import of olds chapters

chap/debug.tex

@@ -0,0 +1,55 @@
+\chapter{Debug}\index{Debug}
+\label{chap:debug}
+
+Quand plus rien ne marche, il existe encore un espoir...
+
+\section{strace}\index{strace}
+
+
+\section{LD\_PRELOAD}\index{LD\_PRELOAD}
+
+
+\begin{lstlisting}[language=C]
+/*
+spy_getenv.so:  spy_getenv.c Makefile
+        gcc -Wall -shared -fPIC  $< -ldl -o $@
+*/
+
+#include  <stdio.h>
+#include  <string.h>
+#include  <unistd.h>
+
+#define   __USE_GNU
+#include  <dlfcn.h>
+
+typedef char * (*original_getenv)(const char *envname);
+
+char *getenv(char *envname)
+{
+static char		*arrow = "--getenv--> ";
+static char		*wtf = " --> WTF ?";
+
+char			*content;
+original_getenv		orig_getenv;
+
+orig_getenv = (original_getenv)dlsym(RTLD_NEXT, "getenv");
+
+write(STDERR_FILENO, arrow, strlen(arrow));
+write(STDERR_FILENO, envname, strlen(envname));
+
+content = orig_getenv(envname);
+if (NULL != content) {
+	write(STDERR_FILENO, "=", 1);
+	write(STDERR_FILENO, content, strlen(content));
+	}
+else	{
+	write(STDERR_FILENO, wtf, strlen(wtf));
+	}
+
+write(STDERR_FILENO, "\n", 1);
+
+return content;
+}
+\end{lstlisting}
+
+