From 6b7668dc83121e01fb832fec489d2fb0188394e6 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Sat, 27 Jun 2020 14:50:59 +0100
Subject: [PATCH] CMake: Add sigaction, sigaltstack, self dbg

---
 CMakeLists.txt              |  3 +++
 cmake/FindSelfDbg.cmake     | 37 +++++++++++++++++++++++++++++++++++++
 cmake/FindSigaction.cmake   | 26 ++++++++++++++++++++++++++
 cmake/FindSigaltstack.cmake | 21 +++++++++++++++++++++
 4 files changed, 87 insertions(+)
 create mode 100644 cmake/FindSelfDbg.cmake
 create mode 100644 cmake/FindSigaction.cmake
 create mode 100644 cmake/FindSigaltstack.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac8bb6523f..7d1d9a27fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,9 @@ endif (MSVC)
 if (UNIX)
     find_package(DL)
     find_package(Demangle)
+    find_package(Sigaction)
+    find_package(Sigaltstack)
+    find_package(SelfDbg)
 endif (UNIX)
 
 find_package(SSE)
diff --git a/cmake/FindSelfDbg.cmake b/cmake/FindSelfDbg.cmake
new file mode 100644
index 0000000000..0f4aec61cb
--- /dev/null
+++ b/cmake/FindSelfDbg.cmake
@@ -0,0 +1,37 @@
+include(CheckCXXSourceCompiles)
+
+check_cxx_source_compiles("
+    #include <unistd.h>
+    #include <sys/stat.h>
+    #include <fcntl.h>
+    #include <sys/syscall.h>
+    #include <sys/types.h>
+    #include <sys/wait.h>
+    int main() {
+        pid_t tid = syscall(SYS_gettid);
+        int status;
+        waitpid((pid_t) 0, &status, 0);
+        return WIFEXITED(status) && WEXITSTATUS(status);
+    }"
+    DBG_GDB_FOUND
+)
+
+if (DBG_GDB_FOUND)
+    add_compile_options(
+        -DWITH_DBG_GDB
+    )
+endif (DBG_GDB_FOUND)
+
+check_cxx_source_compiles("
+    #include <sys/prctl.h>
+    int main() {
+        return prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
+    }"
+    PRCTL_PT_FOUND
+)
+
+if (PRCTL_PT_FOUND)
+    add_compile_options(
+        -DWITH_PRCTL_PT
+    )
+endif (PRCTL_PT_FOUND)
diff --git a/cmake/FindSigaction.cmake b/cmake/FindSigaction.cmake
new file mode 100644
index 0000000000..6b49814ac3
--- /dev/null
+++ b/cmake/FindSigaction.cmake
@@ -0,0 +1,26 @@
+include(CheckCXXSourceCompiles)
+
+check_cxx_source_compiles("
+    #include <signal.h>
+    void *addr;
+    int code;
+    void handler(int sig, siginfo_t *si, void *context) {
+        addr = si->si_addr;
+        code = si->si_code;
+    }
+    int main() {
+        struct sigaction sa;
+        sa.sa_flags = SA_SIGINFO;
+        sigemptyset(&sa.sa_mask);
+        sa.sa_sigaction = handler;
+        sigaction(SIGSEGV, &sa, 0);
+        return 0;
+    }"
+    SIGACTION_FOUND
+)
+
+if (SIGACTION_FOUND)
+    add_compile_options(
+        -DWITH_SIGACTION
+    )
+endif (SIGACTION_FOUND)
diff --git a/cmake/FindSigaltstack.cmake b/cmake/FindSigaltstack.cmake
new file mode 100644
index 0000000000..5ed7106f0f
--- /dev/null
+++ b/cmake/FindSigaltstack.cmake
@@ -0,0 +1,21 @@
+include(CheckCXXSourceCompiles)
+
+check_cxx_source_compiles("
+    #include <signal.h>
+    #include <stdlib.h>
+    int main() {
+        stack_t ss;
+        ss.ss_sp = calloc(SIGSTKSZ, 1);
+        ss.ss_size = SIGSTKSZ;
+        ss.ss_flags = 0;
+        sigaltstack(&ss, nullptr);
+        return 0;
+    }"
+    SIGALTSTACK
+)
+
+if (SIGALTSTACK_FOUND)
+    add_compile_options(
+        -DWITH_SIGALTSTACK
+    )
+endif (SIGALTSTACK_FOUND)