | // Aio_suspend_nocancel | |
505 | // __sigwait_nocancel | |
506 | // __semwait_signal_nocancel | |
507 | // __mac_mount | |
508 | // __mac_get_mount | |
509 | // __mac_getfsstat |