Experimental support for using the client on macOS (Darwin) (#1321)

* shorter SHM names on macOS
* fix segfault on macOS when string is empty
* apple version of read exe path
* ifdef for linux specific API
* fixed test for shm and udp socket
* updated release notes

slsDetectorSoftware/src/CmdParser.cpp

@@ -27,6 +27,10 @@ void CmdParser::Parse(std::string s) {
     // taking s by value we can modify it.
     Reset();
 
+    // If the string is empty there is nothing to parse
+    if (s.empty())
+        return;
+
     // Are we looking at -h --help? avoid removing h from command starting
     // with h when combined with detector id (ex, 1-hostname)
     bool h = replace_first(&s, "--help", " ");

slsDetectorSoftware/src/Module.cpp

@@ -1202,7 +1202,7 @@ void Module::setDestinationUDPIP(const IpAddr ip) {
     }
     sendToDetector(F_SET_DEST_UDP_IP, ip, nullptr);
     if (shm()->useReceiverFlag) {
-        MacAddr retval(0LU);
+        MacAddr retval;
         sendToReceiver(F_SET_RECEIVER_UDP_IP, ip, retval);
         LOG(logINFO) << "Setting destination udp mac of Module " << moduleIndex
                      << " to " << retval;
@@ -1225,7 +1225,7 @@ void Module::setDestinationUDPIP2(const IpAddr ip) {
     }
     sendToDetector(F_SET_DEST_UDP_IP2, ip, nullptr);
     if (shm()->useReceiverFlag) {
-        MacAddr retval(0LU);
+        MacAddr retval;
         sendToReceiver(F_SET_RECEIVER_UDP_IP2, ip, retval);
         LOG(logINFO) << "Setting destination udp mac2 of Module " << moduleIndex
                      << " to " << retval;

slsDetectorSoftware/src/SharedMemory.h

@@ -25,15 +25,27 @@
 #include <sys/stat.h> // fstat
 #include <unistd.h>
 
-namespace sls {
-
-struct CtbConfig;
-// struct sharedDetector;
+// ********************** Defines for shared memory. **********************
+// WARNING! before chaning these search the codebase for their usage!
 
 #define SHM_IS_VALID_CHECK_VERSION 0x250820
+
+//Max shared memory name length in macOS is 31 characters
+#ifdef __APPLE__
+#define SHM_DETECTOR_PREFIX        "/sls_"
+#define SHM_MODULE_PREFIX          "_mod_"
+#else
 #define SHM_DETECTOR_PREFIX        "/slsDetectorPackage_detector_"
 #define SHM_MODULE_PREFIX          "_module_"
+#endif
+
 #define SHM_ENV_NAME               "SLSDETNAME"
+// ************************************************************************
+
+namespace sls {
+
+class CtbConfig;
+
 
 template <typename T, typename U> constexpr bool is_type() {
     return std::is_same_v<std::decay_t<U>, T>;
@@ -267,6 +279,11 @@ template <typename T> class SharedMemory {
             throw SharedMemoryError(msg);
         }
 
+        #ifdef __APPLE__
+        // On macOS, fstat returns the allocated size and not the requested size.
+        // This means we can't check for size since we always get for example 16384 bytes.
+        return;
+        #endif
         auto actual_size = static_cast<size_t>(sb.st_size);
         auto expected_size = sizeof(T);
         if (actual_size != expected_size) {