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Add fsync() and fdatasync() functions

Browse source 
fsync is a straightforward wrapper around the same C function
(implemented on Windows API as _commit() with identical signature).

From the man pages:

    fsync() transfers ("flushes") all modified in-core data of (i.e.,
    modified buffer cache pages for) the file referred to by the file
    descriptor fd to the disk device (or other permanent storage
    device) so that all changed information can be retrieved even if
    the system crashes or is rebooted.  This includes writing through
    or flushing a disk cache if present.  The call blocks until the
    device reports that the transfer has completed.

RFC: https://wiki.php.net/rfc/fsync_function

Closes GH-6650.
This commit is contained in:
David Gebler 2021-04-13 16:04:29 +02:00 • committed by Nikita Popov
parent 0c5711856f
commit cbcfd86026
9 changed files with 259 additions and 1 deletions
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12
main/php_streams.h
View file

@ -334,6 +334,9 @@ PHPAPI int _php_stream_putc(php_stream *stream, int c);
PHPAPI int _php_stream_flush(php_stream *stream, int closing);
#define php_stream_flush(stream) _php_stream_flush((stream), 0)
PHPAPI int _php_stream_sync(php_stream *stream, bool data_only);
#define php_stream_sync(stream, d) _php_stream_sync((stream), (d))
PHPAPI char *_php_stream_get_line(php_stream *stream, char *buf, size_t maxlen, size_t *returned_len);
#define php_stream_gets(stream, buf, maxlen) _php_stream_get_line((stream), (buf), (maxlen), NULL)
@ -442,6 +445,15 @@ END_EXTERN_C()
/* Enable/disable blocking reads on anonymous pipes on Windows. */
#define PHP_STREAM_OPTION_PIPE_BLOCKING 13
/* Stream can support fsync operation */
#define PHP_STREAM_OPTION_SYNC_API 14
#define PHP_STREAM_SYNC_SUPPORTED 0
#define PHP_STREAM_SYNC_FSYNC 1
#define PHP_STREAM_SYNC_FDSYNC 2
#define php_stream_sync_supported(stream) (_php_stream_set_option((stream), PHP_STREAM_OPTION_SYNC_API, PHP_STREAM_SYNC_SUPPORTED, NULL) == PHP_STREAM_OPTION_RETURN_OK ? 1 : 0)
#define PHP_STREAM_OPTION_RETURN_OK 0 /* option set OK */
#define PHP_STREAM_OPTION_RETURN_ERR -1 /* problem setting option */
#define PHP_STREAM_OPTION_RETURN_NOTIMPL -2 /* underlying stream does not implement; streams can handle it instead */