lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-29 11:41:21 +03:00
Code Activity

* libio/fileops.c (_IO_file_sync_mmap): New function.

Browse Source 
(_IO_file_jumps_mmap): Use it.
	(_IO_file_underflow_mmap): Rewritten.  If after EOF or fflush,
	repeat the stat check and resize the mapped buffer as necessary.

2002-07-31  Roland McGrath  <roland@frob.com>

	* libio/fileops.c (decide_maybe_mmap): New static function.
	Code taken from libio/iofopen.c:__fopen_maybe_mmap to try to
	mmap the file contents.  Then switch the jump tables to the mmap
	tables if it worked, or the vanilla file tables if not.
	(_IO_file_underflow_maybe_mmap): New function.
	(_IO_file_seekoff_maybe_mmap): New function.
	(_IO_file_xsgetn_maybe_mmap): New function.
	(_IO_file_jumps_maybe_mmap): New variable, jump table using those.
	* libio/libioP.h: Declare those.
	* libio/wfileops.c (_IO_wfile_underflow_maybe_mmap): New function.
	(_IO_wfile_jumps_maybe_mmap): New variable, jump table using that.
	* libio/iofopen.c (__fopen_maybe_mmap): Don't try to mmap here.
	If the stream is read-only, set its jump tables to those new ones.
	* libio/iofdopen.c (_IO_new_fdopen) [_G_HAVE_MMAP]: Set the initial
	jump tables to the maybe_mmap ones, and don't call __fopen_maybe_mmap.
	We need the tables set before _IO_file_attach.

	* libio/tst-mmap-eofsync.c: New file.
	* libio/tst-mmap-fflushsync.c: New file.
	* libio/bug-mmap-fflush.c: New file.
	* libio/tst-mmap2-eofsync.c: New file.
	* libio/Makefile (tests): Add them.

	* libio/wfileops.c (_IO_wfile_underflow_mmap): Don't set EOF bit when
	_IO_file_underflow_mmap fails, it already set the appropriate bit.
This commit is contained in:
Roland McGrath
2002-08-02 01:29:37 +00:00
parent e42637b677
commit acbee5f637
8 changed files with 724 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
libio/wfileops.c
View File

@ -314,11 +314,9 @@ _IO_wfile_underflow_mmap (_IO_FILE *fp)
if (fp->_IO_read_ptr >= fp->_IO_read_end
/* No. But maybe the read buffer is not fully set up. */
&& _IO_file_underflow_mmap (fp) == EOF)
{
/* Nothing available. */
fp->_flags |= _IO_EOF_SEEN;
return WEOF;
}
/* Nothing available. _IO_file_underflow_mmap has set the EOF or error
flags as appropriate. */
return WEOF;
/* There is more in the external. Convert it. */
read_stop = (const char *) fp->_IO_read_ptr;
@ -356,6 +354,18 @@ _IO_wfile_underflow_mmap (_IO_FILE *fp)
return WEOF;
}
static wint_t
_IO_wfile_underflow_maybe_mmap (_IO_FILE *fp)
{
/* This is the first read attempt. Doing the underflow will choose mmap
or vanilla operations and then punt to the chosen underflow routine.
Then we can punt to ours. */
if (_IO_file_underflow_maybe_mmap (fp) == EOF)
return WEOF;
return _IO_WUNDERFLOW (fp);
}
wint_t
_IO_wfile_overflow (f, wch)
@ -896,3 +906,27 @@ struct _IO_jump_t _IO_wfile_jumps_mmap =
JUMP_INIT(showmanyc, _IO_default_showmanyc),
JUMP_INIT(imbue, _IO_default_imbue)
};
struct _IO_jump_t _IO_wfile_jumps_maybe_mmap =
{
JUMP_INIT_DUMMY,
JUMP_INIT(finish, _IO_new_file_finish),
JUMP_INIT(overflow, (_IO_overflow_t) INTUSE(_IO_wfile_overflow)),
JUMP_INIT(underflow, (_IO_underflow_t) _IO_wfile_underflow_maybe_mmap),
JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
JUMP_INIT(pbackfail, (_IO_pbackfail_t) INTUSE(_IO_wdefault_pbackfail)),
JUMP_INIT(xsputn, INTUSE(_IO_wfile_xsputn)),
JUMP_INIT(xsgetn, INTUSE(_IO_file_xsgetn)),
JUMP_INIT(seekoff, INTUSE(_IO_wfile_seekoff)),
JUMP_INIT(seekpos, _IO_default_seekpos),
JUMP_INIT(setbuf, _IO_file_setbuf_mmap),
JUMP_INIT(sync, (_IO_sync_t) INTUSE(_IO_wfile_sync)),
JUMP_INIT(doallocate, _IO_wfile_doallocate),
JUMP_INIT(read, INTUSE(_IO_file_read)),
JUMP_INIT(write, _IO_new_file_write),
JUMP_INIT(seek, INTUSE(_IO_file_seek)),
JUMP_INIT(close, _IO_file_close),
JUMP_INIT(stat, INTUSE(_IO_file_stat)),
JUMP_INIT(showmanyc, _IO_default_showmanyc),
JUMP_INIT(imbue, _IO_default_imbue)
};