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Diffstat (limited to 'src/pkg/os/file_plan9.go')
-rw-r--r--src/pkg/os/file_plan9.go148
1 files changed, 89 insertions, 59 deletions
diff --git a/src/pkg/os/file_plan9.go b/src/pkg/os/file_plan9.go
index 1e94fb715..7d136eb36 100644
--- a/src/pkg/os/file_plan9.go
+++ b/src/pkg/os/file_plan9.go
@@ -7,10 +7,19 @@ package os
import (
"runtime"
"syscall"
+ "time"
)
// File represents an open file descriptor.
type File struct {
+ *file
+}
+
+// file is the real representation of *File.
+// The extra level of indirection ensures that no clients of os
+// can overwrite this data, which could cause the finalizer
+// to close the wrong file descriptor.
+type file struct {
fd int
name string
dirinfo *dirInfo // nil unless directory being read
@@ -29,8 +38,8 @@ func NewFile(fd int, name string) *File {
if fd < 0 {
return nil
}
- f := &File{fd: fd, name: name}
- runtime.SetFinalizer(f, (*File).Close)
+ f := &File{&file{fd: fd, name: name}}
+ runtime.SetFinalizer(f.file, (*file).close)
return f
}
@@ -41,22 +50,37 @@ type dirInfo struct {
bufp int // location of next record in buf.
}
-func epipecheck(file *File, e syscall.Error) {
+func epipecheck(file *File, e error) {
}
// 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"
+// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
+func syscallMode(i FileMode) (o uint32) {
+ o |= uint32(i.Perm())
+ if i&ModeAppend != 0 {
+ o |= syscall.DMAPPEND
+ }
+ if i&ModeExclusive != 0 {
+ o |= syscall.DMEXCL
+ }
+ if i&ModeTemporary != 0 {
+ o |= syscall.DMTMP
+ }
+ return
+}
+
// OpenFile is the generalized open call; most users will use Open
// 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.
-func OpenFile(name string, flag int, perm uint32) (file *File, err Error) {
+// It returns the File and an error, if any.
+func OpenFile(name string, flag int, perm FileMode) (file *File, err error) {
var (
fd int
- e syscall.Error
+ e error
create bool
excl bool
trunc bool
@@ -81,12 +105,12 @@ func OpenFile(name string, flag int, perm uint32) (file *File, err Error) {
syscall.ForkLock.RLock()
if (create && trunc) || excl {
- fd, e = syscall.Create(name, flag, perm)
+ fd, e = syscall.Create(name, flag, syscallMode(perm))
} else {
fd, e = syscall.Open(name, flag)
if e != nil && create {
- var e1 syscall.Error
- fd, e1 = syscall.Create(name, flag, perm)
+ var e1 error
+ fd, e1 = syscall.Create(name, flag, syscallMode(perm))
if e1 == nil {
e = nil
}
@@ -108,12 +132,16 @@ func OpenFile(name string, flag int, perm uint32) (file *File, err Error) {
}
// Close closes the File, rendering it unusable for I/O.
-// It returns an Error, if any.
-func (file *File) Close() Error {
+// It returns an error, if any.
+func (file *File) Close() error {
+ return file.file.close()
+}
+
+func (file *file) close() error {
if file == nil || file.fd < 0 {
return Ebadfd
}
- var err Error
+ var err error
syscall.ForkLock.RLock()
if e := syscall.Close(file.fd); e != nil {
err = &PathError{"close", file.name, e}
@@ -128,41 +156,41 @@ func (file *File) Close() Error {
// Stat returns the FileInfo structure describing file.
// It returns the FileInfo and an error, if any.
-func (f *File) Stat() (fi *FileInfo, err Error) {
+func (f *File) Stat() (FileInfo, error) {
d, err := dirstat(f)
- if iserror(err) {
+ if err != nil {
return nil, err
}
- return fileInfoFromStat(new(FileInfo), d), err
+ return fileInfoFromStat(d), nil
}
// Truncate changes the size of the file.
// It does not change the I/O offset.
-func (f *File) Truncate(size int64) Error {
+func (f *File) Truncate(size int64) error {
var d Dir
d.Null()
d.Length = uint64(size)
- if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+ if e := syscall.Fwstat(f.fd, pdir(nil, &d)); e != nil {
return &PathError{"truncate", f.name, e}
}
return nil
}
+const chmodMask = uint32(syscall.DMAPPEND | syscall.DMEXCL | syscall.DMTMP | ModePerm)
+
// Chmod changes the mode of the file to mode.
-func (f *File) Chmod(mode uint32) Error {
+func (f *File) Chmod(mode FileMode) error {
var d Dir
- var mask = ^uint32(0777)
- d.Null()
odir, e := dirstat(f)
- if iserror(e) {
+ if e != nil {
return &PathError{"chmod", f.name, e}
}
-
- d.Mode = (odir.Mode & mask) | (mode &^ mask)
- if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+ d.Null()
+ d.Mode = odir.Mode&^chmodMask | syscallMode(mode)&chmodMask
+ if e := syscall.Fwstat(f.fd, pdir(nil, &d)); e != nil {
return &PathError{"chmod", f.name, e}
}
return nil
@@ -171,7 +199,7 @@ func (f *File) Chmod(mode uint32) Error {
// 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 (f *File) Sync() (err Error) {
+func (f *File) Sync() (err error) {
if f == nil {
return EINVAL
}
@@ -179,7 +207,7 @@ func (f *File) Sync() (err Error) {
var d Dir
d.Null()
- if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+ if e := syscall.Fwstat(f.fd, pdir(nil, &d)); e != nil {
return NewSyscallError("fsync", e)
}
return nil
@@ -187,26 +215,26 @@ func (f *File) Sync() (err Error) {
// read reads up to len(b) bytes from the File.
// It returns the number of bytes read and an error, if any.
-func (f *File) read(b []byte) (n int, err syscall.Error) {
+func (f *File) read(b []byte) (n int, err error) {
return syscall.Read(f.fd, b)
}
// pread reads len(b) bytes from the File starting at byte offset off.
// It returns the number of bytes read and the error, if any.
// EOF is signaled by a zero count with err set to nil.
-func (f *File) pread(b []byte, off int64) (n int, err syscall.Error) {
+func (f *File) pread(b []byte, off int64) (n int, err error) {
return syscall.Pread(f.fd, b, off)
}
// 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 syscall.Error) {
+func (f *File) write(b []byte) (n int, err error) {
return syscall.Write(f.fd, b)
}
// pwrite writes len(b) bytes to the File starting at byte offset off.
// It returns the number of bytes written and an error, if any.
-func (f *File) pwrite(b []byte, off int64) (n int, err syscall.Error) {
+func (f *File) pwrite(b []byte, off int64) (n int, err error) {
return syscall.Pwrite(f.fd, b, off)
}
@@ -214,58 +242,56 @@ func (f *File) pwrite(b []byte, off int64) (n int, err syscall.Error) {
// according to whence: 0 means relative to the origin of the file, 1 means
// relative to the current offset, and 2 means relative to the end.
// It returns the new offset and an error, if any.
-func (f *File) seek(offset int64, whence int) (ret int64, err syscall.Error) {
+func (f *File) seek(offset int64, whence int) (ret int64, err error) {
return syscall.Seek(f.fd, offset, whence)
}
// Truncate changes the size of the named file.
// If the file is a symbolic link, it changes the size of the link's target.
-func Truncate(name string, size int64) Error {
+func Truncate(name string, size int64) error {
var d Dir
d.Null()
d.Length = uint64(size)
- if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+ if e := syscall.Wstat(name, pdir(nil, &d)); e != nil {
return &PathError{"truncate", name, e}
}
return nil
}
// Remove removes the named file or directory.
-func Remove(name string) Error {
- if e := syscall.Remove(name); iserror(e) {
+func Remove(name string) error {
+ if e := syscall.Remove(name); e != nil {
return &PathError{"remove", name, e}
}
return nil
}
// Rename renames a file.
-func Rename(oldname, newname string) Error {
+func Rename(oldname, newname string) error {
var d Dir
d.Null()
d.Name = newname
- if e := syscall.Wstat(oldname, pdir(nil, &d)); iserror(e) {
+ if e := syscall.Wstat(oldname, pdir(nil, &d)); e != nil {
return &PathError{"rename", oldname, e}
}
return nil
}
// Chmod changes the mode of the named file to mode.
-func Chmod(name string, mode uint32) Error {
+func Chmod(name string, mode FileMode) error {
var d Dir
- var mask = ^uint32(0777)
- d.Null()
odir, e := dirstat(name)
- if iserror(e) {
+ if e != nil {
return &PathError{"chmod", name, e}
}
-
- d.Mode = (odir.Mode & mask) | (mode &^ mask)
- if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+ d.Null()
+ d.Mode = odir.Mode&^chmodMask | syscallMode(mode)&chmodMask
+ if e := syscall.Wstat(name, pdir(nil, &d)); e != nil {
return &PathError{"chmod", name, e}
}
return nil
@@ -274,27 +300,26 @@ func Chmod(name string, mode uint32) Error {
// 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, atimeNs int64, mtimeNs int64) Error {
+// The underlying filesystem may truncate or round the values to a
+// less precise time unit.
+func Chtimes(name string, atime time.Time, mtime time.Time) error {
var d Dir
d.Null()
- d.Atime = uint32(atimeNs / 1e9)
- d.Mtime = uint32(mtimeNs / 1e9)
+ d.Atime = uint32(atime.Unix())
+ d.Mtime = uint32(mtime.Unix())
- if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+ if e := syscall.Wstat(name, pdir(nil, &d)); e != nil {
return &PathError{"chtimes", name, e}
}
return nil
}
-func Pipe() (r *File, w *File, err Error) {
+func Pipe() (r *File, w *File, err error) {
var p [2]int
syscall.ForkLock.RLock()
- if e := syscall.Pipe(p[0:]); iserror(e) {
+ if e := syscall.Pipe(p[0:]); e != nil {
syscall.ForkLock.RUnlock()
return nil, nil, NewSyscallError("pipe", e)
}
@@ -306,26 +331,31 @@ func Pipe() (r *File, w *File, err Error) {
// not supported on Plan 9
// Link creates a hard link.
-func Link(oldname, newname string) Error {
+func Link(oldname, newname string) error {
return EPLAN9
}
-func Symlink(oldname, newname string) Error {
+func Symlink(oldname, newname string) error {
return EPLAN9
}
-func Readlink(name string) (string, Error) {
+func Readlink(name string) (string, error) {
return "", EPLAN9
}
-func Chown(name string, uid, gid int) Error {
+func Chown(name string, uid, gid int) error {
return EPLAN9
}
-func Lchown(name string, uid, gid int) Error {
+func Lchown(name string, uid, gid int) error {
return EPLAN9
}
-func (f *File) Chown(uid, gid int) Error {
+func (f *File) Chown(uid, gid int) error {
return EPLAN9
}
+
+// TempDir returns the default directory to use for temporary files.
+func TempDir() string {
+ return "/tmp"
+}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-12 23:19:06 +0000