diff options
Diffstat (limited to 'src/pkg/os/file_posix.go')
| -rw-r--r-- | src/pkg/os/file_posix.go | 198 |
1 files changed, 74 insertions, 124 deletions
diff --git a/src/pkg/os/file_posix.go b/src/pkg/os/file_posix.go index 0791a0dc0..073bd56a4 100644 --- a/src/pkg/os/file_posix.go +++ b/src/pkg/os/file_posix.go @@ -2,15 +2,18 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. +// +build darwin freebsd linux netbsd openbsd windows + package os import ( "syscall" + "time" ) func sigpipe() // implemented in package runtime -func epipecheck(file *File, e int) { +func epipecheck(file *File, e error) { if e == syscall.EPIPE { file.nepipe++ if file.nepipe >= 10 { @@ -21,111 +24,34 @@ func epipecheck(file *File, e int) { } } -// 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 { +// Link creates newname as a hard link to the oldname file. +// If there is an error, it will be of type *LinkError. +func Link(oldname, newname string) error { e := syscall.Link(oldname, newname) - if iserror(e) { - return &LinkError{"link", oldname, newname, Errno(e)} + if e != nil { + return &LinkError{"link", oldname, newname, e} } return nil } -// Symlink creates a symbolic link. -func Symlink(oldname, newname string) Error { +// Symlink creates newname as a symbolic link to oldname. +// If there is an error, it will be of type *LinkError. +func Symlink(oldname, newname string) error { e := syscall.Symlink(oldname, newname) - if iserror(e) { - return &LinkError{"symlink", oldname, newname, Errno(e)} + if e != nil { + return &LinkError{"symlink", oldname, newname, 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) { +// Readlink returns the destination of the named symbolic link. +// If there is an error, it will be of type *PathError. +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 e != nil { + return "", &PathError{"readlink", name, e} } if n < len { return string(b[0:n]), nil @@ -136,62 +62,84 @@ func Readlink(name string) (string, Error) { } // Rename renames a file. -func Rename(oldname, newname string) Error { +func Rename(oldname, newname string) error { e := syscall.Rename(oldname, newname) - if iserror(e) { - return &LinkError{"rename", oldname, newname, Errno(e)} + if e != nil { + return &LinkError{"rename", oldname, newname, e} } return nil } +// 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&ModeSetuid != 0 { + o |= syscall.S_ISUID + } + if i&ModeSetgid != 0 { + o |= syscall.S_ISGID + } + if i&ModeSticky != 0 { + o |= syscall.S_ISVTX + } + // No mapping for Go's ModeTemporary (plan9 only). + return +} + // 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)} +// If there is an error, it will be of type *PathError. +func Chmod(name string, mode FileMode) error { + if e := syscall.Chmod(name, syscallMode(mode)); e != nil { + return &PathError{"chmod", name, 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)} +// If there is an error, it will be of type *PathError. +func (f *File) Chmod(mode FileMode) error { + if e := syscall.Fchmod(f.fd, syscallMode(mode)); e != nil { + return &PathError{"chmod", f.name, 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)} +// If there is an error, it will be of type *PathError. +func Chown(name string, uid, gid int) error { + if e := syscall.Chown(name, uid, gid); e != nil { + return &PathError{"chown", name, 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)} +// If there is an error, it will be of type *PathError. +func Lchown(name string, uid, gid int) error { + if e := syscall.Lchown(name, uid, gid); e != nil { + return &PathError{"lchown", name, 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)} +// If there is an error, it will be of type *PathError. +func (f *File) Chown(uid, gid int) error { + if e := syscall.Fchown(f.fd, uid, gid); e != nil { + return &PathError{"chown", f.name, 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)} +// If there is an error, it will be of type *PathError. +func (f *File) Truncate(size int64) error { + if e := syscall.Ftruncate(f.fd, size); e != nil { + return &PathError{"truncate", f.name, e} } return nil } @@ -199,11 +147,11 @@ func (f *File) Truncate(size int64) 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 (file *File) Sync() (err Error) { - if file == nil { - return EINVAL +func (f *File) Sync() (err error) { + if f == nil { + return syscall.EINVAL } - if e := syscall.Fsync(file.fd); iserror(e) { + if e := syscall.Fsync(f.fd); e != nil { return NewSyscallError("fsync", e) } return nil @@ -212,15 +160,17 @@ func (file *File) Sync() (err 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, atime_ns int64, mtime_ns int64) Error { +// The underlying filesystem may truncate or round the values to a +// less precise time unit. +// If there is an error, it will be of type *PathError. +func Chtimes(name string, atime time.Time, mtime time.Time) error { var utimes [2]syscall.Timeval + atime_ns := atime.Unix()*1e9 + int64(atime.Nanosecond()) + mtime_ns := mtime.Unix()*1e9 + int64(mtime.Nanosecond()) 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)} + if e := syscall.Utimes(name, utimes[0:]); e != nil { + return &PathError{"chtimes", name, e} } return nil } |