Tue Jul 9 09:37:55 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>

	* sysdeps/mach/libc-lock.h: New file.
	* sysdeps/unix/readdir.c: Do locking.
	* sysdeps/unix/seekdir.c: Likewise.
	* sysdeps/unix/rewinddir.c:  Likewise.
	* sysdeps/unix/closedir.c: Likewise.
	* sysdeps/unix/bsd/telldir.c: Likewise.
	* sysdeps/mach/hurd/seekdir.c: Likewise.
	* sysdeps/mach/hurd/readdir.c: Likewise.
	* sysdeps/mach/hurd/closedir.c: Likewise.
	* sysdeps/mach/hurd/opendir.c: Initialize the lock.
	* sysdeps/unix/opendir.c: Likewise.
	* sysdeps/mach/hurd/dirstream.h: Include <libc-lock.h>.
	(struct __dirstream): Add lock member using __libc_lock_define.
	* sysdeps/unix/dirstream.h: Likewise.

	* sysdeps/stub/libc-lock.h (__libc_lock_fini): New macro.

	* stdlib/mbstowcs.c: Pass address of pointer to mbsrtowcs.

	* stdlib/wcstombs.c: Use wcsrtombs instead of mbsrtowcs.

Thu Jul  4 01:34:04 1996  Ulrich Drepper  <drepper@cygnus.com>

	* locale/programs/stringtrans.c: Fix typo in copyright.

	* stdio-common/printf-prs.c: Add casts to prevent
        signed<->unsigned warnings.

	* stdio-common/printf-parse.h: Initialize state variable before
	calling mbrlen.
	* stdio-common/printf-prs.c: Don't initialize state variable here.
	* stdio-common/vfprintf.c: Don't initialize state variable.
	(vfprintf): While determining length of multibyte string don't
	try to be clever in determining characters to use for first
	call.

	Add real implementation of multibyte<->wide char conversion
	functions.  The functions always convert between the fixed wide
	char format (ISO 10646 in UCS4) and the UTF8 representation of
	this character set.  Conversion between the currently used
	8bit character set and ISO 10646 will not take place.  This is
	what iconv() is for.
	* wcsmbs/wchar.h (mbstate_t): Define as structure to replace
	dummy definition.
	Add optimized version of `mbrlen' function.
	* wcsmbs/btowc.c (btowc): Restrict range of legal characters
	to 0...0x7f.
	* wcsmbs/wctob.c (wctob): Restrict range of legal characters
	to 0..0x7f.
	* wcsmbs/mbrlen.c: Make mbrlen a weak alias of __mbrlen.
	This is needed in the wchar.h header.
	* wcsmbs/mbrtowc.c: Replace dummy implementation.  Convert UTF8
	encoded character to UCS4.
	* wcsmbs/mbsinit.c: Replace dummy implementation.  Test COUNT
	element of `mbstate_t' for initial state.
	* wcsmbs/mbsrtowcs.c: Replace dummy implementation.  Convert UTF8
	encoded string to UCS4 string.
	* wcsmbs/wcrtomb.c: Replace dummy implementation.  Convert UCS4
	character to UTF8 encoded form.
	* wcsmbs/wcsrtombs.c: Replace dummy implementation.  Convert UCS4
	encoded string to UTF8 encoded form.

1 files changed, 25 insertions, 5 deletions

diff --git a/sysdeps/unix/bsd/telldir.c b/sysdeps/unix/bsd/telldir.c
index 0658093..4400883 100644
--- a/sysdeps/unix/bsd/telldir.c
+++ b/sysdeps/unix/bsd/telldir.c
@@ -36,6 +36,7 @@ struct record
 #define NBUCKETS 32
 static struct record *records[32];
 static off_t lastpos;
+__libc_lock_define_initialized(static, lock); /* Locks above data.  */
 
 
 /* Return the current position of DIRP.  */
@@ -43,6 +44,9 @@ off_t
 DEFUN(telldir, (dirp), DIR *dirp)
 {
   struct record *new;
+  off_t pos;
+
+  __libc_lock_lock (lock);
 
   new = malloc (sizeof *new);
   if (new == NULL)
@@ -54,7 +58,11 @@ DEFUN(telldir, (dirp), DIR *dirp)
   new->next = records[new->cookie % NBUCKETS];
   records[new->cookie % NBUCKETS] = new;
 
-  return new->cookie;
+  pos = new->cookie;
+
+  __libc_lock_unlock (lock);
+
+  return pos;
 }
 
 
@@ -65,11 +73,14 @@ DEFUN(seekdir, (dirp, pos), DIR *dirp AND __off_t pos)
 {
   struct record *r, **prevr;
 
+  __libc_lock_lock (lock);
+
   for (prevr = &records[pos % NBUCKETS], r = *prevr;
        r != NULL;
        prevr = &r->next, r = r->next)
     if (r->cookie == pos)
       {
+	__libc_lock_lock (dirp->__lock);
 	if (dirp->filepos != r->pos || dirp->offset != r->offset)
 	  {
 	    dirp->size = 0;	/* Must read a fresh buffer.  */
@@ -79,16 +90,25 @@ DEFUN(seekdir, (dirp, pos), DIR *dirp AND __off_t pos)
 	    dirp->offset = 0;
 	    /* Read entries until we reach the saved offset.  */
 	    while (dirp->offset < r->offset)
-	      if (readdir (dirp) == NULL)
-		break;
+	      {
+		struct dirent *scan;
+		__libc_lock_unlock (dirp->__lock);
+		scan = readdir (dirp);
+		__libc_lock_lock (dirp->__lock);
+		if (! scan)
+		  break;
+	      }
 	  }
+	__libc_lock_unlock (dirp->__lock);
 
 	/* To prevent leaking memory, cookies returned from telldir
 	   can only be used once.  So free this one's record now.  */
 	*prevr = r->next;
 	free (r);
-	return;
+	break;
       }
 
-  /* We lost, but have no way to indicate it.  Oh well.  */
+  __libc_lock_unlock (lock);
+
+  /* If we lost there is no way to indicate it.  Oh well.  */
 }