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 // ParseDirent parses up to max directory entries in buf, 79 // appending the names to names. It returns the number 80 // bytes consumed from buf, the number of entries added 81 // to names, and the new names slice. 82 func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) { 83 origlen := len(buf) 84 for max != 0 && len(buf) > 0 { 85 dirent := (*Dirent)(unsafe.Pointer(&buf[0])) 86 if dirent.Reclen == 0 { 87 buf = nil 88 break 89 } 90 buf = buf[dirent.Reclen:] 91 if dirent.Ino == 0 { // File absent in directory. 92 continue 93 } 94 bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0])) 95 var name = string(bytes[0:dirent.Namlen]) 96 if name == "." || name == ".." { // Useless names 97 continue 98 } 99 max-- 100 count++ 101 names = append(names, name) 102 } 103 return origlen - len(buf), count, names 104 } 105 106 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 107 func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 108 func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 109 110 const ( 111 attrBitMapCount = 5 112 attrCmnFullpath = 0x08000000 113 ) 114 115 type attrList struct { 116 bitmapCount uint16 117 _ uint16 118 CommonAttr uint32 119 VolAttr uint32 120 DirAttr uint32 121 FileAttr uint32 122 Forkattr uint32 123 } 124 125 func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { 126 if len(attrBuf) < 4 { 127 return nil, errorspkg.New("attrBuf too small") 128 } 129 attrList.bitmapCount = attrBitMapCount 130 131 var _p0 *byte 132 _p0, err = BytePtrFromString(path) 133 if err != nil { 134 return nil, err 135 } 136 137 _, _, e1 := Syscall6( 138 SYS_GETATTRLIST, 139 uintptr(unsafe.Pointer(_p0)), 140 uintptr(unsafe.Pointer(&attrList)), 141 uintptr(unsafe.Pointer(&attrBuf[0])), 142 uintptr(len(attrBuf)), 143 uintptr(options), 144 0, 145 ) 146 use(unsafe.Pointer(_p0)) 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 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 510
