From 65e1775cd9d57cc660064e8a7cc34f94703278ac Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Wed, 14 Dec 2005 10:45:42 +0000
Subject: [PATCH] log() is now signal-safe.

---
 lib/lib.h      | 2 +-
 lib/log-file.c | 2 +-
 lib/log.c      | 9 ++++++---
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/lib.h b/lib/lib.h
index a5aef116..17944dbe 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -79,7 +79,7 @@
 
 extern char *log_title;			/* NULL - print no title, default is log_progname */
 extern char *log_filename;		/* Expanded name of the current log file */
-extern int log_switch_nest;		/* log_switch() nesting counter, increment to disable automatic switches */
+extern volatile int log_switch_nest;	/* log_switch() nesting counter, increment to disable automatic switches */
 extern int log_pid;			/* 0 if shouldn't be logged */
 extern void (*log_die_hook)(void);
 struct tm;
diff --git a/lib/log-file.c b/lib/log-file.c
index 83229669..7fc58392 100644
--- a/lib/log-file.c
+++ b/lib/log-file.c
@@ -19,7 +19,7 @@
 static char *log_name_patt;
 static int log_params;
 static int log_filename_size;
-int log_switch_nest;
+volatile int log_switch_nest;
 
 static int
 do_log_switch(struct tm *tm)
diff --git a/lib/log.c b/lib/log.c
index 88360004..084c72d7 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -27,19 +27,22 @@ void
 vlog_msg(unsigned int cat, const char *msg, va_list args)
 {
   time_t tim = time(NULL);
-  struct tm *tm = localtime(&tim);
+  struct tm tm;
   byte *buf, *p;
   int buflen = 256;
   int l, l0, r;
   va_list args2;
 
+  if (!localtime_r(&tim, &tm))
+    bzero(&tm, sizeof(tm));
+
   if (log_switch_hook)
-    log_switch_hook(tm);
+    log_switch_hook(&tm);
   while (1)
     {
       p = buf = alloca(buflen);
       *p++ = cat;
-      p += strftime(p, buflen, " %Y-%m-%d %H:%M:%S ", tm);
+      p += strftime(p, buflen, " %Y-%m-%d %H:%M:%S ", &tm);
       if (log_title)
 	{
 	  if (log_pid)
-- 
2.39.2