Add System::executable_path()

src/core/System.cc

@@ -3,13 +3,15 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <stdint.h>
+#include <fcntl.h>
 
 unsigned long System::page_size;
 unsigned int System::page_size_log;
 unsigned long System::page_base_mask;
 unsigned long System::page_offset_mask;
+static std::string Executable_Path;
 
-bool System::init()
+bool System::init(char * argv[])
 {
     long sc_page_size = sysconf(_SC_PAGESIZE);
     if (sc_page_size < 0)
@@ -41,6 +43,21 @@ bool System::init()
         return false;
     }
 
+#if defined(PLATFORM_LINUX)
+    char link_buffer[1000];
+    ssize_t len = readlink("/proc/self/exe", link_buffer, sizeof(link_buffer));
+    if ((len > 0) && (len < (ssize_t)sizeof(link_buffer)))
+    {
+        Executable_Path = std::string(link_buffer, len);
+    }
+    else
+    {
+        return false;
+    }
+#elif defined(PLATFORM_WINDOWS)
+    Executable_Path = argv[0];
+#endif
+
     return true;
 }
 
@@ -59,3 +76,8 @@ void System::free_pages(void * addr, int num)
 {
     (void)munmap(addr, num << System::page_size_log);
 }
+
+std::string System::executable_path()
+{
+    return Executable_Path;
+}

src/core/System.h

@@ -1,12 +1,15 @@
 #ifndef SYSTEM_H
 #define SYSTEM_H
 
+#include <string>
+
 class System
 {
 public:
-    static bool init();
+    static bool init(char * argv[]);
     static void * alloc_pages(int num);
     static void free_pages(void * addr, int num);
+    static std::string executable_path();
 
     static unsigned long page_size;
     static unsigned int page_size_log;

src/jes.cc

@@ -6,7 +6,7 @@
 
 int main(int argc, char * argv[])
 {
-    if (!System::init())
+    if (!System::init(argv))
     {
         return 1;
     }

test/src/main.cc

@@ -6,7 +6,7 @@
 int main(int argc, char * argv[])
 {
     ::testing::InitGoogleTest(&argc, argv);
-    System::init();
+    System::init(argv);
     mkdir("test/tmp", 0777);
     return RUN_ALL_TESTS();
 }