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 80func direntIno(buf []byte) (uint64, bool) { 81 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 82} 83 84func direntReclen(buf []byte) (uint64, bool) { 85 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 86} 87 88func direntNamlen(buf []byte) (uint64, bool) { 89 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) 90} 91 92func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 93func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 94 95const ( 96 attrBitMapCount = 5 97 attrCmnFullpath = 0x08000000 98) 99 100type attrList struct { 101 bitmapCount uint16 102 _ uint16 103 CommonAttr uint32 104 VolAttr uint32 105 DirAttr uint32 106 FileAttr uint32 107 Forkattr uint32 108} 109 110func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) { 111 if len(attrBuf) < 4 { 112 return nil, errors.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 if err := getattrlist(_p0, unsafe.Pointer(&attrList), unsafe.Pointer(&attrBuf[0]), uintptr(len(attrBuf)), int(options)); err != nil { 123 return nil, err 124 } 125 size := *(*uint32)(unsafe.Pointer(&attrBuf[0])) 126 127 // dat is the section of attrBuf that contains valid data, 128 // without the 4 byte length header. All attribute offsets 129 // are relative to dat. 130 dat := attrBuf 131 if int(size) < len(attrBuf) { 132 dat = dat[:size] 133 } 134 dat = dat[4:] // remove length prefix 135 136 for i := uint32(0); int(i) < len(dat); { 137 header := dat[i:] 138 if len(header) < 8 { 139 return attrs, errors.New("truncated attribute header") 140 } 141 datOff := *(*int32)(unsafe.Pointer(&header[0])) 142 attrLen := *(*uint32)(unsafe.Pointer(&header[4])) 143 if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) { 144 return attrs, errors.New("truncated results; attrBuf too small") 145 } 146 end := uint32(datOff) + attrLen 147 attrs = append(attrs, dat[datOff:end]) 148 i = end 149 if r := i % 4; r != 0 { 150 i += (4 - r) 151 } 152 } 153 return 154} 155 156//sys getattrlist(path *byte, list unsafe.Pointer, buf unsafe.Pointer, size uintptr, options int) (err error) 157 158//sysnb pipe() (r int, w int, err error) 159 160func Pipe(p []int) (err error) { 161 if len(p) != 2 { 162 return EINVAL 163 } 164 p[0], p[1], err = pipe() 165 return 166} 167 168func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 169 var _p0 unsafe.Pointer 170 var bufsize uintptr 171 if len(buf) > 0 { 172 _p0 = unsafe.Pointer(&buf[0]) 173 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 174 } 175 return getfsstat(_p0, bufsize, flags) 176} 177 178func xattrPointer(dest []byte) *byte { 179 // It's only when dest is set to NULL that the OS X implementations of 180 // getxattr() and listxattr() return the current sizes of the named attributes. 181 // An empty byte array is not sufficient. To maintain the same behaviour as the 182 // linux implementation, we wrap around the system calls and pass in NULL when 183 // dest is empty. 184 var destp *byte 185 if len(dest) > 0 { 186 destp = &dest[0] 187 } 188 return destp 189} 190 191//sys getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) 192 193func Getxattr(path string, attr string, dest []byte) (sz int, err error) { 194 return getxattr(path, attr, xattrPointer(dest), len(dest), 0, 0) 195} 196 197func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) { 198 return getxattr(link, attr, xattrPointer(dest), len(dest), 0, XATTR_NOFOLLOW) 199} 200 201//sys fgetxattr(fd int, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) 202 203func Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) { 204 return fgetxattr(fd, attr, xattrPointer(dest), len(dest), 0, 0) 205} 206 207//sys setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) 208 209func Setxattr(path string, attr string, data []byte, flags int) (err error) { 210 // The parameters for the OS X implementation vary slightly compared to the 211 // linux system call, specifically the position parameter: 212 // 213 // linux: 214 // int setxattr( 215 // const char *path, 216 // const char *name, 217 // const void *value, 218 // size_t size, 219 // int flags 220 // ); 221 // 222 // darwin: 223 // int setxattr( 224 // const char *path, 225 // const char *name, 226 // void *value, 227 // size_t size, 228 // u_int32_t position, 229 // int options 230 // ); 231 // 232 // position specifies the offset within the extended attribute. In the 233 // current implementation, only the resource fork extended attribute makes 234 // use of this argument. For all others, position is reserved. We simply 235 // default to setting it to zero. 236 return setxattr(path, attr, xattrPointer(data), len(data), 0, flags) 237} 238 239func Lsetxattr(link string, attr string, data []byte, flags int) (err error) { 240 return setxattr(link, attr, xattrPointer(data), len(data), 0, flags|XATTR_NOFOLLOW) 241} 242 243//sys fsetxattr(fd int, attr string, data *byte, size int, position uint32, options int) (err error) 244 245func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) { 246 return fsetxattr(fd, attr, xattrPointer(data), len(data), 0, 0) 247} 248 249//sys removexattr(path string, attr string, options int) (err error) 250 251func Removexattr(path string, attr string) (err error) { 252 // We wrap around and explicitly zero out the options provided to the OS X 253 // implementation of removexattr, we do so for interoperability with the 254 // linux variant. 255 return removexattr(path, attr, 0) 256} 257 258func Lremovexattr(link string, attr string) (err error) { 259 return removexattr(link, attr, XATTR_NOFOLLOW) 260} 261 262//sys fremovexattr(fd int, attr string, options int) (err error) 263 264func Fremovexattr(fd int, attr string) (err error) { 265 return fremovexattr(fd, attr, 0) 266} 267 268//sys listxattr(path string, dest *byte, size int, options int) (sz int, err error) 269 270func Listxattr(path string, dest []byte) (sz int, err error) { 271 return listxattr(path, xattrPointer(dest), len(dest), 0) 272} 273 274func Llistxattr(link string, dest []byte) (sz int, err error) { 275 return listxattr(link, xattrPointer(dest), len(dest), XATTR_NOFOLLOW) 276} 277 278//sys flistxattr(fd int, dest *byte, size int, options int) (sz int, err error) 279 280func Flistxattr(fd int, dest []byte) (sz int, err error) { 281 return flistxattr(fd, xattrPointer(dest), len(dest), 0) 282} 283 284func setattrlistTimes(path string, times []Timespec, flags int) error { 285 _p0, err := BytePtrFromString(path) 286 if err != nil { 287 return err 288 } 289 290 var attrList attrList 291 attrList.bitmapCount = ATTR_BIT_MAP_COUNT 292 attrList.CommonAttr = ATTR_CMN_MODTIME | ATTR_CMN_ACCTIME 293 294 // order is mtime, atime: the opposite of Chtimes 295 attributes := [2]Timespec{times[1], times[0]} 296 options := 0 297 if flags&AT_SYMLINK_NOFOLLOW != 0 { 298 options |= FSOPT_NOFOLLOW 299 } 300 return setattrlist( 301 _p0, 302 unsafe.Pointer(&attrList), 303 unsafe.Pointer(&attributes), 304 unsafe.Sizeof(attributes), 305 options) 306} 307 308//sys setattrlist(path *byte, list unsafe.Pointer, buf unsafe.Pointer, size uintptr, options int) (err error) 309 310func utimensat(dirfd int, path string, times *[2]Timespec, flags int) error { 311 // Darwin doesn't support SYS_UTIMENSAT 312 return ENOSYS 313} 314 315/* 316 * Wrapped 317 */ 318 319//sys fcntl(fd int, cmd int, arg int) (val int, err error) 320 321//sys kill(pid int, signum int, posix int) (err error) 322 323func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) } 324 325//sys ioctl(fd int, req uint, arg uintptr) (err error) 326 327//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS_SYSCTL 328 329func Uname(uname *Utsname) error { 330 mib := []_C_int{CTL_KERN, KERN_OSTYPE} 331 n := unsafe.Sizeof(uname.Sysname) 332 if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil { 333 return err 334 } 335 336 mib = []_C_int{CTL_KERN, KERN_HOSTNAME} 337 n = unsafe.Sizeof(uname.Nodename) 338 if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil { 339 return err 340 } 341 342 mib = []_C_int{CTL_KERN, KERN_OSRELEASE} 343 n = unsafe.Sizeof(uname.Release) 344 if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil { 345 return err 346 } 347 348 mib = []_C_int{CTL_KERN, KERN_VERSION} 349 n = unsafe.Sizeof(uname.Version) 350 if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil { 351 return err 352 } 353 354 // The version might have newlines or tabs in it, convert them to 355 // spaces. 356 for i, b := range uname.Version { 357 if b == '\n' || b == '\t' { 358 if i == len(uname.Version)-1 { 359 uname.Version[i] = 0 360 } else { 361 uname.Version[i] = ' ' 362 } 363 } 364 } 365 366 mib = []_C_int{CTL_HW, HW_MACHINE} 367 n = unsafe.Sizeof(uname.Machine) 368 if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil { 369 return err 370 } 371 372 return nil 373} 374 375func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) { 376 if raceenabled { 377 raceReleaseMerge(unsafe.Pointer(&ioSync)) 378 } 379 var length = int64(count) 380 err = sendfile(infd, outfd, *offset, &length, nil, 0) 381 written = int(length) 382 return 383} 384 385//sys sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error) 386 387/* 388 * Exposed directly 389 */ 390//sys Access(path string, mode uint32) (err error) 391//sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 392//sys Chdir(path string) (err error) 393//sys Chflags(path string, flags int) (err error) 394//sys Chmod(path string, mode uint32) (err error) 395//sys Chown(path string, uid int, gid int) (err error) 396//sys Chroot(path string) (err error) 397//sys ClockGettime(clockid int32, time *Timespec) (err error) 398//sys Close(fd int) (err error) 399//sys Dup(fd int) (nfd int, err error) 400//sys Dup2(from int, to int) (err error) 401//sys Exchangedata(path1 string, path2 string, options int) (err error) 402//sys Exit(code int) 403//sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 404//sys Fchdir(fd int) (err error) 405//sys Fchflags(fd int, flags int) (err error) 406//sys Fchmod(fd int, mode uint32) (err error) 407//sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) 408//sys Fchown(fd int, uid int, gid int) (err error) 409//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 410//sys Flock(fd int, how int) (err error) 411//sys Fpathconf(fd int, name int) (val int, err error) 412//sys Fsync(fd int) (err error) 413//sys Ftruncate(fd int, length int64) (err error) 414//sys Getdtablesize() (size int) 415//sysnb Getegid() (egid int) 416//sysnb Geteuid() (uid int) 417//sysnb Getgid() (gid int) 418//sysnb Getpgid(pid int) (pgid int, err error) 419//sysnb Getpgrp() (pgrp int) 420//sysnb Getpid() (pid int) 421//sysnb Getppid() (ppid int) 422//sys Getpriority(which int, who int) (prio int, err error) 423//sysnb Getrlimit(which int, lim *Rlimit) (err error) 424//sysnb Getrusage(who int, rusage *Rusage) (err error) 425//sysnb Getsid(pid int) (sid int, err error) 426//sysnb Getuid() (uid int) 427//sysnb Issetugid() (tainted bool) 428//sys Kqueue() (fd int, err error) 429//sys Lchown(path string, uid int, gid int) (err error) 430//sys Link(path string, link string) (err error) 431//sys Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) 432//sys Listen(s int, backlog int) (err error) 433//sys Mkdir(path string, mode uint32) (err error) 434//sys Mkdirat(dirfd int, path string, mode uint32) (err error) 435//sys Mkfifo(path string, mode uint32) (err error) 436//sys Mknod(path string, mode uint32, dev int) (err error) 437//sys Open(path string, mode int, perm uint32) (fd int, err error) 438//sys Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) 439//sys Pathconf(path string, name int) (val int, err error) 440//sys Pread(fd int, p []byte, offset int64) (n int, err error) 441//sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 442//sys read(fd int, p []byte) (n int, err error) 443//sys Readlink(path string, buf []byte) (n int, err error) 444//sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 445//sys Rename(from string, to string) (err error) 446//sys Renameat(fromfd int, from string, tofd int, to string) (err error) 447//sys Revoke(path string) (err error) 448//sys Rmdir(path string) (err error) 449//sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 450//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) 451//sys Setegid(egid int) (err error) 452//sysnb Seteuid(euid int) (err error) 453//sysnb Setgid(gid int) (err error) 454//sys Setlogin(name string) (err error) 455//sysnb Setpgid(pid int, pgid int) (err error) 456//sys Setpriority(which int, who int, prio int) (err error) 457//sys Setprivexec(flag int) (err error) 458//sysnb Setregid(rgid int, egid int) (err error) 459//sysnb Setreuid(ruid int, euid int) (err error) 460//sysnb Setrlimit(which int, lim *Rlimit) (err error) 461//sysnb Setsid() (pid int, err error) 462//sysnb Settimeofday(tp *Timeval) (err error) 463//sysnb Setuid(uid int) (err error) 464//sys Symlink(path string, link string) (err error) 465//sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 466//sys Sync() (err error) 467//sys Truncate(path string, length int64) (err error) 468//sys Umask(newmask int) (oldmask int) 469//sys Undelete(path string) (err error) 470//sys Unlink(path string) (err error) 471//sys Unlinkat(dirfd int, path string, flags int) (err error) 472//sys Unmount(path string, flags int) (err error) 473//sys write(fd int, p []byte) (n int, err error) 474//sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 475//sys munmap(addr uintptr, length uintptr) (err error) 476//sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 477//sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 478 479/* 480 * Unimplemented 481 */ 482// Profil 483// Sigaction 484// Sigprocmask 485// Getlogin 486// Sigpending 487// Sigaltstack 488// Ioctl 489// Reboot 490// Execve 491// Vfork 492// Sbrk 493// Sstk 494// Ovadvise 495// Mincore 496// Setitimer 497// Swapon 498// Select 499// Sigsuspend 500// Readv 501// Writev 502// Nfssvc 503// Getfh 504// Quotactl 505// Mount 506// Csops 507// Waitid 508// Add_profil 509// Kdebug_trace 510// Sigreturn 511// Atsocket 512// Kqueue_from_portset_np 513// Kqueue_portset 514// Getattrlist 515// Setattrlist 516// Getdirentriesattr 517// Searchfs 518// Delete 519// Copyfile 520// Watchevent 521// Waitevent 522// Modwatch 523// Fsctl 524// Initgroups 525// Posix_spawn 526// Nfsclnt 527// Fhopen 528// Minherit 529// Semsys 530// Msgsys 531// Shmsys 532// Semctl 533// Semget 534// Semop 535// Msgctl 536// Msgget 537// Msgsnd 538// Msgrcv 539// Shmat 540// Shmctl 541// Shmdt 542// Shmget 543// Shm_open 544// Shm_unlink 545// Sem_open 546// Sem_close 547// Sem_unlink 548// Sem_wait 549// Sem_trywait 550// Sem_post 551// Sem_getvalue 552// Sem_init 553// Sem_destroy 554// Open_extended 555// Umask_extended 556// Stat_extended 557// Lstat_extended 558// Fstat_extended 559// Chmod_extended 560// Fchmod_extended 561// Access_extended 562// Settid 563// Gettid 564// Setsgroups 565// Getsgroups 566// Setwgroups 567// Getwgroups 568// Mkfifo_extended 569// Mkdir_extended 570// Identitysvc 571// Shared_region_check_np 572// Shared_region_map_np 573// __pthread_mutex_destroy 574// __pthread_mutex_init 575// __pthread_mutex_lock 576// __pthread_mutex_trylock 577// __pthread_mutex_unlock 578// __pthread_cond_init 579// __pthread_cond_destroy 580// __pthread_cond_broadcast 581// __pthread_cond_signal 582// Setsid_with_pid 583// __pthread_cond_timedwait 584// Aio_fsync 585// Aio_return 586// Aio_suspend 587// Aio_cancel 588// Aio_error 589// Aio_read 590// Aio_write 591// Lio_listio 592// __pthread_cond_wait 593// Iopolicysys 594// __pthread_kill 595// __pthread_sigmask 596// __sigwait 597// __disable_threadsignal 598// __pthread_markcancel 599// __pthread_canceled 600// __semwait_signal 601// Proc_info 602// sendfile 603// Stat64_extended 604// Lstat64_extended 605// Fstat64_extended 606// __pthread_chdir 607// __pthread_fchdir 608// Audit 609// Auditon 610// Getauid 611// Setauid 612// Getaudit 613// Setaudit 614// Getaudit_addr 615// Setaudit_addr 616// Auditctl 617// Bsdthread_create 618// Bsdthread_terminate 619// Stack_snapshot 620// Bsdthread_register 621// Workq_open 622// Workq_ops 623// __mac_execve 624// __mac_syscall 625// __mac_get_file 626// __mac_set_file 627// __mac_get_link 628// __mac_set_link 629// __mac_get_proc 630// __mac_set_proc 631// __mac_get_fd 632// __mac_set_fd 633// __mac_get_pid 634// __mac_get_lcid 635// __mac_get_lctx 636// __mac_set_lctx 637// Setlcid 638// Read_nocancel 639// Write_nocancel 640// Open_nocancel 641// Close_nocancel 642// Wait4_nocancel 643// Recvmsg_nocancel 644// Sendmsg_nocancel 645// Recvfrom_nocancel 646// Accept_nocancel 647// Fcntl_nocancel 648// Select_nocancel 649// Fsync_nocancel 650// Connect_nocancel 651// Sigsuspend_nocancel 652// Readv_nocancel 653// Writev_nocancel 654// Sendto_nocancel 655// Pread_nocancel 656// Pwrite_nocancel 657// Waitid_nocancel 658// Poll_nocancel 659// Msgsnd_nocancel 660// Msgrcv_nocancel 661// Sem_wait_nocancel 662// Aio_suspend_nocancel 663// __sigwait_nocancel 664// __semwait_signal_nocancel 665// __mac_mount 666// __mac_get_mount 667// __mac_getfsstat 668