github.com/filosottile/go@v0.0.0-20170906193555-dbed9972d994/src/syscall/syscall_darwin.go (about) 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 syscall 14 15 import ( 16 errorspkg "errors" 17 "unsafe" 18 ) 19 20 const ImplementsGetwd = true 21 22 func Getwd() (string, error) { 23 buf := make([]byte, 2048) 24 attrs, err := getAttrList(".", attrList{CommonAttr: attrCmnFullpath}, buf, 0) 25 if err == nil && len(attrs) == 1 && len(attrs[0]) >= 2 { 26 wd := string(attrs[0]) 27 // Sanity check that it's an absolute path and ends 28 // in a null byte, which we then strip. 29 if wd[0] == '/' && wd[len(wd)-1] == 0 { 30 return wd[:len(wd)-1], nil 31 } 32 } 33 // If pkg/os/getwd.go gets ENOTSUP, it will fall back to the 34 // slow algorithm. 35 return "", ENOTSUP 36 } 37 38 type SockaddrDatalink struct { 39 Len uint8 40 Family uint8 41 Index uint16 42 Type uint8 43 Nlen uint8 44 Alen uint8 45 Slen uint8 46 Data [12]int8 47 raw RawSockaddrDatalink 48 } 49 50 // Translate "kern.hostname" to []_C_int{0,1,2,3}. 51 func nametomib(name string) (mib []_C_int, err error) { 52 const siz = unsafe.Sizeof(mib[0]) 53 54 // NOTE(rsc): It seems strange to set the buffer to have 55 // size CTL_MAXNAME+2 but use only CTL_MAXNAME 56 // as the size. I don't know why the +2 is here, but the 57 // kernel uses +2 for its own implementation of this function. 58 // I am scared that if we don't include the +2 here, the kernel 59 // will silently write 2 words farther than we specify 60 // and we'll get memory corruption. 61 var buf [CTL_MAXNAME + 2]_C_int 62 n := uintptr(CTL_MAXNAME) * siz 63 64 p := (*byte)(unsafe.Pointer(&buf[0])) 65 bytes, err := ByteSliceFromString(name) 66 if err != nil { 67 return nil, err 68 } 69 70 // Magic sysctl: "setting" 0.3 to a string name 71 // lets you read back the array of integers form. 72 if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { 73 return nil, err 74 } 75 return buf[0 : n/siz], nil 76 } 77 78 func direntIno(buf []byte) (uint64, bool) { 79 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 80 } 81 82 func direntReclen(buf []byte) (uint64, bool) { 83 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 84 } 85 86 func direntNamlen(buf []byte) (uint64, bool) { 87 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) 88 } 89 90 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 91 func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 92 func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 93 94 const ( 95 attrBitMapCount = 5 96 attrCmnFullpath = 0x08000000 97 ) 98 99 type attrList struct { 100 bitmapCount uint16 101 _ uint16 102 CommonAttr uint32 103 VolAttr uint32 104 DirAttr uint32 105 FileAttr uint32 106 Forkattr uint32 107 } 108 109 func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { 110 if len(attrBuf) < 4 { 111 return nil, errorspkg.New("attrBuf too small") 112 } 113 attrList.bitmapCount = attrBitMapCount 114 115 var _p0 *byte 116 _p0, err = BytePtrFromString(path) 117 if err != nil { 118 return nil, err 119 } 120 121 _, _, e1 := Syscall6( 122 SYS_GETATTRLIST, 123 uintptr(unsafe.Pointer(_p0)), 124 uintptr(unsafe.Pointer(&attrList)), 125 uintptr(unsafe.Pointer(&attrBuf[0])), 126 uintptr(len(attrBuf)), 127 uintptr(options), 128 0, 129 ) 130 if e1 != 0 { 131 return nil, e1 132 } 133 size := *(*uint32)(unsafe.Pointer(&attrBuf[0])) 134 135 // dat is the section of attrBuf that contains valid data, 136 // without the 4 byte length header. All attribute offsets 137 // are relative to dat. 138 dat := attrBuf 139 if int(size) < len(attrBuf) { 140 dat = dat[:size] 141 } 142 dat = dat[4:] // remove length prefix 143 144 for i := uint32(0); int(i) < len(dat); { 145 header := dat[i:] 146 if len(header) < 8 { 147 return attrs, errorspkg.New("truncated attribute header") 148 } 149 datOff := *(*int32)(unsafe.Pointer(&header[0])) 150 attrLen := *(*uint32)(unsafe.Pointer(&header[4])) 151 if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) { 152 return attrs, errorspkg.New("truncated results; attrBuf too small") 153 } 154 end := uint32(datOff) + attrLen 155 attrs = append(attrs, dat[datOff:end]) 156 i = end 157 if r := i % 4; r != 0 { 158 i += (4 - r) 159 } 160 } 161 return 162 } 163 164 //sysnb pipe() (r int, w int, err error) 165 166 func Pipe(p []int) (err error) { 167 if len(p) != 2 { 168 return EINVAL 169 } 170 p[0], p[1], err = pipe() 171 return 172 } 173 174 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 175 var _p0 unsafe.Pointer 176 var bufsize uintptr 177 if len(buf) > 0 { 178 _p0 = unsafe.Pointer(&buf[0]) 179 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 180 } 181 r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), bufsize, uintptr(flags)) 182 n = int(r0) 183 if e1 != 0 { 184 err = e1 185 } 186 return 187 } 188 189 func utimensat(dirfd int, path string, times *[2]Timespec, flag int) error { 190 // Darwin doesn't support SYS_UTIMENSAT 191 return ENOSYS 192 } 193 194 /* 195 * Wrapped 196 */ 197 198 //sys kill(pid int, signum int, posix int) (err error) 199 200 func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1) } 201 202 /* 203 * Exposed directly 204 */ 205 //sys Access(path string, mode uint32) (err error) 206 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 207 //sys Chdir(path string) (err error) 208 //sys Chflags(path string, flags int) (err error) 209 //sys Chmod(path string, mode uint32) (err error) 210 //sys Chown(path string, uid int, gid int) (err error) 211 //sys Chroot(path string) (err error) 212 //sys Close(fd int) (err error) 213 //sys Dup(fd int) (nfd int, err error) 214 //sys Dup2(from int, to int) (err error) 215 //sys Exchangedata(path1 string, path2 string, options int) (err error) 216 //sys Exit(code int) 217 //sys Fchdir(fd int) (err error) 218 //sys Fchflags(fd int, flags int) (err error) 219 //sys Fchmod(fd int, mode uint32) (err error) 220 //sys Fchown(fd int, uid int, gid int) (err error) 221 //sys Flock(fd int, how int) (err error) 222 //sys Fpathconf(fd int, name int) (val int, err error) 223 //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 224 //sys Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64 225 //sys Fsync(fd int) (err error) 226 //sys Ftruncate(fd int, length int64) (err error) 227 //sys Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64 228 //sys Getdtablesize() (size int) 229 //sysnb Getegid() (egid int) 230 //sysnb Geteuid() (uid int) 231 //sysnb Getgid() (gid int) 232 //sysnb Getpgid(pid int) (pgid int, err error) 233 //sysnb Getpgrp() (pgrp int) 234 //sysnb Getpid() (pid int) 235 //sysnb Getppid() (ppid int) 236 //sys Getpriority(which int, who int) (prio int, err error) 237 //sysnb Getrlimit(which int, lim *Rlimit) (err error) 238 //sysnb Getrusage(who int, rusage *Rusage) (err error) 239 //sysnb Getsid(pid int) (sid int, err error) 240 //sysnb Getuid() (uid int) 241 //sysnb Issetugid() (tainted bool) 242 //sys Kqueue() (fd int, err error) 243 //sys Lchown(path string, uid int, gid int) (err error) 244 //sys Link(path string, link string) (err error) 245 //sys Listen(s int, backlog int) (err error) 246 //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 247 //sys Mkdir(path string, mode uint32) (err error) 248 //sys Mkfifo(path string, mode uint32) (err error) 249 //sys Mknod(path string, mode uint32, dev int) (err error) 250 //sys Mlock(b []byte) (err error) 251 //sys Mlockall(flags int) (err error) 252 //sys Mprotect(b []byte, prot int) (err error) 253 //sys Munlock(b []byte) (err error) 254 //sys Munlockall() (err error) 255 //sys Open(path string, mode int, perm uint32) (fd int, err error) 256 //sys Pathconf(path string, name int) (val int, err error) 257 //sys Pread(fd int, p []byte, offset int64) (n int, err error) 258 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 259 //sys read(fd int, p []byte) (n int, err error) 260 //sys Readlink(path string, buf []byte) (n int, err error) 261 //sys Rename(from string, to string) (err error) 262 //sys Revoke(path string) (err error) 263 //sys Rmdir(path string) (err error) 264 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 265 //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 266 //sys Setegid(egid int) (err error) 267 //sysnb Seteuid(euid int) (err error) 268 //sysnb Setgid(gid int) (err error) 269 //sys Setlogin(name string) (err error) 270 //sysnb Setpgid(pid int, pgid int) (err error) 271 //sys Setpriority(which int, who int, prio int) (err error) 272 //sys Setprivexec(flag int) (err error) 273 //sysnb Setregid(rgid int, egid int) (err error) 274 //sysnb Setreuid(ruid int, euid int) (err error) 275 //sysnb Setrlimit(which int, lim *Rlimit) (err error) 276 //sysnb Setsid() (pid int, err error) 277 //sysnb Settimeofday(tp *Timeval) (err error) 278 //sysnb Setuid(uid int) (err error) 279 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 280 //sys Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64 281 //sys Symlink(path string, link string) (err error) 282 //sys Sync() (err error) 283 //sys Truncate(path string, length int64) (err error) 284 //sys Umask(newmask int) (oldmask int) 285 //sys Undelete(path string) (err error) 286 //sys Unlink(path string) (err error) 287 //sys Unmount(path string, flags int) (err error) 288 //sys write(fd int, p []byte) (n int, err error) 289 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 290 //sys munmap(addr uintptr, length uintptr) (err error) 291 //sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 292 //sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 293 294 /* 295 * Unimplemented 296 */ 297 // Profil 298 // Sigaction 299 // Sigprocmask 300 // Getlogin 301 // Sigpending 302 // Sigaltstack 303 // Ioctl 304 // Reboot 305 // Execve 306 // Vfork 307 // Sbrk 308 // Sstk 309 // Ovadvise 310 // Mincore 311 // Setitimer 312 // Swapon 313 // Select 314 // Sigsuspend 315 // Readv 316 // Writev 317 // Nfssvc 318 // Getfh 319 // Quotactl 320 // Mount 321 // Csops 322 // Waitid 323 // Add_profil 324 // Kdebug_trace 325 // Sigreturn 326 // Mmap 327 // Mlock 328 // Munlock 329 // Atsocket 330 // Kqueue_from_portset_np 331 // Kqueue_portset 332 // Getattrlist 333 // Setattrlist 334 // Getdirentriesattr 335 // Searchfs 336 // Delete 337 // Copyfile 338 // Poll 339 // Watchevent 340 // Waitevent 341 // Modwatch 342 // Getxattr 343 // Fgetxattr 344 // Setxattr 345 // Fsetxattr 346 // Removexattr 347 // Fremovexattr 348 // Listxattr 349 // Flistxattr 350 // Fsctl 351 // Initgroups 352 // Posix_spawn 353 // Nfsclnt 354 // Fhopen 355 // Minherit 356 // Semsys 357 // Msgsys 358 // Shmsys 359 // Semctl 360 // Semget 361 // Semop 362 // Msgctl 363 // Msgget 364 // Msgsnd 365 // Msgrcv 366 // Shmat 367 // Shmctl 368 // Shmdt 369 // Shmget 370 // Shm_open 371 // Shm_unlink 372 // Sem_open 373 // Sem_close 374 // Sem_unlink 375 // Sem_wait 376 // Sem_trywait 377 // Sem_post 378 // Sem_getvalue 379 // Sem_init 380 // Sem_destroy 381 // Open_extended 382 // Umask_extended 383 // Stat_extended 384 // Lstat_extended 385 // Fstat_extended 386 // Chmod_extended 387 // Fchmod_extended 388 // Access_extended 389 // Settid 390 // Gettid 391 // Setsgroups 392 // Getsgroups 393 // Setwgroups 394 // Getwgroups 395 // Mkfifo_extended 396 // Mkdir_extended 397 // Identitysvc 398 // Shared_region_check_np 399 // Shared_region_map_np 400 // __pthread_mutex_destroy 401 // __pthread_mutex_init 402 // __pthread_mutex_lock 403 // __pthread_mutex_trylock 404 // __pthread_mutex_unlock 405 // __pthread_cond_init 406 // __pthread_cond_destroy 407 // __pthread_cond_broadcast 408 // __pthread_cond_signal 409 // Setsid_with_pid 410 // __pthread_cond_timedwait 411 // Aio_fsync 412 // Aio_return 413 // Aio_suspend 414 // Aio_cancel 415 // Aio_error 416 // Aio_read 417 // Aio_write 418 // Lio_listio 419 // __pthread_cond_wait 420 // Iopolicysys 421 // Mlockall 422 // Munlockall 423 // __pthread_kill 424 // __pthread_sigmask 425 // __sigwait 426 // __disable_threadsignal 427 // __pthread_markcancel 428 // __pthread_canceled 429 // __semwait_signal 430 // Proc_info 431 // sendfile 432 // Stat64_extended 433 // Lstat64_extended 434 // Fstat64_extended 435 // __pthread_chdir 436 // __pthread_fchdir 437 // Audit 438 // Auditon 439 // Getauid 440 // Setauid 441 // Getaudit 442 // Setaudit 443 // Getaudit_addr 444 // Setaudit_addr 445 // Auditctl 446 // Bsdthread_create 447 // Bsdthread_terminate 448 // Stack_snapshot 449 // Bsdthread_register 450 // Workq_open 451 // Workq_ops 452 // __mac_execve 453 // __mac_syscall 454 // __mac_get_file 455 // __mac_set_file 456 // __mac_get_link 457 // __mac_set_link 458 // __mac_get_proc 459 // __mac_set_proc 460 // __mac_get_fd 461 // __mac_set_fd 462 // __mac_get_pid 463 // __mac_get_lcid 464 // __mac_get_lctx 465 // __mac_set_lctx 466 // Setlcid 467 // Read_nocancel 468 // Write_nocancel 469 // Open_nocancel 470 // Close_nocancel 471 // Wait4_nocancel 472 // Recvmsg_nocancel 473 // Sendmsg_nocancel 474 // Recvfrom_nocancel 475 // Accept_nocancel 476 // Msync_nocancel 477 // Fcntl_nocancel 478 // Select_nocancel 479 // Fsync_nocancel 480 // Connect_nocancel 481 // Sigsuspend_nocancel 482 // Readv_nocancel 483 // Writev_nocancel 484 // Sendto_nocancel 485 // Pread_nocancel 486 // Pwrite_nocancel 487 // Waitid_nocancel 488 // Poll_nocancel 489 // Msgsnd_nocancel 490 // Msgrcv_nocancel 491 // Sem_wait_nocancel 492 // Aio_suspend_nocancel 493 // __sigwait_nocancel 494 // __semwait_signal_nocancel 495 // __mac_mount 496 // __mac_get_mount 497 // __mac_getfsstat