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.
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.
23 func Access(path string, mode uint32) (err error) {
24 return Faccessat(AT_FDCWD, path, mode, 0)
27 func Chmod(path string, mode uint32) (err error) {
28 return Fchmodat(AT_FDCWD, path, mode, 0)
31 func Chown(path string, uid int, gid int) (err error) {
32 return Fchownat(AT_FDCWD, path, uid, gid, 0)
35 func Creat(path string, mode uint32) (fd int, err error) {
36 return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
39 //sys fchmodat(dirfd int, path string, mode uint32) (err error)
41 func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
42 // Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior
43 // and check the flags. Otherwise the mode would be applied to the symlink
44 // destination which is not what the user expects.
45 if flags&^AT_SYMLINK_NOFOLLOW != 0 {
47 } else if flags&AT_SYMLINK_NOFOLLOW != 0 {
50 return fchmodat(dirfd, path, mode)
53 //sys ioctl(fd int, req uint, arg uintptr) (err error)
55 // ioctl itself should not be exposed directly, but additional get/set
56 // functions for specific types are permissible.
58 // IoctlSetInt performs an ioctl operation which sets an integer value
59 // on fd, using the specified request number.
60 func IoctlSetInt(fd int, req uint, value int) error {
61 return ioctl(fd, req, uintptr(value))
64 func ioctlSetWinsize(fd int, req uint, value *Winsize) error {
65 return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
68 func ioctlSetTermios(fd int, req uint, value *Termios) error {
69 return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
72 // IoctlGetInt performs an ioctl operation which gets an integer value
73 // from fd, using the specified request number.
74 func IoctlGetInt(fd int, req uint) (int, error) {
76 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
80 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) {
82 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
86 func IoctlGetTermios(fd int, req uint) (*Termios, error) {
88 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
92 //sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
94 func Link(oldpath string, newpath string) (err error) {
95 return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0)
98 func Mkdir(path string, mode uint32) (err error) {
99 return Mkdirat(AT_FDCWD, path, mode)
102 func Mknod(path string, mode uint32, dev int) (err error) {
103 return Mknodat(AT_FDCWD, path, mode, dev)
106 func Open(path string, mode int, perm uint32) (fd int, err error) {
107 return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm)
110 //sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
112 func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
113 return openat(dirfd, path, flags|O_LARGEFILE, mode)
116 //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error)
118 func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {
120 return ppoll(nil, 0, timeout, sigmask)
122 return ppoll(&fds[0], len(fds), timeout, sigmask)
125 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
127 func Readlink(path string, buf []byte) (n int, err error) {
128 return Readlinkat(AT_FDCWD, path, buf)
131 func Rename(oldpath string, newpath string) (err error) {
132 return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath)
135 func Rmdir(path string) error {
136 return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR)
139 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
141 func Symlink(oldpath string, newpath string) (err error) {
142 return Symlinkat(oldpath, AT_FDCWD, newpath)
145 func Unlink(path string) error {
146 return Unlinkat(AT_FDCWD, path, 0)
149 //sys Unlinkat(dirfd int, path string, flags int) (err error)
151 func Utimes(path string, tv []Timeval) error {
153 err := utimensat(AT_FDCWD, path, nil, 0)
157 return utimes(path, nil)
163 ts[0] = NsecToTimespec(TimevalToNsec(tv[0]))
164 ts[1] = NsecToTimespec(TimevalToNsec(tv[1]))
165 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
169 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
172 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
174 func UtimesNano(path string, ts []Timespec) error {
176 err := utimensat(AT_FDCWD, path, nil, 0)
180 return utimes(path, nil)
185 err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
189 // If the utimensat syscall isn't available (utimensat was added to Linux
190 // in 2.6.22, Released, 8 July 2007) then fall back to utimes
192 for i := 0; i < 2; i++ {
193 tv[i] = NsecToTimeval(TimespecToNsec(ts[i]))
195 return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
198 func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
200 return utimensat(dirfd, path, nil, flags)
205 return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
208 func Futimesat(dirfd int, path string, tv []Timeval) error {
210 return futimesat(dirfd, path, nil)
215 return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
218 func Futimes(fd int, tv []Timeval) (err error) {
219 // Believe it or not, this is the best we can do on Linux
220 // (and is what glibc does).
221 return Utimes("/proc/self/fd/"+itoa(fd), tv)
224 const ImplementsGetwd = true
226 //sys Getcwd(buf []byte) (n int, err error)
228 func Getwd() (wd string, err error) {
229 var buf [PathMax]byte
230 n, err := Getcwd(buf[0:])
234 // Getcwd returns the number of bytes written to buf, including the NUL.
235 if n < 1 || n > len(buf) || buf[n-1] != 0 {
238 return string(buf[0 : n-1]), nil
241 func Getgroups() (gids []int, err error) {
242 n, err := getgroups(0, nil)
250 // Sanity check group count. Max is 1<<16 on Linux.
251 if n < 0 || n > 1<<20 {
255 a := make([]_Gid_t, n)
256 n, err = getgroups(n, &a[0])
260 gids = make([]int, n)
261 for i, v := range a[0:n] {
267 func Setgroups(gids []int) (err error) {
269 return setgroups(0, nil)
272 a := make([]_Gid_t, len(gids))
273 for i, v := range gids {
276 return setgroups(len(a), &a[0])
279 type WaitStatus uint32
281 // Wait status is 7 bits at bottom, either 0 (exited),
282 // 0x7F (stopped), or a signal number that caused an exit.
283 // The 0x80 bit is whether there was a core dump.
284 // An extra number (exit code, signal causing a stop)
285 // is in the high bits. At least that's the idea.
286 // There are various irregularities. For example, the
287 // "continued" status is 0xFFFF, distinguishing itself
288 // from stopped via the core dump bit.
298 func (w WaitStatus) Exited() bool { return w&mask == exited }
300 func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
302 func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
304 func (w WaitStatus) Continued() bool { return w == 0xFFFF }
306 func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
308 func (w WaitStatus) ExitStatus() int {
312 return int(w>>shift) & 0xFF
315 func (w WaitStatus) Signal() syscall.Signal {
319 return syscall.Signal(w & mask)
322 func (w WaitStatus) StopSignal() syscall.Signal {
326 return syscall.Signal(w>>shift) & 0xFF
329 func (w WaitStatus) TrapCause() int {
330 if w.StopSignal() != SIGTRAP {
333 return int(w>>shift) >> 8
336 //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
338 func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
340 wpid, err = wait4(pid, &status, options, rusage)
342 *wstatus = WaitStatus(status)
347 func Mkfifo(path string, mode uint32) error {
348 return Mknod(path, mode|S_IFIFO, 0)
351 func Mkfifoat(dirfd int, path string, mode uint32) error {
352 return Mknodat(dirfd, path, mode|S_IFIFO, 0)
355 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
356 if sa.Port < 0 || sa.Port > 0xFFFF {
357 return nil, 0, EINVAL
359 sa.raw.Family = AF_INET
360 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
361 p[0] = byte(sa.Port >> 8)
363 for i := 0; i < len(sa.Addr); i++ {
364 sa.raw.Addr[i] = sa.Addr[i]
366 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
369 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
370 if sa.Port < 0 || sa.Port > 0xFFFF {
371 return nil, 0, EINVAL
373 sa.raw.Family = AF_INET6
374 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
375 p[0] = byte(sa.Port >> 8)
377 sa.raw.Scope_id = sa.ZoneId
378 for i := 0; i < len(sa.Addr); i++ {
379 sa.raw.Addr[i] = sa.Addr[i]
381 return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
384 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
387 if n >= len(sa.raw.Path) {
388 return nil, 0, EINVAL
390 sa.raw.Family = AF_UNIX
391 for i := 0; i < n; i++ {
392 sa.raw.Path[i] = int8(name[i])
394 // length is family (uint16), name, NUL.
397 sl += _Socklen(n) + 1
399 if sa.raw.Path[0] == '@' {
401 // Don't count trailing NUL for abstract address.
405 return unsafe.Pointer(&sa.raw), sl, nil
408 // SockaddrLinklayer implements the Sockaddr interface for AF_PACKET type sockets.
409 type SockaddrLinklayer struct {
416 raw RawSockaddrLinklayer
419 func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) {
420 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
421 return nil, 0, EINVAL
423 sa.raw.Family = AF_PACKET
424 sa.raw.Protocol = sa.Protocol
425 sa.raw.Ifindex = int32(sa.Ifindex)
426 sa.raw.Hatype = sa.Hatype
427 sa.raw.Pkttype = sa.Pkttype
428 sa.raw.Halen = sa.Halen
429 for i := 0; i < len(sa.Addr); i++ {
430 sa.raw.Addr[i] = sa.Addr[i]
432 return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil
435 // SockaddrNetlink implements the Sockaddr interface for AF_NETLINK type sockets.
436 type SockaddrNetlink struct {
441 raw RawSockaddrNetlink
444 func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) {
445 sa.raw.Family = AF_NETLINK
448 sa.raw.Groups = sa.Groups
449 return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil
452 // SockaddrHCI implements the Sockaddr interface for AF_BLUETOOTH type sockets
453 // using the HCI protocol.
454 type SockaddrHCI struct {
460 func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) {
461 sa.raw.Family = AF_BLUETOOTH
463 sa.raw.Channel = sa.Channel
464 return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil
467 // SockaddrL2 implements the Sockaddr interface for AF_BLUETOOTH type sockets
468 // using the L2CAP protocol.
469 type SockaddrL2 struct {
477 func (sa *SockaddrL2) sockaddr() (unsafe.Pointer, _Socklen, error) {
478 sa.raw.Family = AF_BLUETOOTH
479 psm := (*[2]byte)(unsafe.Pointer(&sa.raw.Psm))
480 psm[0] = byte(sa.PSM)
481 psm[1] = byte(sa.PSM >> 8)
482 for i := 0; i < len(sa.Addr); i++ {
483 sa.raw.Bdaddr[i] = sa.Addr[len(sa.Addr)-1-i]
485 cid := (*[2]byte)(unsafe.Pointer(&sa.raw.Cid))
486 cid[0] = byte(sa.CID)
487 cid[1] = byte(sa.CID >> 8)
488 sa.raw.Bdaddr_type = sa.AddrType
489 return unsafe.Pointer(&sa.raw), SizeofSockaddrL2, nil
492 // SockaddrRFCOMM implements the Sockaddr interface for AF_BLUETOOTH type sockets
493 // using the RFCOMM protocol.
497 // fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
498 // _ = unix.Bind(fd, &unix.SockaddrRFCOMM{
500 // Addr: [6]uint8{0, 0, 0, 0, 0, 0}, // BDADDR_ANY or 00:00:00:00:00:00
503 // nfd, sa, _ := Accept(fd)
504 // fmt.Printf("conn addr=%v fd=%d", sa.(*unix.SockaddrRFCOMM).Addr, nfd)
509 // fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
510 // _ = Connect(fd, &SockaddrRFCOMM{
512 // Addr: [6]byte{0x11, 0x22, 0x33, 0xaa, 0xbb, 0xcc}, // CC:BB:AA:33:22:11
514 // Write(fd, []byte(`hello`))
515 type SockaddrRFCOMM struct {
516 // Addr represents a bluetooth address, byte ordering is little-endian.
519 // Channel is a designated bluetooth channel, only 1-30 are available for use.
520 // Since Linux 2.6.7 and further zero value is the first available channel.
523 raw RawSockaddrRFCOMM
526 func (sa *SockaddrRFCOMM) sockaddr() (unsafe.Pointer, _Socklen, error) {
527 sa.raw.Family = AF_BLUETOOTH
528 sa.raw.Channel = sa.Channel
529 sa.raw.Bdaddr = sa.Addr
530 return unsafe.Pointer(&sa.raw), SizeofSockaddrRFCOMM, nil
533 // SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets.
534 // The RxID and TxID fields are used for transport protocol addressing in
535 // (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with
536 // zero values for CAN_RAW and CAN_BCM sockets as they have no meaning.
538 // The SockaddrCAN struct must be bound to the socket file descriptor
539 // using Bind before the CAN socket can be used.
541 // // Read one raw CAN frame
542 // fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW)
543 // addr := &SockaddrCAN{Ifindex: index}
545 // frame := make([]byte, 16)
548 // The full SocketCAN documentation can be found in the linux kernel
549 // archives at: https://www.kernel.org/doc/Documentation/networking/can.txt
550 type SockaddrCAN struct {
557 func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) {
558 if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
559 return nil, 0, EINVAL
561 sa.raw.Family = AF_CAN
562 sa.raw.Ifindex = int32(sa.Ifindex)
563 rx := (*[4]byte)(unsafe.Pointer(&sa.RxID))
564 for i := 0; i < 4; i++ {
565 sa.raw.Addr[i] = rx[i]
567 tx := (*[4]byte)(unsafe.Pointer(&sa.TxID))
568 for i := 0; i < 4; i++ {
569 sa.raw.Addr[i+4] = tx[i]
571 return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil
574 // SockaddrALG implements the Sockaddr interface for AF_ALG type sockets.
575 // SockaddrALG enables userspace access to the Linux kernel's cryptography
576 // subsystem. The Type and Name fields specify which type of hash or cipher
577 // should be used with a given socket.
579 // To create a file descriptor that provides access to a hash or cipher, both
580 // Bind and Accept must be used. Once the setup process is complete, input
581 // data can be written to the socket, processed by the kernel, and then read
582 // back as hash output or ciphertext.
584 // Here is an example of using an AF_ALG socket with SHA1 hashing.
585 // The initial socket setup process is as follows:
587 // // Open a socket to perform SHA1 hashing.
588 // fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0)
589 // addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"}
590 // unix.Bind(fd, addr)
591 // // Note: unix.Accept does not work at this time; must invoke accept()
592 // // manually using unix.Syscall.
593 // hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0)
595 // Once a file descriptor has been returned from Accept, it may be used to
596 // perform SHA1 hashing. The descriptor is not safe for concurrent use, but
597 // may be re-used repeatedly with subsequent Write and Read operations.
599 // When hashing a small byte slice or string, a single Write and Read may
602 // // Assume hashfd is already configured using the setup process.
603 // hash := os.NewFile(hashfd, "sha1")
604 // // Hash an input string and read the results. Each Write discards
605 // // previous hash state. Read always reads the current state.
606 // b := make([]byte, 20)
607 // for i := 0; i < 2; i++ {
608 // io.WriteString(hash, "Hello, world.")
610 // fmt.Println(hex.EncodeToString(b))
613 // // 2ae01472317d1935a84797ec1983ae243fc6aa28
614 // // 2ae01472317d1935a84797ec1983ae243fc6aa28
616 // For hashing larger byte slices, or byte streams such as those read from
617 // a file or socket, use Sendto with MSG_MORE to instruct the kernel to update
618 // the hash digest instead of creating a new one for a given chunk and finalizing it.
620 // // Assume hashfd and addr are already configured using the setup process.
621 // hash := os.NewFile(hashfd, "sha1")
622 // // Hash the contents of a file.
623 // f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz")
624 // b := make([]byte, 4096)
626 // n, err := f.Read(b)
627 // if err == io.EOF {
630 // unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr)
633 // fmt.Println(hex.EncodeToString(b))
634 // // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5
636 // For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html.
637 type SockaddrALG struct {
645 func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) {
646 // Leave room for NUL byte terminator.
647 if len(sa.Type) > 13 {
648 return nil, 0, EINVAL
650 if len(sa.Name) > 63 {
651 return nil, 0, EINVAL
654 sa.raw.Family = AF_ALG
655 sa.raw.Feat = sa.Feature
656 sa.raw.Mask = sa.Mask
658 typ, err := ByteSliceFromString(sa.Type)
662 name, err := ByteSliceFromString(sa.Name)
667 copy(sa.raw.Type[:], typ)
668 copy(sa.raw.Name[:], name)
670 return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil
673 // SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets.
674 // SockaddrVM provides access to Linux VM sockets: a mechanism that enables
675 // bidirectional communication between a hypervisor and its guest virtual
677 type SockaddrVM struct {
678 // CID and Port specify a context ID and port address for a VM socket.
679 // Guests have a unique CID, and hosts may have a well-known CID of:
680 // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process.
681 // - VMADDR_CID_HOST: refers to other processes on the host.
687 func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) {
688 sa.raw.Family = AF_VSOCK
689 sa.raw.Port = sa.Port
692 return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil
695 type SockaddrXDP struct {
703 func (sa *SockaddrXDP) sockaddr() (unsafe.Pointer, _Socklen, error) {
704 sa.raw.Family = AF_XDP
705 sa.raw.Flags = sa.Flags
706 sa.raw.Ifindex = sa.Ifindex
707 sa.raw.Queue_id = sa.QueueID
708 sa.raw.Shared_umem_fd = sa.SharedUmemFD
710 return unsafe.Pointer(&sa.raw), SizeofSockaddrXDP, nil
713 func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
714 switch rsa.Addr.Family {
716 pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
717 sa := new(SockaddrNetlink)
718 sa.Family = pp.Family
721 sa.Groups = pp.Groups
725 pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
726 sa := new(SockaddrLinklayer)
727 sa.Protocol = pp.Protocol
728 sa.Ifindex = int(pp.Ifindex)
729 sa.Hatype = pp.Hatype
730 sa.Pkttype = pp.Pkttype
732 for i := 0; i < len(sa.Addr); i++ {
733 sa.Addr[i] = pp.Addr[i]
738 pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
739 sa := new(SockaddrUnix)
741 // "Abstract" Unix domain socket.
742 // Rewrite leading NUL as @ for textual display.
743 // (This is the standard convention.)
744 // Not friendly to overwrite in place,
745 // but the callers below don't care.
749 // Assume path ends at NUL.
750 // This is not technically the Linux semantics for
751 // abstract Unix domain sockets--they are supposed
752 // to be uninterpreted fixed-size binary blobs--but
753 // everyone uses this convention.
755 for n < len(pp.Path) && pp.Path[n] != 0 {
758 bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
759 sa.Name = string(bytes)
763 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
764 sa := new(SockaddrInet4)
765 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
766 sa.Port = int(p[0])<<8 + int(p[1])
767 for i := 0; i < len(sa.Addr); i++ {
768 sa.Addr[i] = pp.Addr[i]
773 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
774 sa := new(SockaddrInet6)
775 p := (*[2]byte)(unsafe.Pointer(&pp.Port))
776 sa.Port = int(p[0])<<8 + int(p[1])
777 sa.ZoneId = pp.Scope_id
778 for i := 0; i < len(sa.Addr); i++ {
779 sa.Addr[i] = pp.Addr[i]
784 pp := (*RawSockaddrVM)(unsafe.Pointer(rsa))
791 proto, err := GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL)
795 // only BTPROTO_L2CAP and BTPROTO_RFCOMM can accept connections
798 pp := (*RawSockaddrL2)(unsafe.Pointer(rsa))
803 AddrType: pp.Bdaddr_type,
807 pp := (*RawSockaddrRFCOMM)(unsafe.Pointer(rsa))
808 sa := &SockaddrRFCOMM{
815 pp := (*RawSockaddrXDP)(unsafe.Pointer(rsa))
819 QueueID: pp.Queue_id,
820 SharedUmemFD: pp.Shared_umem_fd,
824 return nil, EAFNOSUPPORT
827 func Accept(fd int) (nfd int, sa Sockaddr, err error) {
828 var rsa RawSockaddrAny
829 var len _Socklen = SizeofSockaddrAny
830 nfd, err = accept(fd, &rsa, &len)
834 sa, err = anyToSockaddr(fd, &rsa)
842 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
843 var rsa RawSockaddrAny
844 var len _Socklen = SizeofSockaddrAny
845 nfd, err = accept4(fd, &rsa, &len, flags)
849 if len > SizeofSockaddrAny {
850 panic("RawSockaddrAny too small")
852 sa, err = anyToSockaddr(fd, &rsa)
860 func Getsockname(fd int) (sa Sockaddr, err error) {
861 var rsa RawSockaddrAny
862 var len _Socklen = SizeofSockaddrAny
863 if err = getsockname(fd, &rsa, &len); err != nil {
866 return anyToSockaddr(fd, &rsa)
869 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
871 vallen := _Socklen(SizeofIPMreqn)
872 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
876 func GetsockoptUcred(fd, level, opt int) (*Ucred, error) {
878 vallen := _Socklen(SizeofUcred)
879 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
883 func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) {
885 vallen := _Socklen(SizeofTCPInfo)
886 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
890 // GetsockoptString returns the string value of the socket option opt for the
891 // socket associated with fd at the given socket level.
892 func GetsockoptString(fd, level, opt int) (string, error) {
893 buf := make([]byte, 256)
894 vallen := _Socklen(len(buf))
895 err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
898 buf = make([]byte, vallen)
899 err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
905 return string(buf[:vallen-1]), nil
908 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
909 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
912 // Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html)
914 // KeyctlInt calls keyctl commands in which each argument is an int.
915 // These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK,
916 // KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT,
917 // KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT,
918 // KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT.
919 //sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL
921 // KeyctlBuffer calls keyctl commands in which the third and fourth
922 // arguments are a buffer and its length, respectively.
923 // These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE.
924 //sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL
926 // KeyctlString calls keyctl commands which return a string.
927 // These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY.
928 func KeyctlString(cmd int, id int) (string, error) {
929 // We must loop as the string data may change in between the syscalls.
930 // We could allocate a large buffer here to reduce the chance that the
931 // syscall needs to be called twice; however, this is unnecessary as
932 // the performance loss is negligible.
935 // Try to fill the buffer with data
936 length, err := KeyctlBuffer(cmd, id, buffer, 0)
941 // Check if the data was written
942 if length <= len(buffer) {
943 // Exclude the null terminator
944 return string(buffer[:length-1]), nil
947 // Make a bigger buffer if needed
948 buffer = make([]byte, length)
952 // Keyctl commands with special signatures.
954 // KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command.
955 // See the full documentation at:
956 // http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html
957 func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) {
962 return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0)
965 // KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the
966 // key handle permission mask as described in the "keyctl setperm" section of
967 // http://man7.org/linux/man-pages/man1/keyctl.1.html.
968 // See the full documentation at:
969 // http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html
970 func KeyctlSetperm(id int, perm uint32) error {
971 _, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0)
975 //sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL
977 // KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command.
978 // See the full documentation at:
979 // http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html
980 func KeyctlJoinSessionKeyring(name string) (ringid int, err error) {
981 return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name)
984 //sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL
986 // KeyctlSearch implements the KEYCTL_SEARCH command.
987 // See the full documentation at:
988 // http://man7.org/linux/man-pages/man3/keyctl_search.3.html
989 func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) {
990 return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid)
993 //sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL
995 // KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This
996 // command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice
997 // of Iovec (each of which represents a buffer) instead of a single buffer.
998 // See the full documentation at:
999 // http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html
1000 func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error {
1001 return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid)
1004 //sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL
1006 // KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command
1007 // computes a Diffie-Hellman shared secret based on the provide params. The
1008 // secret is written to the provided buffer and the returned size is the number
1009 // of bytes written (returning an error if there is insufficient space in the
1010 // buffer). If a nil buffer is passed in, this function returns the minimum
1011 // buffer length needed to store the appropriate data. Note that this differs
1012 // from KEYCTL_READ's behavior which always returns the requested payload size.
1013 // See the full documentation at:
1014 // http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html
1015 func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) {
1016 return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer)
1019 func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
1021 var rsa RawSockaddrAny
1022 msg.Name = (*byte)(unsafe.Pointer(&rsa))
1023 msg.Namelen = uint32(SizeofSockaddrAny)
1033 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
1037 // receive at least one normal byte
1038 if sockType != SOCK_DGRAM {
1043 msg.Control = &oob[0]
1044 msg.SetControllen(len(oob))
1048 if n, err = recvmsg(fd, &msg, flags); err != nil {
1051 oobn = int(msg.Controllen)
1052 recvflags = int(msg.Flags)
1053 // source address is only specified if the socket is unconnected
1054 if rsa.Addr.Family != AF_UNSPEC {
1055 from, err = anyToSockaddr(fd, &rsa)
1060 func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
1061 _, err = SendmsgN(fd, p, oob, to, flags)
1065 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
1066 var ptr unsafe.Pointer
1070 ptr, salen, err = to.sockaddr()
1076 msg.Name = (*byte)(ptr)
1077 msg.Namelen = uint32(salen)
1087 sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
1091 // send at least one normal byte
1092 if sockType != SOCK_DGRAM {
1097 msg.Control = &oob[0]
1098 msg.SetControllen(len(oob))
1102 if n, err = sendmsg(fd, &msg, flags); err != nil {
1105 if len(oob) > 0 && len(p) == 0 {
1111 // BindToDevice binds the socket associated with fd to device.
1112 func BindToDevice(fd int, device string) (err error) {
1113 return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
1116 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
1118 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
1119 // The peek requests are machine-size oriented, so we wrap it
1120 // to retrieve arbitrary-length data.
1122 // The ptrace syscall differs from glibc's ptrace.
1123 // Peeks returns the word in *data, not as the return value.
1125 var buf [SizeofPtr]byte
1127 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned
1128 // access (PEEKUSER warns that it might), but if we don't
1129 // align our reads, we might straddle an unmapped page
1130 // boundary and not get the bytes leading up to the page
1133 if addr%SizeofPtr != 0 {
1134 err = ptrace(req, pid, addr-addr%SizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
1138 n += copy(out, buf[addr%SizeofPtr:])
1144 // We use an internal buffer to guarantee alignment.
1145 // It's not documented if this is necessary, but we're paranoid.
1146 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
1150 copied := copy(out, buf[0:])
1158 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
1159 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
1162 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
1163 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
1166 func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) {
1167 return ptracePeek(PTRACE_PEEKUSR, pid, addr, out)
1170 func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
1171 // As for ptracePeek, we need to align our accesses to deal
1172 // with the possibility of straddling an invalid page.
1176 if addr%SizeofPtr != 0 {
1177 var buf [SizeofPtr]byte
1178 err = ptrace(peekReq, pid, addr-addr%SizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
1182 n += copy(buf[addr%SizeofPtr:], data)
1183 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
1184 err = ptrace(pokeReq, pid, addr-addr%SizeofPtr, word)
1192 for len(data) > SizeofPtr {
1193 word := *((*uintptr)(unsafe.Pointer(&data[0])))
1194 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
1199 data = data[SizeofPtr:]
1204 var buf [SizeofPtr]byte
1205 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
1210 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
1211 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
1221 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
1222 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
1225 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
1226 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
1229 func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) {
1230 return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data)
1233 func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
1234 return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout)))
1237 func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
1238 return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs)))
1241 func PtraceSetOptions(pid int, options int) (err error) {
1242 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
1245 func PtraceGetEventMsg(pid int) (msg uint, err error) {
1247 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
1252 func PtraceCont(pid int, signal int) (err error) {
1253 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
1256 func PtraceSyscall(pid int, signal int) (err error) {
1257 return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal))
1260 func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
1262 func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
1264 func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
1266 //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
1268 func Reboot(cmd int) (err error) {
1269 return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
1272 func ReadDirent(fd int, buf []byte) (n int, err error) {
1273 return Getdents(fd, buf)
1276 //sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error)
1278 func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
1279 // Certain file systems get rather angry and EINVAL if you give
1280 // them an empty string of data, rather than NULL.
1282 return mount(source, target, fstype, flags, nil)
1284 datap, err := BytePtrFromString(data)
1288 return mount(source, target, fstype, flags, datap)
1298 //sys Acct(path string) (err error)
1299 //sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error)
1300 //sys Adjtimex(buf *Timex) (state int, err error)
1301 //sys Chdir(path string) (err error)
1302 //sys Chroot(path string) (err error)
1303 //sys ClockGetres(clockid int32, res *Timespec) (err error)
1304 //sys ClockGettime(clockid int32, time *Timespec) (err error)
1305 //sys Close(fd int) (err error)
1306 //sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
1307 //sys DeleteModule(name string, flags int) (err error)
1308 //sys Dup(oldfd int) (fd int, err error)
1309 //sys Dup3(oldfd int, newfd int, flags int) (err error)
1310 //sysnb EpollCreate1(flag int) (fd int, err error)
1311 //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
1312 //sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2
1313 //sys Exit(code int) = SYS_EXIT_GROUP
1314 //sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
1315 //sys Fchdir(fd int) (err error)
1316 //sys Fchmod(fd int, mode uint32) (err error)
1317 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
1318 //sys fcntl(fd int, cmd int, arg int) (val int, err error)
1319 //sys Fdatasync(fd int) (err error)
1320 //sys Fgetxattr(fd int, attr string, dest []byte) (sz int, err error)
1321 //sys FinitModule(fd int, params string, flags int) (err error)
1322 //sys Flistxattr(fd int, dest []byte) (sz int, err error)
1323 //sys Flock(fd int, how int) (err error)
1324 //sys Fremovexattr(fd int, attr string) (err error)
1325 //sys Fsetxattr(fd int, attr string, dest []byte, flags int) (err error)
1326 //sys Fsync(fd int) (err error)
1327 //sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
1328 //sysnb Getpgid(pid int) (pgid int, err error)
1330 func Getpgrp() (pid int) {
1335 //sysnb Getpid() (pid int)
1336 //sysnb Getppid() (ppid int)
1337 //sys Getpriority(which int, who int) (prio int, err error)
1338 //sys Getrandom(buf []byte, flags int) (n int, err error)
1339 //sysnb Getrusage(who int, rusage *Rusage) (err error)
1340 //sysnb Getsid(pid int) (sid int, err error)
1341 //sysnb Gettid() (tid int)
1342 //sys Getxattr(path string, attr string, dest []byte) (sz int, err error)
1343 //sys InitModule(moduleImage []byte, params string) (err error)
1344 //sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
1345 //sysnb InotifyInit1(flags int) (fd int, err error)
1346 //sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
1347 //sysnb Kill(pid int, sig syscall.Signal) (err error)
1348 //sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG
1349 //sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error)
1350 //sys Listxattr(path string, dest []byte) (sz int, err error)
1351 //sys Llistxattr(path string, dest []byte) (sz int, err error)
1352 //sys Lremovexattr(path string, attr string) (err error)
1353 //sys Lsetxattr(path string, attr string, data []byte, flags int) (err error)
1354 //sys MemfdCreate(name string, flags int) (fd int, err error)
1355 //sys Mkdirat(dirfd int, path string, mode uint32) (err error)
1356 //sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
1357 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
1358 //sys PerfEventOpen(attr *PerfEventAttr, pid int, cpu int, groupFd int, flags int) (fd int, err error)
1359 //sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT
1360 //sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64
1361 //sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error)
1362 //sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6
1363 //sys read(fd int, p []byte) (n int, err error)
1364 //sys Removexattr(path string, attr string) (err error)
1365 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
1366 //sys Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error)
1367 //sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error)
1368 //sys Setdomainname(p []byte) (err error)
1369 //sys Sethostname(p []byte) (err error)
1370 //sysnb Setpgid(pid int, pgid int) (err error)
1371 //sysnb Setsid() (pid int, err error)
1372 //sysnb Settimeofday(tv *Timeval) (err error)
1373 //sys Setns(fd int, nstype int) (err error)
1376 // On linux Setuid and Setgid only affects the current thread, not the process.
1377 // This does not match what most callers expect so we must return an error
1378 // here rather than letting the caller think that the call succeeded.
1380 func Setuid(uid int) (err error) {
1384 func Setgid(uid int) (err error) {
1388 //sys Setpriority(which int, who int, prio int) (err error)
1389 //sys Setxattr(path string, attr string, data []byte, flags int) (err error)
1390 //sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error)
1392 //sys Syncfs(fd int) (err error)
1393 //sysnb Sysinfo(info *Sysinfo_t) (err error)
1394 //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
1395 //sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error)
1396 //sysnb Times(tms *Tms) (ticks uintptr, err error)
1397 //sysnb Umask(mask int) (oldmask int)
1398 //sysnb Uname(buf *Utsname) (err error)
1399 //sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
1400 //sys Unshare(flags int) (err error)
1401 //sys write(fd int, p []byte) (n int, err error)
1402 //sys exitThread(code int) (err error) = SYS_EXIT
1403 //sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ
1404 //sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE
1406 // mmap varies by architecture; see syscall_linux_*.go.
1407 //sys munmap(addr uintptr, length uintptr) (err error)
1409 var mapper = &mmapper{
1410 active: make(map[*byte][]byte),
1415 func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
1416 return mapper.Mmap(fd, offset, length, prot, flags)
1419 func Munmap(b []byte) (err error) {
1420 return mapper.Munmap(b)
1423 //sys Madvise(b []byte, advice int) (err error)
1424 //sys Mprotect(b []byte, prot int) (err error)
1425 //sys Mlock(b []byte) (err error)
1426 //sys Mlockall(flags int) (err error)
1427 //sys Msync(b []byte, flags int) (err error)
1428 //sys Munlock(b []byte) (err error)
1429 //sys Munlockall() (err error)
1431 // Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd,
1432 // using the specified flags.
1433 func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) {
1434 n, _, errno := Syscall6(
1437 uintptr(unsafe.Pointer(&iovs[0])),
1444 return 0, syscall.Errno(errno)
1450 //sys faccessat(dirfd int, path string, mode uint32) (err error)
1452 func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
1453 if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 {
1457 // The Linux kernel faccessat system call does not take any flags.
1458 // The glibc faccessat implements the flags itself; see
1459 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD
1460 // Because people naturally expect syscall.Faccessat to act
1461 // like C faccessat, we do the same.
1464 return faccessat(dirfd, path, mode)
1468 if err := Fstatat(dirfd, path, &st, flags&AT_SYMLINK_NOFOLLOW); err != nil {
1478 if flags&AT_EACCESS != 0 {
1486 // Root can read and write any file.
1489 if st.Mode&0111 != 0 {
1490 // Root can execute any file that anybody can execute.
1497 if uint32(uid) == st.Uid {
1498 fmode = (st.Mode >> 6) & 7
1501 if flags&AT_EACCESS != 0 {
1507 if uint32(gid) == st.Gid {
1508 fmode = (st.Mode >> 3) & 7
1514 if fmode&mode == mode {
1588 // SchedGetPriorityMax
1589 // SchedGetPriorityMin
1591 // SchedGetscheduler
1592 // SchedRrGetInterval