Use feature tests for fcntl.h, string.h. Don't include time.h, done by

[bpt/emacs.git] / src / filelock.c

diff --git a/src/filelock.c b/src/filelock.c
index c08a8a4..4ca356f 100644 (file)
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -19,14 +19,11 @@ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
 
+#include <config.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <signal.h>
-#include <config.h>
 #include <stdio.h>
-#ifdef HAVE_STDLIB_H
-#include <stdlib.h>
-#endif
 
 #ifdef VMS
 #include "vms-pwd.h"
@@ -35,33 +32,32 @@ Boston, MA 02111-1307, USA.  */
 #endif /* not VMS */
 
 #include <sys/file.h>
-#ifdef USG
+#ifdef HAVE_FCNTL_H
 #include <fcntl.h>
+#endif
+#ifdef HAVE_STRING_H
 #include <string.h>
-#endif /* USG */
+#endif
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
 #ifdef __FreeBSD__
-#include <sys/time.h>
-#include <sys/types.h>
 #include <sys/sysctl.h>
 #endif /* __FreeBSD__ */
 
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
 #include "lisp.h"
 #include "buffer.h"
 #include "charset.h"
 #include "coding.h"
 #include "systime.h"
 
-#include <time.h>
-#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
-
 /* The directory for writing temporary files.  */
 
 Lisp_Object Vtemporary_file_directory;
@@ -123,6 +119,10 @@ static int boot_time_initialized;
 
 extern Lisp_Object Vshell_file_name;
 
+#ifdef BOOT_TIME
+static void get_boot_time_1 P_ ((char *, int));
+#endif
+
 static time_t
 get_boot_time ()
 {
@@ -202,9 +202,15 @@ get_boot_time ()
          if (! NILP (Ffile_exists_p (tempname)))
            {
              Lisp_Object args[6];
-             tempname = Fexpand_file_name (build_string ("wtmp"),
+
+             /* The utmp functions on mescaline.gnu.org accept only
+                file names up to 8 characters long.  Choose a 2
+                character long prefix, and call make_temp_file with
+                second arg non-zero, so that it will add not more
+                than 6 characters to the prefix.  */
+             tempname = Fexpand_file_name (build_string ("wt"),
                                            Vtemporary_file_directory);
-             tempname = Fmake_temp_name (tempname);
+             tempname = make_temp_name (tempname, 1);
              args[0] = Vshell_file_name;
              args[1] = Qnil;
              args[2] = Qnil;
@@ -244,6 +250,7 @@ get_boot_time ()
    Ignore all reboot records on or before BOOT_TIME.
    Success is indicated by setting BOOT_TIME to a larger value.  */
 
+void
 get_boot_time_1 (filename, newest)
      char *filename;
      int newest;
@@ -255,11 +262,11 @@ get_boot_time_1 (filename, newest)
     {
       /* On some versions of IRIX, opening a nonexistent file name
         is likely to crash in the utmp routines.  */
-      desc = open (filename, O_RDONLY);
+      desc = emacs_open (filename, O_RDONLY, 0);
       if (desc < 0)
        return;
 
-      close (desc);
+      emacs_close (desc);
 
       utmpname (filename);
     }
@@ -309,9 +316,11 @@ 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 one for the null.  */
+   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
+   null.  */
 #define MAKE_LOCK_NAME(lock, file) \
-  (lock = (char *) alloca (STRING_BYTES (XSTRING (file)) + 2 + 1), \
+  (lock = (char *) alloca (STRING_BYTES (XSTRING (file)) + 2 + 1 + 1 + 1), \
    fill_in_lock_file_name (lock, (file)))
 
 static void
@@ -320,6 +329,8 @@ fill_in_lock_file_name (lockfile, fn)
      register Lisp_Object fn;
 {
   register char *p;
+  struct stat st;
+  int count = 0;
 
   strcpy (lockfile, XSTRING (fn)->data);
 
@@ -332,6 +343,18 @@ fill_in_lock_file_name (lockfile, fn)
   /* Insert the `.#'.  */
   p[1] = '.';
   p[2] = '#';
+
+  p = p + strlen (p);
+
+  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.
@@ -688,7 +711,7 @@ unlock_buffer (buffer)
     unlock_file (buffer->file_truename);
 }
 
-DEFUN ("file-locked-p", Ffile_locked_p, Sfile_locked_p, 0, 1, 0,
+DEFUN ("file-locked-p", Ffile_locked_p, Sfile_locked_p, 1, 1, 0,
   "Return nil if the FILENAME is not locked,\n\
 t if it is locked by you, else a string of the name of the locker.")
   (filename)