un petit push, parfois

code/debug/spy_getenv.c

@@ -0,0 +1,45 @@
+/*
+ *
+ *  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 = " --> (nil)";
+
+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;
+}
+
+/* j'adore quand un plan se déroule sans accrc */
+