Imported Upstream version 60upstream/60

1 files changed, 226 insertions, 0 deletions

diff --git a/src/pkg/os/file_posix.go b/src/pkg/os/file_posix.go
new file mode 100644
index 000000000..0791a0dc0
--- /dev/null
+++ b/src/pkg/os/file_posix.go
@@ -0,0 +1,226 @@
+// 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 (
+	"syscall"
+)
+
+func sigpipe() // implemented in package runtime
+
+func epipecheck(file *File, e int) {
+	if e == syscall.EPIPE {
+		file.nepipe++
+		if file.nepipe >= 10 {
+			sigpipe()
+		}
+	} else {
+		file.nepipe = 0
+	}
+}
+
+// Stat returns a FileInfo structure 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.
+func Stat(name string) (fi *FileInfo, err Error) {
+	var lstat, stat syscall.Stat_t
+	e := syscall.Lstat(name, &lstat)
+	if iserror(e) {
+		return nil, &PathError{"stat", name, Errno(e)}
+	}
+	statp := &lstat
+	if lstat.Mode&syscall.S_IFMT == syscall.S_IFLNK {
+		e := syscall.Stat(name, &stat)
+		if !iserror(e) {
+			statp = &stat
+		}
+	}
+	return fileInfoFromStat(name, new(FileInfo), &lstat, statp), nil
+}
+
+// Lstat returns the FileInfo structure describing the named file and an
+// error, if any.  If the file is a symbolic link, the returned FileInfo
+// describes the symbolic link.  Lstat makes no attempt to follow the link.
+func Lstat(name string) (fi *FileInfo, err Error) {
+	var stat syscall.Stat_t
+	e := syscall.Lstat(name, &stat)
+	if iserror(e) {
+		return nil, &PathError{"lstat", name, Errno(e)}
+	}
+	return fileInfoFromStat(name, new(FileInfo), &stat, &stat), nil
+}
+
+// Remove removes the named file or directory.
+func Remove(name string) Error {
+	// System call interface forces us to know
+	// whether name is a file or directory.
+	// Try both: it is cheaper on average than
+	// doing a Stat plus the right one.
+	e := syscall.Unlink(name)
+	if !iserror(e) {
+		return nil
+	}
+	e1 := syscall.Rmdir(name)
+	if !iserror(e1) {
+		return nil
+	}
+
+	// Both failed: figure out which error to return.
+	// OS X and Linux differ on whether unlink(dir)
+	// returns EISDIR, so can't use that.  However,
+	// both agree that rmdir(file) returns ENOTDIR,
+	// so we can use that to decide which error is real.
+	// Rmdir might also return ENOTDIR if given a bad
+	// file path, like /etc/passwd/foo, but in that case,
+	// both errors will be ENOTDIR, so it's okay to
+	// use the error from unlink.
+	// For windows syscall.ENOTDIR is set
+	// to syscall.ERROR_DIRECTORY, hopefully it should
+	// do the trick.
+	if e1 != syscall.ENOTDIR {
+		e = e1
+	}
+	return &PathError{"remove", name, Errno(e)}
+}
+
+// LinkError records an error during a link or symlink or rename
+// system call and the paths that caused it.
+type LinkError struct {
+	Op    string
+	Old   string
+	New   string
+	Error Error
+}
+
+func (e *LinkError) String() string {
+	return e.Op + " " + e.Old + " " + e.New + ": " + e.Error.String()
+}
+
+// Link creates a hard link.
+func Link(oldname, newname string) Error {
+	e := syscall.Link(oldname, newname)
+	if iserror(e) {
+		return &LinkError{"link", oldname, newname, Errno(e)}
+	}
+	return nil
+}
+
+// Symlink creates a symbolic link.
+func Symlink(oldname, newname string) Error {
+	e := syscall.Symlink(oldname, newname)
+	if iserror(e) {
+		return &LinkError{"symlink", oldname, newname, Errno(e)}
+	}
+	return nil
+}
+
+// Readlink reads the contents of a symbolic link: the destination of
+// the link.  It returns the contents and an Error, if any.
+func Readlink(name string) (string, Error) {
+	for len := 128; ; len *= 2 {
+		b := make([]byte, len)
+		n, e := syscall.Readlink(name, b)
+		if iserror(e) {
+			return "", &PathError{"readlink", name, Errno(e)}
+		}
+		if n < len {
+			return string(b[0:n]), nil
+		}
+	}
+	// Silence 6g.
+	return "", nil
+}
+
+// Rename renames a file.
+func Rename(oldname, newname string) Error {
+	e := syscall.Rename(oldname, newname)
+	if iserror(e) {
+		return &LinkError{"rename", oldname, newname, Errno(e)}
+	}
+	return nil
+}
+
+// Chmod changes the mode of the named file to mode.
+// If the file is a symbolic link, it changes the mode of the link's target.
+func Chmod(name string, mode uint32) Error {
+	if e := syscall.Chmod(name, mode); iserror(e) {
+		return &PathError{"chmod", name, Errno(e)}
+	}
+	return nil
+}
+
+// Chmod changes the mode of the file to mode.
+func (f *File) Chmod(mode uint32) Error {
+	if e := syscall.Fchmod(f.fd, mode); iserror(e) {
+		return &PathError{"chmod", f.name, Errno(e)}
+	}
+	return nil
+}
+
+// Chown changes the numeric uid and gid of the named file.
+// If the file is a symbolic link, it changes the uid and gid of the link's target.
+func Chown(name string, uid, gid int) Error {
+	if e := syscall.Chown(name, uid, gid); iserror(e) {
+		return &PathError{"chown", name, Errno(e)}
+	}
+	return nil
+}
+
+// Lchown changes the numeric uid and gid of the named file.
+// If the file is a symbolic link, it changes the uid and gid of the link itself.
+func Lchown(name string, uid, gid int) Error {
+	if e := syscall.Lchown(name, uid, gid); iserror(e) {
+		return &PathError{"lchown", name, Errno(e)}
+	}
+	return nil
+}
+
+// Chown changes the numeric uid and gid of the named file.
+func (f *File) Chown(uid, gid int) Error {
+	if e := syscall.Fchown(f.fd, uid, gid); iserror(e) {
+		return &PathError{"chown", f.name, Errno(e)}
+	}
+	return nil
+}
+
+// Truncate changes the size of the file.
+// It does not change the I/O offset.
+func (f *File) Truncate(size int64) Error {
+	if e := syscall.Ftruncate(f.fd, size); iserror(e) {
+		return &PathError{"truncate", f.name, Errno(e)}
+	}
+	return nil
+}
+
+// Sync commits the current contents of the file to stable storage.
+// Typically, this means flushing the file system's in-memory copy
+// of recently written data to disk.
+func (file *File) Sync() (err Error) {
+	if file == nil {
+		return EINVAL
+	}
+	if e := syscall.Fsync(file.fd); iserror(e) {
+		return NewSyscallError("fsync", e)
+	}
+	return nil
+}
+
+// Chtimes changes the access and modification times of the named
+// file, similar to the Unix utime() or utimes() functions.
+//
+// The argument times are in nanoseconds, although the underlying
+// filesystem may truncate or round the values to a more
+// coarse time unit.
+func Chtimes(name string, atime_ns int64, mtime_ns int64) Error {
+	var utimes [2]syscall.Timeval
+	utimes[0] = syscall.NsecToTimeval(atime_ns)
+	utimes[1] = syscall.NsecToTimeval(mtime_ns)
+	if e := syscall.Utimes(name, utimes[0:]); iserror(e) {
+		return &PathError{"chtimes", name, Errno(e)}
+	}
+	return nil
+}