Update.

1998-08-25  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/generic/dl-cache.c: Move static variable cache and cachesize
	to toplevel.
	(_dl_unload_cache): New function.
	* elf/Versions [libc GLIBC_2.1]: Add _dl_unload_cache.
	* elf/dl-open.c (_dl_open): Unload map file before freeing the lock.
	* elf/rtld (dl_main): Unload map file before jumping to user code.

	* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h: Define O_DIRECT.
	Correct comment for O_LARGEFILE.
	* sysdeps/unix/sysv/linux/bits/fcntl.h: Define O_DIRECT.
	Change O_LARGEFILE to correct value.

1998-08-25 14:34  Ulrich Drepper  <drepper@cygnus.com>

	* libio/iogetline.c (_IO_getline_info): Don't read anything for
	N == 0.  Patch by HJ Lu.

ChangeLog

@@ -1,3 +1,22 @@
+1998-08-25  Ulrich Drepper  <drepper@cygnus.com>
+
+	* sysdeps/generic/dl-cache.c: Move static variable cache and cachesize
+	to toplevel.
+	(_dl_unload_cache): New function.
+	* elf/Versions [libc GLIBC_2.1]: Add _dl_unload_cache.
+	* elf/dl-open.c (_dl_open): Unload map file before freeing the lock.
+	* elf/rtld (dl_main): Unload map file before jumping to user code.
+
+	* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h: Define O_DIRECT.
+	Correct comment for O_LARGEFILE.
+	* sysdeps/unix/sysv/linux/bits/fcntl.h: Define O_DIRECT.
+	Change O_LARGEFILE to correct value.
+
+1998-08-25 14:34  Ulrich Drepper  <drepper@cygnus.com>
+
+	* libio/iogetline.c (_IO_getline_info): Don't read anything for
+	N == 0.  Patch by HJ Lu.
+
 1998-08-25 11:43  Ulrich Drepper  <drepper@cygnus.com>
 
 	* elf/elf.h: Add syminfo stuff and other DT_* from Solaris' ELF.

elf/Versions

@@ -21,7 +21,7 @@ libc {
     _dl_profile; _dl_profile_map; _dl_profile_output; _dl_start_profile;
 
     # functions used in other libraries
-    _dl_mcount; _dl_mcount_wrapper; _dl_mcount_wrapper_check;
+    _dl_mcount; _dl_mcount_wrapper; _dl_mcount_wrapper_check; _dl_unload_cache;
   }
 }
 

elf/dl-open.c

@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/mman.h>		/* Check whether MAP_COPY is defined.  */
 #include <bits/libc-lock.h>
 #include <elf/ldsodefs.h>
 
@@ -31,6 +32,9 @@ extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
 						     ElfW(Addr) *user_entry));
 weak_extern (_dl_sysdep_start)
 
+/* This function is used to unload the cache file if necessary.  */
+extern void _dl_unload_cache (void);
+
 extern int __libc_multiple_libcs;	/* Defined in init-first.c.  */
 
 extern int __libc_argc;
@@ -224,6 +228,11 @@ _dl_open (const char *file, int mode)
   args.map = NULL;
   errcode = _dl_catch_error (&errstring, dl_open_worker, &args);
 
+#ifndef MAP_COPY
+  /* We must munmap() the cache file.  */
+  _dl_unload_cache ();
+#endif
+
   /* Release the lock.  */
   __libc_lock_unlock (_dl_load_lock);
 

elf/rtld.c

@@ -40,6 +40,9 @@ extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
 						     ElfW(Addr) *user_entry));
 extern void _dl_sysdep_start_cleanup (void);
 
+/* This function is used to unload the cache file if necessary.  */
+extern void _dl_unload_cache (void);
+
 /* System-dependent function to read a file's whole contents
    in the most convenient manner available.  */
 extern void *_dl_sysdep_read_whole_file (const char *filename,
@@ -918,6 +921,11 @@ of this helper program; chances are you did not intend to run this program.\n\
     _dl_debug_state ();
   }
 
+#ifndef MAP_COPY
+  /* We must munmap() the cache file.  */
+  _dl_unload_cache ();
+#endif
+
   /* Now enable profiling if needed.  */
   if (_dl_profile_map != NULL)
     /* We must prepare the profiling.  */

libio/iogetline.c

@@ -59,7 +59,7 @@ _IO_getline_info (fp, buf, n, delim, extract_delim, eof)
   char *ptr = buf;
   if (eof != NULL)
     *eof = 0;
-  do
+  while (n != 0);
     {
       _IO_ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr;
       if (len <= 0)
@@ -108,7 +108,7 @@ _IO_getline_info (fp, buf, n, delim, extract_delim, eof)
 	    ptr += len;
 	    n -= len;
 	  }
-    } while (n != 0);
+    }
   return ptr - buf;
 }
 

sysdeps/generic/dl-cache.c

@@ -44,6 +44,10 @@ struct cache_file
       } libs[0];
   };
 
+/* This is the starting address and the size of the mmap()ed file.  */
+static struct cache_file *cache;
+static size_t cachesize;
+
 /* This is the cache ID we expect.  Normally it is 3 for glibc linked
    binaries.  */
 int _dl_correct_cache_id = 3;
@@ -54,8 +58,6 @@ int _dl_correct_cache_id = 3;
 const char *
 _dl_load_cache_lookup (const char *name)
 {
-  static struct cache_file *cache;
-  static size_t cachesize;
   unsigned int i;
   const char *best;
 
@@ -114,3 +116,19 @@ _dl_load_cache_lookup (const char *name)
 
   return best;
 }
+
+#ifndef MAP_COPY
+/* If the system does not support MAP_COPY we cannot leave the file open
+   all the time since this would create problems when the file is replaced.
+   Therefore we provide this function to close the file and open it again
+   once needed.  */
+void
+_dl_unload_cache (void)
+{
+  if (cache != NULL && cache != (struct cache_file *) -1)
+    {
+      __munmap (cache, cachesize);
+      cache = NULL;
+    }
+}
+#endif

sysdeps/unix/sysv/linux/alpha/bits/fcntl.h

@@ -43,7 +43,11 @@
 #define O_FSYNC		O_SYNC
 #define O_ASYNC		020000	/* fcntl, for BSD compatibility */
 
-/* XXX missing */
+#ifdef __USE_GNU
+# define O_DIRECT	040000	/* Direct disk access.  */
+#endif
+
+/* Not necessary, files are always with 64bit off_t.  */
 #define O_LARGEFILE	0
 
 /* Values for the second argument to `fcntl'.  */

sysdeps/unix/sysv/linux/bits/fcntl.h

@@ -41,6 +41,10 @@
 #define O_FSYNC		O_SYNC
 #define O_ASYNC		020000
 
+#ifdef __USE_GNU
+# define O_DIRECT	040000	/* Direct disk access.  */
+#endif
+
 /* For now Linux has synchronisity options for data and read operations.
    We define the symbols here but let them do the same as O_SYNC since
    this is a superset.  */
@@ -49,9 +53,8 @@
 # define O_RSYNC	O_SYNC	/* Synchronize read operations.  */
 #endif
 
-/* XXX missing */
 #ifdef __USE_LARGEFILE64
-# define O_LARGEFILE	0
+# define O_LARGEFILE	0100000
 #endif
 
 /* Values for the second argument to `fcntl'.  */