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authorUlrich Drepper <drepper@redhat.com>2002-08-30 07:07:16 +0000
committerUlrich Drepper <drepper@redhat.com>2002-08-30 07:07:16 +0000
commitdd0ee2e1022843c6a296a9141b7cab7ea74eec28 (patch)
tree540fab065032d56a49c05c3787e50500e40bc87d /libio
parentb7fc6d07afa8956c5a18d28db02a52d63a70acb8 (diff)
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Update.
2002-08-29 Ulrich Drepper <drepper@redhat.com> * libio/fileops.c (_IO_new_file_fopen): Recognize new mode specifier 'm' to enable mmap I/O. * libio/libio.h (_IO_FILE): Rename _blksize field to _flags2. The former wasn't used (anymore?). (_IO_FLAGS2_MMAP): New define. * libio/genops.c (_IO_no_init): Initialize _flags2 field. * libio/iofopen.c (__fopen_maybe_mmap): Use mmap callbacks only if _IO_FLAGS2_MMAP bit is set. * libio/iofdopen.c (_IO_new_fdopen): Recognize 'm' mode specifier. Enable mmap-using mode only if 'm' was set.
Diffstat (limited to 'libio')
-rw-r--r--libio/genops.c1
-rw-r--r--libio/iofdopen.c31
-rw-r--r--libio/iofopen.c2
-rw-r--r--libio/libio.h6
4 files changed, 34 insertions, 6 deletions
diff --git a/libio/genops.c b/libio/genops.c
index 115c7df..14e6c0b 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -610,6 +610,7 @@ _IO_no_init (fp, flags, orientation, wd, jmp)
struct _IO_jump_t *jmp;
{
fp->_flags = _IO_MAGIC|flags;
+ fp->_flags2 = 0;
fp->_IO_buf_base = NULL;
fp->_IO_buf_end = NULL;
fp->_IO_read_base = NULL;
diff --git a/libio/iofdopen.c b/libio/iofdopen.c
index 2fb493e..e122562 100644
--- a/libio/iofdopen.c
+++ b/libio/iofdopen.c
@@ -59,8 +59,10 @@ _IO_new_fdopen (fd, mode)
struct _IO_wide_data wd;
} *new_f;
int fd_flags;
+ int i;
+ int use_mmap = 0;
- switch (*mode++)
+ switch (*mode)
{
case 'r':
read_write = _IO_NO_WRITES;
@@ -76,8 +78,26 @@ _IO_new_fdopen (fd, mode)
MAYBE_SET_EINVAL;
return NULL;
}
- if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
- read_write &= _IO_IS_APPENDING;
+ for (i = 1; i < 5; ++i)
+ {
+ switch (*++mode)
+ {
+ case '\0':
+ break;
+ case '+':
+ read_write &= _IO_IS_APPENDING;
+ break;
+ case 'm':
+ use_mmap = 1;
+ continue;
+ case 'x':
+ case 'b':
+ default:
+ /* Ignore */
+ continue;
+ }
+ break;
+ }
#ifdef F_GETFL
fd_flags = _IO_fcntl (fd, F_GETFL);
#ifndef O_ACCMODE
@@ -129,12 +149,13 @@ _IO_new_fdopen (fd, mode)
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 :
+ (use_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 :
+ (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap :
#endif
&INTUSE(_IO_file_jumps);
INTUSE(_IO_file_init) (&new_f->fp);
diff --git a/libio/iofopen.c b/libio/iofopen.c
index 00a2c5f..8cd68a3 100644
--- a/libio/iofopen.c
+++ b/libio/iofopen.c
@@ -41,7 +41,7 @@ __fopen_maybe_mmap (fp)
_IO_FILE *fp;
{
#ifdef _G_HAVE_MMAP
- if (fp->_flags & _IO_NO_WRITES)
+ if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
{
/* Since this is read-only, we might be able to mmap the contents
directly. We delay the decision until the first read attempt by
diff --git a/libio/libio.h b/libio/libio.h
index c8231df..3c6bef9 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -137,6 +137,8 @@
#define _IO_BAD_SEEN 0x4000
#define _IO_USER_LOCK 0x8000
+#define _IO_FLAGS2_MMAP 1
+
/* These are "formatting flags" matching the iostream fmtflags enum values. */
#define _IO_SKIPWS 01
#define _IO_LEFT 02
@@ -282,7 +284,11 @@ struct _IO_FILE {
struct _IO_FILE *_chain;
int _fileno;
+#if 0
int _blksize;
+#else
+ int _flags2;
+#endif
_IO_off_t _old_offset; /* This used to be _offset but it's too small. */
#define __HAVE_COLUMN /* temporary */