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[Lost] [Patch] Signale



Hier ein Patch der LOST die wichtigsten Funktionen für Posix-Signale
beibringt. Dabei wird der bisherige signal-Syscall entfernt. Die  neue
implementierung funktioniert über send_message.
Index: src/modules/include/syscall.h
===================================================================
--- src/modules/include/syscall.h	(Revision 589)
+++ src/modules/include/syscall.h	(Arbeitskopie)
@@ -43,7 +43,6 @@
 void add_intr_handler(dword intr);
 
 void rpc(pid_t pid);
-void signal(pid_t pid, dword signal);
 void send_message(pid_t pid, dword function, dword correlation_id, dword len, char* data);
 void wait_for_rpc();
 void v_and_wait_for_rpc();
Index: src/modules/lib/syscalls/rpc.c
===================================================================
--- src/modules/lib/syscalls/rpc.c	(Revision 589)
+++ src/modules/lib/syscalls/rpc.c	(Arbeitskopie)
@@ -16,22 +16,6 @@
     } while (result != 0);
 }
 
-void signal(dword pid, dword signal) 
-{
-    dword result = 0;
-
-    do {
-        asm(
-            "pushl %2;"
-            "pushl $4;"
-            "pushl %1;"
-            "mov $51, %%eax;"
-            "int $0x30;"
-            "add $0xb, %%esp;"
-        : "=a" (result) : "g" (pid), "g" (signal + 256), "0" (result));
-    } while (result != 0);
-}
-
 void send_message(dword pid, dword function, dword correlation_id, dword len, char* data)
 {
     dword result = 0;
Index: src/modules/lib/rpc/messaging.c
===================================================================
--- src/modules/lib/rpc/messaging.c	(Revision 590)
+++ src/modules/lib/rpc/messaging.c	(Arbeitskopie)
@@ -37,6 +37,7 @@
 #include "rpc.h"
 #include "syscall.h"
 #include "string.h"
+#include <signal.h>
 
 // Diese Deklaration ist so eigentlich nicht richtig, der RPC-Handler nimmt
 // durchaus Parameter. Allerdings folgt das ganze sowieso nicht dem
@@ -168,5 +169,8 @@
     } else if (function == RPC_TIMER) {
         // Ein Timer ist abgelaufen
         timer_callback(correlation_id);                
+    } else if (function == RPC_SIGNAL) {
+        raise(correlation_id);
     }
+
 }
Index: src/modules/include/signal.h
===================================================================
--- src/modules/include/signal.h	(Revision 0)
+++ src/modules/include/signal.h	(Revision 0)
@@ -0,0 +1,132 @@
+/*  
+ * Copyright (c) 2007 The LOST Project. All rights reserved.
+ *
+ * This code is derived from software contributed to the LOST Project
+ * by Antoine Kaufmann.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the LOST Project
+ *     and its contributors.
+ * 4. Neither the name of the LOST Project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR 
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */  
+
+#ifndef _SIGNAL_H_
+#define _SIGNAL_H_
+#include <sys/types.h>
+
+// Signale
+
+/// Verbindung zu Terminal Verloren
+#define SIGHUP 1
+
+/// Unterbrechung vom Benutzer angeforder (Ctrl + C)
+#define SIGINT 2
+
+/// TODO
+#define SIGQUIT 3
+
+/// Fehlerhafte Instruktion
+#define SIGILL 4
+
+/// Debug
+#define SIGTRAP 5
+
+/// Prozess terminieren (Kann zwar abgefangen werden, aber nach abarbeiten der
+/// Routine wird der Prozess trotzdem beendet).
+#define SIGABRT 6
+
+/// TODO
+#define SIGBUS 7
+
+/// Fehler bei einer arithmetischen Operation
+#define SIGFPE 8
+
+/// Prozess terminieren (kann _nicht_ abgefangen werden)
+#define SIGKILL 9
+
+/// Benutzerdefiniertes Signal 1
+#define SIGUSR1 10
+
+/// Speicherzugriffsfehler
+#define SIGSEGV 11
+
+/// Benutzerdefiniertes Signal 2
+#define SIGUSR2 12
+
+/// Pipe-Fehler
+#define SIGPIPE 13
+
+/// TODO
+#define SIGALRM 14
+
+/// Prozess terminieren (kann abgefangen werden)
+#define SIGTERM 15
+
+/// LOST-Spezifisches Signal: Eingabedaten auf Terminal bereit
+#define SIGTERMINPUT 31
+
+/// Start des frei verwendbaren Bereichs
+#define SIGRTMIN 32
+
+/// Ende des frei verwendbaren Bereichs
+#define SIGRTMAX 63
+
+// Hier sollte noch viel mehr kommen
+
+/// Nur fuer interne Verwendung. Muss immer 1 groesser sein als die groesste
+/// Signalnummer und teilbar durch 8
+#define _SIGNO_MAX 64
+
+
+
+// Gehoert nach Spezifikation da nicht rein.
+void _signal_default_handler(int signal);
+
+/// Standard-Signalhandler
+#define SIG_DFL (&_signal_default_handler)
+
+/// Das gibt signal im Fehlerfall zurueck
+#define SIG_ERR (NULL)
+
+/// Signalhandler fuer ignonierte Signale
+#define SIG_IGN (NULL)
+
+
+
+/// Typ fuer einen Pointer auf einen Signal-Handler
+typedef void (*sighandler_t)(int);
+
+/// Einen Signal-Hander aendern
+sighandler_t signal(int signum, sighandler_t handler);
+
+/// Ein Signal zum aktuellen Prozess senden
+int raise(int signal);
+
+/// Ein Signal an einen anderen Prozess senden
+int kill(pid_t pid, int signal);
+
+#endif // ifndef _SIGNAL_H_
+
Index: src/modules/lib/posix/signal.c
===================================================================
--- src/modules/lib/posix/signal.c	(Revision 0)
+++ src/modules/lib/posix/signal.c	(Revision 0)
@@ -0,0 +1,177 @@
+/*  
+ * Copyright (c) 2007 The LOST Project. All rights reserved.
+ *
+ * This code is derived from software contributed to the LOST Project
+ * by Antoine Kaufmann.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the LOST Project
+ *     and its contributors.
+ * 4. Neither the name of the LOST Project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR 
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <collections.h>
+#include <rpc.h>
+#include <syscall.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+/// Array mit Pointern auf die Signal-Handler
+static sighandler_t signal_handlers [_SIGNO_MAX];
+bool initialized = FALSE;
+
+/**
+ * Signale initialisieren
+ */
+void init_signals()
+{
+    int i;
+    for (i = 0; i < _SIGNO_MAX; i++) {
+        signal_handlers[i] = SIG_DFL;
+    }
+
+    initialized = TRUE;
+}
+
+/**
+ * Ein Signal an den aktuellen Prozess senden
+ *
+ * @param signum Signalnummer
+ *
+ * @return 0 bei Erfolg, != 0 im Fehlerfall
+ */
+int raise(int signum)
+{
+    // Falls die Liste noch nicht initialisiert ist, wird das jetzt gemacht
+    if (initialized == FALSE) {
+        init_signals();
+    }
+
+    // Wenn das Signal Groesser ist als die Groesste gueltige wird sofort
+    // abgebrochen.
+    if (signum >= _SIGNO_MAX) {
+        return -1;
+    }
+
+    sighandler_t handler = signal_handlers[signum];
+    if (handler != NULL) {
+        handler(signum);
+    }
+    return 0;
+}
+
+/**
+ * Ein Signal an einen anderen Prozess senden
+ *
+ * @param pid Prozessnummer
+ * @param signum Signalnummer
+ *
+ * @return 0 bei Erfolg, != 0 im Fehlerfall
+ */
+int kill(pid_t pid, int signum)
+{
+    send_message(pid, RPC_SIGNAL, signum, 0, NULL);
+    return 0;
+}
+
+/**
+ * Standard-Handler fuer Signale
+ *
+ * @param signum Signalnummer
+ */
+void _signal_default_handler(int signum)
+{
+    printf("Signal %d\n", signum);
+
+    switch (signum) {
+        // Signale die den Prozess mit Schnickschnack wie Core-File beenden
+        // (TODO)
+        case SIGQUIT:
+        case SIGILL:
+        case SIGTRAP:
+        case SIGABRT:
+        case SIGBUS:
+        case SIGFPE:
+        case SIGSEGV:
+            // Hier koennte man jetzt jede Menge debug-Zeug einbauen wie
+            // core-Dumps und sowas ;-)
+            // Und das break fehlt hier auch absichtlich!
+
+        // Signale die einfach nur den Prozess beenden
+        case SIGHUP:
+        case SIGINT:
+        case SIGKILL:
+        case SIGUSR1:
+        case SIGUSR2:
+        case SIGPIPE:
+        case SIGALRM:
+        case SIGTERM:
+            _exit(EXIT_FAILURE);
+            break;
+        // TODO: Dinge wie Prozess anhalten und wieder starten
+    }
+}
+
+/**
+ * Handler fuer ein ignoriertes Signal
+ *
+ * @param signum Signalnummer
+ */
+void _signnal_ignore_handler(int signum)
+{
+}
+
+/**
+ * Handler fuer ein bestimmtes Signal aendern
+ *
+ * @param signum Nummer des Signals
+ * @param handler Neuer Handler
+ *
+ * @return Vorheriger Signalhandler bei Erfolg, SIG_ERR im Fehlerfall
+ */
+sighandler_t signal(int signum, sighandler_t handler)
+{
+    // Initialisieren falls das noch nicht gemacht ist
+    if (initialized == FALSE) {
+        init_signals();
+    }
+    
+    // Ungueltige Signale und SIGKILL koennen nicht gesetzt werden
+    if ((signum >= _SIGNO_MAX) || (signum == SIGKILL)) {
+        return SIG_ERR;
+    }    
+
+    // Alter Handler Speichern, weil er zurueck gegeben wird
+    sighandler_t old_handler = signal_handlers[signum];
+    
+    // Neuer setzen
+    signal_handlers[signum] = handler;
+
+    return old_handler;
+}