add program name resolution

src/rvprof_utils.c

@@ -0,0 +1,46 @@
+#include "rvprof_internal.h"
+
+char* rvprof_utils_get_program_name(void){
+    static char resolved_name[256];
+    char link_path[32];
+    ssize_t len;
+
+    // option 1: try /proc/self/exe (Linux only)
+    snprintf(link_path, sizeof(link_path), "/proc/self/exe");
+    len = readlink(link_path, resolved_name, sizeof(resolved_name) - 1);
+    if (len > 0) {
+        resolved_name[len] = '\0';
+        // Extract just the filename from full path
+        char* basename = strrchr(resolved_name, '/');
+        if (basename) {
+            return basename + 1; // Skip the '/'
+        }
+        return resolved_name;
+    }
+    
+    // option 2: try /proc/self/cmdline (fallback)
+    FILE* cmdline = fopen("/proc/self/cmdline", "r");
+    if (cmdline) {
+        if (fgets(resolved_name, sizeof(resolved_name), cmdline)) {
+            fclose(cmdline);
+            char* basename = strrchr(resolved_name, '/');
+            if (basename) {
+                return basename + 1;
+            }
+            return resolved_name;
+        }
+        fclose(cmdline);
+    }
+    
+    // option 3: use provided program name if available
+    if (g_rvprof.config.program_name) {
+        char* basename = strrchr(g_rvprof.config.program_name, '/');
+        if (basename) {
+            return basename + 1;
+        }
+        return g_rvprof.config.program_name;
+    }
+    
+    // option 4: fallback
+    return "unknown_program";
+}