github.com/aayushi-bansal/sys@v0.0.0-20180118120756-90d962a959d8/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 // SyscallNoError may be used instead of Syscall for syscalls that don't fail. 20 func SyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr) 21 22 // RawSyscallNoError may be used instead of RawSyscall for syscalls that don't 23 // fail. 24 func RawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr) 25 26 /* 27 * Wrapped 28 */ 29 30 func Access(path string, mode uint32) (err error) { 31 return Faccessat(AT_FDCWD, path, mode, 0) 32 } 33 34 func Chmod(path string, mode uint32) (err error) { 35 return Fchmodat(AT_FDCWD, path, mode, 0) 36 } 37 38 func Chown(path string, uid int, gid int) (err error) { 39 return Fchownat(AT_FDCWD, path, uid, gid, 0) 40 } 41 42 func Creat(path string, mode uint32) (fd int, err error) { 43 return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode) 44 } 45 46 //sys fchmodat(dirfd int, path string, mode uint32) (err error) 47 48 func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) { 49 // Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior 50 // and check the flags. Otherwise the mode would be applied to the symlink 51 // destination which is not what the user expects. 52 if flags&^AT_SYMLINK_NOFOLLOW != 0 { 53 return EINVAL 54 } else if flags&AT_SYMLINK_NOFOLLOW != 0 { 55 return EOPNOTSUPP 56 } 57 return fchmodat(dirfd, path, mode) 58 } 59 60 //sys ioctl(fd int, req uint, arg uintptr) (err error) 61 62 // ioctl itself should not be exposed directly, but additional get/set 63 // functions for specific types are permissible. 64 65 // IoctlSetInt performs an ioctl operation which sets an integer value 66 // on fd, using the specified request number. 67 func IoctlSetInt(fd int, req uint, value int) error { 68 return ioctl(fd, req, uintptr(value)) 69 } 70 71 func IoctlSetWinsize(fd int, req uint, value *Winsize) error { 72 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 73 } 74 75 func IoctlSetTermios(fd int, req uint, value *Termios) error { 76 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 77 } 78 79 // IoctlGetInt performs an ioctl operation which gets an integer value 80 // from fd, using the specified request number. 81 func IoctlGetInt(fd int, req uint) (int, error) { 82 var value int 83 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 84 return value, err 85 } 86 87 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 88 var value Winsize 89 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 90 return &value, err 91 } 92 93 func IoctlGetTermios(fd int, req uint) (*Termios, error) { 94 var value Termios 95 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 96 return &value, err 97 } 98 99 //sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) 100 101 func Link(oldpath string, newpath string) (err error) { 102 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) 103 } 104 105 func Mkdir(path string, mode uint32) (err error) { 106 return Mkdirat(AT_FDCWD, path, mode) 107 } 108 109 func Mknod(path string, mode uint32, dev int) (err error) { 110 return Mknodat(AT_FDCWD, path, mode, dev) 111 } 112 113 func Open(path string, mode int, perm uint32) (fd int, err error) { 114 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm) 115 } 116 117 //sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) 118 119 func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) { 120 return openat(dirfd, path, flags|O_LARGEFILE, mode) 121 } 122 123 //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) 124 125 func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { 126 if len(fds) == 0 { 127 return ppoll(nil, 0, timeout, sigmask) 128 } 129 return ppoll(&fds[0], len(fds), timeout, sigmask) 130 } 131 132 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) 133 134 func Readlink(path string, buf []byte) (n int, err error) { 135 return Readlinkat(AT_FDCWD, path, buf) 136 } 137 138 func Rename(oldpath string, newpath string) (err error) { 139 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) 140 } 141 142 func Rmdir(path string) error { 143 return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR) 144 } 145 146 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) 147 148 func Symlink(oldpath string, newpath string) (err error) { 149 return Symlinkat(oldpath, AT_FDCWD, newpath) 150 } 151 152 func Unlink(path string) error { 153 return Unlinkat(AT_FDCWD, path, 0) 154 } 155 156 //sys Unlinkat(dirfd int, path string, flags int) (err error) 157 158 //sys utimes(path string, times *[2]Timeval) (err error) 159 160 func Utimes(path string, tv []Timeval) error { 161 if tv == nil { 162 err := utimensat(AT_FDCWD, path, nil, 0) 163 if err != ENOSYS { 164 return err 165 } 166 return utimes(path, nil) 167 } 168 if len(tv) != 2 { 169 return EINVAL 170 } 171 var ts [2]Timespec 172 ts[0] = NsecToTimespec(TimevalToNsec(tv[0])) 173 ts[1] = NsecToTimespec(TimevalToNsec(tv[1])) 174 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 175 if err != ENOSYS { 176 return err 177 } 178 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 179 } 180 181 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) 182 183 func UtimesNano(path string, ts []Timespec) error { 184 if ts == nil { 185 err := utimensat(AT_FDCWD, path, nil, 0) 186 if err != ENOSYS { 187 return err 188 } 189 return utimes(path, nil) 190 } 191 if len(ts) != 2 { 192 return EINVAL 193 } 194 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) 195 if err != ENOSYS { 196 return err 197 } 198 // If the utimensat syscall isn't available (utimensat was added to Linux 199 // in 2.6.22, Released, 8 July 2007) then fall back to utimes 200 var tv [2]Timeval 201 for i := 0; i < 2; i++ { 202 tv[i] = NsecToTimeval(TimespecToNsec(ts[i])) 203 } 204 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 205 } 206 207 func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { 208 if ts == nil { 209 return utimensat(dirfd, path, nil, flags) 210 } 211 if len(ts) != 2 { 212 return EINVAL 213 } 214 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags) 215 } 216 217 //sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error) 218 219 func Futimesat(dirfd int, path string, tv []Timeval) error { 220 pathp, err := BytePtrFromString(path) 221 if err != nil { 222 return err 223 } 224 if tv == nil { 225 return futimesat(dirfd, pathp, nil) 226 } 227 if len(tv) != 2 { 228 return EINVAL 229 } 230 return futimesat(dirfd, pathp, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) 231 } 232 233 func Futimes(fd int, tv []Timeval) (err error) { 234 // Believe it or not, this is the best we can do on Linux 235 // (and is what glibc does). 236 return Utimes("/proc/self/fd/"+itoa(fd), tv) 237 } 238 239 const ImplementsGetwd = true 240 241 //sys Getcwd(buf []byte) (n int, err error) 242 243 func Getwd() (wd string, err error) { 244 var buf [PathMax]byte 245 n, err := Getcwd(buf[0:]) 246 if err != nil { 247 return "", err 248 } 249 // Getcwd returns the number of bytes written to buf, including the NUL. 250 if n < 1 || n > len(buf) || buf[n-1] != 0 { 251 return "", EINVAL 252 } 253 return string(buf[0 : n-1]), nil 254 } 255 256 func Getgroups() (gids []int, err error) { 257 n, err := getgroups(0, nil) 258 if err != nil { 259 return nil, err 260 } 261 if n == 0 { 262 return nil, nil 263 } 264 265 // Sanity check group count. Max is 1<<16 on Linux. 266 if n < 0 || n > 1<<20 { 267 return nil, EINVAL 268 } 269 270 a := make([]_Gid_t, n) 271 n, err = getgroups(n, &a[0]) 272 if err != nil { 273 return nil, err 274 } 275 gids = make([]int, n) 276 for i, v := range a[0:n] { 277 gids[i] = int(v) 278 } 279 return 280 } 281 282 func Setgroups(gids []int) (err error) { 283 if len(gids) == 0 { 284 return setgroups(0, nil) 285 } 286 287 a := make([]_Gid_t, len(gids)) 288 for i, v := range gids { 289 a[i] = _Gid_t(v) 290 } 291 return setgroups(len(a), &a[0]) 292 } 293 294 type WaitStatus uint32 295 296 // Wait status is 7 bits at bottom, either 0 (exited), 297 // 0x7F (stopped), or a signal number that caused an exit. 298 // The 0x80 bit is whether there was a core dump. 299 // An extra number (exit code, signal causing a stop) 300 // is in the high bits. At least that's the idea. 301 // There are various irregularities. For example, the 302 // "continued" status is 0xFFFF, distinguishing itself 303 // from stopped via the core dump bit. 304 305 const ( 306 mask = 0x7F 307 core = 0x80 308 exited = 0x00 309 stopped = 0x7F 310 shift = 8 311 ) 312 313 func (w WaitStatus) Exited() bool { return w&mask == exited } 314 315 func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } 316 317 func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } 318 319 func (w WaitStatus) Continued() bool { return w == 0xFFFF } 320 321 func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } 322 323 func (w WaitStatus) ExitStatus() int { 324 if !w.Exited() { 325 return -1 326 } 327 return int(w>>shift) & 0xFF 328 } 329 330 func (w WaitStatus) Signal() syscall.Signal { 331 if !w.Signaled() { 332 return -1 333 } 334 return syscall.Signal(w & mask) 335 } 336 337 func (w WaitStatus) StopSignal() syscall.Signal { 338 if !w.Stopped() { 339 return -1 340 } 341 return syscall.Signal(w>>shift) & 0xFF 342 } 343 344 func (w WaitStatus) TrapCause() int { 345 if w.StopSignal() != SIGTRAP { 346 return -1 347 } 348 return int(w>>shift) >> 8 349 } 350 351 //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) 352 353 func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) { 354 var status _C_int 355 wpid, err = wait4(pid, &status, options, rusage) 356 if wstatus != nil { 357 *wstatus = WaitStatus(status) 358 } 359 return 360 } 361 362 func Mkfifo(path string, mode uint32) error { 363 return Mknod(path, mode|S_IFIFO, 0) 364 } 365 366 func Mkfifoat(dirfd int, path string, mode uint32) error { 367 return Mknodat(dirfd, path, mode|S_IFIFO, 0) 368 } 369 370 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) { 371 if sa.Port < 0 || sa.Port > 0xFFFF { 372 return nil, 0, EINVAL 373 } 374 sa.raw.Family = AF_INET 375 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 376 p[0] = byte(sa.Port >> 8) 377 p[1] = byte(sa.Port) 378 for i := 0; i < len(sa.Addr); i++ { 379 sa.raw.Addr[i] = sa.Addr[i] 380 } 381 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil 382 } 383 384 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) { 385 if sa.Port < 0 || sa.Port > 0xFFFF { 386 return nil, 0, EINVAL 387 } 388 sa.raw.Family = AF_INET6 389 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 390 p[0] = byte(sa.Port >> 8) 391 p[1] = byte(sa.Port) 392 sa.raw.Scope_id = sa.ZoneId 393 for i := 0; i < len(sa.Addr); i++ { 394 sa.raw.Addr[i] = sa.Addr[i] 395 } 396 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil 397 } 398 399 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { 400 name := sa.Name 401 n := len(name) 402 if n >= len(sa.raw.Path) { 403 return nil, 0, EINVAL 404 } 405 sa.raw.Family = AF_UNIX 406 for i := 0; i < n; i++ { 407 sa.raw.Path[i] = int8(name[i]) 408 } 409 // length is family (uint16), name, NUL. 410 sl := _Socklen(2) 411 if n > 0 { 412 sl += _Socklen(n) + 1 413 } 414 if sa.raw.Path[0] == '@' { 415 sa.raw.Path[0] = 0 416 // Don't count trailing NUL for abstract address. 417 sl-- 418 } 419 420 return unsafe.Pointer(&sa.raw), sl, nil 421 } 422 423 type SockaddrLinklayer struct { 424 Protocol uint16 425 Ifindex int 426 Hatype uint16 427 Pkttype uint8 428 Halen uint8 429 Addr [8]byte 430 raw RawSockaddrLinklayer 431 } 432 433 func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { 434 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 435 return nil, 0, EINVAL 436 } 437 sa.raw.Family = AF_PACKET 438 sa.raw.Protocol = sa.Protocol 439 sa.raw.Ifindex = int32(sa.Ifindex) 440 sa.raw.Hatype = sa.Hatype 441 sa.raw.Pkttype = sa.Pkttype 442 sa.raw.Halen = sa.Halen 443 for i := 0; i < len(sa.Addr); i++ { 444 sa.raw.Addr[i] = sa.Addr[i] 445 } 446 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil 447 } 448 449 type SockaddrNetlink struct { 450 Family uint16 451 Pad uint16 452 Pid uint32 453 Groups uint32 454 raw RawSockaddrNetlink 455 } 456 457 func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 458 sa.raw.Family = AF_NETLINK 459 sa.raw.Pad = sa.Pad 460 sa.raw.Pid = sa.Pid 461 sa.raw.Groups = sa.Groups 462 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil 463 } 464 465 type SockaddrHCI struct { 466 Dev uint16 467 Channel uint16 468 raw RawSockaddrHCI 469 } 470 471 func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 472 sa.raw.Family = AF_BLUETOOTH 473 sa.raw.Dev = sa.Dev 474 sa.raw.Channel = sa.Channel 475 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil 476 } 477 478 // SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets. 479 // The RxID and TxID fields are used for transport protocol addressing in 480 // (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with 481 // zero values for CAN_RAW and CAN_BCM sockets as they have no meaning. 482 // 483 // The SockaddrCAN struct must be bound to the socket file descriptor 484 // using Bind before the CAN socket can be used. 485 // 486 // // Read one raw CAN frame 487 // fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW) 488 // addr := &SockaddrCAN{Ifindex: index} 489 // Bind(fd, addr) 490 // frame := make([]byte, 16) 491 // Read(fd, frame) 492 // 493 // The full SocketCAN documentation can be found in the linux kernel 494 // archives at: https://www.kernel.org/doc/Documentation/networking/can.txt 495 type SockaddrCAN struct { 496 Ifindex int 497 RxID uint32 498 TxID uint32 499 raw RawSockaddrCAN 500 } 501 502 func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { 503 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 504 return nil, 0, EINVAL 505 } 506 sa.raw.Family = AF_CAN 507 sa.raw.Ifindex = int32(sa.Ifindex) 508 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) 509 for i := 0; i < 4; i++ { 510 sa.raw.Addr[i] = rx[i] 511 } 512 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) 513 for i := 0; i < 4; i++ { 514 sa.raw.Addr[i+4] = tx[i] 515 } 516 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil 517 } 518 519 // SockaddrALG implements the Sockaddr interface for AF_ALG type sockets. 520 // SockaddrALG enables userspace access to the Linux kernel's cryptography 521 // subsystem. The Type and Name fields specify which type of hash or cipher 522 // should be used with a given socket. 523 // 524 // To create a file descriptor that provides access to a hash or cipher, both 525 // Bind and Accept must be used. Once the setup process is complete, input 526 // data can be written to the socket, processed by the kernel, and then read 527 // back as hash output or ciphertext. 528 // 529 // Here is an example of using an AF_ALG socket with SHA1 hashing. 530 // The initial socket setup process is as follows: 531 // 532 // // Open a socket to perform SHA1 hashing. 533 // fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0) 534 // addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"} 535 // unix.Bind(fd, addr) 536 // // Note: unix.Accept does not work at this time; must invoke accept() 537 // // manually using unix.Syscall. 538 // hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0) 539 // 540 // Once a file descriptor has been returned from Accept, it may be used to 541 // perform SHA1 hashing. The descriptor is not safe for concurrent use, but 542 // may be re-used repeatedly with subsequent Write and Read operations. 543 // 544 // When hashing a small byte slice or string, a single Write and Read may 545 // be used: 546 // 547 // // Assume hashfd is already configured using the setup process. 548 // hash := os.NewFile(hashfd, "sha1") 549 // // Hash an input string and read the results. Each Write discards 550 // // previous hash state. Read always reads the current state. 551 // b := make([]byte, 20) 552 // for i := 0; i < 2; i++ { 553 // io.WriteString(hash, "Hello, world.") 554 // hash.Read(b) 555 // fmt.Println(hex.EncodeToString(b)) 556 // } 557 // // Output: 558 // // 2ae01472317d1935a84797ec1983ae243fc6aa28 559 // // 2ae01472317d1935a84797ec1983ae243fc6aa28 560 // 561 // For hashing larger byte slices, or byte streams such as those read from 562 // a file or socket, use Sendto with MSG_MORE to instruct the kernel to update 563 // the hash digest instead of creating a new one for a given chunk and finalizing it. 564 // 565 // // Assume hashfd and addr are already configured using the setup process. 566 // hash := os.NewFile(hashfd, "sha1") 567 // // Hash the contents of a file. 568 // f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz") 569 // b := make([]byte, 4096) 570 // for { 571 // n, err := f.Read(b) 572 // if err == io.EOF { 573 // break 574 // } 575 // unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr) 576 // } 577 // hash.Read(b) 578 // fmt.Println(hex.EncodeToString(b)) 579 // // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5 580 // 581 // For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html. 582 type SockaddrALG struct { 583 Type string 584 Name string 585 Feature uint32 586 Mask uint32 587 raw RawSockaddrALG 588 } 589 590 func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) { 591 // Leave room for NUL byte terminator. 592 if len(sa.Type) > 13 { 593 return nil, 0, EINVAL 594 } 595 if len(sa.Name) > 63 { 596 return nil, 0, EINVAL 597 } 598 599 sa.raw.Family = AF_ALG 600 sa.raw.Feat = sa.Feature 601 sa.raw.Mask = sa.Mask 602 603 typ, err := ByteSliceFromString(sa.Type) 604 if err != nil { 605 return nil, 0, err 606 } 607 name, err := ByteSliceFromString(sa.Name) 608 if err != nil { 609 return nil, 0, err 610 } 611 612 copy(sa.raw.Type[:], typ) 613 copy(sa.raw.Name[:], name) 614 615 return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil 616 } 617 618 // SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets. 619 // SockaddrVM provides access to Linux VM sockets: a mechanism that enables 620 // bidirectional communication between a hypervisor and its guest virtual 621 // machines. 622 type SockaddrVM struct { 623 // CID and Port specify a context ID and port address for a VM socket. 624 // Guests have a unique CID, and hosts may have a well-known CID of: 625 // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. 626 // - VMADDR_CID_HOST: refers to other processes on the host. 627 CID uint32 628 Port uint32 629 raw RawSockaddrVM 630 } 631 632 func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { 633 sa.raw.Family = AF_VSOCK 634 sa.raw.Port = sa.Port 635 sa.raw.Cid = sa.CID 636 637 return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil 638 } 639 640 func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { 641 switch rsa.Addr.Family { 642 case AF_NETLINK: 643 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) 644 sa := new(SockaddrNetlink) 645 sa.Family = pp.Family 646 sa.Pad = pp.Pad 647 sa.Pid = pp.Pid 648 sa.Groups = pp.Groups 649 return sa, nil 650 651 case AF_PACKET: 652 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa)) 653 sa := new(SockaddrLinklayer) 654 sa.Protocol = pp.Protocol 655 sa.Ifindex = int(pp.Ifindex) 656 sa.Hatype = pp.Hatype 657 sa.Pkttype = pp.Pkttype 658 sa.Halen = pp.Halen 659 for i := 0; i < len(sa.Addr); i++ { 660 sa.Addr[i] = pp.Addr[i] 661 } 662 return sa, nil 663 664 case AF_UNIX: 665 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) 666 sa := new(SockaddrUnix) 667 if pp.Path[0] == 0 { 668 // "Abstract" Unix domain socket. 669 // Rewrite leading NUL as @ for textual display. 670 // (This is the standard convention.) 671 // Not friendly to overwrite in place, 672 // but the callers below don't care. 673 pp.Path[0] = '@' 674 } 675 676 // Assume path ends at NUL. 677 // This is not technically the Linux semantics for 678 // abstract Unix domain sockets--they are supposed 679 // to be uninterpreted fixed-size binary blobs--but 680 // everyone uses this convention. 681 n := 0 682 for n < len(pp.Path) && pp.Path[n] != 0 { 683 n++ 684 } 685 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] 686 sa.Name = string(bytes) 687 return sa, nil 688 689 case AF_INET: 690 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 691 sa := new(SockaddrInet4) 692 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 693 sa.Port = int(p[0])<<8 + int(p[1]) 694 for i := 0; i < len(sa.Addr); i++ { 695 sa.Addr[i] = pp.Addr[i] 696 } 697 return sa, nil 698 699 case AF_INET6: 700 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 701 sa := new(SockaddrInet6) 702 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 703 sa.Port = int(p[0])<<8 + int(p[1]) 704 sa.ZoneId = pp.Scope_id 705 for i := 0; i < len(sa.Addr); i++ { 706 sa.Addr[i] = pp.Addr[i] 707 } 708 return sa, nil 709 710 case AF_VSOCK: 711 pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) 712 sa := &SockaddrVM{ 713 CID: pp.Cid, 714 Port: pp.Port, 715 } 716 return sa, nil 717 } 718 return nil, EAFNOSUPPORT 719 } 720 721 func Accept(fd int) (nfd int, sa Sockaddr, err error) { 722 var rsa RawSockaddrAny 723 var len _Socklen = SizeofSockaddrAny 724 nfd, err = accept(fd, &rsa, &len) 725 if err != nil { 726 return 727 } 728 sa, err = anyToSockaddr(&rsa) 729 if err != nil { 730 Close(nfd) 731 nfd = 0 732 } 733 return 734 } 735 736 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { 737 var rsa RawSockaddrAny 738 var len _Socklen = SizeofSockaddrAny 739 nfd, err = accept4(fd, &rsa, &len, flags) 740 if err != nil { 741 return 742 } 743 if len > SizeofSockaddrAny { 744 panic("RawSockaddrAny too small") 745 } 746 sa, err = anyToSockaddr(&rsa) 747 if err != nil { 748 Close(nfd) 749 nfd = 0 750 } 751 return 752 } 753 754 func Getsockname(fd int) (sa Sockaddr, err error) { 755 var rsa RawSockaddrAny 756 var len _Socklen = SizeofSockaddrAny 757 if err = getsockname(fd, &rsa, &len); err != nil { 758 return 759 } 760 return anyToSockaddr(&rsa) 761 } 762 763 func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { 764 vallen := _Socklen(4) 765 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) 766 return value, err 767 } 768 769 func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { 770 var value IPMreq 771 vallen := _Socklen(SizeofIPMreq) 772 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 773 return &value, err 774 } 775 776 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 777 var value IPMreqn 778 vallen := _Socklen(SizeofIPMreqn) 779 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 780 return &value, err 781 } 782 783 func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { 784 var value IPv6Mreq 785 vallen := _Socklen(SizeofIPv6Mreq) 786 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 787 return &value, err 788 } 789 790 func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { 791 var value IPv6MTUInfo 792 vallen := _Socklen(SizeofIPv6MTUInfo) 793 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 794 return &value, err 795 } 796 797 func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { 798 var value ICMPv6Filter 799 vallen := _Socklen(SizeofICMPv6Filter) 800 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 801 return &value, err 802 } 803 804 func GetsockoptUcred(fd, level, opt int) (*Ucred, error) { 805 var value Ucred 806 vallen := _Socklen(SizeofUcred) 807 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 808 return &value, err 809 } 810 811 func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) { 812 var value TCPInfo 813 vallen := _Socklen(SizeofTCPInfo) 814 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 815 return &value, err 816 } 817 818 // GetsockoptString returns the string value of the socket option opt for the 819 // socket associated with fd at the given socket level. 820 func GetsockoptString(fd, level, opt int) (string, error) { 821 buf := make([]byte, 256) 822 vallen := _Socklen(len(buf)) 823 err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 824 if err != nil { 825 if err == ERANGE { 826 buf = make([]byte, vallen) 827 err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen) 828 } 829 if err != nil { 830 return "", err 831 } 832 } 833 return string(buf[:vallen-1]), nil 834 } 835 836 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 837 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 838 } 839 840 // Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html) 841 842 // KeyctlInt calls keyctl commands in which each argument is an int. 843 // These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK, 844 // KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT, 845 // KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT, 846 // KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT. 847 //sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL 848 849 // KeyctlBuffer calls keyctl commands in which the third and fourth 850 // arguments are a buffer and its length, respectively. 851 // These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE. 852 //sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL 853 854 // KeyctlString calls keyctl commands which return a string. 855 // These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY. 856 func KeyctlString(cmd int, id int) (string, error) { 857 // We must loop as the string data may change in between the syscalls. 858 // We could allocate a large buffer here to reduce the chance that the 859 // syscall needs to be called twice; however, this is unnecessary as 860 // the performance loss is negligible. 861 var buffer []byte 862 for { 863 // Try to fill the buffer with data 864 length, err := KeyctlBuffer(cmd, id, buffer, 0) 865 if err != nil { 866 return "", err 867 } 868 869 // Check if the data was written 870 if length <= len(buffer) { 871 // Exclude the null terminator 872 return string(buffer[:length-1]), nil 873 } 874 875 // Make a bigger buffer if needed 876 buffer = make([]byte, length) 877 } 878 } 879 880 // Keyctl commands with special signatures. 881 882 // KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command. 883 // See the full documentation at: 884 // http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html 885 func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) { 886 createInt := 0 887 if create { 888 createInt = 1 889 } 890 return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0) 891 } 892 893 // KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the 894 // key handle permission mask as described in the "keyctl setperm" section of 895 // http://man7.org/linux/man-pages/man1/keyctl.1.html. 896 // See the full documentation at: 897 // http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html 898 func KeyctlSetperm(id int, perm uint32) error { 899 _, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0) 900 return err 901 } 902 903 //sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL 904 905 // KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command. 906 // See the full documentation at: 907 // http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html 908 func KeyctlJoinSessionKeyring(name string) (ringid int, err error) { 909 return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name) 910 } 911 912 //sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL 913 914 // KeyctlSearch implements the KEYCTL_SEARCH command. 915 // See the full documentation at: 916 // http://man7.org/linux/man-pages/man3/keyctl_search.3.html 917 func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) { 918 return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid) 919 } 920 921 //sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL 922 923 // KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This 924 // command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice 925 // of Iovec (each of which represents a buffer) instead of a single buffer. 926 // See the full documentation at: 927 // http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html 928 func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error { 929 return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid) 930 } 931 932 //sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL 933 934 // KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command 935 // computes a Diffie-Hellman shared secret based on the provide params. The 936 // secret is written to the provided buffer and the returned size is the number 937 // of bytes written (returning an error if there is insufficient space in the 938 // buffer). If a nil buffer is passed in, this function returns the minimum 939 // buffer length needed to store the appropriate data. Note that this differs 940 // from KEYCTL_READ's behavior which always returns the requested payload size. 941 // See the full documentation at: 942 // http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html 943 func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) { 944 return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer) 945 } 946 947 func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { 948 var msg Msghdr 949 var rsa RawSockaddrAny 950 msg.Name = (*byte)(unsafe.Pointer(&rsa)) 951 msg.Namelen = uint32(SizeofSockaddrAny) 952 var iov Iovec 953 if len(p) > 0 { 954 iov.Base = &p[0] 955 iov.SetLen(len(p)) 956 } 957 var dummy byte 958 if len(oob) > 0 { 959 var sockType int 960 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 961 if err != nil { 962 return 963 } 964 // receive at least one normal byte 965 if sockType != SOCK_DGRAM && len(p) == 0 { 966 iov.Base = &dummy 967 iov.SetLen(1) 968 } 969 msg.Control = &oob[0] 970 msg.SetControllen(len(oob)) 971 } 972 msg.Iov = &iov 973 msg.Iovlen = 1 974 if n, err = recvmsg(fd, &msg, flags); err != nil { 975 return 976 } 977 oobn = int(msg.Controllen) 978 recvflags = int(msg.Flags) 979 // source address is only specified if the socket is unconnected 980 if rsa.Addr.Family != AF_UNSPEC { 981 from, err = anyToSockaddr(&rsa) 982 } 983 return 984 } 985 986 func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { 987 _, err = SendmsgN(fd, p, oob, to, flags) 988 return 989 } 990 991 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { 992 var ptr unsafe.Pointer 993 var salen _Socklen 994 if to != nil { 995 var err error 996 ptr, salen, err = to.sockaddr() 997 if err != nil { 998 return 0, err 999 } 1000 } 1001 var msg Msghdr 1002 msg.Name = (*byte)(ptr) 1003 msg.Namelen = uint32(salen) 1004 var iov Iovec 1005 if len(p) > 0 { 1006 iov.Base = &p[0] 1007 iov.SetLen(len(p)) 1008 } 1009 var dummy byte 1010 if len(oob) > 0 { 1011 var sockType int 1012 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 1013 if err != nil { 1014 return 0, err 1015 } 1016 // send at least one normal byte 1017 if sockType != SOCK_DGRAM && len(p) == 0 { 1018 iov.Base = &dummy 1019 iov.SetLen(1) 1020 } 1021 msg.Control = &oob[0] 1022 msg.SetControllen(len(oob)) 1023 } 1024 msg.Iov = &iov 1025 msg.Iovlen = 1 1026 if n, err = sendmsg(fd, &msg, flags); err != nil { 1027 return 0, err 1028 } 1029 if len(oob) > 0 && len(p) == 0 { 1030 n = 0 1031 } 1032 return n, nil 1033 } 1034 1035 // BindToDevice binds the socket associated with fd to device. 1036 func BindToDevice(fd int, device string) (err error) { 1037 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device) 1038 } 1039 1040 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 1041 1042 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) { 1043 // The peek requests are machine-size oriented, so we wrap it 1044 // to retrieve arbitrary-length data. 1045 1046 // The ptrace syscall differs from glibc's ptrace. 1047 // Peeks returns the word in *data, not as the return value. 1048 1049 var buf [sizeofPtr]byte 1050 1051 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned 1052 // access (PEEKUSER warns that it might), but if we don't 1053 // align our reads, we might straddle an unmapped page 1054 // boundary and not get the bytes leading up to the page 1055 // boundary. 1056 n := 0 1057 if addr%sizeofPtr != 0 { 1058 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1059 if err != nil { 1060 return 0, err 1061 } 1062 n += copy(out, buf[addr%sizeofPtr:]) 1063 out = out[n:] 1064 } 1065 1066 // Remainder. 1067 for len(out) > 0 { 1068 // We use an internal buffer to guarantee alignment. 1069 // It's not documented if this is necessary, but we're paranoid. 1070 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1071 if err != nil { 1072 return n, err 1073 } 1074 copied := copy(out, buf[0:]) 1075 n += copied 1076 out = out[copied:] 1077 } 1078 1079 return n, nil 1080 } 1081 1082 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) { 1083 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out) 1084 } 1085 1086 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) { 1087 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out) 1088 } 1089 1090 func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) { 1091 return ptracePeek(PTRACE_PEEKUSR, pid, addr, out) 1092 } 1093 1094 func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) { 1095 // As for ptracePeek, we need to align our accesses to deal 1096 // with the possibility of straddling an invalid page. 1097 1098 // Leading edge. 1099 n := 0 1100 if addr%sizeofPtr != 0 { 1101 var buf [sizeofPtr]byte 1102 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1103 if err != nil { 1104 return 0, err 1105 } 1106 n += copy(buf[addr%sizeofPtr:], data) 1107 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1108 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) 1109 if err != nil { 1110 return 0, err 1111 } 1112 data = data[n:] 1113 } 1114 1115 // Interior. 1116 for len(data) > sizeofPtr { 1117 word := *((*uintptr)(unsafe.Pointer(&data[0]))) 1118 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1119 if err != nil { 1120 return n, err 1121 } 1122 n += sizeofPtr 1123 data = data[sizeofPtr:] 1124 } 1125 1126 // Trailing edge. 1127 if len(data) > 0 { 1128 var buf [sizeofPtr]byte 1129 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1130 if err != nil { 1131 return n, err 1132 } 1133 copy(buf[0:], data) 1134 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1135 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1136 if err != nil { 1137 return n, err 1138 } 1139 n += len(data) 1140 } 1141 1142 return n, nil 1143 } 1144 1145 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) { 1146 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data) 1147 } 1148 1149 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) { 1150 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data) 1151 } 1152 1153 func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) { 1154 return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data) 1155 } 1156 1157 func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) { 1158 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout))) 1159 } 1160 1161 func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) { 1162 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs))) 1163 } 1164 1165 func PtraceSetOptions(pid int, options int) (err error) { 1166 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options)) 1167 } 1168 1169 func PtraceGetEventMsg(pid int) (msg uint, err error) { 1170 var data _C_long 1171 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data))) 1172 msg = uint(data) 1173 return 1174 } 1175 1176 func PtraceCont(pid int, signal int) (err error) { 1177 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal)) 1178 } 1179 1180 func PtraceSyscall(pid int, signal int) (err error) { 1181 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal)) 1182 } 1183 1184 func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } 1185 1186 func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } 1187 1188 func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } 1189 1190 //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) 1191 1192 func Reboot(cmd int) (err error) { 1193 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") 1194 } 1195 1196 func ReadDirent(fd int, buf []byte) (n int, err error) { 1197 return Getdents(fd, buf) 1198 } 1199 1200 func direntIno(buf []byte) (uint64, bool) { 1201 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 1202 } 1203 1204 func direntReclen(buf []byte) (uint64, bool) { 1205 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 1206 } 1207 1208 func direntNamlen(buf []byte) (uint64, bool) { 1209 reclen, ok := direntReclen(buf) 1210 if !ok { 1211 return 0, false 1212 } 1213 return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true 1214 } 1215 1216 //sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) 1217 1218 func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) { 1219 // Certain file systems get rather angry and EINVAL if you give 1220 // them an empty string of data, rather than NULL. 1221 if data == "" { 1222 return mount(source, target, fstype, flags, nil) 1223 } 1224 datap, err := BytePtrFromString(data) 1225 if err != nil { 1226 return err 1227 } 1228 return mount(source, target, fstype, flags, datap) 1229 } 1230 1231 // Sendto 1232 // Recvfrom 1233 // Socketpair 1234 1235 /* 1236 * Direct access 1237 */ 1238 //sys Acct(path string) (err error) 1239 //sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error) 1240 //sys Adjtimex(buf *Timex) (state int, err error) 1241 //sys Chdir(path string) (err error) 1242 //sys Chroot(path string) (err error) 1243 //sys ClockGettime(clockid int32, time *Timespec) (err error) 1244 //sys Close(fd int) (err error) 1245 //sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 1246 //sys Dup(oldfd int) (fd int, err error) 1247 //sys Dup3(oldfd int, newfd int, flags int) (err error) 1248 //sysnb EpollCreate(size int) (fd int, err error) 1249 //sysnb EpollCreate1(flag int) (fd int, err error) 1250 //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) 1251 //sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2 1252 //sys Exit(code int) = SYS_EXIT_GROUP 1253 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 1254 //sys Fallocate(fd int, mode uint32, off int64, len int64) (err error) 1255 //sys Fchdir(fd int) (err error) 1256 //sys Fchmod(fd int, mode uint32) (err error) 1257 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 1258 //sys fcntl(fd int, cmd int, arg int) (val int, err error) 1259 //sys Fdatasync(fd int) (err error) 1260 //sys Flock(fd int, how int) (err error) 1261 //sys Fsync(fd int) (err error) 1262 //sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64 1263 //sysnb Getpgid(pid int) (pgid int, err error) 1264 1265 func Getpgrp() (pid int) { 1266 pid, _ = Getpgid(0) 1267 return 1268 } 1269 1270 //sysnb Getpid() (pid int) 1271 //sysnb Getppid() (ppid int) 1272 //sys Getpriority(which int, who int) (prio int, err error) 1273 //sys Getrandom(buf []byte, flags int) (n int, err error) 1274 //sysnb Getrusage(who int, rusage *Rusage) (err error) 1275 //sysnb Getsid(pid int) (sid int, err error) 1276 //sysnb Gettid() (tid int) 1277 //sys Getxattr(path string, attr string, dest []byte) (sz int, err error) 1278 //sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) 1279 //sysnb InotifyInit1(flags int) (fd int, err error) 1280 //sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) 1281 //sysnb Kill(pid int, sig syscall.Signal) (err error) 1282 //sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG 1283 //sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error) 1284 //sys Listxattr(path string, dest []byte) (sz int, err error) 1285 //sys Llistxattr(path string, dest []byte) (sz int, err error) 1286 //sys Lremovexattr(path string, attr string) (err error) 1287 //sys Lsetxattr(path string, attr string, data []byte, flags int) (err error) 1288 //sys Mkdirat(dirfd int, path string, mode uint32) (err error) 1289 //sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error) 1290 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 1291 //sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT 1292 //sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 1293 //sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) 1294 //sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6 1295 //sys read(fd int, p []byte) (n int, err error) 1296 //sys Removexattr(path string, attr string) (err error) 1297 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 1298 //sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error) 1299 //sys Setdomainname(p []byte) (err error) 1300 //sys Sethostname(p []byte) (err error) 1301 //sysnb Setpgid(pid int, pgid int) (err error) 1302 //sysnb Setsid() (pid int, err error) 1303 //sysnb Settimeofday(tv *Timeval) (err error) 1304 //sys Setns(fd int, nstype int) (err error) 1305 1306 // issue 1435. 1307 // On linux Setuid and Setgid only affects the current thread, not the process. 1308 // This does not match what most callers expect so we must return an error 1309 // here rather than letting the caller think that the call succeeded. 1310 1311 func Setuid(uid int) (err error) { 1312 return EOPNOTSUPP 1313 } 1314 1315 func Setgid(uid int) (err error) { 1316 return EOPNOTSUPP 1317 } 1318 1319 //sys Setpriority(which int, who int, prio int) (err error) 1320 //sys Setxattr(path string, attr string, data []byte, flags int) (err error) 1321 //sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error) 1322 //sys Sync() 1323 //sys Syncfs(fd int) (err error) 1324 //sysnb Sysinfo(info *Sysinfo_t) (err error) 1325 //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) 1326 //sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) 1327 //sysnb Times(tms *Tms) (ticks uintptr, err error) 1328 //sysnb Umask(mask int) (oldmask int) 1329 //sysnb Uname(buf *Utsname) (err error) 1330 //sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2 1331 //sys Unshare(flags int) (err error) 1332 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 1333 //sys write(fd int, p []byte) (n int, err error) 1334 //sys exitThread(code int) (err error) = SYS_EXIT 1335 //sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ 1336 //sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE 1337 1338 // mmap varies by architecture; see syscall_linux_*.go. 1339 //sys munmap(addr uintptr, length uintptr) (err error) 1340 1341 var mapper = &mmapper{ 1342 active: make(map[*byte][]byte), 1343 mmap: mmap, 1344 munmap: munmap, 1345 } 1346 1347 func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { 1348 return mapper.Mmap(fd, offset, length, prot, flags) 1349 } 1350 1351 func Munmap(b []byte) (err error) { 1352 return mapper.Munmap(b) 1353 } 1354 1355 //sys Madvise(b []byte, advice int) (err error) 1356 //sys Mprotect(b []byte, prot int) (err error) 1357 //sys Mlock(b []byte) (err error) 1358 //sys Mlockall(flags int) (err error) 1359 //sys Msync(b []byte, flags int) (err error) 1360 //sys Munlock(b []byte) (err error) 1361 //sys Munlockall() (err error) 1362 1363 // Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd, 1364 // using the specified flags. 1365 func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { 1366 n, _, errno := Syscall6( 1367 SYS_VMSPLICE, 1368 uintptr(fd), 1369 uintptr(unsafe.Pointer(&iovs[0])), 1370 uintptr(len(iovs)), 1371 uintptr(flags), 1372 0, 1373 0, 1374 ) 1375 if errno != 0 { 1376 return 0, syscall.Errno(errno) 1377 } 1378 1379 return int(n), nil 1380 } 1381 1382 /* 1383 * Unimplemented 1384 */ 1385 // AfsSyscall 1386 // Alarm 1387 // ArchPrctl 1388 // Brk 1389 // Capget 1390 // Capset 1391 // ClockGetres 1392 // ClockNanosleep 1393 // ClockSettime 1394 // Clone 1395 // CreateModule 1396 // DeleteModule 1397 // EpollCtlOld 1398 // EpollPwait 1399 // EpollWaitOld 1400 // Execve 1401 // Fgetxattr 1402 // Flistxattr 1403 // Fork 1404 // Fremovexattr 1405 // Fsetxattr 1406 // Futex 1407 // GetKernelSyms 1408 // GetMempolicy 1409 // GetRobustList 1410 // GetThreadArea 1411 // Getitimer 1412 // Getpmsg 1413 // IoCancel 1414 // IoDestroy 1415 // IoGetevents 1416 // IoSetup 1417 // IoSubmit 1418 // IoprioGet 1419 // IoprioSet 1420 // KexecLoad 1421 // LookupDcookie 1422 // Mbind 1423 // MigratePages 1424 // Mincore 1425 // ModifyLdt 1426 // Mount 1427 // MovePages 1428 // MqGetsetattr 1429 // MqNotify 1430 // MqOpen 1431 // MqTimedreceive 1432 // MqTimedsend 1433 // MqUnlink 1434 // Mremap 1435 // Msgctl 1436 // Msgget 1437 // Msgrcv 1438 // Msgsnd 1439 // Nfsservctl 1440 // Personality 1441 // Pselect6 1442 // Ptrace 1443 // Putpmsg 1444 // QueryModule 1445 // Quotactl 1446 // Readahead 1447 // Readv 1448 // RemapFilePages 1449 // RestartSyscall 1450 // RtSigaction 1451 // RtSigpending 1452 // RtSigprocmask 1453 // RtSigqueueinfo 1454 // RtSigreturn 1455 // RtSigsuspend 1456 // RtSigtimedwait 1457 // SchedGetPriorityMax 1458 // SchedGetPriorityMin 1459 // SchedGetparam 1460 // SchedGetscheduler 1461 // SchedRrGetInterval 1462 // SchedSetparam 1463 // SchedYield 1464 // Security 1465 // Semctl 1466 // Semget 1467 // Semop 1468 // Semtimedop 1469 // SetMempolicy 1470 // SetRobustList 1471 // SetThreadArea 1472 // SetTidAddress 1473 // Shmat 1474 // Shmctl 1475 // Shmdt 1476 // Shmget 1477 // Sigaltstack 1478 // Signalfd 1479 // Swapoff 1480 // Swapon 1481 // Sysfs 1482 // TimerCreate 1483 // TimerDelete 1484 // TimerGetoverrun 1485 // TimerGettime 1486 // TimerSettime 1487 // Timerfd 1488 // Tkill (obsolete) 1489 // Tuxcall 1490 // Umount2 1491 // Uselib 1492 // Utimensat 1493 // Vfork 1494 // Vhangup 1495 // Vserver 1496 // Waitid 1497 // _Sysctl