import (
"runtime"
+ "sync/atomic"
"syscall"
)
fd int
name string
dirinfo *dirInfo // nil unless directory being read
- nepipe int // number of consecutive EPIPE in Write
+ nepipe int32 // number of consecutive EPIPE in Write
}
// Fd returns the integer Unix file descriptor referencing the open file.
-func (f *File) Fd() int {
+func (f *File) Fd() uintptr {
if f == nil {
- return -1
+ return ^(uintptr(0))
}
- return f.fd
+ return uintptr(f.fd)
}
// NewFile returns a new File with the given file descriptor and name.
-func NewFile(fd int, name string) *File {
- if fd < 0 {
+func NewFile(fd uintptr, name string) *File {
+ fdi := int(fd)
+ if fdi < 0 {
return nil
}
- f := &File{&file{fd: fd, name: name}}
+ f := &File{&file{fd: fdi, name: name}}
runtime.SetFinalizer(f.file, (*file).close)
return f
}
dir *syscall.DIR // from opendir
}
+func epipecheck(file *File, e error) {
+ if e == syscall.EPIPE {
+ if atomic.AddInt32(&file.nepipe, 1) >= 10 {
+ sigpipe()
+ }
+ } else {
+ atomic.StoreInt32(&file.nepipe, 0)
+ }
+}
+
// DevNull is the name of the operating system's ``null device.''
// On Unix-like systems, it is "/dev/null"; on Windows, "NUL".
const DevNull = "/dev/null"
// or Create instead. It opens the named file with specified flag
// (O_RDONLY etc.) and perm, (0666 etc.) if applicable. If successful,
// methods on the returned File can be used for I/O.
-// It returns the File and an error, if any.
+// If there is an error, it will be of type *PathError.
func OpenFile(name string, flag int, perm FileMode) (file *File, err error) {
r, e := syscall.Open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
if e != nil {
syscall.CloseOnExec(r)
}
- return NewFile(r, name), nil
+ return NewFile(uintptr(r), name), nil
}
// Close closes the File, rendering it unusable for I/O.
func (file *file) close() error {
if file == nil || file.fd < 0 {
- return EINVAL
+ return syscall.EINVAL
}
var err error
if e := syscall.Close(file.fd); e != nil {
}
// Stat returns the FileInfo structure describing file.
-// It returns the FileInfo and an error, if any.
+// If there is an error, it will be of type *PathError.
func (f *File) Stat() (fi FileInfo, err error) {
var stat syscall.Stat_t
err = syscall.Fstat(f.fd, &stat)
return fileInfoFromStat(&stat, f.name), nil
}
-// Stat returns a FileInfo describing the named file and an error, if any.
-// If name names a valid symbolic link, the returned FileInfo describes
-// the file pointed at by the link and has fi.FollowedSymlink set to true.
-// If name names an invalid symbolic link, the returned FileInfo describes
-// the link itself and has fi.FollowedSymlink set to false.
+// Stat returns a FileInfo describing the named file.
+// If there is an error, it will be of type *PathError.
func Stat(name string) (fi FileInfo, err error) {
var stat syscall.Stat_t
err = syscall.Stat(name, &stat)
return fileInfoFromStat(&stat, name), nil
}
-// Lstat returns a FileInfo describing the named file and an
-// error, if any. If the file is a symbolic link, the returned FileInfo
+// Lstat returns a FileInfo describing the named file.
+// If the file is a symbolic link, the returned FileInfo
// describes the symbolic link. Lstat makes no attempt to follow the link.
+// If there is an error, it will be of type *PathError.
func Lstat(name string) (fi FileInfo, err error) {
var stat syscall.Stat_t
err = syscall.Lstat(name, &stat)
if err == nil {
fi[i] = fip
} else {
- fi[i] = &FileStat{name: filename}
+ fi[i] = &fileStat{name: filename}
}
}
return fi, err
// write writes len(b) bytes to the File.
// It returns the number of bytes written and an error, if any.
func (f *File) write(b []byte) (n int, err error) {
- return syscall.Write(f.fd, b)
+ for {
+ m, err := syscall.Write(f.fd, b)
+ n += m
+
+ // If the syscall wrote some data but not all (short write)
+ // or it returned EINTR, then assume it stopped early for
+ // reasons that are uninteresting to the caller, and try again.
+ if 0 < m && m < len(b) || err == syscall.EINTR {
+ b = b[m:]
+ continue
+ }
+
+ return n, err
+ }
+ panic("not reached")
}
// pwrite writes len(b) bytes to the File starting at byte offset off.
// Truncate changes the size of the named file.
// If the file is a symbolic link, it changes the size of the link's target.
+// If there is an error, it will be of type *PathError.
func Truncate(name string, size int64) error {
if e := syscall.Truncate(name, size); e != nil {
return &PathError{"truncate", name, e}
}
// Remove removes the named file or directory.
+// If there is an error, it will be of type *PathError.
func Remove(name string) error {
// System call interface forces us to know
// whether name is a file or directory.
syscall.CloseOnExec(p[1])
syscall.ForkLock.RUnlock()
- return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
+ return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
// TempDir returns the default directory to use for temporary files.
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