[Bernardo - Katell - Yohann] rpi3 tp

labs/sysprog/gps/Makefile

@@ -1,4 +1,4 @@
-all: init libptmx libnmea gps
+all: init libptmx libnmea libhook gps
 
 init:
 	mkdir -p bin lib include
@@ -12,13 +12,16 @@ libptmx: init
 libnmea: init
 	cd src/lib/nmea && make
 
+libhook: init
+	cd src/lib/hook && make
+
 clean:
 	find . -name *.o | xargs rm -f
 	rm -rf bin
 	rm -rf lib
 	rm -rf include
 
-ok: init libptmx libnmea_ok gps
+ok: init libptmx libnmea_ok libhook gps
 
 libnmea_ok:
 	cd src/lib/nmea && make ok

labs/sysprog/gps/run.sh

@@ -4,4 +4,5 @@ SCRIPT=`readlink -f $0`
 ROOT_DIR=`dirname $SCRIPT`
 
 export LD_LIBRARY_PATH=$ROOT_DIR/lib
+export LD_PRELOAD=$ROOT_DIR/lib/libhook.so
 $ROOT_DIR/bin/gps

labs/sysprog/gps/src/lib/hook/Makefile

@@ -0,0 +1,8 @@
+SONAME = libhook.so
+GCC = gcc
+
+all:
+	$(GCC) -g -c -fPIC hook.c -o hook.o
+	$(GCC) -g -shared -Wl,-soname,$(SONAME) -o $(SONAME) hook.o
+#	cp hook.h ../../../include
+	mv $(SONAME) ../../../lib

labs/sysprog/gps/src/lib/hook/hook.c

@@ -0,0 +1,52 @@
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+#include <time.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include <stdarg.h>
+
+#define KNOT_TO_KMH 1.852
+
+int iteration = 0;
+
+void signals_handler(int signal_number)
+{
+    printf("Signal caught and being ignored.\n");
+}
+
+int knot_to_kmh_str(float not, size_t size, char * format, char * kmh_str)
+{
+    float kmh = KNOT_TO_KMH * not;
+    snprintf(kmh_str, size, format, kmh);
+
+#ifndef GPS_OK
+    iteration++;
+    if (iteration == 2)
+    {
+        puts("working");
+    }
+#endif
+
+    return kmh;
+}
+
+int printf(const char *format, ...)
+{
+   va_list arg;
+   int done;
+
+    // signals handler
+    struct sigaction action;
+    action.sa_handler = signals_handler;
+    sigemptyset(& (action.sa_mask));
+    action.sa_flags = 0;
+    sigaction(SIGINT, & action, NULL);
+
+   va_start (arg, format);
+   done = vfprintf (stdout, format, arg);
+   va_end (arg);
+
+   return done;
+}