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+title:Linux antidebug 1
+keywords:linux,debug,antidebug
+
+# Linux antidebug 1
+
+
+
+Content: When ptrace is used for programm debugin then only
+one ptrace can be attached to programmwhen we trying run ptrace
+with PTRACE_TRACEME then we get  -1. I tested with gdb,ald.
+Also this method should work with IDApro
+
+```c
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/ptrace.h>
+ 
+long int ptraced()
+{
+    return (ptrace(PTRACE_TRACEME, 0, 0, 0) == -1);
+}
+ 
+int main()
+{
+    if ( ptraced() )
+    {
+        printf("Ptraced!\n");
+    }
+    return 0;
+}
+```
+
+## Downloads 
+http://archive.main.lv/files/writeup/linux_antidebug_1/antidebug1.tar.gz
+