github.com/juelite/golang.org-x-sys@v0.0.0-20181121071242-7b69e1c5db33/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 Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) 40 41 func Link(oldpath string, newpath string) (err error) { 42 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) 43 } 44 45 func Mkdir(path string, mode uint32) (err error) { 46 return Mkdirat(AT_FDCWD, path, mode) 47 } 48 49 func Mknod(path string, mode uint32, dev int) (err error) { 50 return Mknodat(AT_FDCWD, path, mode, dev) 51 } 52 53 func Open(path string, mode int, perm uint32) (fd int, err error) { 54 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm) 55 } 56 57 //sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) 58 59 func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) { 60 return openat(dirfd, path, flags|O_LARGEFILE, mode) 61 } 62 63 //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) 64 65 func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { 66 if len(fds) == 0 { 67 return ppoll(nil, 0, timeout, sigmask) 68 } 69 return ppoll(&fds[0], len(fds), timeout, sigmask) 70 } 71 72 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 73 74 func Readlink(path string, buf []byte) (n int, err error) { 75 return Readlinkat(AT_FDCWD, path, buf) 76 } 77 78 func Rename(oldpath string, newpath string) (err error) { 79 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) 80 } 81 82 func Rmdir(path string) error { 83 return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR) 84 } 85 86 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 87 88 func Symlink(oldpath string, newpath string) (err error) { 89 return Symlinkat(oldpath, AT_FDCWD, newpath) 90 } 91 92 func Unlink(path string) error { 93 return Unlinkat(AT_FDCWD, path, 0) 94 } 95 96 //sys Unlinkat(dirfd int, path string, flags int) (err error) 97 98 //sys utimes(path string, times *[2]Timeval) (err error) 99 100 func Utimes(path string, tv []Timeval) error { 101 if tv == nil { 102 err := utimensat(AT_FDCWD, path, nil, 0) 103 if err != ENOSYS { 104 return err 105 } 106 return utimes(path, nil) 107 } 108 if len(tv) != 2 { 109 return EINVAL 110 } 111 var ts [2]Timespec 112 ts[0] = NsecToTimespec(TimevalToNsec(tv[0])) 113 ts[1] = NsecToTimespec(TimevalToNsec(tv[1])) 114 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 115 if err != ENOSYS { 116 return err 117 } 118 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 119 } 120 121 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) 122 123 func UtimesNano(path string, ts []Timespec) error { 124 if ts == nil { 125 err := utimensat(AT_FDCWD, path, nil, 0) 126 if err != ENOSYS { 127 return err 128 } 129 return utimes(path, nil) 130 } 131 if len(ts) != 2 { 132 return EINVAL 133 } 134 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 135 if err != ENOSYS { 136 return err 137 } 138 // If the utimensat syscall isn't available (utimensat was added to Linux 139 // in 2.6.22, Released, 8 July 2007) then fall back to utimes 140 var tv [2]Timeval 141 for i := 0; i < 2; i++ { 142 tv[i] = NsecToTimeval(TimespecToNsec(ts[i])) 143 } 144 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 145 } 146 147 func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { 148 if ts == nil { 149 return utimensat(dirfd, path, nil, flags) 150 } 151 if len(ts) != 2 { 152 return EINVAL 153 } 154 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags) 155 } 156 157 //sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error) 158 159 func Futimesat(dirfd int, path string, tv []Timeval) error { 160 pathp, err := BytePtrFromString(path) 161 if err != nil { 162 return err 163 } 164 if tv == nil { 165 return futimesat(dirfd, pathp, nil) 166 } 167 if len(tv) != 2 { 168 return EINVAL 169 } 170 return futimesat(dirfd, pathp, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 171 } 172 173 func Futimes(fd int, tv []Timeval) (err error) { 174 // Believe it or not, this is the best we can do on Linux 175 // (and is what glibc does). 176 return Utimes("/proc/self/fd/"+itoa(fd), tv) 177 } 178 179 const ImplementsGetwd = true 180 181 //sys Getcwd(buf []byte) (n int, err error) 182 183 func Getwd() (wd string, err error) { 184 var buf [PathMax]byte 185 n, err := Getcwd(buf[0:]) 186 if err != nil { 187 return "", err 188 } 189 // Getcwd returns the number of bytes written to buf, including the NUL. 190 if n < 1 || n > len(buf) || buf[n-1] != 0 { 191 return "", EINVAL 192 } 193 return string(buf[0 : n-1]), nil 194 } 195 196 func Getgroups() (gids []int, err error) { 197 n, err := getgroups(0, nil) 198 if err != nil { 199 return nil, err 200 } 201 if n == 0 { 202 return nil, nil 203 } 204 205 // Sanity check group count. Max is 1<<16 on Linux. 206 if n < 0 || n > 1<<20 { 207 return nil, EINVAL 208 } 209 210 a := make([]_Gid_t, n) 211 n, err = getgroups(n, &a[0]) 212 if err != nil { 213 return nil, err 214 } 215 gids = make([]int, n) 216 for i, v := range a[0:n] { 217 gids[i] = int(v) 218 } 219 return 220 } 221 222 func Setgroups(gids []int) (err error) { 223 if len(gids) == 0 { 224 return setgroups(0, nil) 225 } 226 227 a := make([]_Gid_t, len(gids)) 228 for i, v := range gids { 229 a[i] = _Gid_t(v) 230 } 231 return setgroups(len(a), &a[0]) 232 } 233 234 type WaitStatus uint32 235 236 // Wait status is 7 bits at bottom, either 0 (exited), 237 // 0x7F (stopped), or a signal number that caused an exit. 238 // The 0x80 bit is whether there was a core dump. 239 // An extra number (exit code, signal causing a stop) 240 // is in the high bits. At least that's the idea. 241 // There are various irregularities. For example, the 242 // "continued" status is 0xFFFF, distinguishing itself 243 // from stopped via the core dump bit. 244 245 const ( 246 mask = 0x7F 247 core = 0x80 248 exited = 0x00 249 stopped = 0x7F 250 shift = 8 251 ) 252 253 func (w WaitStatus) Exited() bool { return w&mask == exited } 254 255 func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } 256 257 func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } 258 259 func (w WaitStatus) Continued() bool { return w == 0xFFFF } 260 261 func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } 262 263 func (w WaitStatus) ExitStatus() int { 264 if !w.Exited() { 265 return -1 266 } 267 return int(w>>shift) & 0xFF 268 } 269 270 func (w WaitStatus) Signal() syscall.Signal { 271 if !w.Signaled() { 272 return -1 273 } 274 return syscall.Signal(w & mask) 275 } 276 277 func (w WaitStatus) StopSignal() syscall.Signal { 278 if !w.Stopped() { 279 return -1 280 } 281 return syscall.Signal(w>>shift) & 0xFF 282 } 283 284 func (w WaitStatus) TrapCause() int { 285 if w.StopSignal() != SIGTRAP { 286 return -1 287 } 288 return int(w>>shift) >> 8 289 } 290 291 //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) 292 293 func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) { 294 var status _C_int 295 wpid, err = wait4(pid, &status, options, rusage) 296 if wstatus != nil { 297 *wstatus = WaitStatus(status) 298 } 299 return 300 } 301 302 func Mkfifo(path string, mode uint32) (err error) { 303 return Mknod(path, mode|S_IFIFO, 0) 304 } 305 306 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) { 307 if sa.Port < 0 || sa.Port > 0xFFFF { 308 return nil, 0, EINVAL 309 } 310 sa.raw.Family = AF_INET 311 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 312 p[0] = byte(sa.Port >> 8) 313 p[1] = byte(sa.Port) 314 for i := 0; i < len(sa.Addr); i++ { 315 sa.raw.Addr[i] = sa.Addr[i] 316 } 317 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil 318 } 319 320 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) { 321 if sa.Port < 0 || sa.Port > 0xFFFF { 322 return nil, 0, EINVAL 323 } 324 sa.raw.Family = AF_INET6 325 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 326 p[0] = byte(sa.Port >> 8) 327 p[1] = byte(sa.Port) 328 sa.raw.Scope_id = sa.ZoneId 329 for i := 0; i < len(sa.Addr); i++ { 330 sa.raw.Addr[i] = sa.Addr[i] 331 } 332 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil 333 } 334 335 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { 336 name := sa.Name 337 n := len(name) 338 if n >= len(sa.raw.Path) { 339 return nil, 0, EINVAL 340 } 341 sa.raw.Family = AF_UNIX 342 for i := 0; i < n; i++ { 343 sa.raw.Path[i] = int8(name[i]) 344 } 345 // length is family (uint16), name, NUL. 346 sl := _Socklen(2) 347 if n > 0 { 348 sl += _Socklen(n) + 1 349 } 350 if sa.raw.Path[0] == '@' { 351 sa.raw.Path[0] = 0 352 // Don't count trailing NUL for abstract address. 353 sl-- 354 } 355 356 return unsafe.Pointer(&sa.raw), sl, nil 357 } 358 359 type SockaddrLinklayer struct { 360 Protocol uint16 361 Ifindex int 362 Hatype uint16 363 Pkttype uint8 364 Halen uint8 365 Addr [8]byte 366 raw RawSockaddrLinklayer 367 } 368 369 func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { 370 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 371 return nil, 0, EINVAL 372 } 373 sa.raw.Family = AF_PACKET 374 sa.raw.Protocol = sa.Protocol 375 sa.raw.Ifindex = int32(sa.Ifindex) 376 sa.raw.Hatype = sa.Hatype 377 sa.raw.Pkttype = sa.Pkttype 378 sa.raw.Halen = sa.Halen 379 for i := 0; i < len(sa.Addr); i++ { 380 sa.raw.Addr[i] = sa.Addr[i] 381 } 382 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil 383 } 384 385 type SockaddrNetlink struct { 386 Family uint16 387 Pad uint16 388 Pid uint32 389 Groups uint32 390 raw RawSockaddrNetlink 391 } 392 393 func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 394 sa.raw.Family = AF_NETLINK 395 sa.raw.Pad = sa.Pad 396 sa.raw.Pid = sa.Pid 397 sa.raw.Groups = sa.Groups 398 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil 399 } 400 401 type SockaddrHCI struct { 402 Dev uint16 403 Channel uint16 404 raw RawSockaddrHCI 405 } 406 407 func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 408 sa.raw.Family = AF_BLUETOOTH 409 sa.raw.Dev = sa.Dev 410 sa.raw.Channel = sa.Channel 411 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil 412 } 413 414 // SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets. 415 // The RxID and TxID fields are used for transport protocol addressing in 416 // (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with 417 // zero values for CAN_RAW and CAN_BCM sockets as they have no meaning. 418 // 419 // The SockaddrCAN struct must be bound to the socket file descriptor 420 // using Bind before the CAN socket can be used. 421 // 422 // // Read one raw CAN frame 423 // fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW) 424 // addr := &SockaddrCAN{Ifindex: index} 425 // Bind(fd, addr) 426 // frame := make([]byte, 16) 427 // Read(fd, frame) 428 // 429 // The full SocketCAN documentation can be found in the linux kernel 430 // archives at: https://www.kernel.org/doc/Documentation/networking/can.txt 431 type SockaddrCAN struct { 432 Ifindex int 433 RxID uint32 434 TxID uint32 435 raw RawSockaddrCAN 436 } 437 438 func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { 439 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 440 return nil, 0, EINVAL 441 } 442 sa.raw.Family = AF_CAN 443 sa.raw.Ifindex = int32(sa.Ifindex) 444 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) 445 for i := 0; i < 4; i++ { 446 sa.raw.Addr[i] = rx[i] 447 } 448 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) 449 for i := 0; i < 4; i++ { 450 sa.raw.Addr[i+4] = tx[i] 451 } 452 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil 453 } 454 455 func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { 456 switch rsa.Addr.Family { 457 case AF_NETLINK: 458 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) 459 sa := new(SockaddrNetlink) 460 sa.Family = pp.Family 461 sa.Pad = pp.Pad 462 sa.Pid = pp.Pid 463 sa.Groups = pp.Groups 464 return sa, nil 465 466 case AF_PACKET: 467 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa)) 468 sa := new(SockaddrLinklayer) 469 sa.Protocol = pp.Protocol 470 sa.Ifindex = int(pp.Ifindex) 471 sa.Hatype = pp.Hatype 472 sa.Pkttype = pp.Pkttype 473 sa.Halen = pp.Halen 474 for i := 0; i < len(sa.Addr); i++ { 475 sa.Addr[i] = pp.Addr[i] 476 } 477 return sa, nil 478 479 case AF_UNIX: 480 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) 481 sa := new(SockaddrUnix) 482 if pp.Path[0] == 0 { 483 // "Abstract" Unix domain socket. 484 // Rewrite leading NUL as @ for textual display. 485 // (This is the standard convention.) 486 // Not friendly to overwrite in place, 487 // but the callers below don't care. 488 pp.Path[0] = '@' 489 } 490 491 // Assume path ends at NUL. 492 // This is not technically the Linux semantics for 493 // abstract Unix domain sockets--they are supposed 494 // to be uninterpreted fixed-size binary blobs--but 495 // everyone uses this convention. 496 n := 0 497 for n < len(pp.Path) && pp.Path[n] != 0 { 498 n++ 499 } 500 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] 501 sa.Name = string(bytes) 502 return sa, nil 503 504 case AF_INET: 505 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 506 sa := new(SockaddrInet4) 507 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 508 sa.Port = int(p[0])<<8 + int(p[1]) 509 for i := 0; i < len(sa.Addr); i++ { 510 sa.Addr[i] = pp.Addr[i] 511 } 512 return sa, nil 513 514 case AF_INET6: 515 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 516 sa := new(SockaddrInet6) 517 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 518 sa.Port = int(p[0])<<8 + int(p[1]) 519 sa.ZoneId = pp.Scope_id 520 for i := 0; i < len(sa.Addr); i++ { 521 sa.Addr[i] = pp.Addr[i] 522 } 523 return sa, nil 524 } 525 return nil, EAFNOSUPPORT 526 } 527 528 func Accept(fd int) (nfd int, sa Sockaddr, err error) { 529 var rsa RawSockaddrAny 530 var len _Socklen = SizeofSockaddrAny 531 nfd, err = accept(fd, &rsa, &len) 532 if err != nil { 533 return 534 } 535 sa, err = anyToSockaddr(&rsa) 536 if err != nil { 537 Close(nfd) 538 nfd = 0 539 } 540 return 541 } 542 543 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { 544 var rsa RawSockaddrAny 545 var len _Socklen = SizeofSockaddrAny 546 nfd, err = accept4(fd, &rsa, &len, flags) 547 if err != nil { 548 return 549 } 550 if len > SizeofSockaddrAny { 551 panic("RawSockaddrAny too small") 552 } 553 sa, err = anyToSockaddr(&rsa) 554 if err != nil { 555 Close(nfd) 556 nfd = 0 557 } 558 return 559 } 560 561 func Getsockname(fd int) (sa Sockaddr, err error) { 562 var rsa RawSockaddrAny 563 var len _Socklen = SizeofSockaddrAny 564 if err = getsockname(fd, &rsa, &len); err != nil { 565 return 566 } 567 return anyToSockaddr(&rsa) 568 } 569 570 func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { 571 vallen := _Socklen(4) 572 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) 573 return value, err 574 } 575 576 func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { 577 var value IPMreq 578 vallen := _Socklen(SizeofIPMreq) 579 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 580 return &value, err 581 } 582 583 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 584 var value IPMreqn 585 vallen := _Socklen(SizeofIPMreqn) 586 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 587 return &value, err 588 } 589 590 func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { 591 var value IPv6Mreq 592 vallen := _Socklen(SizeofIPv6Mreq) 593 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 594 return &value, err 595 } 596 597 func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { 598 var value IPv6MTUInfo 599 vallen := _Socklen(SizeofIPv6MTUInfo) 600 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 601 return &value, err 602 } 603 604 func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { 605 var value ICMPv6Filter 606 vallen := _Socklen(SizeofICMPv6Filter) 607 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 608 return &value, err 609 } 610 611 func GetsockoptUcred(fd, level, opt int) (*Ucred, error) { 612 var value Ucred 613 vallen := _Socklen(SizeofUcred) 614 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 615 return &value, err 616 } 617 618 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 619 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 620 } 621 622 func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { 623 var msg Msghdr 624 var rsa RawSockaddrAny 625 msg.Name = (*byte)(unsafe.Pointer(&rsa)) 626 msg.Namelen = uint32(SizeofSockaddrAny) 627 var iov Iovec 628 if len(p) > 0 { 629 iov.Base = (*byte)(unsafe.Pointer(&p[0])) 630 iov.SetLen(len(p)) 631 } 632 var dummy byte 633 if len(oob) > 0 { 634 // receive at least one normal byte 635 if len(p) == 0 { 636 iov.Base = &dummy 637 iov.SetLen(1) 638 } 639 msg.Control = (*byte)(unsafe.Pointer(&oob[0])) 640 msg.SetControllen(len(oob)) 641 } 642 msg.Iov = &iov 643 msg.Iovlen = 1 644 if n, err = recvmsg(fd, &msg, flags); err != nil { 645 return 646 } 647 oobn = int(msg.Controllen) 648 recvflags = int(msg.Flags) 649 // source address is only specified if the socket is unconnected 650 if rsa.Addr.Family != AF_UNSPEC { 651 from, err = anyToSockaddr(&rsa) 652 } 653 return 654 } 655 656 func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { 657 _, err = SendmsgN(fd, p, oob, to, flags) 658 return 659 } 660 661 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { 662 var ptr unsafe.Pointer 663 var salen _Socklen 664 if to != nil { 665 var err error 666 ptr, salen, err = to.sockaddr() 667 if err != nil { 668 return 0, err 669 } 670 } 671 var msg Msghdr 672 msg.Name = (*byte)(unsafe.Pointer(ptr)) 673 msg.Namelen = uint32(salen) 674 var iov Iovec 675 if len(p) > 0 { 676 iov.Base = (*byte)(unsafe.Pointer(&p[0])) 677 iov.SetLen(len(p)) 678 } 679 var dummy byte 680 if len(oob) > 0 { 681 // send at least one normal byte 682 if len(p) == 0 { 683 iov.Base = &dummy 684 iov.SetLen(1) 685 } 686 msg.Control = (*byte)(unsafe.Pointer(&oob[0])) 687 msg.SetControllen(len(oob)) 688 } 689 msg.Iov = &iov 690 msg.Iovlen = 1 691 if n, err = sendmsg(fd, &msg, flags); err != nil { 692 return 0, err 693 } 694 if len(oob) > 0 && len(p) == 0 { 695 n = 0 696 } 697 return n, nil 698 } 699 700 // BindToDevice binds the socket associated with fd to device. 701 func BindToDevice(fd int, device string) (err error) { 702 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device) 703 } 704 705 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 706 707 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) { 708 // The peek requests are machine-size oriented, so we wrap it 709 // to retrieve arbitrary-length data. 710 711 // The ptrace syscall differs from glibc's ptrace. 712 // Peeks returns the word in *data, not as the return value. 713 714 var buf [sizeofPtr]byte 715 716 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned 717 // access (PEEKUSER warns that it might), but if we don't 718 // align our reads, we might straddle an unmapped page 719 // boundary and not get the bytes leading up to the page 720 // boundary. 721 n := 0 722 if addr%sizeofPtr != 0 { 723 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 724 if err != nil { 725 return 0, err 726 } 727 n += copy(out, buf[addr%sizeofPtr:]) 728 out = out[n:] 729 } 730 731 // Remainder. 732 for len(out) > 0 { 733 // We use an internal buffer to guarantee alignment. 734 // It's not documented if this is necessary, but we're paranoid. 735 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 736 if err != nil { 737 return n, err 738 } 739 copied := copy(out, buf[0:]) 740 n += copied 741 out = out[copied:] 742 } 743 744 return n, nil 745 } 746 747 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) { 748 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out) 749 } 750 751 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) { 752 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out) 753 } 754 755 func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) { 756 // As for ptracePeek, we need to align our accesses to deal 757 // with the possibility of straddling an invalid page. 758 759 // Leading edge. 760 n := 0 761 if addr%sizeofPtr != 0 { 762 var buf [sizeofPtr]byte 763 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 764 if err != nil { 765 return 0, err 766 } 767 n += copy(buf[addr%sizeofPtr:], data) 768 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 769 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) 770 if err != nil { 771 return 0, err 772 } 773 data = data[n:] 774 } 775 776 // Interior. 777 for len(data) > sizeofPtr { 778 word := *((*uintptr)(unsafe.Pointer(&data[0]))) 779 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 780 if err != nil { 781 return n, err 782 } 783 n += sizeofPtr 784 data = data[sizeofPtr:] 785 } 786 787 // Trailing edge. 788 if len(data) > 0 { 789 var buf [sizeofPtr]byte 790 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 791 if err != nil { 792 return n, err 793 } 794 copy(buf[0:], data) 795 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 796 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 797 if err != nil { 798 return n, err 799 } 800 n += len(data) 801 } 802 803 return n, nil 804 } 805 806 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) { 807 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data) 808 } 809 810 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) { 811 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data) 812 } 813 814 func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) { 815 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout))) 816 } 817 818 func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) { 819 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs))) 820 } 821 822 func PtraceSetOptions(pid int, options int) (err error) { 823 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options)) 824 } 825 826 func PtraceGetEventMsg(pid int) (msg uint, err error) { 827 var data _C_long 828 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data))) 829 msg = uint(data) 830 return 831 } 832 833 func PtraceCont(pid int, signal int) (err error) { 834 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal)) 835 } 836 837 func PtraceSyscall(pid int, signal int) (err error) { 838 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal)) 839 } 840 841 func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } 842 843 func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } 844 845 func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } 846 847 //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) 848 849 func Reboot(cmd int) (err error) { 850 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") 851 } 852 853 func clen(n []byte) int { 854 for i := 0; i < len(n); i++ { 855 if n[i] == 0 { 856 return i 857 } 858 } 859 return len(n) 860 } 861 862 func ReadDirent(fd int, buf []byte) (n int, err error) { 863 return Getdents(fd, buf) 864 } 865 866 func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) { 867 origlen := len(buf) 868 count = 0 869 for max != 0 && len(buf) > 0 { 870 dirent := (*Dirent)(unsafe.Pointer(&buf[0])) 871 buf = buf[dirent.Reclen:] 872 if dirent.Ino == 0 { // File absent in directory. 873 continue 874 } 875 bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0])) 876 var name = string(bytes[0:clen(bytes[:])]) 877 if name == "." || name == ".." { // Useless names 878 continue 879 } 880 max-- 881 count++ 882 names = append(names, name) 883 } 884 return origlen - len(buf), count, names 885 } 886 887 //sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) 888 889 func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) { 890 // Certain file systems get rather angry and EINVAL if you give 891 // them an empty string of data, rather than NULL. 892 if data == "" { 893 return mount(source, target, fstype, flags, nil) 894 } 895 datap, err := BytePtrFromString(data) 896 if err != nil { 897 return err 898 } 899 return mount(source, target, fstype, flags, datap) 900 } 901 902 // Sendto 903 // Recvfrom 904 // Socketpair 905 906 /* 907 * Direct access 908 */ 909 //sys Acct(path string) (err error) 910 //sys Adjtimex(buf *Timex) (state int, err error) 911 //sys Chdir(path string) (err error) 912 //sys Chroot(path string) (err error) 913 //sys ClockGettime(clockid int32, time *Timespec) (err error) 914 //sys Close(fd int) (err error) 915 //sys Dup(oldfd int) (fd int, err error) 916 //sys Dup3(oldfd int, newfd int, flags int) (err error) 917 //sysnb EpollCreate(size int) (fd int, err error) 918 //sysnb EpollCreate1(flag int) (fd int, err error) 919 //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) 920 //sys Exit(code int) = SYS_EXIT_GROUP 921 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 922 //sys Fallocate(fd int, mode uint32, off int64, len int64) (err error) 923 //sys Fchdir(fd int) (err error) 924 //sys Fchmod(fd int, mode uint32) (err error) 925 //sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) 926 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 927 //sys fcntl(fd int, cmd int, arg int) (val int, err error) 928 //sys Fdatasync(fd int) (err error) 929 //sys Flock(fd int, how int) (err error) 930 //sys Fsync(fd int) (err error) 931 //sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64 932 //sysnb Getpgid(pid int) (pgid int, err error) 933 934 func Getpgrp() (pid int) { 935 pid, _ = Getpgid(0) 936 return 937 } 938 939 //sysnb Getpid() (pid int) 940 //sysnb Getppid() (ppid int) 941 //sys Getpriority(which int, who int) (prio int, err error) 942 //sysnb Getrusage(who int, rusage *Rusage) (err error) 943 //sysnb Getsid(pid int) (sid int, err error) 944 //sysnb Gettid() (tid int) 945 //sys Getxattr(path string, attr string, dest []byte) (sz int, err error) 946 //sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) 947 //sysnb InotifyInit1(flags int) (fd int, err error) 948 //sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) 949 //sysnb Kill(pid int, sig syscall.Signal) (err error) 950 //sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG 951 //sys Listxattr(path string, dest []byte) (sz int, err error) 952 //sys Mkdirat(dirfd int, path string, mode uint32) (err error) 953 //sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error) 954 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 955 //sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT 956 //sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 957 //sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) 958 //sys read(fd int, p []byte) (n int, err error) 959 //sys Removexattr(path string, attr string) (err error) 960 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 961 //sys Setdomainname(p []byte) (err error) 962 //sys Sethostname(p []byte) (err error) 963 //sysnb Setpgid(pid int, pgid int) (err error) 964 //sysnb Setsid() (pid int, err error) 965 //sysnb Settimeofday(tv *Timeval) (err error) 966 //sys Setns(fd int, nstype int) (err error) 967 968 // issue 1435. 969 // On linux Setuid and Setgid only affects the current thread, not the process. 970 // This does not match what most callers expect so we must return an error 971 // here rather than letting the caller think that the call succeeded. 972 973 func Setuid(uid int) (err error) { 974 return EOPNOTSUPP 975 } 976 977 func Setgid(uid int) (err error) { 978 return EOPNOTSUPP 979 } 980 981 //sys Setpriority(which int, who int, prio int) (err error) 982 //sys Setxattr(path string, attr string, data []byte, flags int) (err error) 983 //sys Sync() 984 //sysnb Sysinfo(info *Sysinfo_t) (err error) 985 //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) 986 //sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) 987 //sysnb Times(tms *Tms) (ticks uintptr, err error) 988 //sysnb Umask(mask int) (oldmask int) 989 //sysnb Uname(buf *Utsname) (err error) 990 //sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2 991 //sys Unshare(flags int) (err error) 992 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 993 //sys write(fd int, p []byte) (n int, err error) 994 //sys exitThread(code int) (err error) = SYS_EXIT 995 //sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ 996 //sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE 997 998 // mmap varies by architecture; see syscall_linux_*.go. 999 //sys munmap(addr uintptr, length uintptr) (err error) 1000 1001 var mapper = &mmapper{ 1002 active: make(map[*byte][]byte), 1003 mmap: mmap, 1004 munmap: munmap, 1005 } 1006 1007 func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { 1008 return mapper.Mmap(fd, offset, length, prot, flags) 1009 } 1010 1011 func Munmap(b []byte) (err error) { 1012 return mapper.Munmap(b) 1013 } 1014 1015 //sys Madvise(b []byte, advice int) (err error) 1016 //sys Mprotect(b []byte, prot int) (err error) 1017 //sys Mlock(b []byte) (err error) 1018 //sys Munlock(b []byte) (err error) 1019 //sys Mlockall(flags int) (err error) 1020 //sys Munlockall() (err error) 1021 1022 /* 1023 * Unimplemented 1024 */ 1025 // AddKey 1026 // AfsSyscall 1027 // Alarm 1028 // ArchPrctl 1029 // Brk 1030 // Capget 1031 // Capset 1032 // ClockGetres 1033 // ClockNanosleep 1034 // ClockSettime 1035 // Clone 1036 // CreateModule 1037 // DeleteModule 1038 // EpollCtlOld 1039 // EpollPwait 1040 // EpollWaitOld 1041 // Eventfd 1042 // Execve 1043 // Fgetxattr 1044 // Flistxattr 1045 // Fork 1046 // Fremovexattr 1047 // Fsetxattr 1048 // Futex 1049 // GetKernelSyms 1050 // GetMempolicy 1051 // GetRobustList 1052 // GetThreadArea 1053 // Getitimer 1054 // Getpmsg 1055 // IoCancel 1056 // IoDestroy 1057 // IoGetevents 1058 // IoSetup 1059 // IoSubmit 1060 // Ioctl 1061 // IoprioGet 1062 // IoprioSet 1063 // KexecLoad 1064 // Keyctl 1065 // Lgetxattr 1066 // Llistxattr 1067 // LookupDcookie 1068 // Lremovexattr 1069 // Lsetxattr 1070 // Mbind 1071 // MigratePages 1072 // Mincore 1073 // ModifyLdt 1074 // Mount 1075 // MovePages 1076 // Mprotect 1077 // MqGetsetattr 1078 // MqNotify 1079 // MqOpen 1080 // MqTimedreceive 1081 // MqTimedsend 1082 // MqUnlink 1083 // Mremap 1084 // Msgctl 1085 // Msgget 1086 // Msgrcv 1087 // Msgsnd 1088 // Msync 1089 // Newfstatat 1090 // Nfsservctl 1091 // Personality 1092 // Pselect6 1093 // Ptrace 1094 // Putpmsg 1095 // QueryModule 1096 // Quotactl 1097 // Readahead 1098 // Readv 1099 // RemapFilePages 1100 // RequestKey 1101 // RestartSyscall 1102 // RtSigaction 1103 // RtSigpending 1104 // RtSigprocmask 1105 // RtSigqueueinfo 1106 // RtSigreturn 1107 // RtSigsuspend 1108 // RtSigtimedwait 1109 // SchedGetPriorityMax 1110 // SchedGetPriorityMin 1111 // SchedGetaffinity 1112 // SchedGetparam 1113 // SchedGetscheduler 1114 // SchedRrGetInterval 1115 // SchedSetaffinity 1116 // SchedSetparam 1117 // SchedYield 1118 // Security 1119 // Semctl 1120 // Semget 1121 // Semop 1122 // Semtimedop 1123 // SetMempolicy 1124 // SetRobustList 1125 // SetThreadArea 1126 // SetTidAddress 1127 // Shmat 1128 // Shmctl 1129 // Shmdt 1130 // Shmget 1131 // Sigaltstack 1132 // Signalfd 1133 // Swapoff 1134 // Swapon 1135 // Sysfs 1136 // TimerCreate 1137 // TimerDelete 1138 // TimerGetoverrun 1139 // TimerGettime 1140 // TimerSettime 1141 // Timerfd 1142 // Tkill (obsolete) 1143 // Tuxcall 1144 // Umount2 1145 // Uselib 1146 // Utimensat 1147 // Vfork 1148 // Vhangup 1149 // Vmsplice 1150 // Vserver 1151 // Waitid 1152 // _Sysctl