github.com/alexis81/domosgo@v0.0.0-20191016125037-5aee90a434af/Domos/src/golang.org/x/sys/unix/syscall_linux.go (about) 1 // Copyright 2009 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 // Linux 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 10 // wrap it in our own nicer implementation. 11 12 package unix 13 14 import ( 15 "syscall" 16 "unsafe" 17 ) 18 19 /* 20 * Wrapped 21 */ 22 23 func Access(path string, mode uint32) (err error) { 24 return Faccessat(AT_FDCWD, path, mode, 0) 25 } 26 27 func Chmod(path string, mode uint32) (err error) { 28 return Fchmodat(AT_FDCWD, path, mode, 0) 29 } 30 31 func Chown(path string, uid int, gid int) (err error) { 32 return Fchownat(AT_FDCWD, path, uid, gid, 0) 33 } 34 35 func Creat(path string, mode uint32) (fd int, err error) { 36 return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode) 37 } 38 39 //sys fchmodat(dirfd int, path string, mode uint32) (err error) 40 41 func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) { 42 // Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior 43 // and check the flags. Otherwise the mode would be applied to the symlink 44 // destination which is not what the user expects. 45 if flags&^AT_SYMLINK_NOFOLLOW != 0 { 46 return EINVAL 47 } else if flags&AT_SYMLINK_NOFOLLOW != 0 { 48 return EOPNOTSUPP 49 } 50 return fchmodat(dirfd, path, mode) 51 } 52 53 //sys ioctl(fd int, req uint, arg uintptr) (err error) 54 55 // ioctl itself should not be exposed directly, but additional get/set 56 // functions for specific types are permissible. 57 58 // IoctlSetInt performs an ioctl operation which sets an integer value 59 // on fd, using the specified request number. 60 func IoctlSetInt(fd int, req uint, value int) error { 61 return ioctl(fd, req, uintptr(value)) 62 } 63 64 func IoctlSetWinsize(fd int, req uint, value *Winsize) error { 65 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 66 } 67 68 func IoctlSetTermios(fd int, req uint, value *Termios) error { 69 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 70 } 71 72 // IoctlGetInt performs an ioctl operation which gets an integer value 73 // from fd, using the specified request number. 74 func IoctlGetInt(fd int, req uint) (int, error) { 75 var value int 76 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 77 return value, err 78 } 79 80 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 81 var value Winsize 82 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 83 return &value, err 84 } 85 86 func IoctlGetTermios(fd int, req uint) (*Termios, error) { 87 var value Termios 88 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 89 return &value, err 90 } 91 92 //sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) 93 94 func Link(oldpath string, newpath string) (err error) { 95 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) 96 } 97 98 func Mkdir(path string, mode uint32) (err error) { 99 return Mkdirat(AT_FDCWD, path, mode) 100 } 101 102 func Mknod(path string, mode uint32, dev int) (err error) { 103 return Mknodat(AT_FDCWD, path, mode, dev) 104 } 105 106 func Open(path string, mode int, perm uint32) (fd int, err error) { 107 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm) 108 } 109 110 //sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) 111 112 func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) { 113 return openat(dirfd, path, flags|O_LARGEFILE, mode) 114 } 115 116 //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) 117 118 func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { 119 if len(fds) == 0 { 120 return ppoll(nil, 0, timeout, sigmask) 121 } 122 return ppoll(&fds[0], len(fds), timeout, sigmask) 123 } 124 125 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 126 127 func Readlink(path string, buf []byte) (n int, err error) { 128 return Readlinkat(AT_FDCWD, path, buf) 129 } 130 131 func Rename(oldpath string, newpath string) (err error) { 132 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) 133 } 134 135 func Rmdir(path string) error { 136 return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR) 137 } 138 139 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 140 141 func Symlink(oldpath string, newpath string) (err error) { 142 return Symlinkat(oldpath, AT_FDCWD, newpath) 143 } 144 145 func Unlink(path string) error { 146 return Unlinkat(AT_FDCWD, path, 0) 147 } 148 149 //sys Unlinkat(dirfd int, path string, flags int) (err error) 150 151 //sys utimes(path string, times *[2]Timeval) (err error) 152 153 func Utimes(path string, tv []Timeval) error { 154 if tv == nil { 155 err := utimensat(AT_FDCWD, path, nil, 0) 156 if err != ENOSYS { 157 return err 158 } 159 return utimes(path, nil) 160 } 161 if len(tv) != 2 { 162 return EINVAL 163 } 164 var ts [2]Timespec 165 ts[0] = NsecToTimespec(TimevalToNsec(tv[0])) 166 ts[1] = NsecToTimespec(TimevalToNsec(tv[1])) 167 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 168 if err != ENOSYS { 169 return err 170 } 171 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 172 } 173 174 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) 175 176 func UtimesNano(path string, ts []Timespec) error { 177 if ts == nil { 178 err := utimensat(AT_FDCWD, path, nil, 0) 179 if err != ENOSYS { 180 return err 181 } 182 return utimes(path, nil) 183 } 184 if len(ts) != 2 { 185 return EINVAL 186 } 187 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 188 if err != ENOSYS { 189 return err 190 } 191 // If the utimensat syscall isn't available (utimensat was added to Linux 192 // in 2.6.22, Released, 8 July 2007) then fall back to utimes 193 var tv [2]Timeval 194 for i := 0; i < 2; i++ { 195 tv[i] = NsecToTimeval(TimespecToNsec(ts[i])) 196 } 197 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 198 } 199 200 func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { 201 if ts == nil { 202 return utimensat(dirfd, path, nil, flags) 203 } 204 if len(ts) != 2 { 205 return EINVAL 206 } 207 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags) 208 } 209 210 //sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error) 211 212 func Futimesat(dirfd int, path string, tv []Timeval) error { 213 pathp, err := BytePtrFromString(path) 214 if err != nil { 215 return err 216 } 217 if tv == nil { 218 return futimesat(dirfd, pathp, nil) 219 } 220 if len(tv) != 2 { 221 return EINVAL 222 } 223 return futimesat(dirfd, pathp, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 224 } 225 226 func Futimes(fd int, tv []Timeval) (err error) { 227 // Believe it or not, this is the best we can do on Linux 228 // (and is what glibc does). 229 return Utimes("/proc/self/fd/"+itoa(fd), tv) 230 } 231 232 const ImplementsGetwd = true 233 234 //sys Getcwd(buf []byte) (n int, err error) 235 236 func Getwd() (wd string, err error) { 237 var buf [PathMax]byte 238 n, err := Getcwd(buf[0:]) 239 if err != nil { 240 return "", err 241 } 242 // Getcwd returns the number of bytes written to buf, including the NUL. 243 if n < 1 || n > len(buf) || buf[n-1] != 0 { 244 return "", EINVAL 245 } 246 return string(buf[0 : n-1]), nil 247 } 248 249 func Getgroups() (gids []int, err error) { 250 n, err := getgroups(0, nil) 251 if err != nil { 252 return nil, err 253 } 254 if n == 0 { 255 return nil, nil 256 } 257 258 // Sanity check group count. Max is 1<<16 on Linux. 259 if n < 0 || n > 1<<20 { 260 return nil, EINVAL 261 } 262 263 a := make([]_Gid_t, n) 264 n, err = getgroups(n, &a[0]) 265 if err != nil { 266 return nil, err 267 } 268 gids = make([]int, n) 269 for i, v := range a[0:n] { 270 gids[i] = int(v) 271 } 272 return 273 } 274 275 func Setgroups(gids []int) (err error) { 276 if len(gids) == 0 { 277 return setgroups(0, nil) 278 } 279 280 a := make([]_Gid_t, len(gids)) 281 for i, v := range gids { 282 a[i] = _Gid_t(v) 283 } 284 return setgroups(len(a), &a[0]) 285 } 286 287 type WaitStatus uint32 288 289 // Wait status is 7 bits at bottom, either 0 (exited), 290 // 0x7F (stopped), or a signal number that caused an exit. 291 // The 0x80 bit is whether there was a core dump. 292 // An extra number (exit code, signal causing a stop) 293 // is in the high bits. At least that's the idea. 294 // There are various irregularities. For example, the 295 // "continued" status is 0xFFFF, distinguishing itself 296 // from stopped via the core dump bit. 297 298 const ( 299 mask = 0x7F 300 core = 0x80 301 exited = 0x00 302 stopped = 0x7F 303 shift = 8 304 ) 305 306 func (w WaitStatus) Exited() bool { return w&mask == exited } 307 308 func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } 309 310 func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } 311 312 func (w WaitStatus) Continued() bool { return w == 0xFFFF } 313 314 func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } 315 316 func (w WaitStatus) ExitStatus() int { 317 if !w.Exited() { 318 return -1 319 } 320 return int(w>>shift) & 0xFF 321 } 322 323 func (w WaitStatus) Signal() syscall.Signal { 324 if !w.Signaled() { 325 return -1 326 } 327 return syscall.Signal(w & mask) 328 } 329 330 func (w WaitStatus) StopSignal() syscall.Signal { 331 if !w.Stopped() { 332 return -1 333 } 334 return syscall.Signal(w>>shift) & 0xFF 335 } 336 337 func (w WaitStatus) TrapCause() int { 338 if w.StopSignal() != SIGTRAP { 339 return -1 340 } 341 return int(w>>shift) >> 8 342 } 343 344 //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) 345 346 func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) { 347 var status _C_int 348 wpid, err = wait4(pid, &status, options, rusage) 349 if wstatus != nil { 350 *wstatus = WaitStatus(status) 351 } 352 return 353 } 354 355 func Mkfifo(path string, mode uint32) error { 356 return Mknod(path, mode|S_IFIFO, 0) 357 } 358 359 func Mkfifoat(dirfd int, path string, mode uint32) error { 360 return Mknodat(dirfd, path, mode|S_IFIFO, 0) 361 } 362 363 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) { 364 if sa.Port < 0 || sa.Port > 0xFFFF { 365 return nil, 0, EINVAL 366 } 367 sa.raw.Family = AF_INET 368 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 369 p[0] = byte(sa.Port >> 8) 370 p[1] = byte(sa.Port) 371 for i := 0; i < len(sa.Addr); i++ { 372 sa.raw.Addr[i] = sa.Addr[i] 373 } 374 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil 375 } 376 377 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) { 378 if sa.Port < 0 || sa.Port > 0xFFFF { 379 return nil, 0, EINVAL 380 } 381 sa.raw.Family = AF_INET6 382 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 383 p[0] = byte(sa.Port >> 8) 384 p[1] = byte(sa.Port) 385 sa.raw.Scope_id = sa.ZoneId 386 for i := 0; i < len(sa.Addr); i++ { 387 sa.raw.Addr[i] = sa.Addr[i] 388 } 389 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil 390 } 391 392 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { 393 name := sa.Name 394 n := len(name) 395 if n >= len(sa.raw.Path) { 396 return nil, 0, EINVAL 397 } 398 sa.raw.Family = AF_UNIX 399 for i := 0; i < n; i++ { 400 sa.raw.Path[i] = int8(name[i]) 401 } 402 // length is family (uint16), name, NUL. 403 sl := _Socklen(2) 404 if n > 0 { 405 sl += _Socklen(n) + 1 406 } 407 if sa.raw.Path[0] == '@' { 408 sa.raw.Path[0] = 0 409 // Don't count trailing NUL for abstract address. 410 sl-- 411 } 412 413 return unsafe.Pointer(&sa.raw), sl, nil 414 } 415 416 // SockaddrLinklayer implements the Sockaddr interface for AF_PACKET type sockets. 417 type SockaddrLinklayer struct { 418 Protocol uint16 419 Ifindex int 420 Hatype uint16 421 Pkttype uint8 422 Halen uint8 423 Addr [8]byte 424 raw RawSockaddrLinklayer 425 } 426 427 func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { 428 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 429 return nil, 0, EINVAL 430 } 431 sa.raw.Family = AF_PACKET 432 sa.raw.Protocol = sa.Protocol 433 sa.raw.Ifindex = int32(sa.Ifindex) 434 sa.raw.Hatype = sa.Hatype 435 sa.raw.Pkttype = sa.Pkttype 436 sa.raw.Halen = sa.Halen 437 for i := 0; i < len(sa.Addr); i++ { 438 sa.raw.Addr[i] = sa.Addr[i] 439 } 440 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil 441 } 442 443 // SockaddrNetlink implements the Sockaddr interface for AF_NETLINK type sockets. 444 type SockaddrNetlink struct { 445 Family uint16 446 Pad uint16 447 Pid uint32 448 Groups uint32 449 raw RawSockaddrNetlink 450 } 451 452 func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 453 sa.raw.Family = AF_NETLINK 454 sa.raw.Pad = sa.Pad 455 sa.raw.Pid = sa.Pid 456 sa.raw.Groups = sa.Groups 457 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil 458 } 459 460 // SockaddrHCI implements the Sockaddr interface for AF_BLUETOOTH type sockets 461 // using the HCI protocol. 462 type SockaddrHCI struct { 463 Dev uint16 464 Channel uint16 465 raw RawSockaddrHCI 466 } 467 468 func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 469 sa.raw.Family = AF_BLUETOOTH 470 sa.raw.Dev = sa.Dev 471 sa.raw.Channel = sa.Channel 472 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil 473 } 474 475 // SockaddrL2 implements the Sockaddr interface for AF_BLUETOOTH type sockets 476 // using the L2CAP protocol. 477 type SockaddrL2 struct { 478 PSM uint16 479 CID uint16 480 Addr [6]uint8 481 AddrType uint8 482 raw RawSockaddrL2 483 } 484 485 func (sa *SockaddrL2) sockaddr() (unsafe.Pointer, _Socklen, error) { 486 sa.raw.Family = AF_BLUETOOTH 487 psm := (*[2]byte)(unsafe.Pointer(&sa.raw.Psm)) 488 psm[0] = byte(sa.PSM) 489 psm[1] = byte(sa.PSM >> 8) 490 for i := 0; i < len(sa.Addr); i++ { 491 sa.raw.Bdaddr[i] = sa.Addr[len(sa.Addr)-1-i] 492 } 493 cid := (*[2]byte)(unsafe.Pointer(&sa.raw.Cid)) 494 cid[0] = byte(sa.CID) 495 cid[1] = byte(sa.CID >> 8) 496 sa.raw.Bdaddr_type = sa.AddrType 497 return unsafe.Pointer(&sa.raw), SizeofSockaddrL2, nil 498 } 499 500 // SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets. 501 // The RxID and TxID fields are used for transport protocol addressing in 502 // (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with 503 // zero values for CAN_RAW and CAN_BCM sockets as they have no meaning. 504 // 505 // The SockaddrCAN struct must be bound to the socket file descriptor 506 // using Bind before the CAN socket can be used. 507 // 508 // // Read one raw CAN frame 509 // fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW) 510 // addr := &SockaddrCAN{Ifindex: index} 511 // Bind(fd, addr) 512 // frame := make([]byte, 16) 513 // Read(fd, frame) 514 // 515 // The full SocketCAN documentation can be found in the linux kernel 516 // archives at: https://www.kernel.org/doc/Documentation/networking/can.txt 517 type SockaddrCAN struct { 518 Ifindex int 519 RxID uint32 520 TxID uint32 521 raw RawSockaddrCAN 522 } 523 524 func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { 525 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 526 return nil, 0, EINVAL 527 } 528 sa.raw.Family = AF_CAN 529 sa.raw.Ifindex = int32(sa.Ifindex) 530 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) 531 for i := 0; i < 4; i++ { 532 sa.raw.Addr[i] = rx[i] 533 } 534 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) 535 for i := 0; i < 4; i++ { 536 sa.raw.Addr[i+4] = tx[i] 537 } 538 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil 539 } 540 541 // SockaddrALG implements the Sockaddr interface for AF_ALG type sockets. 542 // SockaddrALG enables userspace access to the Linux kernel's cryptography 543 // subsystem. The Type and Name fields specify which type of hash or cipher 544 // should be used with a given socket. 545 // 546 // To create a file descriptor that provides access to a hash or cipher, both 547 // Bind and Accept must be used. Once the setup process is complete, input 548 // data can be written to the socket, processed by the kernel, and then read 549 // back as hash output or ciphertext. 550 // 551 // Here is an example of using an AF_ALG socket with SHA1 hashing. 552 // The initial socket setup process is as follows: 553 // 554 // // Open a socket to perform SHA1 hashing. 555 // fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0) 556 // addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"} 557 // unix.Bind(fd, addr) 558 // // Note: unix.Accept does not work at this time; must invoke accept() 559 // // manually using unix.Syscall. 560 // hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0) 561 // 562 // Once a file descriptor has been returned from Accept, it may be used to 563 // perform SHA1 hashing. The descriptor is not safe for concurrent use, but 564 // may be re-used repeatedly with subsequent Write and Read operations. 565 // 566 // When hashing a small byte slice or string, a single Write and Read may 567 // be used: 568 // 569 // // Assume hashfd is already configured using the setup process. 570 // hash := os.NewFile(hashfd, "sha1") 571 // // Hash an input string and read the results. Each Write discards 572 // // previous hash state. Read always reads the current state. 573 // b := make([]byte, 20) 574 // for i := 0; i < 2; i++ { 575 // io.WriteString(hash, "Hello, world.") 576 // hash.Read(b) 577 // fmt.Println(hex.EncodeToString(b)) 578 // } 579 // // Output: 580 // // 2ae01472317d1935a84797ec1983ae243fc6aa28 581 // // 2ae01472317d1935a84797ec1983ae243fc6aa28 582 // 583 // For hashing larger byte slices, or byte streams such as those read from 584 // a file or socket, use Sendto with MSG_MORE to instruct the kernel to update 585 // the hash digest instead of creating a new one for a given chunk and finalizing it. 586 // 587 // // Assume hashfd and addr are already configured using the setup process. 588 // hash := os.NewFile(hashfd, "sha1") 589 // // Hash the contents of a file. 590 // f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz") 591 // b := make([]byte, 4096) 592 // for { 593 // n, err := f.Read(b) 594 // if err == io.EOF { 595 // break 596 // } 597 // unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr) 598 // } 599 // hash.Read(b) 600 // fmt.Println(hex.EncodeToString(b)) 601 // // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5 602 // 603 // For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html. 604 type SockaddrALG struct { 605 Type string 606 Name string 607 Feature uint32 608 Mask uint32 609 raw RawSockaddrALG 610 } 611 612 func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) { 613 // Leave room for NUL byte terminator. 614 if len(sa.Type) > 13 { 615 return nil, 0, EINVAL 616 } 617 if len(sa.Name) > 63 { 618 return nil, 0, EINVAL 619 } 620 621 sa.raw.Family = AF_ALG 622 sa.raw.Feat = sa.Feature 623 sa.raw.Mask = sa.Mask 624 625 typ, err := ByteSliceFromString(sa.Type) 626 if err != nil { 627 return nil, 0, err 628 } 629 name, err := ByteSliceFromString(sa.Name) 630 if err != nil { 631 return nil, 0, err 632 } 633 634 copy(sa.raw.Type[:], typ) 635 copy(sa.raw.Name[:], name) 636 637 return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil 638 } 639 640 // SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets. 641 // SockaddrVM provides access to Linux VM sockets: a mechanism that enables 642 // bidirectional communication between a hypervisor and its guest virtual 643 // machines. 644 type SockaddrVM struct { 645 // CID and Port specify a context ID and port address for a VM socket. 646 // Guests have a unique CID, and hosts may have a well-known CID of: 647 // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. 648 // - VMADDR_CID_HOST: refers to other processes on the host. 649 CID uint32 650 Port uint32 651 raw RawSockaddrVM 652 } 653 654 func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { 655 sa.raw.Family = AF_VSOCK 656 sa.raw.Port = sa.Port 657 sa.raw.Cid = sa.CID 658 659 return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil 660 } 661 662 func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { 663 switch rsa.Addr.Family { 664 case AF_NETLINK: 665 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) 666 sa := new(SockaddrNetlink) 667 sa.Family = pp.Family 668 sa.Pad = pp.Pad 669 sa.Pid = pp.Pid 670 sa.Groups = pp.Groups 671 return sa, nil 672 673 case AF_PACKET: 674 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa)) 675 sa := new(SockaddrLinklayer) 676 sa.Protocol = pp.Protocol 677 sa.Ifindex = int(pp.Ifindex) 678 sa.Hatype = pp.Hatype 679 sa.Pkttype = pp.Pkttype 680 sa.Halen = pp.Halen 681 for i := 0; i < len(sa.Addr); i++ { 682 sa.Addr[i] = pp.Addr[i] 683 } 684 return sa, nil 685 686 case AF_UNIX: 687 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) 688 sa := new(SockaddrUnix) 689 if pp.Path[0] == 0 { 690 // "Abstract" Unix domain socket. 691 // Rewrite leading NUL as @ for textual display. 692 // (This is the standard convention.) 693 // Not friendly to overwrite in place, 694 // but the callers below don't care. 695 pp.Path[0] = '@' 696 } 697 698 // Assume path ends at NUL. 699 // This is not technically the Linux semantics for 700 // abstract Unix domain sockets--they are supposed 701 // to be uninterpreted fixed-size binary blobs--but 702 // everyone uses this convention. 703 n := 0 704 for n < len(pp.Path) && pp.Path[n] != 0 { 705 n++ 706 } 707 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] 708 sa.Name = string(bytes) 709 return sa, nil 710 711 case AF_INET: 712 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 713 sa := new(SockaddrInet4) 714 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 715 sa.Port = int(p[0])<<8 + int(p[1]) 716 for i := 0; i < len(sa.Addr); i++ { 717 sa.Addr[i] = pp.Addr[i] 718 } 719 return sa, nil 720 721 case AF_INET6: 722 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 723 sa := new(SockaddrInet6) 724 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 725 sa.Port = int(p[0])<<8 + int(p[1]) 726 sa.ZoneId = pp.Scope_id 727 for i := 0; i < len(sa.Addr); i++ { 728 sa.Addr[i] = pp.Addr[i] 729 } 730 return sa, nil 731 732 case AF_VSOCK: 733 pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) 734 sa := &SockaddrVM{ 735 CID: pp.Cid, 736 Port: pp.Port, 737 } 738 return sa, nil 739 } 740 return nil, EAFNOSUPPORT 741 } 742 743 func Accept(fd int) (nfd int, sa Sockaddr, err error) { 744 var rsa RawSockaddrAny 745 var len _Socklen = SizeofSockaddrAny 746 nfd, err = accept(fd, &rsa, &len) 747 if err != nil { 748 return 749 } 750 sa, err = anyToSockaddr(&rsa) 751 if err != nil { 752 Close(nfd) 753 nfd = 0 754 } 755 return 756 } 757 758 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { 759 var rsa RawSockaddrAny 760 var len _Socklen = SizeofSockaddrAny 761 nfd, err = accept4(fd, &rsa, &len, flags) 762 if err != nil { 763 return 764 } 765 if len > SizeofSockaddrAny { 766 panic("RawSockaddrAny too small") 767 } 768 sa, err = anyToSockaddr(&rsa) 769 if err != nil { 770 Close(nfd) 771 nfd = 0 772 } 773 return 774 } 775 776 func Getsockname(fd int) (sa Sockaddr, err error) { 777 var rsa RawSockaddrAny 778 var len _Socklen = SizeofSockaddrAny 779 if err = getsockname(fd, &rsa, &len); err != nil { 780 return 781 } 782 return anyToSockaddr(&rsa) 783 } 784 785 func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { 786 vallen := _Socklen(4) 787 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) 788 return value, err 789 } 790 791 func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { 792 var value IPMreq 793 vallen := _Socklen(SizeofIPMreq) 794 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 795 return &value, err 796 } 797 798 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 799 var value IPMreqn 800 vallen := _Socklen(SizeofIPMreqn) 801 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 802 return &value, err 803 } 804 805 func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { 806 var value IPv6Mreq 807 vallen := _Socklen(SizeofIPv6Mreq) 808 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 809 return &value, err 810 } 811 812 func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { 813 var value IPv6MTUInfo 814 vallen := _Socklen(SizeofIPv6MTUInfo) 815 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 816 return &value, err 817 } 818 819 func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { 820 var value ICMPv6Filter 821 vallen := _Socklen(SizeofICMPv6Filter) 822 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 823 return &value, err 824 } 825 826 func GetsockoptUcred(fd, level, opt int) (*Ucred, error) { 827 var value Ucred 828 vallen := _Socklen(SizeofUcred) 829 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 830 return &value, err 831 } 832 833 func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) { 834 var value TCPInfo 835 vallen := _Socklen(SizeofTCPInfo) 836 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 837 return &value, err 838 } 839 840 // GetsockoptString returns the string value of the socket option opt for the 841 // socket associated with fd at the given socket level. 842 func GetsockoptString(fd, level, opt int) (string, error) { 843 buf := make([]byte, 256) 844 vallen := _Socklen(len(buf)) 845 err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 846 if err != nil { 847 if err == ERANGE { 848 buf = make([]byte, vallen) 849 err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 850 } 851 if err != nil { 852 return "", err 853 } 854 } 855 return string(buf[:vallen-1]), nil 856 } 857 858 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 859 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 860 } 861 862 // Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html) 863 864 // KeyctlInt calls keyctl commands in which each argument is an int. 865 // These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK, 866 // KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT, 867 // KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT, 868 // KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT. 869 //sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL 870 871 // KeyctlBuffer calls keyctl commands in which the third and fourth 872 // arguments are a buffer and its length, respectively. 873 // These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE. 874 //sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL 875 876 // KeyctlString calls keyctl commands which return a string. 877 // These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY. 878 func KeyctlString(cmd int, id int) (string, error) { 879 // We must loop as the string data may change in between the syscalls. 880 // We could allocate a large buffer here to reduce the chance that the 881 // syscall needs to be called twice; however, this is unnecessary as 882 // the performance loss is negligible. 883 var buffer []byte 884 for { 885 // Try to fill the buffer with data 886 length, err := KeyctlBuffer(cmd, id, buffer, 0) 887 if err != nil { 888 return "", err 889 } 890 891 // Check if the data was written 892 if length <= len(buffer) { 893 // Exclude the null terminator 894 return string(buffer[:length-1]), nil 895 } 896 897 // Make a bigger buffer if needed 898 buffer = make([]byte, length) 899 } 900 } 901 902 // Keyctl commands with special signatures. 903 904 // KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command. 905 // See the full documentation at: 906 // http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html 907 func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) { 908 createInt := 0 909 if create { 910 createInt = 1 911 } 912 return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0) 913 } 914 915 // KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the 916 // key handle permission mask as described in the "keyctl setperm" section of 917 // http://man7.org/linux/man-pages/man1/keyctl.1.html. 918 // See the full documentation at: 919 // http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html 920 func KeyctlSetperm(id int, perm uint32) error { 921 _, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0) 922 return err 923 } 924 925 //sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL 926 927 // KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command. 928 // See the full documentation at: 929 // http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html 930 func KeyctlJoinSessionKeyring(name string) (ringid int, err error) { 931 return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name) 932 } 933 934 //sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL 935 936 // KeyctlSearch implements the KEYCTL_SEARCH command. 937 // See the full documentation at: 938 // http://man7.org/linux/man-pages/man3/keyctl_search.3.html 939 func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) { 940 return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid) 941 } 942 943 //sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL 944 945 // KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This 946 // command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice 947 // of Iovec (each of which represents a buffer) instead of a single buffer. 948 // See the full documentation at: 949 // http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html 950 func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error { 951 return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid) 952 } 953 954 //sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL 955 956 // KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command 957 // computes a Diffie-Hellman shared secret based on the provide params. The 958 // secret is written to the provided buffer and the returned size is the number 959 // of bytes written (returning an error if there is insufficient space in the 960 // buffer). If a nil buffer is passed in, this function returns the minimum 961 // buffer length needed to store the appropriate data. Note that this differs 962 // from KEYCTL_READ's behavior which always returns the requested payload size. 963 // See the full documentation at: 964 // http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html 965 func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) { 966 return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer) 967 } 968 969 func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { 970 var msg Msghdr 971 var rsa RawSockaddrAny 972 msg.Name = (*byte)(unsafe.Pointer(&rsa)) 973 msg.Namelen = uint32(SizeofSockaddrAny) 974 var iov Iovec 975 if len(p) > 0 { 976 iov.Base = &p[0] 977 iov.SetLen(len(p)) 978 } 979 var dummy byte 980 if len(oob) > 0 { 981 var sockType int 982 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 983 if err != nil { 984 return 985 } 986 // receive at least one normal byte 987 if sockType != SOCK_DGRAM && len(p) == 0 { 988 iov.Base = &dummy 989 iov.SetLen(1) 990 } 991 msg.Control = &oob[0] 992 msg.SetControllen(len(oob)) 993 } 994 msg.Iov = &iov 995 msg.Iovlen = 1 996 if n, err = recvmsg(fd, &msg, flags); err != nil { 997 return 998 } 999 oobn = int(msg.Controllen) 1000 recvflags = int(msg.Flags) 1001 // source address is only specified if the socket is unconnected 1002 if rsa.Addr.Family != AF_UNSPEC { 1003 from, err = anyToSockaddr(&rsa) 1004 } 1005 return 1006 } 1007 1008 func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { 1009 _, err = SendmsgN(fd, p, oob, to, flags) 1010 return 1011 } 1012 1013 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { 1014 var ptr unsafe.Pointer 1015 var salen _Socklen 1016 if to != nil { 1017 var err error 1018 ptr, salen, err = to.sockaddr() 1019 if err != nil { 1020 return 0, err 1021 } 1022 } 1023 var msg Msghdr 1024 msg.Name = (*byte)(ptr) 1025 msg.Namelen = uint32(salen) 1026 var iov Iovec 1027 if len(p) > 0 { 1028 iov.Base = &p[0] 1029 iov.SetLen(len(p)) 1030 } 1031 var dummy byte 1032 if len(oob) > 0 { 1033 var sockType int 1034 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 1035 if err != nil { 1036 return 0, err 1037 } 1038 // send at least one normal byte 1039 if sockType != SOCK_DGRAM && len(p) == 0 { 1040 iov.Base = &dummy 1041 iov.SetLen(1) 1042 } 1043 msg.Control = &oob[0] 1044 msg.SetControllen(len(oob)) 1045 } 1046 msg.Iov = &iov 1047 msg.Iovlen = 1 1048 if n, err = sendmsg(fd, &msg, flags); err != nil { 1049 return 0, err 1050 } 1051 if len(oob) > 0 && len(p) == 0 { 1052 n = 0 1053 } 1054 return n, nil 1055 } 1056 1057 // BindToDevice binds the socket associated with fd to device. 1058 func BindToDevice(fd int, device string) (err error) { 1059 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device) 1060 } 1061 1062 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 1063 1064 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) { 1065 // The peek requests are machine-size oriented, so we wrap it 1066 // to retrieve arbitrary-length data. 1067 1068 // The ptrace syscall differs from glibc's ptrace. 1069 // Peeks returns the word in *data, not as the return value. 1070 1071 var buf [sizeofPtr]byte 1072 1073 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned 1074 // access (PEEKUSER warns that it might), but if we don't 1075 // align our reads, we might straddle an unmapped page 1076 // boundary and not get the bytes leading up to the page 1077 // boundary. 1078 n := 0 1079 if addr%sizeofPtr != 0 { 1080 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1081 if err != nil { 1082 return 0, err 1083 } 1084 n += copy(out, buf[addr%sizeofPtr:]) 1085 out = out[n:] 1086 } 1087 1088 // Remainder. 1089 for len(out) > 0 { 1090 // We use an internal buffer to guarantee alignment. 1091 // It's not documented if this is necessary, but we're paranoid. 1092 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1093 if err != nil { 1094 return n, err 1095 } 1096 copied := copy(out, buf[0:]) 1097 n += copied 1098 out = out[copied:] 1099 } 1100 1101 return n, nil 1102 } 1103 1104 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) { 1105 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out) 1106 } 1107 1108 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) { 1109 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out) 1110 } 1111 1112 func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) { 1113 return ptracePeek(PTRACE_PEEKUSR, pid, addr, out) 1114 } 1115 1116 func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) { 1117 // As for ptracePeek, we need to align our accesses to deal 1118 // with the possibility of straddling an invalid page. 1119 1120 // Leading edge. 1121 n := 0 1122 if addr%sizeofPtr != 0 { 1123 var buf [sizeofPtr]byte 1124 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1125 if err != nil { 1126 return 0, err 1127 } 1128 n += copy(buf[addr%sizeofPtr:], data) 1129 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1130 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) 1131 if err != nil { 1132 return 0, err 1133 } 1134 data = data[n:] 1135 } 1136 1137 // Interior. 1138 for len(data) > sizeofPtr { 1139 word := *((*uintptr)(unsafe.Pointer(&data[0]))) 1140 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1141 if err != nil { 1142 return n, err 1143 } 1144 n += sizeofPtr 1145 data = data[sizeofPtr:] 1146 } 1147 1148 // Trailing edge. 1149 if len(data) > 0 { 1150 var buf [sizeofPtr]byte 1151 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1152 if err != nil { 1153 return n, err 1154 } 1155 copy(buf[0:], data) 1156 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1157 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1158 if err != nil { 1159 return n, err 1160 } 1161 n += len(data) 1162 } 1163 1164 return n, nil 1165 } 1166 1167 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) { 1168 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data) 1169 } 1170 1171 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) { 1172 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data) 1173 } 1174 1175 func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) { 1176 return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data) 1177 } 1178 1179 func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) { 1180 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout))) 1181 } 1182 1183 func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) { 1184 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs))) 1185 } 1186 1187 func PtraceSetOptions(pid int, options int) (err error) { 1188 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options)) 1189 } 1190 1191 func PtraceGetEventMsg(pid int) (msg uint, err error) { 1192 var data _C_long 1193 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data))) 1194 msg = uint(data) 1195 return 1196 } 1197 1198 func PtraceCont(pid int, signal int) (err error) { 1199 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal)) 1200 } 1201 1202 func PtraceSyscall(pid int, signal int) (err error) { 1203 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal)) 1204 } 1205 1206 func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } 1207 1208 func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } 1209 1210 func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } 1211 1212 //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) 1213 1214 func Reboot(cmd int) (err error) { 1215 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") 1216 } 1217 1218 func ReadDirent(fd int, buf []byte) (n int, err error) { 1219 return Getdents(fd, buf) 1220 } 1221 1222 //sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) 1223 1224 func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) { 1225 // Certain file systems get rather angry and EINVAL if you give 1226 // them an empty string of data, rather than NULL. 1227 if data == "" { 1228 return mount(source, target, fstype, flags, nil) 1229 } 1230 datap, err := BytePtrFromString(data) 1231 if err != nil { 1232 return err 1233 } 1234 return mount(source, target, fstype, flags, datap) 1235 } 1236 1237 // Sendto 1238 // Recvfrom 1239 // Socketpair 1240 1241 /* 1242 * Direct access 1243 */ 1244 //sys Acct(path string) (err error) 1245 //sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error) 1246 //sys Adjtimex(buf *Timex) (state int, err error) 1247 //sys Chdir(path string) (err error) 1248 //sys Chroot(path string) (err error) 1249 //sys ClockGettime(clockid int32, time *Timespec) (err error) 1250 //sys Close(fd int) (err error) 1251 //sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 1252 //sys Dup(oldfd int) (fd int, err error) 1253 //sys Dup3(oldfd int, newfd int, flags int) (err error) 1254 //sysnb EpollCreate(size int) (fd int, err error) 1255 //sysnb EpollCreate1(flag int) (fd int, err error) 1256 //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) 1257 //sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2 1258 //sys Exit(code int) = SYS_EXIT_GROUP 1259 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 1260 //sys Fallocate(fd int, mode uint32, off int64, len int64) (err error) 1261 //sys Fchdir(fd int) (err error) 1262 //sys Fchmod(fd int, mode uint32) (err error) 1263 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 1264 //sys fcntl(fd int, cmd int, arg int) (val int, err error) 1265 //sys Fdatasync(fd int) (err error) 1266 //sys Flock(fd int, how int) (err error) 1267 //sys Fsync(fd int) (err error) 1268 //sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64 1269 //sysnb Getpgid(pid int) (pgid int, err error) 1270 1271 func Getpgrp() (pid int) { 1272 pid, _ = Getpgid(0) 1273 return 1274 } 1275 1276 //sysnb Getpid() (pid int) 1277 //sysnb Getppid() (ppid int) 1278 //sys Getpriority(which int, who int) (prio int, err error) 1279 //sys Getrandom(buf []byte, flags int) (n int, err error) 1280 //sysnb Getrusage(who int, rusage *Rusage) (err error) 1281 //sysnb Getsid(pid int) (sid int, err error) 1282 //sysnb Gettid() (tid int) 1283 //sys Getxattr(path string, attr string, dest []byte) (sz int, err error) 1284 //sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) 1285 //sysnb InotifyInit1(flags int) (fd int, err error) 1286 //sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) 1287 //sysnb Kill(pid int, sig syscall.Signal) (err error) 1288 //sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG 1289 //sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error) 1290 //sys Listxattr(path string, dest []byte) (sz int, err error) 1291 //sys Llistxattr(path string, dest []byte) (sz int, err error) 1292 //sys Lremovexattr(path string, attr string) (err error) 1293 //sys Lsetxattr(path string, attr string, data []byte, flags int) (err error) 1294 //sys Mkdirat(dirfd int, path string, mode uint32) (err error) 1295 //sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error) 1296 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 1297 //sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT 1298 //sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 1299 //sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) 1300 //sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6 1301 //sys read(fd int, p []byte) (n int, err error) 1302 //sys Removexattr(path string, attr string) (err error) 1303 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 1304 //sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error) 1305 //sys Setdomainname(p []byte) (err error) 1306 //sys Sethostname(p []byte) (err error) 1307 //sysnb Setpgid(pid int, pgid int) (err error) 1308 //sysnb Setsid() (pid int, err error) 1309 //sysnb Settimeofday(tv *Timeval) (err error) 1310 //sys Setns(fd int, nstype int) (err error) 1311 1312 // issue 1435. 1313 // On linux Setuid and Setgid only affects the current thread, not the process. 1314 // This does not match what most callers expect so we must return an error 1315 // here rather than letting the caller think that the call succeeded. 1316 1317 func Setuid(uid int) (err error) { 1318 return EOPNOTSUPP 1319 } 1320 1321 func Setgid(uid int) (err error) { 1322 return EOPNOTSUPP 1323 } 1324 1325 //sys Setpriority(which int, who int, prio int) (err error) 1326 //sys Setxattr(path string, attr string, data []byte, flags int) (err error) 1327 //sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error) 1328 //sys Sync() 1329 //sys Syncfs(fd int) (err error) 1330 //sysnb Sysinfo(info *Sysinfo_t) (err error) 1331 //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) 1332 //sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) 1333 //sysnb Times(tms *Tms) (ticks uintptr, err error) 1334 //sysnb Umask(mask int) (oldmask int) 1335 //sysnb Uname(buf *Utsname) (err error) 1336 //sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2 1337 //sys Unshare(flags int) (err error) 1338 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 1339 //sys write(fd int, p []byte) (n int, err error) 1340 //sys exitThread(code int) (err error) = SYS_EXIT 1341 //sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ 1342 //sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE 1343 1344 // mmap varies by architecture; see syscall_linux_*.go. 1345 //sys munmap(addr uintptr, length uintptr) (err error) 1346 1347 var mapper = &mmapper{ 1348 active: make(map[*byte][]byte), 1349 mmap: mmap, 1350 munmap: munmap, 1351 } 1352 1353 func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { 1354 return mapper.Mmap(fd, offset, length, prot, flags) 1355 } 1356 1357 func Munmap(b []byte) (err error) { 1358 return mapper.Munmap(b) 1359 } 1360 1361 //sys Madvise(b []byte, advice int) (err error) 1362 //sys Mprotect(b []byte, prot int) (err error) 1363 //sys Mlock(b []byte) (err error) 1364 //sys Mlockall(flags int) (err error) 1365 //sys Msync(b []byte, flags int) (err error) 1366 //sys Munlock(b []byte) (err error) 1367 //sys Munlockall() (err error) 1368 1369 // Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd, 1370 // using the specified flags. 1371 func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { 1372 n, _, errno := Syscall6( 1373 SYS_VMSPLICE, 1374 uintptr(fd), 1375 uintptr(unsafe.Pointer(&iovs[0])), 1376 uintptr(len(iovs)), 1377 uintptr(flags), 1378 0, 1379 0, 1380 ) 1381 if errno != 0 { 1382 return 0, syscall.Errno(errno) 1383 } 1384 1385 return int(n), nil 1386 } 1387 1388 /* 1389 * Unimplemented 1390 */ 1391 // AfsSyscall 1392 // Alarm 1393 // ArchPrctl 1394 // Brk 1395 // Capget 1396 // Capset 1397 // ClockGetres 1398 // ClockNanosleep 1399 // ClockSettime 1400 // Clone 1401 // CreateModule 1402 // DeleteModule 1403 // EpollCtlOld 1404 // EpollPwait 1405 // EpollWaitOld 1406 // Execve 1407 // Fgetxattr 1408 // Flistxattr 1409 // Fork 1410 // Fremovexattr 1411 // Fsetxattr 1412 // Futex 1413 // GetKernelSyms 1414 // GetMempolicy 1415 // GetRobustList 1416 // GetThreadArea 1417 // Getitimer 1418 // Getpmsg 1419 // IoCancel 1420 // IoDestroy 1421 // IoGetevents 1422 // IoSetup 1423 // IoSubmit 1424 // IoprioGet 1425 // IoprioSet 1426 // KexecLoad 1427 // LookupDcookie 1428 // Mbind 1429 // MigratePages 1430 // Mincore 1431 // ModifyLdt 1432 // Mount 1433 // MovePages 1434 // MqGetsetattr 1435 // MqNotify 1436 // MqOpen 1437 // MqTimedreceive 1438 // MqTimedsend 1439 // MqUnlink 1440 // Mremap 1441 // Msgctl 1442 // Msgget 1443 // Msgrcv 1444 // Msgsnd 1445 // Nfsservctl 1446 // Personality 1447 // Pselect6 1448 // Ptrace 1449 // Putpmsg 1450 // QueryModule 1451 // Quotactl 1452 // Readahead 1453 // Readv 1454 // RemapFilePages 1455 // RestartSyscall 1456 // RtSigaction 1457 // RtSigpending 1458 // RtSigprocmask 1459 // RtSigqueueinfo 1460 // RtSigreturn 1461 // RtSigsuspend 1462 // RtSigtimedwait 1463 // SchedGetPriorityMax 1464 // SchedGetPriorityMin 1465 // SchedGetparam 1466 // SchedGetscheduler 1467 // SchedRrGetInterval 1468 // SchedSetparam 1469 // SchedYield 1470 // Security 1471 // Semctl 1472 // Semget 1473 // Semop 1474 // Semtimedop 1475 // SetMempolicy 1476 // SetRobustList 1477 // SetThreadArea 1478 // SetTidAddress 1479 // Shmat 1480 // Shmctl 1481 // Shmdt 1482 // Shmget 1483 // Sigaltstack 1484 // Signalfd 1485 // Swapoff 1486 // Swapon 1487 // Sysfs 1488 // TimerCreate 1489 // TimerDelete 1490 // TimerGetoverrun 1491 // TimerGettime 1492 // TimerSettime 1493 // Timerfd 1494 // Tkill (obsolete) 1495 // Tuxcall 1496 // Umount2 1497 // Uselib 1498 // Utimensat 1499 // Vfork 1500 // Vhangup 1501 // Vserver 1502 // Waitid 1503 // _Sysctl