[project @ 2004-02-27 13:35:16 by simonmar]

[ghc-hetmet.git] / ghc / rts / RtsStartup.c

diff --git a/ghc/rts/RtsStartup.c b/ghc/rts/RtsStartup.c
index 0c5c2a3..5255386 100644 (file)
--- a/ghc/rts/RtsStartup.c
+++ b/ghc/rts/RtsStartup.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: RtsStartup.c,v 1.75 2003/08/22 22:24:15 sof Exp $
+ * $Id: RtsStartup.c,v 1.79 2004/02/27 13:35:16 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2002
  *
@@ -60,12 +60,39 @@
 #include <locale.h>
 #endif
 
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
 // Flag Structure
 struct RTS_FLAGS RtsFlags;
 
 // Count of how many outstanding hs_init()s there have been.
 static int hs_init_count = 0;
 
+// Here we save the terminal settings on the standard file
+// descriptors, if we need to change them (eg. to support NoBuffering
+// input).
+static void *saved_termios[3] = {NULL,NULL,NULL};
+
+void*
+__hscore_get_saved_termios(int fd)
+{
+  return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
+    saved_termios[fd] : NULL;
+}
+
+void
+__hscore_set_saved_termios(int fd, void* ts)
+{
+  if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
+    saved_termios[fd] = ts;
+  }
+}
+
 /* -----------------------------------------------------------------------------
    Starting up the RTS
    -------------------------------------------------------------------------- */
@@ -297,14 +324,14 @@ hs_exit(void)
     /* start timing the shutdown */
     stat_startExit();
     
-    /* stop all running tasks */
-    exitScheduler();
-    
 #if !defined(GRAN)
     /* Finalize any remaining weak pointers */
     finalizeWeakPointersNow();
 #endif
     
+    /* stop all running tasks */
+    exitScheduler();
+    
 #if defined(GRAN)
     /* end_gr_simulation prints global stats if requested -- HWL */
     if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
@@ -319,6 +346,27 @@ hs_exit(void)
     resetNonBlockingFd(1);
     resetNonBlockingFd(2);
 
+#if HAVE_TERMIOS_H
+    // Reset the terminal settings on the standard file descriptors,
+    // if we changed them.  See System.Posix.Internals.tcSetAttr for
+    // more details, including the reason we termporarily disable
+    // SIGTTOU here.
+    { 
+       int fd;
+       sigset_t sigset, old_sigset;
+       sigemptyset(&sigset);
+       sigaddset(&sigset, SIGTTOU);
+       sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
+       for (fd = 0; fd <= 2; fd++) {
+           struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
+           if (ts != NULL) {
+               tcsetattr(fd,TCSANOW,ts);
+           }
+       }
+       sigprocmask(SIG_SETMASK, &old_sigset, NULL);
+    }
+#endif
+
 #if defined(PAR)
     /* controlled exit; good thread! */
     shutdownParallelSystem(0);