/
file.go
94 lines (82 loc) · 1.71 KB
/
file.go
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package file
import (
"os"
"syscall"
"fmt"
)
type File struct {
fd int
name string
}
func newFile(fd int, name string) *File {
if fd < 0 {
return nil
}
return &File{fd,name}
}
func OpenFile(name string, mode int, perm uint32) (file *File, err os.Error) {
r, e := syscall.Open(name, mode, perm)
if e != 0 {
err = os.Errno(e)
}
return newFile(r, name), err
}
const (
O_RDONLY = syscall.O_RDONLY
O_RDWR = syscall.O_RDWR
O_CREATE = syscall.O_CREAT
O_TRUNC = syscall.O_TRUNC
)
func Open(name string) (file *File, err os.Error) {
return OpenFile(name, O_RDONLY, 0)
}
func Create(name string) (file *File, err os.Error) {
return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
}
func (file *File) Close() os.Error {
if file == nil {
return os.EINVAL
}
fmt.Printf("file.Close()\n");
e := syscall.Close(file.fd)
file.fd = -1 // so it can't be closed again
if e != 0 {
return os.Errno(e)
}
return nil
}
func (file *File) Read(b []byte) (ret int, err os.Error) {
if file == nil {
return -1, os.EINVAL
}
r, e := syscall.Read(file.fd, b)
fmt.Printf("file.Read() read: %d bytes\n", r);
if e != 0 {
err = os.Errno(e)
}
return int(r), err
}
func (file *File) Write(b []byte) (ret int, err os.Error) {
if file == nil {
return -1, os.EINVAL
}
r, e := syscall.Write(file.fd, b)
if e != 0 {
err = os.Errno(e)
}
return int(r), err
}
func (file *File) Seek(offset int64, whence int) (ret int, err os.Error) {
if file == nil {
return -1, os.EINVAL
}
fmt.Printf("file.Seek(%d,%d)\n", offset, whence);
r, e := syscall.Seek(file.fd, offset, whence)
if e != 0 {
err = os.Errno(e)
}
return int(r), err
}
func (file *File) String() string {
return file.name
}