memtrap: add new logic to trap and handle SIGBUS

1 files changed, 69 insertions, 0 deletions

diff --git a/src/tests/sigbus-test.c b/src/tests/sigbus-test.c
new file mode 100644
index 00000000..dec4f0f2
--- /dev/null
+++ b/src/tests/sigbus-test.c
@@ -0,0 +1,69 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2009 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio 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 Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#include <pulsecore/memtrap.h>
+#include <pulsecore/core-util.h>
+
+int main(int argc, char *argv[]) {
+    void *p;
+    int fd;
+    pa_memtrap *m;
+
+    pa_log_set_level(PA_LOG_DEBUG);
+
+    /* Create the memory map */
+    pa_assert_se((fd = open("sigbus-test-map", O_RDWR|O_TRUNC|O_CREAT, 0660)) >= 0);
+    pa_assert_se(unlink("sigbus-test-map") == 0);
+    pa_assert_se(ftruncate(fd, PA_PAGE_SIZE) >= 0);
+    pa_assert_se((p = mmap(NULL, PA_PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) != MAP_FAILED);
+
+    /* Register memory map */
+    m = pa_memtrap_add(p, PA_PAGE_SIZE);
+
+    /* Use memory map */
+    pa_snprintf(p, PA_PAGE_SIZE, "This is a test that should work fine.");
+
+    /* Verify memory map */
+    pa_log("Let's see if this worked: %s", (char*) p);
+    pa_log("And memtrap says it is good: %s", pa_yes_no(pa_memtrap_is_good(m)));
+
+    /* Invalidate mapping */
+    pa_assert_se(ftruncate(fd, 0) >= 0);
+
+    /* Use memory map */
+    pa_snprintf(p, PA_PAGE_SIZE, "This is a test that should fail but get caught.");
+
+    /* Verify memory map */
+    pa_log("Let's see if this worked: %s", (char*) p);
+    pa_log("And memtrap says it is good: %s", pa_yes_no(pa_memtrap_is_good(m)));
+
+    pa_memtrap_remove(m);
+    munmap(p, PA_PAGE_SIZE);
+
+    return 0;
+}