Message-ID: <399A695C.1213BB11@softhome.net>
Date: Wed, 16 Aug 2000 12:13:48 +0200
From: Laurynas Biveinis <lauras AT softhome DOT net>
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To: DJGPP Workers <djgpp-workers AT delorie DOT com>
Subject: Patch: file sharing in readlink()
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Reply-To: djgpp-workers AT delorie DOT com

Here is the change for readlink() based on Eli's
comments and open() code.

Any comments?

Laurynas

Index: readlink.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/compat/unistd/readlink.c,v
retrieving revision 1.1
diff -u -r1.1 readlink.c
--- readlink.c	2000/08/11 11:16:24	1.1
+++ readlink.c	2000/08/16 10:15:43
@@ -45,7 +45,17 @@
    /* Now we check for special DJGPP symlink format */
    fd = _open(filename, O_RDONLY);
    if (fd < 0)
-      return -1; /* errno from open() call */
+   {
+      /* Retry with DENY-NONE share bit set. It might help in some cases
+       * when symlink file is opened by another program. We don't try with
+       * DENY-NONE set in the first _open() call, because it might fail under
+       * some circumstances. For details, see Ralf Brown's Interrupt List,
+       * description of INT 0x21, function 0x3D.
+       */
+      fd = _open(filename, O_RDONLY | SH_DENYNO);
+      if (fd < 0)
+         return -1; /* errno from open() call */
+   } 
 
    bytes_read = read(fd, &buf, _SYMLINK_FILE_LEN);
    _close(fd);