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[patch] mremap
- From: Marcus Brinkmann <marcus dot brinkmann at ruhr-uni-bochum dot de>
- To: libc-alpha at sources dot redhat dot com
- Date: Wed, 03 Nov 2004 02:33:12 +0100
- Subject: [patch] mremap
Hi,
libio/fileops.c has one place where a dependency on Linux is
hard-coded. This patch replaces that with a check on _G_HAVE_MREMAP,
and makes changes in the _G_config.h files accordingly. Implementing
mremap on GNU/Hurd on Mach isn't possible without a kernel change (I
think). So for now I have split the file into a Linux and a Hurd one
("for now" because I am working on a port of GNU/Hurd to L4, where
implementing mremap() in user space is possible).
The patch is long because it contains the whole _G_config.h files.
But actually, the only change is to define _G_HAVE_MREMAP in the
linuxish one.
2004-11-03 Marcus Brinkmann <marcus@gnu.org>
* sysdeps/gnu/_G_config.h: Move to ...
* sysdeps/mach/hurd/_G_config.h: ... here.
* sysdeps/unix/sysv/linux/_G_config.h: New file.
* libio/fileops.c (mmap_remap_check) [__linux__]: Replaced with
[_G_HAVE_MREMAP].
diff -rup /home/marcus/gnu/hurd/cvs/libc/libio/fileops.c ./libio/fileops.c
--- /home/marcus/gnu/hurd/cvs/libc/libio/fileops.c 2004-10-10 12:40:53.000000000 +0200
+++ ./libio/fileops.c 2004-11-03 01:35:31.000000000 +0100
@@ -635,7 +635,7 @@ mmap_remap_check (_IO_FILE *fp)
{
/* The file added some pages. We need to remap it. */
void *p;
-#if defined __linux__ /* XXX */
+#ifdef _G_HAVE_MREMAP
p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end
- fp->_IO_buf_base),
ROUNDED (st.st_size), MREMAP_MAYMOVE);
--- /dev/null 2004-09-14 00:34:58.000000000 +0200
+++ sysdeps/mach/hurd/_G_config.h 2004-11-03 01:31:30.000000000 +0100
@@ -0,0 +1,102 @@
+/* This file is needed by libio to define various configuration parameters.
+ These are always the same in the GNU C library. */
+
+#ifndef _G_config_h
+#define _G_config_h 1
+
+/* Define types for libio in terms of the standard internal type names. */
+
+#include <bits/types.h>
+#define __need_size_t
+#define __need_wchar_t
+#define __need_wint_t
+#define __need_NULL
+#include <stddef.h>
+#ifndef _WINT_T
+/* Integral type unchanged by default argument promotions that can
+ hold any value corresponding to members of the extended character
+ set, as well as at least one value that does not correspond to any
+ member of the extended character set. */
+# define _WINT_T
+typedef unsigned int wint_t;
+#endif
+#define __need_mbstate_t
+#include <wchar.h>
+#define _G_size_t size_t
+typedef struct
+{
+ __off_t __pos;
+ __mbstate_t __state;
+} _G_fpos_t;
+typedef struct
+{
+ __off64_t __pos;
+ __mbstate_t __state;
+} _G_fpos64_t;
+#define _G_ssize_t __ssize_t
+#define _G_off_t __off_t
+#define _G_off64_t __off64_t
+#define _G_pid_t __pid_t
+#define _G_uid_t __uid_t
+#define _G_wchar_t wchar_t
+#define _G_wint_t wint_t
+#define _G_stat64 stat64
+#include <gconv.h>
+typedef union
+{
+ struct __gconv_info __cd;
+ struct
+ {
+ struct __gconv_info __cd;
+ struct __gconv_step_data __data;
+ } __combined;
+} _G_iconv_t;
+
+typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
+typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
+typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
+typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
+
+#define _G_HAVE_BOOL 1
+
+
+/* These library features are always available in the GNU C library. */
+#define _G_HAVE_ATEXIT 1
+#define _G_HAVE_SYS_CDEFS 1
+#define _G_HAVE_SYS_WAIT 1
+#define _G_NEED_STDARG_H 1
+#define _G_va_list __gnuc_va_list
+
+#define _G_HAVE_PRINTF_FP 1
+#define _G_HAVE_MMAP 1
+#define _G_HAVE_LONG_DOUBLE_IO 1
+#define _G_HAVE_IO_FILE_OPEN 1
+#define _G_HAVE_IO_GETLINE_INFO 1
+
+#define _G_IO_IO_FILE_VERSION 0x20001
+
+#define _G_OPEN64 __open64
+#define _G_LSEEK64 __lseek64
+#define _G_MMAP64 __mmap64
+#define _G_FSTAT64(fd,buf) __fxstat64 (_STAT_VER, fd, buf)
+
+/* This is defined by <bits/stat.h> if `st_blksize' exists. */
+#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE)
+
+#define _G_BUFSIZ 8192
+
+/* These are the vtbl details for ELF. */
+#define _G_NAMES_HAVE_UNDERSCORE 0
+#define _G_VTABLE_LABEL_HAS_LENGTH 1
+#define _G_USING_THUNKS 1
+#define _G_VTABLE_LABEL_PREFIX "__vt_"
+#define _G_VTABLE_LABEL_PREFIX_ID __vt_
+
+
+#if defined __cplusplus || defined __STDC__
+# define _G_ARGS(ARGLIST) ARGLIST
+#else
+# define _G_ARGS(ARGLIST) ()
+#endif
+
+#endif /* _G_config.h */
--- /dev/null 2004-09-14 00:34:58.000000000 +0200
+++ sysdeps/unix/sysv/linux/_G_config.h 2004-11-03 01:33:19.000000000 +0100
@@ -0,0 +1,103 @@
+/* This file is needed by libio to define various configuration parameters.
+ These are always the same in the GNU C library. */
+
+#ifndef _G_config_h
+#define _G_config_h 1
+
+/* Define types for libio in terms of the standard internal type names. */
+
+#include <bits/types.h>
+#define __need_size_t
+#define __need_wchar_t
+#define __need_wint_t
+#define __need_NULL
+#include <stddef.h>
+#ifndef _WINT_T
+/* Integral type unchanged by default argument promotions that can
+ hold any value corresponding to members of the extended character
+ set, as well as at least one value that does not correspond to any
+ member of the extended character set. */
+# define _WINT_T
+typedef unsigned int wint_t;
+#endif
+#define __need_mbstate_t
+#include <wchar.h>
+#define _G_size_t size_t
+typedef struct
+{
+ __off_t __pos;
+ __mbstate_t __state;
+} _G_fpos_t;
+typedef struct
+{
+ __off64_t __pos;
+ __mbstate_t __state;
+} _G_fpos64_t;
+#define _G_ssize_t __ssize_t
+#define _G_off_t __off_t
+#define _G_off64_t __off64_t
+#define _G_pid_t __pid_t
+#define _G_uid_t __uid_t
+#define _G_wchar_t wchar_t
+#define _G_wint_t wint_t
+#define _G_stat64 stat64
+#include <gconv.h>
+typedef union
+{
+ struct __gconv_info __cd;
+ struct
+ {
+ struct __gconv_info __cd;
+ struct __gconv_step_data __data;
+ } __combined;
+} _G_iconv_t;
+
+typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
+typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
+typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
+typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
+
+#define _G_HAVE_BOOL 1
+
+
+/* These library features are always available in the GNU C library. */
+#define _G_HAVE_ATEXIT 1
+#define _G_HAVE_SYS_CDEFS 1
+#define _G_HAVE_SYS_WAIT 1
+#define _G_NEED_STDARG_H 1
+#define _G_va_list __gnuc_va_list
+
+#define _G_HAVE_PRINTF_FP 1
+#define _G_HAVE_MMAP 1
+#define _G_HAVE_MREMAP 1
+#define _G_HAVE_LONG_DOUBLE_IO 1
+#define _G_HAVE_IO_FILE_OPEN 1
+#define _G_HAVE_IO_GETLINE_INFO 1
+
+#define _G_IO_IO_FILE_VERSION 0x20001
+
+#define _G_OPEN64 __open64
+#define _G_LSEEK64 __lseek64
+#define _G_MMAP64 __mmap64
+#define _G_FSTAT64(fd,buf) __fxstat64 (_STAT_VER, fd, buf)
+
+/* This is defined by <bits/stat.h> if `st_blksize' exists. */
+#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE)
+
+#define _G_BUFSIZ 8192
+
+/* These are the vtbl details for ELF. */
+#define _G_NAMES_HAVE_UNDERSCORE 0
+#define _G_VTABLE_LABEL_HAS_LENGTH 1
+#define _G_USING_THUNKS 1
+#define _G_VTABLE_LABEL_PREFIX "__vt_"
+#define _G_VTABLE_LABEL_PREFIX_ID __vt_
+
+
+#if defined __cplusplus || defined __STDC__
+# define _G_ARGS(ARGLIST) ARGLIST
+#else
+# define _G_ARGS(ARGLIST) ()
+#endif
+
+#endif /* _G_config.h */
--- sysdeps/gnu/_G_config.h 2004-11-03 02:06:56.000000000 +0100
+++ /dev/null 2004-09-14 00:34:58.000000000 +0200
@@ -1,102 +0,0 @@
-/* This file is needed by libio to define various configuration parameters.
- These are always the same in the GNU C library. */
-
-#ifndef _G_config_h
-#define _G_config_h 1
-
-/* Define types for libio in terms of the standard internal type names. */
-
-#include <bits/types.h>
-#define __need_size_t
-#define __need_wchar_t
-#define __need_wint_t
-#define __need_NULL
-#include <stddef.h>
-#ifndef _WINT_T
-/* Integral type unchanged by default argument promotions that can
- hold any value corresponding to members of the extended character
- set, as well as at least one value that does not correspond to any
- member of the extended character set. */
-# define _WINT_T
-typedef unsigned int wint_t;
-#endif
-#define __need_mbstate_t
-#include <wchar.h>
-#define _G_size_t size_t
-typedef struct
-{
- __off_t __pos;
- __mbstate_t __state;
-} _G_fpos_t;
-typedef struct
-{
- __off64_t __pos;
- __mbstate_t __state;
-} _G_fpos64_t;
-#define _G_ssize_t __ssize_t
-#define _G_off_t __off_t
-#define _G_off64_t __off64_t
-#define _G_pid_t __pid_t
-#define _G_uid_t __uid_t
-#define _G_wchar_t wchar_t
-#define _G_wint_t wint_t
-#define _G_stat64 stat64
-#include <gconv.h>
-typedef union
-{
- struct __gconv_info __cd;
- struct
- {
- struct __gconv_info __cd;
- struct __gconv_step_data __data;
- } __combined;
-} _G_iconv_t;
-
-typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
-typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
-typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
-typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
-
-#define _G_HAVE_BOOL 1
-
-
-/* These library features are always available in the GNU C library. */
-#define _G_HAVE_ATEXIT 1
-#define _G_HAVE_SYS_CDEFS 1
-#define _G_HAVE_SYS_WAIT 1
-#define _G_NEED_STDARG_H 1
-#define _G_va_list __gnuc_va_list
-
-#define _G_HAVE_PRINTF_FP 1
-#define _G_HAVE_MMAP 1
-#define _G_HAVE_LONG_DOUBLE_IO 1
-#define _G_HAVE_IO_FILE_OPEN 1
-#define _G_HAVE_IO_GETLINE_INFO 1
-
-#define _G_IO_IO_FILE_VERSION 0x20001
-
-#define _G_OPEN64 __open64
-#define _G_LSEEK64 __lseek64
-#define _G_MMAP64 __mmap64
-#define _G_FSTAT64(fd,buf) __fxstat64 (_STAT_VER, fd, buf)
-
-/* This is defined by <bits/stat.h> if `st_blksize' exists. */
-#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE)
-
-#define _G_BUFSIZ 8192
-
-/* These are the vtbl details for ELF. */
-#define _G_NAMES_HAVE_UNDERSCORE 0
-#define _G_VTABLE_LABEL_HAS_LENGTH 1
-#define _G_USING_THUNKS 1
-#define _G_VTABLE_LABEL_PREFIX "__vt_"
-#define _G_VTABLE_LABEL_PREFIX_ID __vt_
-
-
-#if defined __cplusplus || defined __STDC__
-# define _G_ARGS(ARGLIST) ARGLIST
-#else
-# define _G_ARGS(ARGLIST) ()
-#endif
-
-#endif /* _G_config.h */