Vendor import of lldb trunk r256945:

https://llvm.org/svn/llvm-project/lldb/trunk@256945

1 files changed, 58 insertions, 0 deletions

diff --git a/packages/Python/lldbsuite/test/functionalities/signal/handle-segv/main.c b/packages/Python/lldbsuite/test/functionalities/signal/handle-segv/main.c
new file mode 100644
index 0000000..27d9b8e
--- /dev/null
+++ b/packages/Python/lldbsuite/test/functionalities/signal/handle-segv/main.c
@@ -0,0 +1,58 @@
+#include <sys/mman.h>
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+enum {
+    kMmapSize = 0x1000,
+    kMagicValue = 47,
+};
+
+void *address;
+volatile sig_atomic_t signaled = 0;
+
+void handler(int sig)
+{
+    signaled = 1;
+    if (munmap(address, kMmapSize) != 0)
+    {
+        perror("munmap");
+        _exit(5);
+    }
+
+    void* newaddr = mmap(address, kMmapSize, PROT_READ | PROT_WRITE,
+            MAP_ANON | MAP_FIXED | MAP_PRIVATE, -1, 0);
+    if (newaddr != address)
+    {
+        fprintf(stderr, "Newly mmaped address (%p) does not equal old address (%p).\n",
+                newaddr, address);
+        _exit(6);
+    }
+    *(int*)newaddr = kMagicValue;
+}
+
+int main()
+{
+    if (signal(SIGSEGV, handler) == SIG_ERR)
+    {
+        perror("signal");
+        return 1;
+    }
+
+    address = mmap(NULL, kMmapSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
+    if (address == MAP_FAILED)
+    {
+        perror("mmap");
+        return 2;
+    }
+
+    // This should first trigger a segfault. Our handler will make the memory readable and write
+    // the magic value into memory.
+    if (*(int*)address != kMagicValue)
+        return 3;
+
+    if (! signaled)
+        return 4;
+
+    return 0;
+}