github.com/aayushi-bansal/sys@v0.0.0-20180118120756-90d962a959d8/unix/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 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 func direntIno(buf []byte) (uint64, bool) { 80 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 81 } 82 83 func direntReclen(buf []byte) (uint64, bool) { 84 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 85 } 86 87 func direntNamlen(buf []byte) (uint64, bool) { 88 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) 89 } 90 91 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 92 func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 93 func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 94 95 const ( 96 attrBitMapCount = 5 97 attrCmnFullpath = 0x08000000 98 ) 99 100 type attrList struct { 101 bitmapCount uint16 102 _ uint16 103 CommonAttr uint32 104 VolAttr uint32 105 DirAttr uint32 106 FileAttr uint32 107 Forkattr uint32 108 } 109 110 func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { 111 if len(attrBuf) < 4 { 112 return nil, errorspkg.New("attrBuf too small") 113 } 114 attrList.bitmapCount = attrBitMapCount 115 116 var _p0 *byte 117 _p0, err = BytePtrFromString(path) 118 if err != nil { 119 return nil, err 120 } 121 122 _, _, e1 := Syscall6( 123 SYS_GETATTRLIST, 124 uintptr(unsafe.Pointer(_p0)), 125 uintptr(unsafe.Pointer(&attrList)), 126 uintptr(unsafe.Pointer(&attrBuf[0])), 127 uintptr(len(attrBuf)), 128 uintptr(options), 129 0, 130 ) 131 if e1 != 0 { 132 return nil, e1 133 } 134 size := *(*uint32)(unsafe.Pointer(&attrBuf[0])) 135 136 // dat is the section of attrBuf that contains valid data, 137 // without the 4 byte length header. All attribute offsets 138 // are relative to dat. 139 dat := attrBuf 140 if int(size) < len(attrBuf) { 141 dat = dat[:size] 142 } 143 dat = dat[4:] // remove length prefix 144 145 for i := uint32(0); int(i) < len(dat); { 146 header := dat[i:] 147 if len(header) < 8 { 148 return attrs, errorspkg.New("truncated attribute header") 149 } 150 datOff := *(*int32)(unsafe.Pointer(&header[0])) 151 attrLen := *(*uint32)(unsafe.Pointer(&header[4])) 152 if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) { 153 return attrs, errorspkg.New("truncated results; attrBuf too small") 154 } 155 end := uint32(datOff) + attrLen 156 attrs = append(attrs, dat[datOff:end]) 157 i = end 158 if r := i % 4; r != 0 { 159 i += (4 - r) 160 } 161 } 162 return 163 } 164 165 //sysnb pipe() (r int, w int, err error) 166 167 func Pipe(p []int) (err error) { 168 if len(p) != 2 { 169 return EINVAL 170 } 171 p[0], p[1], err = pipe() 172 return 173 } 174 175 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 176 var _p0 unsafe.Pointer 177 var bufsize uintptr 178 if len(buf) > 0 { 179 _p0 = unsafe.Pointer(&buf[0]) 180 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 181 } 182 r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), bufsize, uintptr(flags)) 183 n = int(r0) 184 if e1 != 0 { 185 err = e1 186 } 187 return 188 } 189 190 func setattrlistTimes(path string, times []Timespec, flags int) error { 191 _p0, err := BytePtrFromString(path) 192 if err != nil { 193 return err 194 } 195 196 var attrList attrList 197 attrList.bitmapCount = ATTR_BIT_MAP_COUNT 198 attrList.CommonAttr = ATTR_CMN_MODTIME | ATTR_CMN_ACCTIME 199 200 // order is mtime, atime: the opposite of Chtimes 201 attributes := [2]Timespec{times[1], times[0]} 202 options := 0 203 if flags&AT_SYMLINK_NOFOLLOW != 0 { 204 options |= FSOPT_NOFOLLOW 205 } 206 _, _, e1 := Syscall6( 207 SYS_SETATTRLIST, 208 uintptr(unsafe.Pointer(_p0)), 209 uintptr(unsafe.Pointer(&attrList)), 210 uintptr(unsafe.Pointer(&attributes)), 211 uintptr(unsafe.Sizeof(attributes)), 212 uintptr(options), 213 0, 214 ) 215 if e1 != 0 { 216 return e1 217 } 218 return nil 219 } 220 221 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) error { 222 // Darwin doesn't support SYS_UTIMENSAT 223 return ENOSYS 224 } 225 226 /* 227 * Wrapped 228 */ 229 230 //sys kill(pid int, signum int, posix int) (err error) 231 232 func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) } 233 234 //sys ioctl(fd int, req uint, arg uintptr) (err error) 235 236 // ioctl itself should not be exposed directly, but additional get/set 237 // functions for specific types are permissible. 238 239 // IoctlSetInt performs an ioctl operation which sets an integer value 240 // on fd, using the specified request number. 241 func IoctlSetInt(fd int, req uint, value int) error { 242 return ioctl(fd, req, uintptr(value)) 243 } 244 245 func IoctlSetWinsize(fd int, req uint, value *Winsize) error { 246 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 247 } 248 249 func IoctlSetTermios(fd int, req uint, value *Termios) error { 250 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 251 } 252 253 // IoctlGetInt performs an ioctl operation which gets an integer value 254 // from fd, using the specified request number. 255 func IoctlGetInt(fd int, req uint) (int, error) { 256 var value int 257 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 258 return value, err 259 } 260 261 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 262 var value Winsize 263 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 264 return &value, err 265 } 266 267 func IoctlGetTermios(fd int, req uint) (*Termios, error) { 268 var value Termios 269 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 270 return &value, err 271 } 272 273 func Uname(uname *Utsname) error { 274 mib := []_C_int{CTL_KERN, KERN_OSTYPE} 275 n := unsafe.Sizeof(uname.Sysname) 276 if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil { 277 return err 278 } 279 280 mib = []_C_int{CTL_KERN, KERN_HOSTNAME} 281 n = unsafe.Sizeof(uname.Nodename) 282 if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil { 283 return err 284 } 285 286 mib = []_C_int{CTL_KERN, KERN_OSRELEASE} 287 n = unsafe.Sizeof(uname.Release) 288 if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil { 289 return err 290 } 291 292 mib = []_C_int{CTL_KERN, KERN_VERSION} 293 n = unsafe.Sizeof(uname.Version) 294 if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil { 295 return err 296 } 297 298 // The version might have newlines or tabs in it, convert them to 299 // spaces. 300 for i, b := range uname.Version { 301 if b == '\n' || b == '\t' { 302 if i == len(uname.Version)-1 { 303 uname.Version[i] = 0 304 } else { 305 uname.Version[i] = ' ' 306 } 307 } 308 } 309 310 mib = []_C_int{CTL_HW, HW_MACHINE} 311 n = unsafe.Sizeof(uname.Machine) 312 if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil { 313 return err 314 } 315 316 return nil 317 } 318 319 /* 320 * Exposed directly 321 */ 322 //sys Access(path string, mode uint32) (err error) 323 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 324 //sys Chdir(path string) (err error) 325 //sys Chflags(path string, flags int) (err error) 326 //sys Chmod(path string, mode uint32) (err error) 327 //sys Chown(path string, uid int, gid int) (err error) 328 //sys Chroot(path string) (err error) 329 //sys Close(fd int) (err error) 330 //sys Dup(fd int) (nfd int, err error) 331 //sys Dup2(from int, to int) (err error) 332 //sys Exchangedata(path1 string, path2 string, options int) (err error) 333 //sys Exit(code int) 334 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 335 //sys Fchdir(fd int) (err error) 336 //sys Fchflags(fd int, flags int) (err error) 337 //sys Fchmod(fd int, mode uint32) (err error) 338 //sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) 339 //sys Fchown(fd int, uid int, gid int) (err error) 340 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 341 //sys Flock(fd int, how int) (err error) 342 //sys Fpathconf(fd int, name int) (val int, err error) 343 //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 344 //sys Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64 345 //sys Fsync(fd int) (err error) 346 //sys Ftruncate(fd int, length int64) (err error) 347 //sys Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64 348 //sys Getdtablesize() (size int) 349 //sysnb Getegid() (egid int) 350 //sysnb Geteuid() (uid int) 351 //sysnb Getgid() (gid int) 352 //sysnb Getpgid(pid int) (pgid int, err error) 353 //sysnb Getpgrp() (pgrp int) 354 //sysnb Getpid() (pid int) 355 //sysnb Getppid() (ppid int) 356 //sys Getpriority(which int, who int) (prio int, err error) 357 //sysnb Getrlimit(which int, lim *Rlimit) (err error) 358 //sysnb Getrusage(who int, rusage *Rusage) (err error) 359 //sysnb Getsid(pid int) (sid int, err error) 360 //sysnb Getuid() (uid int) 361 //sysnb Issetugid() (tainted bool) 362 //sys Kqueue() (fd int, err error) 363 //sys Lchown(path string, uid int, gid int) (err error) 364 //sys Link(path string, link string) (err error) 365 //sys Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) 366 //sys Listen(s int, backlog int) (err error) 367 //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 368 //sys Mkdir(path string, mode uint32) (err error) 369 //sys Mkdirat(dirfd int, path string, mode uint32) (err error) 370 //sys Mkfifo(path string, mode uint32) (err error) 371 //sys Mknod(path string, mode uint32, dev int) (err error) 372 //sys Open(path string, mode int, perm uint32) (fd int, err error) 373 //sys Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) 374 //sys Pathconf(path string, name int) (val int, err error) 375 //sys Pread(fd int, p []byte, offset int64) (n int, err error) 376 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 377 //sys read(fd int, p []byte) (n int, err error) 378 //sys Readlink(path string, buf []byte) (n int, err error) 379 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 380 //sys Rename(from string, to string) (err error) 381 //sys Renameat(fromfd int, from string, tofd int, to string) (err error) 382 //sys Revoke(path string) (err error) 383 //sys Rmdir(path string) (err error) 384 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 385 //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 386 //sys Setegid(egid int) (err error) 387 //sysnb Seteuid(euid int) (err error) 388 //sysnb Setgid(gid int) (err error) 389 //sys Setlogin(name string) (err error) 390 //sysnb Setpgid(pid int, pgid int) (err error) 391 //sys Setpriority(which int, who int, prio int) (err error) 392 //sys Setprivexec(flag int) (err error) 393 //sysnb Setregid(rgid int, egid int) (err error) 394 //sysnb Setreuid(ruid int, euid int) (err error) 395 //sysnb Setrlimit(which int, lim *Rlimit) (err error) 396 //sysnb Setsid() (pid int, err error) 397 //sysnb Settimeofday(tp *Timeval) (err error) 398 //sysnb Setuid(uid int) (err error) 399 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 400 //sys Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64 401 //sys Symlink(path string, link string) (err error) 402 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 403 //sys Sync() (err error) 404 //sys Truncate(path string, length int64) (err error) 405 //sys Umask(newmask int) (oldmask int) 406 //sys Undelete(path string) (err error) 407 //sys Unlink(path string) (err error) 408 //sys Unlinkat(dirfd int, path string, flags int) (err error) 409 //sys Unmount(path string, flags int) (err error) 410 //sys write(fd int, p []byte) (n int, err error) 411 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 412 //sys munmap(addr uintptr, length uintptr) (err error) 413 //sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 414 //sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 415 416 /* 417 * Unimplemented 418 */ 419 // Profil 420 // Sigaction 421 // Sigprocmask 422 // Getlogin 423 // Sigpending 424 // Sigaltstack 425 // Ioctl 426 // Reboot 427 // Execve 428 // Vfork 429 // Sbrk 430 // Sstk 431 // Ovadvise 432 // Mincore 433 // Setitimer 434 // Swapon 435 // Select 436 // Sigsuspend 437 // Readv 438 // Writev 439 // Nfssvc 440 // Getfh 441 // Quotactl 442 // Mount 443 // Csops 444 // Waitid 445 // Add_profil 446 // Kdebug_trace 447 // Sigreturn 448 // Atsocket 449 // Kqueue_from_portset_np 450 // Kqueue_portset 451 // Getattrlist 452 // Setattrlist 453 // Getdirentriesattr 454 // Searchfs 455 // Delete 456 // Copyfile 457 // Watchevent 458 // Waitevent 459 // Modwatch 460 // Getxattr 461 // Fgetxattr 462 // Setxattr 463 // Fsetxattr 464 // Removexattr 465 // Fremovexattr 466 // Listxattr 467 // Flistxattr 468 // Fsctl 469 // Initgroups 470 // Posix_spawn 471 // Nfsclnt 472 // Fhopen 473 // Minherit 474 // Semsys 475 // Msgsys 476 // Shmsys 477 // Semctl 478 // Semget 479 // Semop 480 // Msgctl 481 // Msgget 482 // Msgsnd 483 // Msgrcv 484 // Shmat 485 // Shmctl 486 // Shmdt 487 // Shmget 488 // Shm_open 489 // Shm_unlink 490 // Sem_open 491 // Sem_close 492 // Sem_unlink 493 // Sem_wait 494 // Sem_trywait 495 // Sem_post 496 // Sem_getvalue 497 // Sem_init 498 // Sem_destroy 499 // Open_extended 500 // Umask_extended 501 // Stat_extended 502 // Lstat_extended 503 // Fstat_extended 504 // Chmod_extended 505 // Fchmod_extended 506 // Access_extended 507 // Settid 508 // Gettid 509 // Setsgroups 510 // Getsgroups 511 // Setwgroups 512 // Getwgroups 513 // Mkfifo_extended 514 // Mkdir_extended 515 // Identitysvc 516 // Shared_region_check_np 517 // Shared_region_map_np 518 // __pthread_mutex_destroy 519 // __pthread_mutex_init 520 // __pthread_mutex_lock 521 // __pthread_mutex_trylock 522 // __pthread_mutex_unlock 523 // __pthread_cond_init 524 // __pthread_cond_destroy 525 // __pthread_cond_broadcast 526 // __pthread_cond_signal 527 // Setsid_with_pid 528 // __pthread_cond_timedwait 529 // Aio_fsync 530 // Aio_return 531 // Aio_suspend 532 // Aio_cancel 533 // Aio_error 534 // Aio_read 535 // Aio_write 536 // Lio_listio 537 // __pthread_cond_wait 538 // Iopolicysys 539 // __pthread_kill 540 // __pthread_sigmask 541 // __sigwait 542 // __disable_threadsignal 543 // __pthread_markcancel 544 // __pthread_canceled 545 // __semwait_signal 546 // Proc_info 547 // sendfile 548 // Stat64_extended 549 // Lstat64_extended 550 // Fstat64_extended 551 // __pthread_chdir 552 // __pthread_fchdir 553 // Audit 554 // Auditon 555 // Getauid 556 // Setauid 557 // Getaudit 558 // Setaudit 559 // Getaudit_addr 560 // Setaudit_addr 561 // Auditctl 562 // Bsdthread_create 563 // Bsdthread_terminate 564 // Stack_snapshot 565 // Bsdthread_register 566 // Workq_open 567 // Workq_ops 568 // __mac_execve 569 // __mac_syscall 570 // __mac_get_file 571 // __mac_set_file 572 // __mac_get_link 573 // __mac_set_link 574 // __mac_get_proc 575 // __mac_set_proc 576 // __mac_get_fd 577 // __mac_set_fd 578 // __mac_get_pid 579 // __mac_get_lcid 580 // __mac_get_lctx 581 // __mac_set_lctx 582 // Setlcid 583 // Read_nocancel 584 // Write_nocancel 585 // Open_nocancel 586 // Close_nocancel 587 // Wait4_nocancel 588 // Recvmsg_nocancel 589 // Sendmsg_nocancel 590 // Recvfrom_nocancel 591 // Accept_nocancel 592 // Fcntl_nocancel 593 // Select_nocancel 594 // Fsync_nocancel 595 // Connect_nocancel 596 // Sigsuspend_nocancel 597 // Readv_nocancel 598 // Writev_nocancel 599 // Sendto_nocancel 600 // Pread_nocancel 601 // Pwrite_nocancel 602 // Waitid_nocancel 603 // Poll_nocancel 604 // Msgsnd_nocancel 605 // Msgrcv_nocancel 606 // Sem_wait_nocancel 607 // Aio_suspend_nocancel 608 // __sigwait_nocancel 609 // __semwait_signal_nocancel 610 // __mac_mount 611 // __mac_get_mount 612 // __mac_getfsstat