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Re: Bug in filelock.c
From: |
Paul Eggert |
Subject: |
Re: Bug in filelock.c |
Date: |
Sat, 23 Feb 2013 11:39:43 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 |
On 02/23/2013 11:07 AM, Eli Zaretskii wrote:
> Am I missing something?
No, it looks like a clear bug. Thanks for catching it!
Also, that "p != lockfile" business is bogus;
p can never equal lockfile.
Since the code has obviously never worked and evidently
never been needed and slows Emacs down with unnecessary
syscalls, I propose that we remove it, as follows:
=== modified file 'src/filelock.c'
--- src/filelock.c 2013-02-01 06:30:51 +0000
+++ src/filelock.c 2013-02-23 19:37:31 +0000
@@ -289,44 +289,31 @@ typedef struct
/* Write the name of the lock file for FN into LFNAME. Length will be
- that of FN plus two more for the leading `.#' plus 1 for the
- trailing period plus one for the digit after it plus one for the
+ that of FN plus two more for the leading `.#' plus one for the
null. */
#define MAKE_LOCK_NAME(lock, file) \
- (lock = alloca (SBYTES (file) + 2 + 1 + 1 + 1), \
+ (lock = alloca (SBYTES (file) + 2 + 1), \
fill_in_lock_file_name (lock, (file)))
static void
fill_in_lock_file_name (register char *lockfile, register Lisp_Object fn)
{
ptrdiff_t length = SBYTES (fn);
- register char *p;
- struct stat st;
- int count = 0;
+ char *p;
strcpy (lockfile, SSDATA (fn));
/* Shift the nondirectory part of the file name (including the null)
right two characters. Here is one of the places where we'd have to
do something to support 14-character-max file names. */
- for (p = lockfile + length; p != lockfile && *p != '/'; p--)
+ p = lockfile + length;
+ do
p[2] = *p;
+ while (*--p != '/');
/* Insert the `.#'. */
p[1] = '.';
p[2] = '#';
-
- p = p + length + 2;
-
- while (lstat (lockfile, &st) == 0 && !S_ISLNK (st.st_mode))
- {
- if (count > 9)
- {
- *p = '\0';
- return;
- }
- sprintf (p, ".%d", count++);
- }
}
/* Lock the lock file named LFNAME.