Pr 47431 CTIME/FDATE thread-safety using ctime_r()

From-SVN: r169338

libgfortran/ChangeLog

@@ -1,3 +1,15 @@
+2011-01-27  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR libfortran/47431
+	* config.h.in: Regenerated.
+	* configure: Regenerated.
+	* configure.ac: Add check for ctime_r().
+	* intrinsics/ctime.c (ctime_r): Fallback implementation.
+	(fdate): Use ctime_r() instead of ctime().
+	(fdate_sub): Likewise.
+	(ctime): Likewise.
+	(ctime_sub): Likewise.
+
 2011-01-27  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	PR libfortran/47432

libgfortran/config.h.in

@@ -318,6 +318,9 @@
 /* Define to 1 if you have the `ctime' function. */
 #undef HAVE_CTIME
 
+/* Define to 1 if you have the `ctime_r' function. */
+#undef HAVE_CTIME_R
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 

libgfortran/configure

@@ -16367,7 +16367,7 @@ _ACEOF
 fi
 done
 
-for ac_func in localtime_r gmtime_r strerror_r getpwuid_r ttyname_r
+for ac_func in localtime_r gmtime_r strerror_r getpwuid_r ttyname_r ctime_r
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

libgfortran/configure.ac

@@ -251,7 +251,7 @@ AC_CHECK_FUNCS(chdir strerror getlogin gethostname kill link symlink perror)
 AC_CHECK_FUNCS(sleep time ttyname signal alarm ctime clock access fork execl)
 AC_CHECK_FUNCS(wait setmode execvp pipe dup2 close fdopen strcasestr getrlimit)
 AC_CHECK_FUNCS(gettimeofday stat fstat lstat getpwuid vsnprintf dup getcwd)
-AC_CHECK_FUNCS(localtime_r gmtime_r strerror_r getpwuid_r ttyname_r)
+AC_CHECK_FUNCS(localtime_r gmtime_r strerror_r getpwuid_r ttyname_r ctime_r)
 
 # Check for glibc backtrace functions
 AC_CHECK_FUNCS(backtrace backtrace_symbols)

libgfortran/intrinsics/ctime.c

@@ -1,8 +1,8 @@
 /* Implementation of the CTIME and FDATE g77 intrinsics.
-   Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
    Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
 
-This file is part of the GNU Fortran 95 runtime library (libgfortran).
+This file is part of the GNU Fortran runtime library (libgfortran).
 
 Libgfortran is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public
@@ -41,6 +41,21 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include <string.h>
 
 
+#ifndef HAVE_CTIME_R
+static char *
+ctime_r (const time_t * timep, char * buf __attribute__((unused)))
+{
+#ifdef HAVE_CTIME
+  return ctime (timep);
+#else
+  return NULL;
+#endif
+}
+#endif
+
+/* ctime_r() buffer size needs to be at least 26 bytes.  */
+#define CSZ 26
+
 extern void fdate (char **, gfc_charlen_type *);
 export_proto(fdate);
 
@@ -48,9 +63,10 @@ void
 fdate (char ** date, gfc_charlen_type * date_len)
 {
 #if defined(HAVE_TIME) && defined(HAVE_CTIME)
+  char cbuf[CSZ];
   int i;
   time_t now = time(NULL);
-  *date = ctime (&now);
+  *date = ctime_r (&now, cbuf);
   if (*date != NULL)
     {
       *date = strdup (*date);
@@ -79,6 +95,7 @@ void
 fdate_sub (char * date, gfc_charlen_type date_len)
 {
 #if defined(HAVE_TIME) && defined(HAVE_CTIME)
+  char cbuf[CSZ];
   int i;
   char *d;
   time_t now = time(NULL);
@@ -86,7 +103,7 @@ fdate_sub (char * date, gfc_charlen_type date_len)
   
   memset (date, ' ', date_len);
 #if defined(HAVE_TIME) && defined(HAVE_CTIME)
-  d = ctime (&now);
+  d = ctime_r (&now, cbuf);
   if (d != NULL)
     {
       i = 0;
@@ -105,9 +122,10 @@ void
 PREFIX(ctime) (char ** date, gfc_charlen_type * date_len, GFC_INTEGER_8 t)
 {
 #if defined(HAVE_CTIME)
+  char cbuf[CSZ];
   time_t now = t;
   int i;
-  *date = ctime (&now);
+  *date = ctime_r (&now, cbuf);
   if (*date != NULL)
     {
       *date = strdup (*date);
@@ -136,6 +154,7 @@ void
 ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
 {
 #if defined(HAVE_CTIME)
+  char cbuf[CSZ];
   int i;
   char *d;
   time_t now = *t;
@@ -143,7 +162,7 @@ ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
   
   memset (date, ' ', date_len);
 #if defined(HAVE_CTIME)
-  d = ctime (&now);
+  d = ctime_r (&now, cbuf);
   if (d != NULL)
     {
       i = 0;