re PR libfortran/48961 (EXECUTE_COMMAND_LINE(WAIT=.false.) fails on MinGW)

2011-05-14  Tobias Burnus  <burnus@net-b.de>

        PR fortran/48961
        * intrinsics/execute_command_line.c (set_cmdstat): Don't abort if
        synchronously executing with WAIT=.false.
        (execute_command_line): Fix setting of cmdstat and exitstat.

From-SVN: r173748

libgfortran/ChangeLog

+2011-05-14  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/48961
+	* intrinsics/execute_command_line.c (set_cmdstat): Don't abort if
+	synchronously executing with WAIT=.false.
+	(execute_command_line): Fix setting of cmdstat and exitstat.
+
 2011-05-06  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/18918

libgfortran/intrinsics/execute_command_line.c

@@ -38,9 +38,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif
 
 
-enum { EXEC_NOERROR = 0, EXEC_SYSTEMFAILED };
+enum { EXEC_SYNCHRONOUS = -2, EXEC_NOERROR = 0, EXEC_SYSTEMFAILED,
+       EXEC_CHILDFAILED };
 static const char *cmdmsg_values[] =
-  { "", "Execution of child process impossible" };
+  { "",
+    "Termination status of the command-language interpreter cannot be obtained",
+    "Execution of child process impossible" };
 
 
 
@@ -49,7 +52,7 @@ set_cmdstat (int *cmdstat, int value)
 {
   if (cmdstat)
     *cmdstat = value;
-  else if (value != 0)
+  else if (value > EXEC_NOERROR)
     runtime_error ("Could not execute command line");
 }
 
@@ -74,10 +77,10 @@ execute_command_line (const char *command, bool wait, int *exitstat,
       /* Asynchronous execution.  */
       pid_t pid;
 
-      set_cmdstat (cmdstat, 0);
+      set_cmdstat (cmdstat, EXEC_NOERROR);
 
       if ((pid = fork()) < 0)
-	set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
+	set_cmdstat (cmdstat, EXEC_CHILDFAILED);
       else if (pid == 0)
 	{
 	  /* Child process.  */
@@ -91,13 +94,15 @@ execute_command_line (const char *command, bool wait, int *exitstat,
       /* Synchronous execution.  */
       int res = system (cmd);
 
-      if (!wait)
-	set_cmdstat (cmdstat, -2);
-      else if (res == -1)
+      if (res == -1)
 	set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
+      else if (!wait)
+	set_cmdstat (cmdstat, EXEC_SYNCHRONOUS);
       else
+	set_cmdstat (cmdstat, EXEC_NOERROR);
+
+      if (res != -1)
 	{
-	  set_cmdstat (cmdstat, 0);
 #if defined(WEXITSTATUS) && defined(WIFEXITED)
 	  *exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res;
 #else
@@ -107,7 +112,7 @@ execute_command_line (const char *command, bool wait, int *exitstat,
     }
 
   /* Now copy back to the Fortran string if needed.  */
-  if (cmdstat && *cmdstat > 0)
+  if (cmdstat && *cmdstat > EXEC_NOERROR)
     {
       if (cmdmsg)
 	fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],