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authorZack Weinberg <zackw@panix.com>2018-02-05 14:13:41 -0500
committerZack Weinberg <zackw@panix.com>2018-02-07 10:10:32 -0500
commit63fb8f9aa9d19f85599afe4b849b567aefd70a36 (patch)
tree607f89b682d7c7200b389cba7de7e4496806565f /libio
parent6c6c962a202299b55d180e04f44a63ffb748096c (diff)
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Post-cleanup 2: minimize _G_config.h.
Nearly everything in _G_config.h is either junk or more appropriately defined elsewhere: * _G_fpos_t, _G_fpos64_t, and _G_BUFSIZ are already completely unused. * All remaining uses of _G_va_list have been changed to __gnuc_va_list. * The definition of _G_HAVE_ST_BLKSIZE/_IO_HAVE_ST_BLKSIZE has been inlined into its sole use. * The complete definition of _G_iconv_t has been moved to libio.h and renamed _IO_iconv_t (all actual users used that name). * _G_IO_IO_FILE_VERSION is vestigial; some code cares whether _IO_stdin_used exists, but nothing looks at its value. I've preserved the value as a hardwired constant in csu/init.c. This means csu/init.c no longer needs to include anything. * Many of the headers included by _G_config.h were already being included directly by either either libio.h or stdio.h; the remaining ones were moved to libio.h. * _G_HAVE_MREMAP is still relevant, because mremap genuinely is a Linux extension; it's not in POSIX and as far as I can tell it's not available on the Hurd either. I also preserved _G_HAVE_MMAP, since it's conceivable someone would want to port glibc to a MMU-less, mmap-less environment in the future. Both are now always defined to 1/0 as is the current convention, instead of the older 1/undef convention. These are the only symbols still defined in _G_config.h. * The actual inclusion of _G_config.h moves from libio.h to libioP.h, as this is where a potential override of _G_HAVE_MMAP happens. * The #ifdef logic in libioP.h controlling _IO_JUMPS_OFFSET has been simplified. After this patch, the only surviving _G_ symbols are the struct tag names _G_fpos_t and _G_fpos64_t, which are preserved for the sake of C++ mangled names in applications, and _G_HAVE_MMAP and _G_HAVE_MREMAP, which do not seem worth renaming. Installed stripped libraries are unchanged by this patch. * bits/_G_config.h: Move back to sysdeps/generic/_G_config.h. Delete all contents except for definitions of _G_HAVE_MMAP and _G_HAVE_MREMAP. Add commentary explaining those two symbols. * sysdeps/unix/sysv/linux/bits/_G_config.h: Move back to sysdeps/unix/sysv/linux/_G_config.h. Make same content change as above. * libio/libio.h: Don't include bits/_G_config.h here. Include stddef.h with __need_wchar_t defined. Include bits/types/__mbstate_t.h, bits/types/wint_t.h, and gconv.h. Define _IO_iconv_t here, directly. Don't define _IO_HAVE_ST_BLKSIZE. * libio/libioP.h: Include _G_config.h here. Move include of shlib-compat.h up with rest of includes. Simplify conditionals controlling definition of _IO_JUMPS_OFFSET. * csu/init.c: Remove always-true #if around entire file. Don't include stdio.h. Set _IO_stdin_used to hardwired constant 0x20001, and update commentary. * include/stdio.h, sysdeps/ieee754/ldbl-opt/nldbl-compat.h: Replace all uses of _G_va_list with __gnuc_va_list. * libio/filedoalloc.c: Use #if defined _STATBUF_ST_BLKSIZE instead of #if _IO_HAVE_ST_BLKSIZE. * libio/fileops.c: Test _G_HAVE_MREMAP with #if, not #ifdef. * libio/iofdopen.c, libio/iofopen.c: Test _G_HAVE_MMAP with #if, not #ifdef.
Diffstat (limited to 'libio')
-rw-r--r--libio/filedoalloc.c2
-rw-r--r--libio/fileops.c2
-rw-r--r--libio/iofdopen.c4
-rw-r--r--libio/iofopen.c2
-rw-r--r--libio/libio.h22
-rw-r--r--libio/libioP.h20
6 files changed, 33 insertions, 19 deletions
diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c
index 329843827f..d6517e493b 100644
--- a/libio/filedoalloc.c
+++ b/libio/filedoalloc.c
@@ -93,7 +93,7 @@ _IO_file_doallocate (_IO_FILE *fp)
local_isatty (fp->_fileno))
fp->_flags |= _IO_LINE_BUF;
}
-#if _IO_HAVE_ST_BLKSIZE
+#if defined _STATBUF_ST_BLKSIZE
if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ)
size = st.st_blksize;
#endif
diff --git a/libio/fileops.c b/libio/fileops.c
index 6d5393cea3..5fd8a9647f 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -582,7 +582,7 @@ mmap_remap_check (_IO_FILE *fp)
{
/* The file added some pages. We need to remap it. */
void *p;
-#ifdef _G_HAVE_MREMAP
+#if _G_HAVE_MREMAP
p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end
- fp->_IO_buf_base),
ROUNDED (st.st_size), MREMAP_MAYMOVE);
diff --git a/libio/iofdopen.c b/libio/iofdopen.c
index 3546d52b4d..b6f1500dee 100644
--- a/libio/iofdopen.c
+++ b/libio/iofdopen.c
@@ -126,13 +126,13 @@ _IO_new_fdopen (int fd, const char *mode)
new_f->fp.file._lock = &new_f->lock;
#endif
_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd,
-#ifdef _G_HAVE_MMAP
+#if _G_HAVE_MMAP
(use_mmap && (read_write & _IO_NO_WRITES))
? &_IO_wfile_jumps_maybe_mmap :
#endif
&_IO_wfile_jumps);
_IO_JUMPS (&new_f->fp) =
-#ifdef _G_HAVE_MMAP
+#if _G_HAVE_MMAP
(use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap :
#endif
&_IO_file_jumps;
diff --git a/libio/iofopen.c b/libio/iofopen.c
index d6f59497b4..2ea82e2091 100644
--- a/libio/iofopen.c
+++ b/libio/iofopen.c
@@ -33,7 +33,7 @@
_IO_FILE *
__fopen_maybe_mmap (_IO_FILE *fp)
{
-#ifdef _G_HAVE_MMAP
+#if _G_HAVE_MMAP
if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
{
/* Since this is read-only, we might be able to mmap the contents
diff --git a/libio/libio.h b/libio/libio.h
index ff67e18c18..0953120247 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -41,8 +41,24 @@
# error "Someone forgot to include stdio-lock.h"
#endif
-#include <bits/_G_config.h>
-/* ALL of these should be defined in _G_config.h */
+#define __need_wchar_t
+#include <stddef.h>
+
+#include <bits/types/__mbstate_t.h>
+#include <bits/types/wint_t.h>
+#include <gconv.h>
+
+typedef union
+{
+ struct __gconv_info __cd;
+ struct
+ {
+ struct __gconv_info __cd;
+ struct __gconv_step_data __data;
+ } __combined;
+} _IO_iconv_t;
+
+/* Map the names used in libio to the names used in libc generally. */
#define _IO_fpos_t __fpos_t
#define _IO_fpos64_t __fpos64_t
#define _IO_size_t size_t
@@ -51,8 +67,6 @@
#define _IO_off64_t __off64_t
#define _IO_pid_t __pid_t
#define _IO_uid_t __uid_t
-#define _IO_iconv_t _G_iconv_t
-#define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
#define _IO_BUFSIZ BUFSIZ
#define _IO_wint_t wint_t
#define _IO_va_list __gnuc_va_list
diff --git a/libio/libioP.h b/libio/libioP.h
index 8edc207277..58cc9de094 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -46,6 +46,12 @@
#include <libio/libio.h>
#include "iolibio.h"
+#include <shlib-compat.h>
+
+/* For historical reasons this is the name of the sysdeps header that
+ adjusts the libio configuration. */
+#include <_G_config.h>
+
#ifdef __cplusplus
extern "C" {
#endif
@@ -75,16 +81,10 @@ extern "C" {
* object being acted on (i.e. the 'this' parameter).
*/
-#include <shlib-compat.h>
-#if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
- /* Setting this macro disables the use of the _vtable_offset bias in
- _IO_JUMPS_FUNCS, below. That is only needed if we want to
- support old binaries (see oldfileops.c). */
-# define _G_IO_NO_BACKWARD_COMPAT 1
-#endif
-
-#if (!defined _IO_USE_OLD_IO_FILE \
- && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
+/* Setting this macro to 1 enables the use of the _vtable_offset bias
+ in _IO_JUMPS_FUNCS, below. This is only needed for new-format
+ _IO_FILE in libc that must support old binaries (see oldfileops.c). */
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) && !defined _IO_USE_OLD_IO_FILE
# define _IO_JUMPS_OFFSET 1
#else
# define _IO_JUMPS_OFFSET 0