This commit was generated by cvs2svn to compensate for changes in r2,

which included commits to RCS files with non-trunk default branches.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 105 insertions, 0 deletions

diff --git a/linux-user/signal.c b/linux-user/signal.c
new file mode 100644
index 0000000000..2e0d599553
--- /dev/null
+++ b/linux-user/signal.c
@@ -0,0 +1,105 @@
+/*
+ *  Emulation of Linux signal handling
+ * 
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <signal.h>
+#include <sys/ucontext.h>
+
+/* Algorithm strongly inspired from em86 : we queue the signals so
+   that we can handle them at precise points in the emulated code. */
+
+struct emulated_sigaction {
+    struct target_sigaction sa;
+    int nb_pending;
+    struct target_siginfo info;
+};
+
+struct emulated_sigaction sigact_table[NSIG];
+int signal_pending;
+
+static inline int host_to_target_signal(int sig)
+{
+    return sig;
+}
+
+static inline int target_to_host_signal(int sig)
+{
+    return sig;
+}
+
+void signal_init(void)
+{
+    struct sigaction act;
+    int i;
+
+    /* set all host signal handlers */
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_SIGINFO;
+    act.sa_sigaction = host_signal_handler;
+    for(i = 1; i < NSIG; i++) {
+	sigaction(i, &sa, NULL);
+    }
+    
+    memset(sigact_table, 0, sizeof(sigact_table));
+}
+
+static void host_signal_handler(int host_signum, siginfo_t *info, 
+                                void *puc)
+{
+    struct ucontext *uc = puc;
+    int signum;
+    /* get target signal number */
+    signum = host_to_target(host_signum);
+    if (signum >= TARGET_NSIG)
+        return;
+    /* we save the old mask */
+    
+    
+}
+
+
+void process_pending_signals(void)
+{
+    int signum;
+    target_ulong _sa_handler;
+
+    struct emulated_sigaction *esig;
+
+    if (!signal_pending)
+        return;
+
+    esig = sigact_table;
+    for(signum = 1; signum < TARGET_NSIG; signum++) {
+        if (esig->nb_pending != 0)
+            goto handle_signal;
+        esig++;
+    }
+    /* if no signal is pending, just return */
+    signal_pending = 0;
+    return;
+ handle_signal:
+    _sa_handler = esig->sa._sa_handler;
+    if (_sa_handler == TARGET_SIG_DFL) {
+        /* default handling
+    }
+
+
+}