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 12package unix 13 14import ( 15 "syscall" 16 "unsafe" 17) 18 19/* 20 * Wrapped 21 */ 22 23func Access(path string, mode uint32) (err error) { 24 return Faccessat(AT_FDCWD, path, mode, 0) 25} 26 27func Chmod(path string, mode uint32) (err error) { 28 return Fchmodat(AT_FDCWD, path, mode, 0) 29} 30 31func Chown(path string, uid int, gid int) (err error) { 32 return Fchownat(AT_FDCWD, path, uid, gid, 0) 33} 34 35func 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 41func 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. 60func IoctlSetInt(fd int, req uint, value int) error { 61 return ioctl(fd, req, uintptr(value)) 62} 63 64func IoctlSetWinsize(fd int, req uint, value *Winsize) error { 65 return ioctl(fd, req, uintptr(unsafe.Pointer(value))) 66} 67 68func 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. 74func 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 80func 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 86func 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 94func Link(oldpath string, newpath string) (err error) { 95 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) 96} 97 98func Mkdir(path string, mode uint32) (err error) { 99 return Mkdirat(AT_FDCWD, path, mode) 100} 101 102func Mknod(path string, mode uint32, dev int) (err error) { 103 return Mknodat(AT_FDCWD, path, mode, dev) 104} 105 106func 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 112func 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 118func 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 127func Readlink(path string, buf []byte) (n int, err error) { 128 return Readlinkat(AT_FDCWD, path, buf) 129} 130 131func Rename(oldpath string, newpath string) (err error) { 132 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) 133} 134 135func 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 141func Symlink(oldpath string, newpath string) (err error) { 142 return Symlinkat(oldpath, AT_FDCWD, newpath) 143} 144 145func 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 153func 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 176func 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 200func 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 212func 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 226func 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 232const ImplementsGetwd = true 233 234//sys Getcwd(buf []byte) (n int, err error) 235 236func 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 249func 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 275func 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 287type 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 298const ( 299 mask = 0x7F 300 core = 0x80 301 exited = 0x00 302 stopped = 0x7F 303 shift = 8 304) 305 306func (w WaitStatus) Exited() bool { return w&mask == exited } 307 308func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } 309 310func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } 311 312func (w WaitStatus) Continued() bool { return w == 0xFFFF } 313 314func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } 315 316func (w WaitStatus) ExitStatus() int { 317 if !w.Exited() { 318 return -1 319 } 320 return int(w>>shift) & 0xFF 321} 322 323func (w WaitStatus) Signal() syscall.Signal { 324 if !w.Signaled() { 325 return -1 326 } 327 return syscall.Signal(w & mask) 328} 329 330func (w WaitStatus) StopSignal() syscall.Signal { 331 if !w.Stopped() { 332 return -1 333 } 334 return syscall.Signal(w>>shift) & 0xFF 335} 336 337func (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 346func 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 355func Mkfifo(path string, mode uint32) error { 356 return Mknod(path, mode|S_IFIFO, 0) 357} 358 359func Mkfifoat(dirfd int, path string, mode uint32) error { 360 return Mknodat(dirfd, path, mode|S_IFIFO, 0) 361} 362 363func (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 377func (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 392func (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 416type SockaddrLinklayer struct { 417 Protocol uint16 418 Ifindex int 419 Hatype uint16 420 Pkttype uint8 421 Halen uint8 422 Addr [8]byte 423 raw RawSockaddrLinklayer 424} 425 426func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { 427 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 428 return nil, 0, EINVAL 429 } 430 sa.raw.Family = AF_PACKET 431 sa.raw.Protocol = sa.Protocol 432 sa.raw.Ifindex = int32(sa.Ifindex) 433 sa.raw.Hatype = sa.Hatype 434 sa.raw.Pkttype = sa.Pkttype 435 sa.raw.Halen = sa.Halen 436 for i := 0; i < len(sa.Addr); i++ { 437 sa.raw.Addr[i] = sa.Addr[i] 438 } 439 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil 440} 441 442type SockaddrNetlink struct { 443 Family uint16 444 Pad uint16 445 Pid uint32 446 Groups uint32 447 raw RawSockaddrNetlink 448} 449 450func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 451 sa.raw.Family = AF_NETLINK 452 sa.raw.Pad = sa.Pad 453 sa.raw.Pid = sa.Pid 454 sa.raw.Groups = sa.Groups 455 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil 456} 457 458type SockaddrHCI struct { 459 Dev uint16 460 Channel uint16 461 raw RawSockaddrHCI 462} 463 464func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 465 sa.raw.Family = AF_BLUETOOTH 466 sa.raw.Dev = sa.Dev 467 sa.raw.Channel = sa.Channel 468 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil 469} 470 471// SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets. 472// The RxID and TxID fields are used for transport protocol addressing in 473// (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with 474// zero values for CAN_RAW and CAN_BCM sockets as they have no meaning. 475// 476// The SockaddrCAN struct must be bound to the socket file descriptor 477// using Bind before the CAN socket can be used. 478// 479// // Read one raw CAN frame 480// fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW) 481// addr := &SockaddrCAN{Ifindex: index} 482// Bind(fd, addr) 483// frame := make([]byte, 16) 484// Read(fd, frame) 485// 486// The full SocketCAN documentation can be found in the linux kernel 487// archives at: https://www.kernel.org/doc/Documentation/networking/can.txt 488type SockaddrCAN struct { 489 Ifindex int 490 RxID uint32 491 TxID uint32 492 raw RawSockaddrCAN 493} 494 495func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { 496 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { 497 return nil, 0, EINVAL 498 } 499 sa.raw.Family = AF_CAN 500 sa.raw.Ifindex = int32(sa.Ifindex) 501 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) 502 for i := 0; i < 4; i++ { 503 sa.raw.Addr[i] = rx[i] 504 } 505 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) 506 for i := 0; i < 4; i++ { 507 sa.raw.Addr[i+4] = tx[i] 508 } 509 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil 510} 511 512// SockaddrALG implements the Sockaddr interface for AF_ALG type sockets. 513// SockaddrALG enables userspace access to the Linux kernel's cryptography 514// subsystem. The Type and Name fields specify which type of hash or cipher 515// should be used with a given socket. 516// 517// To create a file descriptor that provides access to a hash or cipher, both 518// Bind and Accept must be used. Once the setup process is complete, input 519// data can be written to the socket, processed by the kernel, and then read 520// back as hash output or ciphertext. 521// 522// Here is an example of using an AF_ALG socket with SHA1 hashing. 523// The initial socket setup process is as follows: 524// 525// // Open a socket to perform SHA1 hashing. 526// fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0) 527// addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"} 528// unix.Bind(fd, addr) 529// // Note: unix.Accept does not work at this time; must invoke accept() 530// // manually using unix.Syscall. 531// hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0) 532// 533// Once a file descriptor has been returned from Accept, it may be used to 534// perform SHA1 hashing. The descriptor is not safe for concurrent use, but 535// may be re-used repeatedly with subsequent Write and Read operations. 536// 537// When hashing a small byte slice or string, a single Write and Read may 538// be used: 539// 540// // Assume hashfd is already configured using the setup process. 541// hash := os.NewFile(hashfd, "sha1") 542// // Hash an input string and read the results. Each Write discards 543// // previous hash state. Read always reads the current state. 544// b := make([]byte, 20) 545// for i := 0; i < 2; i++ { 546// io.WriteString(hash, "Hello, world.") 547// hash.Read(b) 548// fmt.Println(hex.EncodeToString(b)) 549// } 550// // Output: 551// // 2ae01472317d1935a84797ec1983ae243fc6aa28 552// // 2ae01472317d1935a84797ec1983ae243fc6aa28 553// 554// For hashing larger byte slices, or byte streams such as those read from 555// a file or socket, use Sendto with MSG_MORE to instruct the kernel to update 556// the hash digest instead of creating a new one for a given chunk and finalizing it. 557// 558// // Assume hashfd and addr are already configured using the setup process. 559// hash := os.NewFile(hashfd, "sha1") 560// // Hash the contents of a file. 561// f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz") 562// b := make([]byte, 4096) 563// for { 564// n, err := f.Read(b) 565// if err == io.EOF { 566// break 567// } 568// unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr) 569// } 570// hash.Read(b) 571// fmt.Println(hex.EncodeToString(b)) 572// // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5 573// 574// For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html. 575type SockaddrALG struct { 576 Type string 577 Name string 578 Feature uint32 579 Mask uint32 580 raw RawSockaddrALG 581} 582 583func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) { 584 // Leave room for NUL byte terminator. 585 if len(sa.Type) > 13 { 586 return nil, 0, EINVAL 587 } 588 if len(sa.Name) > 63 { 589 return nil, 0, EINVAL 590 } 591 592 sa.raw.Family = AF_ALG 593 sa.raw.Feat = sa.Feature 594 sa.raw.Mask = sa.Mask 595 596 typ, err := ByteSliceFromString(sa.Type) 597 if err != nil { 598 return nil, 0, err 599 } 600 name, err := ByteSliceFromString(sa.Name) 601 if err != nil { 602 return nil, 0, err 603 } 604 605 copy(sa.raw.Type[:], typ) 606 copy(sa.raw.Name[:], name) 607 608 return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil 609} 610 611// SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets. 612// SockaddrVM provides access to Linux VM sockets: a mechanism that enables 613// bidirectional communication between a hypervisor and its guest virtual 614// machines. 615type SockaddrVM struct { 616 // CID and Port specify a context ID and port address for a VM socket. 617 // Guests have a unique CID, and hosts may have a well-known CID of: 618 // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. 619 // - VMADDR_CID_HOST: refers to other processes on the host. 620 CID uint32 621 Port uint32 622 raw RawSockaddrVM 623} 624 625func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { 626 sa.raw.Family = AF_VSOCK 627 sa.raw.Port = sa.Port 628 sa.raw.Cid = sa.CID 629 630 return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil 631} 632 633func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { 634 switch rsa.Addr.Family { 635 case AF_NETLINK: 636 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) 637 sa := new(SockaddrNetlink) 638 sa.Family = pp.Family 639 sa.Pad = pp.Pad 640 sa.Pid = pp.Pid 641 sa.Groups = pp.Groups 642 return sa, nil 643 644 case AF_PACKET: 645 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa)) 646 sa := new(SockaddrLinklayer) 647 sa.Protocol = pp.Protocol 648 sa.Ifindex = int(pp.Ifindex) 649 sa.Hatype = pp.Hatype 650 sa.Pkttype = pp.Pkttype 651 sa.Halen = pp.Halen 652 for i := 0; i < len(sa.Addr); i++ { 653 sa.Addr[i] = pp.Addr[i] 654 } 655 return sa, nil 656 657 case AF_UNIX: 658 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) 659 sa := new(SockaddrUnix) 660 if pp.Path[0] == 0 { 661 // "Abstract" Unix domain socket. 662 // Rewrite leading NUL as @ for textual display. 663 // (This is the standard convention.) 664 // Not friendly to overwrite in place, 665 // but the callers below don't care. 666 pp.Path[0] = '@' 667 } 668 669 // Assume path ends at NUL. 670 // This is not technically the Linux semantics for 671 // abstract Unix domain sockets--they are supposed 672 // to be uninterpreted fixed-size binary blobs--but 673 // everyone uses this convention. 674 n := 0 675 for n < len(pp.Path) && pp.Path[n] != 0 { 676 n++ 677 } 678 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] 679 sa.Name = string(bytes) 680 return sa, nil 681 682 case AF_INET: 683 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 684 sa := new(SockaddrInet4) 685 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 686 sa.Port = int(p[0])<<8 + int(p[1]) 687 for i := 0; i < len(sa.Addr); i++ { 688 sa.Addr[i] = pp.Addr[i] 689 } 690 return sa, nil 691 692 case AF_INET6: 693 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 694 sa := new(SockaddrInet6) 695 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 696 sa.Port = int(p[0])<<8 + int(p[1]) 697 sa.ZoneId = pp.Scope_id 698 for i := 0; i < len(sa.Addr); i++ { 699 sa.Addr[i] = pp.Addr[i] 700 } 701 return sa, nil 702 703 case AF_VSOCK: 704 pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) 705 sa := &SockaddrVM{ 706 CID: pp.Cid, 707 Port: pp.Port, 708 } 709 return sa, nil 710 } 711 return nil, EAFNOSUPPORT 712} 713 714func Accept(fd int) (nfd int, sa Sockaddr, err error) { 715 var rsa RawSockaddrAny 716 var len _Socklen = SizeofSockaddrAny 717 nfd, err = accept(fd, &rsa, &len) 718 if err != nil { 719 return 720 } 721 sa, err = anyToSockaddr(&rsa) 722 if err != nil { 723 Close(nfd) 724 nfd = 0 725 } 726 return 727} 728 729func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { 730 var rsa RawSockaddrAny 731 var len _Socklen = SizeofSockaddrAny 732 nfd, err = accept4(fd, &rsa, &len, flags) 733 if err != nil { 734 return 735 } 736 if len > SizeofSockaddrAny { 737 panic("RawSockaddrAny too small") 738 } 739 sa, err = anyToSockaddr(&rsa) 740 if err != nil { 741 Close(nfd) 742 nfd = 0 743 } 744 return 745} 746 747func Getsockname(fd int) (sa Sockaddr, err error) { 748 var rsa RawSockaddrAny 749 var len _Socklen = SizeofSockaddrAny 750 if err = getsockname(fd, &rsa, &len); err != nil { 751 return 752 } 753 return anyToSockaddr(&rsa) 754} 755 756func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { 757 vallen := _Socklen(4) 758 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) 759 return value, err 760} 761 762func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { 763 var value IPMreq 764 vallen := _Socklen(SizeofIPMreq) 765 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 766 return &value, err 767} 768 769func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 770 var value IPMreqn 771 vallen := _Socklen(SizeofIPMreqn) 772 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 773 return &value, err 774} 775 776func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { 777 var value IPv6Mreq 778 vallen := _Socklen(SizeofIPv6Mreq) 779 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 780 return &value, err 781} 782 783func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { 784 var value IPv6MTUInfo 785 vallen := _Socklen(SizeofIPv6MTUInfo) 786 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 787 return &value, err 788} 789 790func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { 791 var value ICMPv6Filter 792 vallen := _Socklen(SizeofICMPv6Filter) 793 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 794 return &value, err 795} 796 797func GetsockoptUcred(fd, level, opt int) (*Ucred, error) { 798 var value Ucred 799 vallen := _Socklen(SizeofUcred) 800 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 801 return &value, err 802} 803 804func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) { 805 var value TCPInfo 806 vallen := _Socklen(SizeofTCPInfo) 807 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 808 return &value, err 809} 810 811func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 812 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 813} 814 815// Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html) 816 817// KeyctlInt calls keyctl commands in which each argument is an int. 818// These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK, 819// KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT, 820// KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT, 821// KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT. 822//sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL 823 824// KeyctlBuffer calls keyctl commands in which the third and fourth 825// arguments are a buffer and its length, respectively. 826// These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE. 827//sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL 828 829// KeyctlString calls keyctl commands which return a string. 830// These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY. 831func KeyctlString(cmd int, id int) (string, error) { 832 // We must loop as the string data may change in between the syscalls. 833 // We could allocate a large buffer here to reduce the chance that the 834 // syscall needs to be called twice; however, this is unnecessary as 835 // the performance loss is negligible. 836 var buffer []byte 837 for { 838 // Try to fill the buffer with data 839 length, err := KeyctlBuffer(cmd, id, buffer, 0) 840 if err != nil { 841 return "", err 842 } 843 844 // Check if the data was written 845 if length <= len(buffer) { 846 // Exclude the null terminator 847 return string(buffer[:length-1]), nil 848 } 849 850 // Make a bigger buffer if needed 851 buffer = make([]byte, length) 852 } 853} 854 855// Keyctl commands with special signatures. 856 857// KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command. 858// See the full documentation at: 859// http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html 860func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) { 861 createInt := 0 862 if create { 863 createInt = 1 864 } 865 return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0) 866} 867 868// KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the 869// key handle permission mask as described in the "keyctl setperm" section of 870// http://man7.org/linux/man-pages/man1/keyctl.1.html. 871// See the full documentation at: 872// http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html 873func KeyctlSetperm(id int, perm uint32) error { 874 _, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0) 875 return err 876} 877 878//sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL 879 880// KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command. 881// See the full documentation at: 882// http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html 883func KeyctlJoinSessionKeyring(name string) (ringid int, err error) { 884 return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name) 885} 886 887//sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL 888 889// KeyctlSearch implements the KEYCTL_SEARCH command. 890// See the full documentation at: 891// http://man7.org/linux/man-pages/man3/keyctl_search.3.html 892func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) { 893 return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid) 894} 895 896//sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL 897 898// KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This 899// command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice 900// of Iovec (each of which represents a buffer) instead of a single buffer. 901// See the full documentation at: 902// http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html 903func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error { 904 return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid) 905} 906 907//sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL 908 909// KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command 910// computes a Diffie-Hellman shared secret based on the provide params. The 911// secret is written to the provided buffer and the returned size is the number 912// of bytes written (returning an error if there is insufficient space in the 913// buffer). If a nil buffer is passed in, this function returns the minimum 914// buffer length needed to store the appropriate data. Note that this differs 915// from KEYCTL_READ's behavior which always returns the requested payload size. 916// See the full documentation at: 917// http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html 918func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) { 919 return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer) 920} 921 922func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { 923 var msg Msghdr 924 var rsa RawSockaddrAny 925 msg.Name = (*byte)(unsafe.Pointer(&rsa)) 926 msg.Namelen = uint32(SizeofSockaddrAny) 927 var iov Iovec 928 if len(p) > 0 { 929 iov.Base = &p[0] 930 iov.SetLen(len(p)) 931 } 932 var dummy byte 933 if len(oob) > 0 { 934 var sockType int 935 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 936 if err != nil { 937 return 938 } 939 // receive at least one normal byte 940 if sockType != SOCK_DGRAM && len(p) == 0 { 941 iov.Base = &dummy 942 iov.SetLen(1) 943 } 944 msg.Control = &oob[0] 945 msg.SetControllen(len(oob)) 946 } 947 msg.Iov = &iov 948 msg.Iovlen = 1 949 if n, err = recvmsg(fd, &msg, flags); err != nil { 950 return 951 } 952 oobn = int(msg.Controllen) 953 recvflags = int(msg.Flags) 954 // source address is only specified if the socket is unconnected 955 if rsa.Addr.Family != AF_UNSPEC { 956 from, err = anyToSockaddr(&rsa) 957 } 958 return 959} 960 961func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { 962 _, err = SendmsgN(fd, p, oob, to, flags) 963 return 964} 965 966func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { 967 var ptr unsafe.Pointer 968 var salen _Socklen 969 if to != nil { 970 var err error 971 ptr, salen, err = to.sockaddr() 972 if err != nil { 973 return 0, err 974 } 975 } 976 var msg Msghdr 977 msg.Name = (*byte)(ptr) 978 msg.Namelen = uint32(salen) 979 var iov Iovec 980 if len(p) > 0 { 981 iov.Base = &p[0] 982 iov.SetLen(len(p)) 983 } 984 var dummy byte 985 if len(oob) > 0 { 986 var sockType int 987 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE) 988 if err != nil { 989 return 0, err 990 } 991 // send at least one normal byte 992 if sockType != SOCK_DGRAM && len(p) == 0 { 993 iov.Base = &dummy 994 iov.SetLen(1) 995 } 996 msg.Control = &oob[0] 997 msg.SetControllen(len(oob)) 998 } 999 msg.Iov = &iov 1000 msg.Iovlen = 1 1001 if n, err = sendmsg(fd, &msg, flags); err != nil { 1002 return 0, err 1003 } 1004 if len(oob) > 0 && len(p) == 0 { 1005 n = 0 1006 } 1007 return n, nil 1008} 1009 1010// BindToDevice binds the socket associated with fd to device. 1011func BindToDevice(fd int, device string) (err error) { 1012 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device) 1013} 1014 1015//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error) 1016 1017func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) { 1018 // The peek requests are machine-size oriented, so we wrap it 1019 // to retrieve arbitrary-length data. 1020 1021 // The ptrace syscall differs from glibc's ptrace. 1022 // Peeks returns the word in *data, not as the return value. 1023 1024 var buf [sizeofPtr]byte 1025 1026 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned 1027 // access (PEEKUSER warns that it might), but if we don't 1028 // align our reads, we might straddle an unmapped page 1029 // boundary and not get the bytes leading up to the page 1030 // boundary. 1031 n := 0 1032 if addr%sizeofPtr != 0 { 1033 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1034 if err != nil { 1035 return 0, err 1036 } 1037 n += copy(out, buf[addr%sizeofPtr:]) 1038 out = out[n:] 1039 } 1040 1041 // Remainder. 1042 for len(out) > 0 { 1043 // We use an internal buffer to guarantee alignment. 1044 // It's not documented if this is necessary, but we're paranoid. 1045 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1046 if err != nil { 1047 return n, err 1048 } 1049 copied := copy(out, buf[0:]) 1050 n += copied 1051 out = out[copied:] 1052 } 1053 1054 return n, nil 1055} 1056 1057func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) { 1058 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out) 1059} 1060 1061func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) { 1062 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out) 1063} 1064 1065func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) { 1066 return ptracePeek(PTRACE_PEEKUSR, pid, addr, out) 1067} 1068 1069func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) { 1070 // As for ptracePeek, we need to align our accesses to deal 1071 // with the possibility of straddling an invalid page. 1072 1073 // Leading edge. 1074 n := 0 1075 if addr%sizeofPtr != 0 { 1076 var buf [sizeofPtr]byte 1077 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0]))) 1078 if err != nil { 1079 return 0, err 1080 } 1081 n += copy(buf[addr%sizeofPtr:], data) 1082 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1083 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) 1084 if err != nil { 1085 return 0, err 1086 } 1087 data = data[n:] 1088 } 1089 1090 // Interior. 1091 for len(data) > sizeofPtr { 1092 word := *((*uintptr)(unsafe.Pointer(&data[0]))) 1093 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1094 if err != nil { 1095 return n, err 1096 } 1097 n += sizeofPtr 1098 data = data[sizeofPtr:] 1099 } 1100 1101 // Trailing edge. 1102 if len(data) > 0 { 1103 var buf [sizeofPtr]byte 1104 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) 1105 if err != nil { 1106 return n, err 1107 } 1108 copy(buf[0:], data) 1109 word := *((*uintptr)(unsafe.Pointer(&buf[0]))) 1110 err = ptrace(pokeReq, pid, addr+uintptr(n), word) 1111 if err != nil { 1112 return n, err 1113 } 1114 n += len(data) 1115 } 1116 1117 return n, nil 1118} 1119 1120func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) { 1121 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data) 1122} 1123 1124func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) { 1125 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data) 1126} 1127 1128func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) { 1129 return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data) 1130} 1131 1132func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) { 1133 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout))) 1134} 1135 1136func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) { 1137 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs))) 1138} 1139 1140func PtraceSetOptions(pid int, options int) (err error) { 1141 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options)) 1142} 1143 1144func PtraceGetEventMsg(pid int) (msg uint, err error) { 1145 var data _C_long 1146 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data))) 1147 msg = uint(data) 1148 return 1149} 1150 1151func PtraceCont(pid int, signal int) (err error) { 1152 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal)) 1153} 1154 1155func PtraceSyscall(pid int, signal int) (err error) { 1156 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal)) 1157} 1158 1159func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } 1160 1161func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } 1162 1163func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } 1164 1165//sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) 1166 1167func Reboot(cmd int) (err error) { 1168 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") 1169} 1170 1171func ReadDirent(fd int, buf []byte) (n int, err error) { 1172 return Getdents(fd, buf) 1173} 1174 1175func direntIno(buf []byte) (uint64, bool) { 1176 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 1177} 1178 1179func direntReclen(buf []byte) (uint64, bool) { 1180 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 1181} 1182 1183func direntNamlen(buf []byte) (uint64, bool) { 1184 reclen, ok := direntReclen(buf) 1185 if !ok { 1186 return 0, false 1187 } 1188 return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true 1189} 1190 1191//sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) 1192 1193func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) { 1194 // Certain file systems get rather angry and EINVAL if you give 1195 // them an empty string of data, rather than NULL. 1196 if data == "" { 1197 return mount(source, target, fstype, flags, nil) 1198 } 1199 datap, err := BytePtrFromString(data) 1200 if err != nil { 1201 return err 1202 } 1203 return mount(source, target, fstype, flags, datap) 1204} 1205 1206// Sendto 1207// Recvfrom 1208// Socketpair 1209 1210/* 1211 * Direct access 1212 */ 1213//sys Acct(path string) (err error) 1214//sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error) 1215//sys Adjtimex(buf *Timex) (state int, err error) 1216//sys Chdir(path string) (err error) 1217//sys Chroot(path string) (err error) 1218//sys ClockGettime(clockid int32, time *Timespec) (err error) 1219//sys Close(fd int) (err error) 1220//sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 1221//sys Dup(oldfd int) (fd int, err error) 1222//sys Dup3(oldfd int, newfd int, flags int) (err error) 1223//sysnb EpollCreate(size int) (fd int, err error) 1224//sysnb EpollCreate1(flag int) (fd int, err error) 1225//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) 1226//sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2 1227//sys Exit(code int) = SYS_EXIT_GROUP 1228//sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) 1229//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error) 1230//sys Fchdir(fd int) (err error) 1231//sys Fchmod(fd int, mode uint32) (err error) 1232//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) 1233//sys fcntl(fd int, cmd int, arg int) (val int, err error) 1234//sys Fdatasync(fd int) (err error) 1235//sys Flock(fd int, how int) (err error) 1236//sys Fsync(fd int) (err error) 1237//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64 1238//sysnb Getpgid(pid int) (pgid int, err error) 1239 1240func Getpgrp() (pid int) { 1241 pid, _ = Getpgid(0) 1242 return 1243} 1244 1245//sysnb Getpid() (pid int) 1246//sysnb Getppid() (ppid int) 1247//sys Getpriority(which int, who int) (prio int, err error) 1248//sys Getrandom(buf []byte, flags int) (n int, err error) 1249//sysnb Getrusage(who int, rusage *Rusage) (err error) 1250//sysnb Getsid(pid int) (sid int, err error) 1251//sysnb Gettid() (tid int) 1252//sys Getxattr(path string, attr string, dest []byte) (sz int, err error) 1253//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) 1254//sysnb InotifyInit1(flags int) (fd int, err error) 1255//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) 1256//sysnb Kill(pid int, sig syscall.Signal) (err error) 1257//sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG 1258//sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error) 1259//sys Listxattr(path string, dest []byte) (sz int, err error) 1260//sys Llistxattr(path string, dest []byte) (sz int, err error) 1261//sys Lremovexattr(path string, attr string) (err error) 1262//sys Lsetxattr(path string, attr string, data []byte, flags int) (err error) 1263//sys Mkdirat(dirfd int, path string, mode uint32) (err error) 1264//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error) 1265//sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 1266//sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT 1267//sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 1268//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) 1269//sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6 1270//sys read(fd int, p []byte) (n int, err error) 1271//sys Removexattr(path string, attr string) (err error) 1272//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 1273//sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error) 1274//sys Setdomainname(p []byte) (err error) 1275//sys Sethostname(p []byte) (err error) 1276//sysnb Setpgid(pid int, pgid int) (err error) 1277//sysnb Setsid() (pid int, err error) 1278//sysnb Settimeofday(tv *Timeval) (err error) 1279//sys Setns(fd int, nstype int) (err error) 1280 1281// issue 1435. 1282// On linux Setuid and Setgid only affects the current thread, not the process. 1283// This does not match what most callers expect so we must return an error 1284// here rather than letting the caller think that the call succeeded. 1285 1286func Setuid(uid int) (err error) { 1287 return EOPNOTSUPP 1288} 1289 1290func Setgid(uid int) (err error) { 1291 return EOPNOTSUPP 1292} 1293 1294//sys Setpriority(which int, who int, prio int) (err error) 1295//sys Setxattr(path string, attr string, data []byte, flags int) (err error) 1296//sys Sync() 1297//sys Syncfs(fd int) (err error) 1298//sysnb Sysinfo(info *Sysinfo_t) (err error) 1299//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) 1300//sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) 1301//sysnb Times(tms *Tms) (ticks uintptr, err error) 1302//sysnb Umask(mask int) (oldmask int) 1303//sysnb Uname(buf *Utsname) (err error) 1304//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2 1305//sys Unshare(flags int) (err error) 1306//sys Ustat(dev int, ubuf *Ustat_t) (err error) 1307//sys write(fd int, p []byte) (n int, err error) 1308//sys exitThread(code int) (err error) = SYS_EXIT 1309//sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ 1310//sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE 1311 1312// mmap varies by architecture; see syscall_linux_*.go. 1313//sys munmap(addr uintptr, length uintptr) (err error) 1314 1315var mapper = &mmapper{ 1316 active: make(map[*byte][]byte), 1317 mmap: mmap, 1318 munmap: munmap, 1319} 1320 1321func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { 1322 return mapper.Mmap(fd, offset, length, prot, flags) 1323} 1324 1325func Munmap(b []byte) (err error) { 1326 return mapper.Munmap(b) 1327} 1328 1329//sys Madvise(b []byte, advice int) (err error) 1330//sys Mprotect(b []byte, prot int) (err error) 1331//sys Mlock(b []byte) (err error) 1332//sys Mlockall(flags int) (err error) 1333//sys Msync(b []byte, flags int) (err error) 1334//sys Munlock(b []byte) (err error) 1335//sys Munlockall() (err error) 1336 1337// Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd, 1338// using the specified flags. 1339func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { 1340 n, _, errno := Syscall6( 1341 SYS_VMSPLICE, 1342 uintptr(fd), 1343 uintptr(unsafe.Pointer(&iovs[0])), 1344 uintptr(len(iovs)), 1345 uintptr(flags), 1346 0, 1347 0, 1348 ) 1349 if errno != 0 { 1350 return 0, syscall.Errno(errno) 1351 } 1352 1353 return int(n), nil 1354} 1355 1356/* 1357 * Unimplemented 1358 */ 1359// AfsSyscall 1360// Alarm 1361// ArchPrctl 1362// Brk 1363// Capget 1364// Capset 1365// ClockGetres 1366// ClockNanosleep 1367// ClockSettime 1368// Clone 1369// CreateModule 1370// DeleteModule 1371// EpollCtlOld 1372// EpollPwait 1373// EpollWaitOld 1374// Execve 1375// Fgetxattr 1376// Flistxattr 1377// Fork 1378// Fremovexattr 1379// Fsetxattr 1380// Futex 1381// GetKernelSyms 1382// GetMempolicy 1383// GetRobustList 1384// GetThreadArea 1385// Getitimer 1386// Getpmsg 1387// IoCancel 1388// IoDestroy 1389// IoGetevents 1390// IoSetup 1391// IoSubmit 1392// IoprioGet 1393// IoprioSet 1394// KexecLoad 1395// LookupDcookie 1396// Mbind 1397// MigratePages 1398// Mincore 1399// ModifyLdt 1400// Mount 1401// MovePages 1402// MqGetsetattr 1403// MqNotify 1404// MqOpen 1405// MqTimedreceive 1406// MqTimedsend 1407// MqUnlink 1408// Mremap 1409// Msgctl 1410// Msgget 1411// Msgrcv 1412// Msgsnd 1413// Newfstatat 1414// Nfsservctl 1415// Personality 1416// Pselect6 1417// Ptrace 1418// Putpmsg 1419// QueryModule 1420// Quotactl 1421// Readahead 1422// Readv 1423// RemapFilePages 1424// RestartSyscall 1425// RtSigaction 1426// RtSigpending 1427// RtSigprocmask 1428// RtSigqueueinfo 1429// RtSigreturn 1430// RtSigsuspend 1431// RtSigtimedwait 1432// SchedGetPriorityMax 1433// SchedGetPriorityMin 1434// SchedGetaffinity 1435// SchedGetparam 1436// SchedGetscheduler 1437// SchedRrGetInterval 1438// SchedSetaffinity 1439// SchedSetparam 1440// SchedYield 1441// Security 1442// Semctl 1443// Semget 1444// Semop 1445// Semtimedop 1446// SetMempolicy 1447// SetRobustList 1448// SetThreadArea 1449// SetTidAddress 1450// Shmat 1451// Shmctl 1452// Shmdt 1453// Shmget 1454// Sigaltstack 1455// Signalfd 1456// Swapoff 1457// Swapon 1458// Sysfs 1459// TimerCreate 1460// TimerDelete 1461// TimerGetoverrun 1462// TimerGettime 1463// TimerSettime 1464// Timerfd 1465// Tkill (obsolete) 1466// Tuxcall 1467// Umount2 1468// Uselib 1469// Utimensat 1470// Vfork 1471// Vhangup 1472// Vserver 1473// Waitid 1474// _Sysctl 1475