(svn r17453) -Add: crash logger for all Unixy OSes; should work for all, but I don't have all exotic machines so it might break compilation on the more exotic configurations

2 files changed, 173 insertions, 0 deletions

diff --git a/src/os/unix/crashlog_unix.cpp b/src/os/unix/crashlog_unix.cpp
new file mode 100644
index 000000000..73644ba8d
--- /dev/null
+++ b/src/os/unix/crashlog_unix.cpp
@@ -0,0 +1,171 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file crashlog_unix.cpp Unix crash log handler */
+
+#include "../../stdafx.h"
+#include "../../crashlog.h"
+#include "../../string_func.h"
+#include "../../gamelog.h"
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/utsname.h>
+
+#if defined(__GLIBC__)
+/* Execinfo (and thus making stacktraces) is a GNU extension */
+#	include <execinfo.h>
+#elif defined(SUNOS)
+#	include <ucontext.h>
+#	include <dlfcn.h>
+#endif
+
+/**
+ * Unix implementation for the crash logger.
+ */
+class CrashLogUnix : public CrashLog {
+	/** Signal that has been thrown. */
+	int signum;
+
+	/* virtual */ char *LogOSVersion(char *buffer, const char *last) const
+	{
+		struct utsname name;
+		if (uname(&name) < 0) {
+			return buffer + seprintf(buffer, last, "Could not get OS version: %s\n", strerror(errno));
+		}
+
+		return buffer + seprintf(buffer, last,
+				"Operating system:\n"
+				" Name:    %s\n"
+				" Release: %s\n"
+				" Version: %s\n"
+				" Machine: %s\n\n",
+				name.sysname,
+				name.release,
+				name.version,
+				name.machine
+		);
+	}
+
+	/* virtual */ char *LogError(char *buffer, const char *last, const char *message) const
+	{
+		return buffer + seprintf(buffer, last,
+				"Crash reason:\n"
+				" Signal:  %s (%d)\n"
+				" Message: %s\n\n",
+				strsignal(this->signum),
+				this->signum,
+				message == NULL ? "<none>" : message
+		);
+	}
+
+#if defined(SUNOS)
+	/** Data needed while walking up the stack */
+	struct StackWalkerParams {
+		char **bufptr;    ///< Buffer
+		const char *last; ///< End of buffer
+		int counter;      ///< We are at counter-th stack level
+	};
+
+	/**
+	 * Callback used while walking up the stack.
+	 * @param pc program counter
+	 * @param sig 'active' signal (unused)
+	 * @param params parameters
+	 * @return always 0, continue walking up the stack
+	 */
+	static int SunOSStackWalker(uintptr_t pc, int sig, void *params)
+	{
+		StackWalkerParams *wp = (StackWalkerParams *)params;
+
+		/* Resolve program counter to file and nearest symbol (if possible) */
+		Dl_info dli;
+		if (dladdr((void *)pc, &dli) != 0) {
+			*wp->bufptr += seprintf(*wp->bufptr, wp->last, " [%02i] %s(%s+0x%x) [0x%x]\n",
+					wp->counter, dli.dli_fname, dli.dli_sname, (int)((byte *)pc - (byte *)dli.dli_saddr), (uint)pc);
+		} else {
+			*wp->bufptr += seprintf(*wp->bufptr, wp->last, " [%02i] [0x%x]\n", wp->counter, (uint)pc);
+		}
+		wp->counter++;
+
+		return 0;
+	}
+#endif
+
+	/* virtual */ char *LogStacktrace(char *buffer, const char *last) const
+	{
+		buffer += seprintf(buffer, last, "Stacktrace:\n");
+#if defined(__GLIBC__)
+		void *trace[64];
+		int trace_size = backtrace(trace, lengthof(trace));
+
+		char **messages = backtrace_symbols(trace, trace_size);
+		for (int i = 0; i < trace_size; i++) {
+			buffer += seprintf(buffer, last, " [%02i] %s\n", i, messages[i]);
+		}
+		free(messages);
+#elif defined(SUNOS)
+		ucontext_t uc;
+		if (getcontext(&uc) != 0) {
+			buffer += seprintf(buffer, last, " getcontext() failed\n\n");
+			return buffer;
+		}
+
+		StackWalkerParams wp = { &buffer, last, 0 };
+		walkcontext(&uc, &CrashLogUnix::SunOSStackWalker, &wp);
+#else
+		buffer += seprintf(buffer, last, " Not supported.\n");
+#endif
+		return buffer + seprintf(buffer, last, "\n");
+	}
+public:
+	/**
+	 * A crash log is always generated by signal.
+	 * @param signum the signal that was caused by the crash.
+	 */
+	CrashLogUnix(int signum) :
+		signum(signum)
+	{
+	}
+};
+
+/** The signals we want our crash handler to handle. */
+static const int _signals_to_handle[] = { SIGSEGV, SIGABRT, SIGFPE, SIGBUS };
+
+/**
+ * Entry point for the crash handler.
+ * @note Not static so it shows up in the backtrace.
+ * @param signum the signal that caused us to crash.
+ */
+void CDECL HandleCrash(int signum)
+{
+	/* Disable all handling of signals by us, so we don't go into infinite loops. */
+	for (const int *i = _signals_to_handle; i != endof(_signals_to_handle); i++) {
+		signal(*i, SIG_DFL);
+	}
+
+	if (GamelogTestEmergency()) {
+		printf("A serious fault condition occured in the game. The game will shut down.\n");
+		printf("As you loaded an emergency savegame no crash information will be generated.\n");
+		exit(3);
+	}
+
+	CrashLogUnix log(signum);
+	log.MakeCrashLog();
+
+	CrashLog::AfterCrashLogCleanup();
+	exit(2);
+}
+
+/* static */ void CrashLog::InitialiseCrashLog()
+{
+	for (const int *i = _signals_to_handle; i != endof(_signals_to_handle); i++) {
+		signal(*i, HandleCrash);
+	}
+}
diff --git a/src/os/unix/unix.cpp b/src/os/unix/unix.cpp
index bbe916c57..ee4388aa5 100644
--- a/src/os/unix/unix.cpp
+++ b/src/os/unix/unix.cpp
@@ -15,6 +15,7 @@
 #include "../../textbuf_gui.h"
 #include "../../functions.h"
 #include "../../core/random_func.hpp"
+#include "../../crashlog.h"
 
 #include "table/strings.h"
 
@@ -254,6 +255,7 @@ int CDECL main(int argc, char *argv[])
 		argc = 1;
 	}
 #endif
+	CrashLog::InitialiseCrashLog();
 
 	SetRandomSeed(time(NULL));