// Close closes the [File], rendering it unusable for I/O. // On files that support [File.SetDeadline], any pending I/O operations will // be canceled and return immediately with an [ErrClosed] error. // Close will return an error if it has already been called. func (f *File) Close() 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 error) { … } // 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 error) { … } // 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) { … } // 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 error) { … } // syscallMode returns the syscall-specific mode bits from Go's portable mode bits. func syscallMode(i FileMode) (o uint32) { … } // See docs in file.go:Chmod. func chmod(name string, mode FileMode) error { … } // See docs in file.go:(*File).Chmod. func (f *File) chmod(mode FileMode) error { … } // 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. // A uid or gid of -1 means to not change that value. // If there is an error, it will be of type [*PathError]. // // On Windows or Plan 9, Chown always returns the [syscall.EWINDOWS] or // EPLAN9 error, wrapped in *PathError. func Chown(name string, uid, gid int) error { … } // 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. // If there is an error, it will be of type [*PathError]. // // On Windows, it always returns the [syscall.EWINDOWS] error, wrapped // in *PathError. func Lchown(name string, uid, gid int) error { … } // Chown changes the numeric uid and gid of the named file. // If there is an error, it will be of type [*PathError]. // // On Windows, it always returns the [syscall.EWINDOWS] error, wrapped // in *PathError. func (f *File) Chown(uid, gid int) error { … } // Truncate changes the size of the file. // It does not change the I/O offset. // If there is an error, it will be of type [*PathError]. 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 (f *File) Sync() error { … } // Chtimes changes the access and modification times of the named // file, similar to the Unix utime() or utimes() functions. // A zero [time.Time] value will leave the corresponding file time unchanged. // // 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 { … } // Chdir changes the current working directory to the file, // which must be a directory. // If there is an error, it will be of type [*PathError]. func (f *File) Chdir() error { … } // setDeadline sets the read and write deadline. func (f *File) setDeadline(t time.Time) error { … } // setReadDeadline sets the read deadline. func (f *File) setReadDeadline(t time.Time) error { … } // setWriteDeadline sets the write deadline. func (f *File) setWriteDeadline(t time.Time) error { … } // checkValid checks whether f is valid for use. // If not, it returns an appropriate error, perhaps incorporating the operation name op. func (f *File) checkValid(op string) error { … } // ignoringEINTR makes a function call and repeats it if it returns an // EINTR error. This appears to be required even though we install all // signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846. // Also #20400 and #36644 are issues in which a signal handler is // installed without setting SA_RESTART. None of these are the common case, // but there are enough of them that it seems that we can't avoid // an EINTR loop. func ignoringEINTR(fn func() error) error { … }
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