crashpad::WeakFileHandleFileWriter Class Reference

A file writer backed by a FileHandle. More...

`#include "util/file/file_writer.h"`

Inheritance diagram for crashpad::WeakFileHandleFileWriter:

## Public Member Functions

| WeakFileHandleFileWriter (FileHandle file_handle)
bool | Write (const void *data, size_t size) override
| Wraps LoggingWriteFile(), or provides an implementation with identical semantics. More...
bool | WriteIoVec (std::vector< WritableIoVec > *iovecs) override
| Wraps `writev()` on POSIX or provides an alternate implementation with identical semantics. This method will write entire buffers, continuing after a short write or after being interrupted. On non-POSIX this is a simple wrapper around Write(). More...
FileOffset | Seek (FileOffset offset, int whence) override
| Wraps LoggingSeekFile() or provides an alternate implementation with identical semantics. More...
Public Member Functions inherited from crashpad::FileSeekerInterface
FileOffset | SeekGet ()
| Wraps Seek(), using `SEEK_CUR` to obtain the file’s current position. More...
bool | SeekSet (FileOffset offset)
| Wraps Seek(), using `SEEK_SET`, ensuring that the seek succeeded and the file is positioned as desired. More...

## Friends

class | FileWriter

## Detailed Description

A file writer backed by a FileHandle.

FileWriter requires users to provide a FilePath to open, but this class accepts an already-open FileHandle instead. Like FileWriter, this class may write to a filesystem-based file, but unlike FileWriter, this class is not responsible for creating or closing the file. Users of this class must ensure that the file handle is closed appropriately elsewhere. Objects of this class may be used to write to file handles not associated with filesystem-based files, although special attention should be paid to the Seek() method, which may not function on file handles that do not refer to disk-based files.

This class is expected to be used when other code is responsible for creating files and already provides file handles.

## Member Function Documentation

## Seek()

FileOffset crashpad::WeakFileHandleFileWriter::Seek | ( | FileOffset | offset,
|  | int | whence
| ) |  |

overridevirtual

Wraps LoggingSeekFile() or provides an alternate implementation with identical semantics.

Returns
  The return value of LoggingSeekFile(). `-1` on failure, with an error message logged.

Note
  This method is only guaranteed to function on file handles referring to disk-based files.

Implements crashpad::FileSeekerInterface.

## Write()

bool crashpad::WeakFileHandleFileWriter::Write | ( | const void * | data,
|  | size_t | size
| ) |  |

overridevirtual

Wraps LoggingWriteFile(), or provides an implementation with identical semantics.

Returns
  `true` if the operation succeeded, `false` if it failed, with an error message logged.

Implements crashpad::FileWriterInterface.

## WriteIoVec()

bool crashpad::WeakFileHandleFileWriter::WriteIoVec | ( | std::vector< WritableIoVec > * | iovecs | ) |

overridevirtual

Wraps `writev()` on POSIX or provides an alternate implementation with identical semantics. This method will write entire buffers, continuing after a short write or after being interrupted. On non-POSIX this is a simple wrapper around Write().

Returns
  `true` if the operation succeeded, `false` if it failed, with an error message logged.

Note
  The contents of iovecs are undefined when this method returns.

Implements crashpad::FileWriterInterface.

The documentation for this class was generated from the following files:

- util/file/file_writer.h
- util/file/file_writer.cc