* gdbserver/remote-utils.c (remote_open): Set gdbserver as "owner"

of SIGIO.
(input_interrupt): Don't block on read, in case we got redundant
SIGIO.  Don't gripe about redundant SIGIO.
* gdbserver/low-hppabsd.c (mywait): Use waitpid().  Enable SIGIO
handler while waiting.
* gdbserver/low-linux.c (mywait): Likewise.
* gdbserver/low-nbsd.c (mywait): Likewise.
* gdbserver/low-sparc.c (mywait): Likewise.

1 files changed, 26 insertions, 10 deletions

diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c
index f486b10..19f6715 100644
--- a/gdb/gdbserver/remote-utils.c
+++ b/gdb/gdbserver/remote-utils.c
@@ -1,5 +1,5 @@
 /* Remote utility routines for the remote server for GDB.
-   Copyright 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
+   Copyright 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
    Free Software Foundation, Inc.
 
    This file is part of GDB.
@@ -32,6 +32,8 @@
 #include <sys/ioctl.h>
 #include <signal.h>
 #include <fcntl.h>
+#include <sys/time.h>
+#include <unistd.h>
 
 int remote_debug = 0;
 struct ui_file *gdb_stdlog;
@@ -156,8 +158,11 @@ remote_open (char *name)
 #if defined(F_SETFL) && defined (FASYNC)
   save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0);
   fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC);
+#endif
+#if defined (F_SETOWN)
+  fcntl (remote_desc, F_SETOWN, getpid ());
+#endif
   disable_async_io ();
-#endif /* FASYNC */
   fprintf (stderr, "Remote debugging using %s\n", name);
 }
 
@@ -261,18 +266,29 @@ putpkt (char *buf)
 static void
 input_interrupt (void)
 {
-  int cc;
-  char c;
+  fd_set readset;
+  struct timeval immediate = { 0, 0 };
 
-  cc = read (remote_desc, &c, 1);
+  /* Protect against spurious interrupts.  This has been observed to
+     be a problem under NetBSD 1.4 and 1.5.  */
 
-  if (cc != 1 || c != '\003')
+  FD_ZERO (&readset);
+  FD_SET (remote_desc, &readset);
+  if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0)
     {
-      fprintf (stderr, "input_interrupt, cc = %d c = %d\n", cc, c);
-      return;
-    }
+      int cc;
+      char c;
+      
+      cc = read (remote_desc, &c, 1);
 
-  kill (inferior_pid, SIGINT);
+      if (cc != 1 || c != '\003')
+	{
+	  fprintf (stderr, "input_interrupt, cc = %d c = %d\n", cc, c);
+	  return;
+	}
+      
+      kill (inferior_pid, SIGINT);
+    }
 }
 
 void