| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) |
| // so that go vet can check that they are correct. |
| |
| package syscall |
| |
| import "unsafe" |
| |
| func Getpagesize() int { return 4096 } |
| |
| func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } |
| |
| func NsecToTimespec(nsec int64) (ts Timespec) { |
| ts.Sec = int32(nsec / 1e9) |
| ts.Nsec = int32(nsec % 1e9) |
| return |
| } |
| |
| func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 } |
| |
| func NsecToTimeval(nsec int64) (tv Timeval) { |
| nsec += 999 // round up to microsecond |
| tv.Sec = int32(nsec / 1e9) |
| tv.Usec = int32(nsec % 1e9 / 1e3) |
| return |
| } |
| |
| // 64-bit file system and 32-bit uid calls |
| // (386 default is 32-bit file system and 16-bit uid). |
| //sys Chown(path string, uid int, gid int) (err error) = SYS_CHOWN32 |
| //sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 |
| //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 |
| //sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 |
| //sysnb Getegid() (egid int) = SYS_GETEGID32 |
| //sysnb Geteuid() (euid int) = SYS_GETEUID32 |
| //sysnb Getgid() (gid int) = SYS_GETGID32 |
| //sysnb Getuid() (uid int) = SYS_GETUID32 |
| //sys Ioperm(from int, num int, on int) (err error) |
| //sys Iopl(level int) (err error) |
| //sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32 |
| //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 |
| //sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 |
| //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 |
| //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 |
| //sys Setfsgid(gid int) (err error) = SYS_SETFSGID32 |
| //sys Setfsuid(uid int) (err error) = SYS_SETFSUID32 |
| //sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32 |
| //sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32 |
| //sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32 |
| //sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32 |
| //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) |
| //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 |
| //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) |
| //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 |
| //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 |
| //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 |
| //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT |
| |
| //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) |
| |
| func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { |
| page := uintptr(offset / 4096) |
| if offset != int64(page)*4096 { |
| return 0, EINVAL |
| } |
| return mmap2(addr, length, prot, flags, fd, page) |
| } |
| |
| type rlimit32 struct { |
| Cur uint32 |
| Max uint32 |
| } |
| |
| //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT |
| |
| const rlimInf32 = ^uint32(0) |
| const rlimInf64 = ^uint64(0) |
| |
| func Getrlimit(resource int, rlim *Rlimit) (err error) { |
| err = prlimit(0, resource, nil, rlim) |
| if err != ENOSYS { |
| return err |
| } |
| |
| rl := rlimit32{} |
| err = getrlimit(resource, &rl) |
| if err != nil { |
| return |
| } |
| |
| if rl.Cur == rlimInf32 { |
| rlim.Cur = rlimInf64 |
| } else { |
| rlim.Cur = uint64(rl.Cur) |
| } |
| |
| if rl.Max == rlimInf32 { |
| rlim.Max = rlimInf64 |
| } else { |
| rlim.Max = uint64(rl.Max) |
| } |
| return |
| } |
| |
| //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT |
| |
| func Setrlimit(resource int, rlim *Rlimit) (err error) { |
| err = prlimit(0, resource, rlim, nil) |
| if err != ENOSYS { |
| return err |
| } |
| |
| rl := rlimit32{} |
| if rlim.Cur == rlimInf64 { |
| rl.Cur = rlimInf32 |
| } else if rlim.Cur < uint64(rlimInf32) { |
| rl.Cur = uint32(rlim.Cur) |
| } else { |
| return EINVAL |
| } |
| if rlim.Max == rlimInf64 { |
| rl.Max = rlimInf32 |
| } else if rlim.Max < uint64(rlimInf32) { |
| rl.Max = uint32(rlim.Max) |
| } else { |
| return EINVAL |
| } |
| |
| return setrlimit(resource, &rl) |
| } |
| |
| // Underlying system call writes to newoffset via pointer. |
| // Implemented in assembly to avoid allocation. |
| func seek(fd int, offset int64, whence int) (newoffset int64, err Errno) |
| |
| func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { |
| newoffset, errno := seek(fd, offset, whence) |
| if errno != 0 { |
| return 0, errno |
| } |
| return newoffset, nil |
| } |
| |
| // Vsyscalls on amd64. |
| //sysnb Gettimeofday(tv *Timeval) (err error) |
| //sysnb Time(t *Time_t) (tt Time_t, err error) |
| |
| // On x86 Linux, all the socket calls go through an extra indirection, |
| // I think because the 5-register system call interface can't handle |
| // the 6-argument calls like sendto and recvfrom. Instead the |
| // arguments to the underlying system call are the number below |
| // and a pointer to an array of uintptr. We hide the pointer in the |
| // socketcall assembly to avoid allocation on every system call. |
| |
| const ( |
| // see linux/net.h |
| _SOCKET = 1 |
| _BIND = 2 |
| _CONNECT = 3 |
| _LISTEN = 4 |
| _ACCEPT = 5 |
| _GETSOCKNAME = 6 |
| _GETPEERNAME = 7 |
| _SOCKETPAIR = 8 |
| _SEND = 9 |
| _RECV = 10 |
| _SENDTO = 11 |
| _RECVFROM = 12 |
| _SHUTDOWN = 13 |
| _SETSOCKOPT = 14 |
| _GETSOCKOPT = 15 |
| _SENDMSG = 16 |
| _RECVMSG = 17 |
| _ACCEPT4 = 18 |
| _RECVMMSG = 19 |
| _SENDMMSG = 20 |
| ) |
| |
| func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) |
| func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) |
| |
| func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { |
| fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { |
| fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { |
| _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { |
| _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { |
| _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { |
| _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { |
| _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func socket(domain int, typ int, proto int) (fd int, err error) { |
| fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { |
| _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { |
| _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { |
| var base uintptr |
| if len(p) > 0 { |
| base = uintptr(unsafe.Pointer(&p[0])) |
| } |
| n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { |
| var base uintptr |
| if len(p) > 0 { |
| base = uintptr(unsafe.Pointer(&p[0])) |
| } |
| _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { |
| n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { |
| n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func Listen(s int, n int) (err error) { |
| _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func Shutdown(s, how int) (err error) { |
| _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func Fstatfs(fd int, buf *Statfs_t) (err error) { |
| _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func Statfs(path string, buf *Statfs_t) (err error) { |
| pathp, err := BytePtrFromString(path) |
| if err != nil { |
| return err |
| } |
| _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) |
| use(unsafe.Pointer(pathp)) |
| if e != 0 { |
| err = e |
| } |
| return |
| } |
| |
| func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } |
| |
| func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } |
| |
| func (iov *Iovec) SetLen(length int) { |
| iov.Len = uint32(length) |
| } |
| |
| func (msghdr *Msghdr) SetControllen(length int) { |
| msghdr.Controllen = uint32(length) |
| } |
| |
| func (cmsg *Cmsghdr) SetLen(length int) { |
| cmsg.Len = uint32(length) |
| } |