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| author | Roland McGrath <roland@gnu.org> | 2002-08-02 01:27:53 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 2002-08-02 01:27:53 +0000 |
| commit | e42637b67781ed47a1581c6062421de514560cb3 (patch) | |
| tree | 357b08520e6b39410be8266299d4657a98c10dad /libio/iofdopen.c | |
| parent | 0950889b810736fe7ad340a13a5ecf76672e1a84 (diff) | |
| download | glibc-e42637b67781ed47a1581c6062421de514560cb3.tar.gz glibc-e42637b67781ed47a1581c6062421de514560cb3.tar.xz glibc-e42637b67781ed47a1581c6062421de514560cb3.zip | |
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.
Diffstat (limited to 'libio/iofdopen.c')
| -rw-r--r-- | libio/iofdopen.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/libio/iofdopen.c b/libio/iofdopen.c index 5167220aa2..c86cf0f3ca 100644 --- a/libio/iofdopen.c +++ b/libio/iofdopen.c @@ -124,8 +124,19 @@ _IO_new_fdopen (fd, mode) #ifdef _IO_MTSAFE_IO new_f->fp.file._lock = &new_f->lock; #endif - _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &INTUSE(_IO_wfile_jumps)); - _IO_JUMPS (&new_f->fp) = &INTUSE(_IO_file_jumps); + /* Set up initially to use the `maybe_mmap' jump tables rather than using + __fopen_maybe_mmap to do it, because we need them in place before we + call _IO_file_attach or else it will allocate a buffer immediately. */ + _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, +#ifdef _G_HAVE_MMAP + (read_write & _IO_NO_WRITES) ? &_IO_wfile_jumps_maybe_mmap : +#endif + &INTUSE(_IO_wfile_jumps)); + _IO_JUMPS (&new_f->fp) = +#ifdef _G_HAVE_MMAP + (read_write & _IO_NO_WRITES) ? &_IO_file_jumps_maybe_mmap : +#endif + &INTUSE(_IO_file_jumps); INTUSE(_IO_file_init) (&new_f->fp); #if !_IO_UNIFIED_JUMPTABLES new_f->fp.vtable = NULL; @@ -143,7 +154,7 @@ _IO_new_fdopen (fd, mode) _IO_mask_flags (&new_f->fp.file, read_write, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); - return __fopen_maybe_mmap (&new_f->fp.file); + return &new_f->fp.file; } INTDEF2(_IO_new_fdopen, _IO_fdopen) |