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// 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.
package os
import (
"os";
"syscall";
)
// Auxiliary information if the FD describes a directory
type dirInfo struct { // TODO(r): 6g bug means this can't be private
buf []byte; // buffer for directory I/O
nbuf int64; // length of buf; return value from Getdirentries
bufp int64; // location of next record in buf.
}
// FDs are wrappers for file descriptors
type FD struct {
fd int64;
name string;
dirinfo *dirInfo; // nil unless directory being read
}
func (fd *FD) Fd() int64 {
return fd.fd
}
func (fd *FD) Name() string {
return fd.name
}
func NewFD(fd int64, name string) *FD {
if fd < 0 {
return nil
}
return &FD(fd, name, nil)
}
var (
Stdin = NewFD(0, "/dev/stdin");
Stdout = NewFD(1, "/dev/stdout");
Stderr = NewFD(2, "/dev/stderr");
)
const (
O_RDONLY = syscall.O_RDONLY;
O_WRONLY = syscall.O_WRONLY;
O_RDWR = syscall.O_RDWR;
O_APPEND = syscall.O_APPEND;
O_ASYNC = syscall.O_ASYNC;
O_CREAT = syscall.O_CREAT;
O_NOCTTY = syscall.O_NOCTTY;
O_NONBLOCK = syscall.O_NONBLOCK;
O_NDELAY = O_NONBLOCK;
O_SYNC = syscall.O_SYNC;
O_TRUNC = syscall.O_TRUNC;
)
func Open(name string, mode int, flags int) (fd *FD, err *Error) {
r, e := syscall.Open(name, int64(mode), int64(flags | syscall.O_CLOEXEC));
if e != 0 {
return nil, ErrnoToError(e);
}
// There's a race here with fork/exec, which we are
// content to live with. See ../syscall/exec.go
if syscall.O_CLOEXEC == 0 { // O_CLOEXEC not supported
syscall.CloseOnExec(r);
}
return NewFD(r, name), ErrnoToError(e)
}
func (fd *FD) Close() *Error {
if fd == nil {
return EINVAL
}
r, e := syscall.Close(fd.fd);
fd.fd = -1; // so it can't be closed again
return ErrnoToError(e)
}
func (fd *FD) Read(b []byte) (ret int, err *Error) {
if fd == nil {
return 0, EINVAL
}
var r, e int64;
if len(b) > 0 { // because we access b[0]
r, e = syscall.Read(fd.fd, &b[0], int64(len(b)));
if r < 0 {
r = 0
}
}
return int(r), ErrnoToError(e)
}
func (fd *FD) Write(b []byte) (ret int, err *Error) {
if fd == nil {
return 0, EINVAL
}
var r, e int64;
if len(b) > 0 { // because we access b[0]
r, e = syscall.Write(fd.fd, &b[0], int64(len(b)));
if r < 0 {
r = 0
}
}
return int(r), ErrnoToError(e)
}
func (fd *FD) Seek(offset int64, whence int) (ret int64, err *Error) {
r, e := syscall.Seek(fd.fd, offset, int64(whence));
if e != 0 {
return -1, ErrnoToError(e)
}
if fd.dirinfo != nil && r != 0 {
return -1, ErrnoToError(syscall.EISDIR)
}
return r, nil
}
func (fd *FD) WriteString(s string) (ret int, err *Error) {
if fd == nil {
return 0, EINVAL
}
r, e := syscall.Write(fd.fd, syscall.StringBytePtr(s), int64(len(s)));
if r < 0 {
r = 0
}
return int(r), ErrnoToError(e)
}
func Pipe() (fd1 *FD, fd2 *FD, err *Error) {
var p [2]int64;
// See ../syscall/exec.go for description of lock.
syscall.ForkLock.RLock();
r, e := syscall.Pipe(&p);
if e != 0 {
syscall.ForkLock.RUnlock();
return nil, nil, ErrnoToError(e)
}
syscall.CloseOnExec(p[0]);
syscall.CloseOnExec(p[1]);
syscall.ForkLock.RUnlock();
return NewFD(p[0], "|0"), NewFD(p[1], "|1"), nil
}
func Mkdir(name string, perm int) *Error {
r, e := syscall.Mkdir(name, int64(perm));
return ErrnoToError(e)
}
func Stat(name string) (dir *Dir, err *Error) {
stat := new(syscall.Stat_t);
r, e := syscall.Stat(name, stat);
if e != 0 {
return nil, ErrnoToError(e)
}
return dirFromStat(name, new(Dir), stat), nil
}
func Fstat(fd *FD) (dir *Dir, err *Error) {
stat := new(syscall.Stat_t);
r, e := syscall.Fstat(fd.fd, stat);
if e != 0 {
return nil, ErrnoToError(e)
}
return dirFromStat(fd.name, new(Dir), stat), nil
}
func Lstat(name string) (dir *Dir, err *Error) {
stat := new(syscall.Stat_t);
r, e := syscall.Lstat(name, stat);
if e != 0 {
return nil, ErrnoToError(e)
}
return dirFromStat(name, new(Dir), stat), nil
}
// Non-portable function defined in operating-system-dependent file.
func Readdirnames(fd *FD, count int) (names []string, err *os.Error)
// Negative count means read until EOF.
func Readdir(fd *FD, count int) (dirs []Dir, err *os.Error) {
dirname := fd.name;
if dirname == "" {
dirname = ".";
}
dirname += "/";
names, err1 := Readdirnames(fd, count);
if err1 != nil {
return nil, err1
}
dirs = make([]Dir, len(names));
for i, filename := range names {
dirp, err := Stat(dirname + filename);
if dirp == nil || err != nil {
dirs[i].Name = filename // rest is already zeroed out
} else {
dirs[i] = *dirp
}
}
return
}
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