(print_error_message): Print data of `end-of-file'

[gnu-emacs] / src / filelock.c

diff --git a/src/filelock.c b/src/filelock.c
index dcf3c658ce004fa3933b0afaf999575598cef34d..02b3ccc8b05ad330d941661f51fd8cdd082e1792 100644 (file)
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -19,10 +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 VMS
 #include "vms-pwd.h"
@@ -58,6 +59,10 @@ Boston, MA 02111-1307, USA.  */
 extern int errno;
 #endif
 
+/* The directory for writing temporary files.  */
+
+Lisp_Object Vtemporary_file_directory;
+
 #ifdef CLASH_DETECTION
 
 #include <utmp.h>
@@ -115,10 +120,16 @@ 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 ()
 {
+#if defined (BOOT_TIME) && ! defined (NO_WTMP_FILE)
   int counter;
+#endif
 
   if (boot_time_initialized)
     return boot_time;
@@ -192,7 +203,9 @@ get_boot_time ()
          if (! NILP (Ffile_exists_p (tempname)))
            {
              Lisp_Object args[6];
-             tempname = Fmake_temp_name (build_string ("wtmp"));
+             tempname = Fexpand_file_name (build_string ("wtmp"),
+                                           Vtemporary_file_directory);
+             tempname = Fmake_temp_name (tempname);
              args[0] = Vshell_file_name;
              args[1] = Qnil;
              args[2] = Qnil;
@@ -232,6 +245,7 @@ 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;
@@ -243,11 +257,11 @@ 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);
     }
@@ -297,9 +311,11 @@ 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
@@ -308,6 +324,8 @@ 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);
 
@@ -320,6 +338,18 @@ 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.
@@ -388,7 +418,7 @@ current_lock_owner (owner, lfname)
 #ifndef index
   extern char *rindex (), *index ();
 #endif
-  int o, p, len, ret;
+  int len, ret;
   int local_owner = 0;
   char *at, *dot, *colon;
   char *lfinfo = 0;
@@ -514,6 +544,8 @@ lock_if_free (clasher, lfname)
         }
       else if (locker == 1)
         return 1;  /* Someone else has it.  */
+      else if (locker == -1)
+       return -1;   /* current_lock_owner returned strange error.  */
 
       /* We deleted a stale lock; try again to lock the file.  */
     }
@@ -544,6 +576,7 @@ lock_file (fn)
   register Lisp_Object attack, orig_fn, encoded_fn;
   register char *lfname, *locker;
   lock_info_type lock_info;
+  struct gcpro gcpro1;
 
   /* Don't do locking while dumping Emacs.
      Uncompressing wtmp files uses call-process, which does not work
@@ -552,6 +585,7 @@ lock_file (fn)
     return;
 
   orig_fn = fn;
+  GCPRO1 (fn);
   fn = Fexpand_file_name (fn, Qnil);
   encoded_fn = ENCODE_FILE (fn);
 
@@ -562,18 +596,16 @@ lock_file (fn)
      visited.  */
   {
     register Lisp_Object subject_buf;
-    struct gcpro gcpro1;
 
     subject_buf = get_truename_buffer (orig_fn);
-    GCPRO1 (fn);
 
     if (!NILP (subject_buf)
        && NILP (Fverify_visited_file_modtime (subject_buf))
        && !NILP (Ffile_exists_p (fn)))
       call1 (intern ("ask-user-about-supersession-threat"), fn);
 
-    UNGCPRO;
   }
+  UNGCPRO;
 
   /* Try to lock the lock. */
   if (lock_if_free (&lock_info, lfname) <= 0)
@@ -618,9 +650,9 @@ unlock_all_files ()
   register Lisp_Object tail;
   register struct buffer *b;
 
-  for (tail = Vbuffer_alist; GC_CONSP (tail); tail = XCONS (tail)->cdr)
+  for (tail = Vbuffer_alist; GC_CONSP (tail); tail = XCDR (tail))
     {
-      b = XBUFFER (XCONS (XCONS (tail)->car)->cdr);
+      b = XBUFFER (XCDR (XCAR (tail)));
       if (STRINGP (b->file_truename) && BUF_SAVE_MODIFF (b) < BUF_MODIFF (b))
        {
          register char *lfname;
@@ -674,7 +706,7 @@ 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)
@@ -715,6 +747,10 @@ init_filelock ()
 void
 syms_of_filelock ()
 {
+  DEFVAR_LISP ("temporary-file-directory", &Vtemporary_file_directory,
+    "The directory for writing temporary files.");
+  Vtemporary_file_directory = Qnil;
+
   defsubr (&Sunlock_buffer);
   defsubr (&Slock_buffer);
   defsubr (&Sfile_locked_p);