mirror of
https://github.com/golang/sys.git
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437939a702
The minimum required Linux kernel version for Go 1.18 will be changed to 2.6.32, see golang/go#45964. The dup3 syscall was added in 2.6.27, so it can be used instead of the dup2 syscall which is not implemented on arm64 and riscv64 or blocked on android. For golang/go#45964 Change-Id: I9c677db4bae3ce441b258c49580fb9a2cd600436 Reviewed-on: https://go-review.googlesource.com/c/sys/+/350552 Trust: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Matt Layher <mdlayher@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
364 lines
10 KiB
Go
364 lines
10 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build 386 && linux
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// +build 386,linux
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package unix
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import (
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"unsafe"
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)
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func setTimespec(sec, nsec int64) Timespec {
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return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
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}
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func setTimeval(sec, usec int64) Timeval {
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return Timeval{Sec: int32(sec), Usec: int32(usec)}
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}
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// 64-bit file system and 32-bit uid calls
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// (386 default is 32-bit file system and 16-bit uid).
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//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
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//sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64
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//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
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//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
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//sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
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//sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
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//sysnb Getegid() (egid int) = SYS_GETEGID32
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//sysnb Geteuid() (euid int) = SYS_GETEUID32
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//sysnb Getgid() (gid int) = SYS_GETGID32
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//sysnb Getuid() (uid int) = SYS_GETUID32
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//sys Ioperm(from int, num int, on int) (err error)
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//sys Iopl(level int) (err error)
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//sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
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//sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
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//sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
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//sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
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//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
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//sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
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//sys setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32
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//sys setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32
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//sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
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//sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
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//sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
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//sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
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//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
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//sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
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//sys SyncFileRange(fd int, off int64, n int64, flags int) (err error)
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//sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
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//sys Ustat(dev int, ubuf *Ustat_t) (err error)
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//sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
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//sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
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//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
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//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
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//sys Pause() (err error)
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func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
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page := uintptr(offset / 4096)
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if offset != int64(page)*4096 {
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return 0, EINVAL
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}
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return mmap2(addr, length, prot, flags, fd, page)
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}
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type rlimit32 struct {
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Cur uint32
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Max uint32
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}
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//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
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const rlimInf32 = ^uint32(0)
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const rlimInf64 = ^uint64(0)
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func Getrlimit(resource int, rlim *Rlimit) (err error) {
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err = Prlimit(0, resource, nil, rlim)
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if err != ENOSYS {
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return err
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}
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rl := rlimit32{}
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err = getrlimit(resource, &rl)
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if err != nil {
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return
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}
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if rl.Cur == rlimInf32 {
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rlim.Cur = rlimInf64
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} else {
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rlim.Cur = uint64(rl.Cur)
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}
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if rl.Max == rlimInf32 {
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rlim.Max = rlimInf64
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} else {
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rlim.Max = uint64(rl.Max)
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}
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return
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}
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//sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
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func Setrlimit(resource int, rlim *Rlimit) (err error) {
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err = Prlimit(0, resource, rlim, nil)
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if err != ENOSYS {
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return err
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}
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rl := rlimit32{}
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if rlim.Cur == rlimInf64 {
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rl.Cur = rlimInf32
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} else if rlim.Cur < uint64(rlimInf32) {
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rl.Cur = uint32(rlim.Cur)
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} else {
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return EINVAL
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}
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if rlim.Max == rlimInf64 {
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rl.Max = rlimInf32
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} else if rlim.Max < uint64(rlimInf32) {
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rl.Max = uint32(rlim.Max)
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} else {
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return EINVAL
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}
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return setrlimit(resource, &rl)
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}
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func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
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newoffset, errno := seek(fd, offset, whence)
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if errno != 0 {
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return 0, errno
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}
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return newoffset, nil
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}
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//sys futimesat(dirfd int, path string, times *[2]Timeval) (err error)
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//sysnb Gettimeofday(tv *Timeval) (err error)
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//sysnb Time(t *Time_t) (tt Time_t, err error)
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//sys Utime(path string, buf *Utimbuf) (err error)
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//sys utimes(path string, times *[2]Timeval) (err error)
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// On x86 Linux, all the socket calls go through an extra indirection,
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// I think because the 5-register system call interface can't handle
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// the 6-argument calls like sendto and recvfrom. Instead the
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// arguments to the underlying system call are the number below
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// and a pointer to an array of uintptr. We hide the pointer in the
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// socketcall assembly to avoid allocation on every system call.
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const (
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// see linux/net.h
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_SOCKET = 1
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_BIND = 2
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_CONNECT = 3
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_LISTEN = 4
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_ACCEPT = 5
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_GETSOCKNAME = 6
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_GETPEERNAME = 7
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_SOCKETPAIR = 8
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_SEND = 9
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_RECV = 10
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_SENDTO = 11
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_RECVFROM = 12
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_SHUTDOWN = 13
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_SETSOCKOPT = 14
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_GETSOCKOPT = 15
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_SENDMSG = 16
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_RECVMSG = 17
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_ACCEPT4 = 18
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_RECVMMSG = 19
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_SENDMMSG = 20
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)
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func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) {
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fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) {
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fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
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_, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
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_, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) {
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_, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
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_, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
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_, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func socket(domain int, typ int, proto int) (fd int, err error) {
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fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) {
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_, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
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if e != 0 {
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err = e
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}
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return
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}
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func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {
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_, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) {
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var base uintptr
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if len(p) > 0 {
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base = uintptr(unsafe.Pointer(&p[0]))
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}
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n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
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if e != 0 {
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err = e
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}
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return
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}
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func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) {
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var base uintptr
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if len(p) > 0 {
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base = uintptr(unsafe.Pointer(&p[0]))
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}
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_, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen))
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if e != 0 {
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err = e
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}
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return
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}
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func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
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n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) {
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n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func Listen(s int, n int) (err error) {
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_, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func Shutdown(s, how int) (err error) {
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_, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0)
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if e != 0 {
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err = e
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}
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return
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}
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func Fstatfs(fd int, buf *Statfs_t) (err error) {
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_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
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if e != 0 {
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err = e
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}
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return
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}
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func Statfs(path string, buf *Statfs_t) (err error) {
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pathp, err := BytePtrFromString(path)
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if err != nil {
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return err
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}
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_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
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if e != 0 {
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err = e
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}
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return
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}
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func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) }
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func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) }
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func (iov *Iovec) SetLen(length int) {
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iov.Len = uint32(length)
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}
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func (msghdr *Msghdr) SetControllen(length int) {
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msghdr.Controllen = uint32(length)
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}
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func (msghdr *Msghdr) SetIovlen(length int) {
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msghdr.Iovlen = uint32(length)
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}
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func (cmsg *Cmsghdr) SetLen(length int) {
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cmsg.Len = uint32(length)
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}
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func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) {
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rsa.Service_name_len = uint32(length)
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}
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//sys poll(fds *PollFd, nfds int, timeout int) (n int, err error)
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func Poll(fds []PollFd, timeout int) (n int, err error) {
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if len(fds) == 0 {
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return poll(nil, 0, timeout)
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}
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return poll(&fds[0], len(fds), timeout)
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}
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