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 13package unix 14 15import ( 16 "errors" 17 "syscall" 18 "unsafe" 19) 20 21const ImplementsGetwd = true 22 23func 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// SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets. 40type SockaddrDatalink struct { 41 Len uint8 42 Family uint8 43 Index uint16 44 Type uint8 45 Nlen uint8 46 Alen uint8 47 Slen uint8 48 Data [12]int8 49 raw RawSockaddrDatalink 50} 51 52// Translate "kern.hostname" to []_C_int{0,1,2,3}. 53func nametomib(name string) (mib []_C_int, err error) { 54 const siz = unsafe.Sizeof(mib[0]) 55 56 // NOTE(rsc): It seems strange to set the buffer to have 57 // size CTL_MAXNAME+2 but use only CTL_MAXNAME 58 // as the size. I don't know why the +2 is here, but the 59 // kernel uses +2 for its own implementation of this function. 60 // I am scared that if we don't include the +2 here, the kernel 61 // will silently write 2 words farther than we specify 62 // and we'll get memory corruption. 63 var buf [CTL_MAXNAME + 2]_C_int 64 n := uintptr(CTL_MAXNAME) * siz 65 66 p := (*byte)(unsafe.Pointer(&buf[0])) 67 bytes, err := ByteSliceFromString(name) 68 if err != nil { 69 return nil, err 70 } 71 72 // Magic sysctl: "setting" 0.3 to a string name 73 // lets you read back the array of integers form. 74 if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { 75 return nil, err 76 } 77 return buf[0 : n/siz], nil 78} 79 80//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 81func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 82func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 83 84const ( 85 attrBitMapCount = 5 86 attrCmnFullpath = 0x08000000 87) 88 89type attrList struct { 90 bitmapCount uint16 91 _ uint16 92 CommonAttr uint32 93 VolAttr uint32 94 DirAttr uint32 95 FileAttr uint32 96 Forkattr uint32 97} 98 99func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { 100 if len(attrBuf) < 4 { 101 return nil, errors.New("attrBuf too small") 102 } 103 attrList.bitmapCount = attrBitMapCount 104 105 var _p0 *byte 106 _p0, err = BytePtrFromString(path) 107 if err != nil { 108 return nil, err 109 } 110 111 _, _, e1 := Syscall6( 112 SYS_GETATTRLIST, 113 uintptr(unsafe.Pointer(_p0)), 114 uintptr(unsafe.Pointer(&attrList)), 115 uintptr(unsafe.Pointer(&attrBuf[0])), 116 uintptr(len(attrBuf)), 117 uintptr(options), 118 0, 119 ) 120 if e1 != 0 { 121 return nil, e1 122 } 123 size := *(*uint32)(unsafe.Pointer(&attrBuf[0])) 124 125 // dat is the section of attrBuf that contains valid data, 126 // without the 4 byte length header. All attribute offsets 127 // are relative to dat. 128 dat := attrBuf 129 if int(size) < len(attrBuf) { 130 dat = dat[:size] 131 } 132 dat = dat[4:] // remove length prefix 133 134 for i := uint32(0); int(i) < len(dat); { 135 header := dat[i:] 136 if len(header) < 8 { 137 return attrs, errors.New("truncated attribute header") 138 } 139 datOff := *(*int32)(unsafe.Pointer(&header[0])) 140 attrLen := *(*uint32)(unsafe.Pointer(&header[4])) 141 if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) { 142 return attrs, errors.New("truncated results; attrBuf too small") 143 } 144 end := uint32(datOff) + attrLen 145 attrs = append(attrs, dat[datOff:end]) 146 i = end 147 if r := i % 4; r != 0 { 148 i += (4 - r) 149 } 150 } 151 return 152} 153 154//sysnb pipe() (r int, w int, err error) 155 156func Pipe(p []int) (err error) { 157 if len(p) != 2 { 158 return EINVAL 159 } 160 p[0], p[1], err = pipe() 161 return 162} 163 164func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 165 var _p0 unsafe.Pointer 166 var bufsize uintptr 167 if len(buf) > 0 { 168 _p0 = unsafe.Pointer(&buf[0]) 169 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 170 } 171 r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), bufsize, uintptr(flags)) 172 n = int(r0) 173 if e1 != 0 { 174 err = e1 175 } 176 return 177} 178 179func xattrPointer(dest []byte) *byte { 180 // It's only when dest is set to NULL that the OS X implementations of 181 // getxattr() and listxattr() return the current sizes of the named attributes. 182 // An empty byte array is not sufficient. To maintain the same behaviour as the 183 // linux implementation, we wrap around the system calls and pass in NULL when 184 // dest is empty. 185 var destp *byte 186 if len(dest) > 0 { 187 destp = &dest[0] 188 } 189 return destp 190} 191 192//sys getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) 193 194func Getxattr(path string, attr string, dest []byte) (sz int, err error) { 195 return getxattr(path, attr, xattrPointer(dest), len(dest), 0, 0) 196} 197 198func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) { 199 return getxattr(link, attr, xattrPointer(dest), len(dest), 0, XATTR_NOFOLLOW) 200} 201 202//sys setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) 203 204func Setxattr(path string, attr string, data []byte, flags int) (err error) { 205 // The parameters for the OS X implementation vary slightly compared to the 206 // linux system call, specifically the position parameter: 207 // 208 // linux: 209 // int setxattr( 210 // const char *path, 211 // const char *name, 212 // const void *value, 213 // size_t size, 214 // int flags 215 // ); 216 // 217 // darwin: 218 // int setxattr( 219 // const char *path, 220 // const char *name, 221 // void *value, 222 // size_t size, 223 // u_int32_t position, 224 // int options 225 // ); 226 // 227 // position specifies the offset within the extended attribute. In the 228 // current implementation, only the resource fork extended attribute makes 229 // use of this argument. For all others, position is reserved. We simply 230 // default to setting it to zero. 231 return setxattr(path, attr, xattrPointer(data), len(data), 0, flags) 232} 233 234func Lsetxattr(link string, attr string, data []byte, flags int) (err error) { 235 return setxattr(link, attr, xattrPointer(data), len(data), 0, flags|XATTR_NOFOLLOW) 236} 237 238//sys removexattr(path string, attr string, options int) (err error) 239 240func Removexattr(path string, attr string) (err error) { 241 // We wrap around and explicitly zero out the options provided to the OS X 242 // implementation of removexattr, we do so for interoperability with the 243 // linux variant. 244 return removexattr(path, attr, 0) 245} 246 247func Lremovexattr(link string, attr string) (err error) { 248 return removexattr(link, attr, XATTR_NOFOLLOW) 249} 250 251//sys listxattr(path string, dest *byte, size int, options int) (sz int, err error) 252 253func Listxattr(path string, dest []byte) (sz int, err error) { 254 return listxattr(path, xattrPointer(dest), len(dest), 0) 255} 256 257func Llistxattr(link string, dest []byte) (sz int, err error) { 258 return listxattr(link, xattrPointer(dest), len(dest), XATTR_NOFOLLOW) 259} 260 261func setattrlistTimes(path string, times []Timespec, flags int) error { 262 _p0, err := BytePtrFromString(path) 263 if err != nil { 264 return err 265 } 266 267 var attrList attrList 268 attrList.bitmapCount = ATTR_BIT_MAP_COUNT 269 attrList.CommonAttr = ATTR_CMN_MODTIME | ATTR_CMN_ACCTIME 270 271 // order is mtime, atime: the opposite of Chtimes 272 attributes := [2]Timespec{times[1], times[0]} 273 options := 0 274 if flags&AT_SYMLINK_NOFOLLOW != 0 { 275 options |= FSOPT_NOFOLLOW 276 } 277 _, _, e1 := Syscall6( 278 SYS_SETATTRLIST, 279 uintptr(unsafe.Pointer(_p0)), 280 uintptr(unsafe.Pointer(&attrList)), 281 uintptr(unsafe.Pointer(&attributes)), 282 uintptr(unsafe.Sizeof(attributes)), 283 uintptr(options), 284 0, 285 ) 286 if e1 != 0 { 287 return e1 288 } 289 return nil 290} 291 292func utimensat(dirfd int, path string, times *[2]Timespec, flags int) error { 293 // Darwin doesn't support SYS_UTIMENSAT 294 return ENOSYS 295} 296 297/* 298 * Wrapped 299 */ 300 301//sys kill(pid int, signum int, posix int) (err error) 302 303func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) } 304 305//sys ioctl(fd int, req uint, arg uintptr) (err error) 306 307// ioctl itself should not be exposed directly, but additional get/set 308// functions for specific types are permissible. 309 310// IoctlSetInt performs an ioctl operation which sets an integer value 311// on fd, using the specified request number. 312func IoctlSetInt(fd int, req uint, value int) error { 313 return ioctl(fd, req, uintptr(value)) 314} 315 316func ioctlSetWinsize(fd int, req uint, value *Winsize) error { 317 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 318} 319 320func ioctlSetTermios(fd int, req uint, value *Termios) error { 321 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 322} 323 324// IoctlGetInt performs an ioctl operation which gets an integer value 325// from fd, using the specified request number. 326func IoctlGetInt(fd int, req uint) (int, error) { 327 var value int 328 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 329 return value, err 330} 331 332func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 333 var value Winsize 334 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 335 return &value, err 336} 337 338func IoctlGetTermios(fd int, req uint) (*Termios, error) { 339 var value Termios 340 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 341 return &value, err 342} 343 344func Uname(uname *Utsname) error { 345 mib := []_C_int{CTL_KERN, KERN_OSTYPE} 346 n := unsafe.Sizeof(uname.Sysname) 347 if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil { 348 return err 349 } 350 351 mib = []_C_int{CTL_KERN, KERN_HOSTNAME} 352 n = unsafe.Sizeof(uname.Nodename) 353 if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil { 354 return err 355 } 356 357 mib = []_C_int{CTL_KERN, KERN_OSRELEASE} 358 n = unsafe.Sizeof(uname.Release) 359 if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil { 360 return err 361 } 362 363 mib = []_C_int{CTL_KERN, KERN_VERSION} 364 n = unsafe.Sizeof(uname.Version) 365 if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil { 366 return err 367 } 368 369 // The version might have newlines or tabs in it, convert them to 370 // spaces. 371 for i, b := range uname.Version { 372 if b == '\n' || b == '\t' { 373 if i == len(uname.Version)-1 { 374 uname.Version[i] = 0 375 } else { 376 uname.Version[i] = ' ' 377 } 378 } 379 } 380 381 mib = []_C_int{CTL_HW, HW_MACHINE} 382 n = unsafe.Sizeof(uname.Machine) 383 if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil { 384 return err 385 } 386 387 return nil 388} 389 390/* 391 * Exposed directly 392 */ 393//sys Access(path string, mode uint32) (err error) 394//sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 395//sys Chdir(path string) (err error) 396//sys Chflags(path string, flags int) (err error) 397//sys Chmod(path string, mode uint32) (err error) 398//sys Chown(path string, uid int, gid int) (err error) 399//sys Chroot(path string) (err error) 400//sys Close(fd int) (err error) 401//sys Dup(fd int) (nfd int, err error) 402//sys Dup2(from int, to int) (err error) 403//sys Exchangedata(path1 string, path2 string, options int) (err error) 404//sys Exit(code int) 405//sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 406//sys Fchdir(fd int) (err error) 407//sys Fchflags(fd int, flags int) (err error) 408//sys Fchmod(fd int, mode uint32) (err error) 409//sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) 410//sys Fchown(fd int, uid int, gid int) (err error) 411//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 412//sys Flock(fd int, how int) (err error) 413//sys Fpathconf(fd int, name int) (val int, err error) 414//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 415//sys Fstatat(fd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 416//sys Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64 417//sys Fsync(fd int) (err error) 418//sys Ftruncate(fd int, length int64) (err error) 419//sys Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64 420//sys Getdtablesize() (size int) 421//sysnb Getegid() (egid int) 422//sysnb Geteuid() (uid int) 423//sysnb Getgid() (gid int) 424//sysnb Getpgid(pid int) (pgid int, err error) 425//sysnb Getpgrp() (pgrp int) 426//sysnb Getpid() (pid int) 427//sysnb Getppid() (ppid int) 428//sys Getpriority(which int, who int) (prio int, err error) 429//sysnb Getrlimit(which int, lim *Rlimit) (err error) 430//sysnb Getrusage(who int, rusage *Rusage) (err error) 431//sysnb Getsid(pid int) (sid int, err error) 432//sysnb Getuid() (uid int) 433//sysnb Issetugid() (tainted bool) 434//sys Kqueue() (fd int, err error) 435//sys Lchown(path string, uid int, gid int) (err error) 436//sys Link(path string, link string) (err error) 437//sys Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) 438//sys Listen(s int, backlog int) (err error) 439//sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 440//sys Mkdir(path string, mode uint32) (err error) 441//sys Mkdirat(dirfd int, path string, mode uint32) (err error) 442//sys Mkfifo(path string, mode uint32) (err error) 443//sys Mknod(path string, mode uint32, dev int) (err error) 444//sys Open(path string, mode int, perm uint32) (fd int, err error) 445//sys Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) 446//sys Pathconf(path string, name int) (val int, err error) 447//sys Pread(fd int, p []byte, offset int64) (n int, err error) 448//sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 449//sys read(fd int, p []byte) (n int, err error) 450//sys Readlink(path string, buf []byte) (n int, err error) 451//sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 452//sys Rename(from string, to string) (err error) 453//sys Renameat(fromfd int, from string, tofd int, to string) (err error) 454//sys Revoke(path string) (err error) 455//sys Rmdir(path string) (err error) 456//sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 457//sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 458//sys Setegid(egid int) (err error) 459//sysnb Seteuid(euid int) (err error) 460//sysnb Setgid(gid int) (err error) 461//sys Setlogin(name string) (err error) 462//sysnb Setpgid(pid int, pgid int) (err error) 463//sys Setpriority(which int, who int, prio int) (err error) 464//sys Setprivexec(flag int) (err error) 465//sysnb Setregid(rgid int, egid int) (err error) 466//sysnb Setreuid(ruid int, euid int) (err error) 467//sysnb Setrlimit(which int, lim *Rlimit) (err error) 468//sysnb Setsid() (pid int, err error) 469//sysnb Settimeofday(tp *Timeval) (err error) 470//sysnb Setuid(uid int) (err error) 471//sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 472//sys Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64 473//sys Symlink(path string, link string) (err error) 474//sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 475//sys Sync() (err error) 476//sys Truncate(path string, length int64) (err error) 477//sys Umask(newmask int) (oldmask int) 478//sys Undelete(path string) (err error) 479//sys Unlink(path string) (err error) 480//sys Unlinkat(dirfd int, path string, flags int) (err error) 481//sys Unmount(path string, flags int) (err error) 482//sys write(fd int, p []byte) (n int, err error) 483//sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 484//sys munmap(addr uintptr, length uintptr) (err error) 485//sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 486//sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 487 488/* 489 * Unimplemented 490 */ 491// Profil 492// Sigaction 493// Sigprocmask 494// Getlogin 495// Sigpending 496// Sigaltstack 497// Ioctl 498// Reboot 499// Execve 500// Vfork 501// Sbrk 502// Sstk 503// Ovadvise 504// Mincore 505// Setitimer 506// Swapon 507// Select 508// Sigsuspend 509// Readv 510// Writev 511// Nfssvc 512// Getfh 513// Quotactl 514// Mount 515// Csops 516// Waitid 517// Add_profil 518// Kdebug_trace 519// Sigreturn 520// Atsocket 521// Kqueue_from_portset_np 522// Kqueue_portset 523// Getattrlist 524// Setattrlist 525// Getdirentriesattr 526// Searchfs 527// Delete 528// Copyfile 529// Watchevent 530// Waitevent 531// Modwatch 532// Fgetxattr 533// Fsetxattr 534// Fremovexattr 535// Flistxattr 536// Fsctl 537// Initgroups 538// Posix_spawn 539// Nfsclnt 540// Fhopen 541// Minherit 542// Semsys 543// Msgsys 544// Shmsys 545// Semctl 546// Semget 547// Semop 548// Msgctl 549// Msgget 550// Msgsnd 551// Msgrcv 552// Shmat 553// Shmctl 554// Shmdt 555// Shmget 556// Shm_open 557// Shm_unlink 558// Sem_open 559// Sem_close 560// Sem_unlink 561// Sem_wait 562// Sem_trywait 563// Sem_post 564// Sem_getvalue 565// Sem_init 566// Sem_destroy 567// Open_extended 568// Umask_extended 569// Stat_extended 570// Lstat_extended 571// Fstat_extended 572// Chmod_extended 573// Fchmod_extended 574// Access_extended 575// Settid 576// Gettid 577// Setsgroups 578// Getsgroups 579// Setwgroups 580// Getwgroups 581// Mkfifo_extended 582// Mkdir_extended 583// Identitysvc 584// Shared_region_check_np 585// Shared_region_map_np 586// __pthread_mutex_destroy 587// __pthread_mutex_init 588// __pthread_mutex_lock 589// __pthread_mutex_trylock 590// __pthread_mutex_unlock 591// __pthread_cond_init 592// __pthread_cond_destroy 593// __pthread_cond_broadcast 594// __pthread_cond_signal 595// Setsid_with_pid 596// __pthread_cond_timedwait 597// Aio_fsync 598// Aio_return 599// Aio_suspend 600// Aio_cancel 601// Aio_error 602// Aio_read 603// Aio_write 604// Lio_listio 605// __pthread_cond_wait 606// Iopolicysys 607// __pthread_kill 608// __pthread_sigmask 609// __sigwait 610// __disable_threadsignal 611// __pthread_markcancel 612// __pthread_canceled 613// __semwait_signal 614// Proc_info 615// sendfile 616// Stat64_extended 617// Lstat64_extended 618// Fstat64_extended 619// __pthread_chdir 620// __pthread_fchdir 621// Audit 622// Auditon 623// Getauid 624// Setauid 625// Getaudit 626// Setaudit 627// Getaudit_addr 628// Setaudit_addr 629// Auditctl 630// Bsdthread_create 631// Bsdthread_terminate 632// Stack_snapshot 633// Bsdthread_register 634// Workq_open 635// Workq_ops 636// __mac_execve 637// __mac_syscall 638// __mac_get_file 639// __mac_set_file 640// __mac_get_link 641// __mac_set_link 642// __mac_get_proc 643// __mac_set_proc 644// __mac_get_fd 645// __mac_set_fd 646// __mac_get_pid 647// __mac_get_lcid 648// __mac_get_lctx 649// __mac_set_lctx 650// Setlcid 651// Read_nocancel 652// Write_nocancel 653// Open_nocancel 654// Close_nocancel 655// Wait4_nocancel 656// Recvmsg_nocancel 657// Sendmsg_nocancel 658// Recvfrom_nocancel 659// Accept_nocancel 660// Fcntl_nocancel 661// Select_nocancel 662// Fsync_nocancel 663// Connect_nocancel 664// Sigsuspend_nocancel 665// Readv_nocancel 666// Writev_nocancel 667// Sendto_nocancel 668// Pread_nocancel 669// Pwrite_nocancel 670// Waitid_nocancel 671// Poll_nocancel 672// Msgsnd_nocancel 673// Msgrcv_nocancel 674// Sem_wait_nocancel 675// Aio_suspend_nocancel 676// __sigwait_nocancel 677// __semwait_signal_nocancel 678// __mac_mount 679// __mac_get_mount 680// __mac_getfsstat 681