src

tp/tp4/src/ex1/Makefile

@@ -0,0 +1,23 @@
+
+
+# si on tape "make" sans préciser de cible, make va chercher à
+# construire la *première* cible du Makefile.
+#
+default: all
+
+all: rebours parexec
+
+##########################################
+# compilation des programmes
+
+rebours: rebours.c
+	gcc -g -Wall -Wextra -Werror -o rebours   rebours.c 
+
+parexec: parexec.c
+	gcc -g -Wall -Wextra -Werror -o parexec   parexec.c
+
+##########################################
+# nettoyage des fichiers générés
+
+clean:
+	rm -f *.o parexec rebours

tp/tp4/src/ex1/parexec.c

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+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, char* argv[])
+{
+	// TODO
+	return EXIT_SUCCESS;
+}

tp/tp4/src/ex1/rebours.c

@@ -0,0 +1,19 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[])
+{
+	assert(argc == 2);
+
+	int value = strtol(argv[1], NULL, 0);
+	pid_t p =  getpid();
+	printf("%d: debut\n",p);
+	for(int i = value; i>0; i--){
+		printf("%d: %d\n",p,i);
+		sleep(1);
+	}
+	printf("%d: fin\n",p);
+	return EXIT_SUCCESS;
+}

tp/tp4/src/helpers.c

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+#include "helpers.h"
+#include <signal.h>
+#include <time.h>
+
+int set_signal_handler(int signo, void (*handler)(int)) {
+    struct sigaction sa;
+    sa.sa_handler = handler;    // call `handler` on signal
+    sigemptyset(&sa.sa_mask);   // don't block other signals in handler
+    sa.sa_flags = SA_RESTART;            //  restart system calls
+    return sigaction(signo, &sa, NULL);
+}
+
+double tstamp(void) {                                                                                    
+	struct timespec tv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+
+

tp/tp4/src/helpers.h

@@ -0,0 +1,7 @@
+#ifndef _HELPERS_H
+#define _HELPERS_H
+
+int set_signal_handler(int signo, void (*handler)(int));
+double tstamp(void);
+
+#endif

tp/tp4/src/pi.c

@@ -0,0 +1,31 @@
+#include<unistd.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<signal.h>
+#include<stdint.h>
+#include<assert.h>
+#include "helpers.h"
+
+
+uint64_t shots = 0,
+		 shots_in = 0;
+
+double pi = 0,
+	   t1;
+
+int main(int argc,char * argv[])
+{
+	double x,y;
+	t1 = tstamp();
+
+	alarm(5);
+
+	while(1){
+		x = ((double)rand())/(double)RAND_MAX;
+		y = ((double)rand())/(double)RAND_MAX;
+		shots ++;
+
+		if ((x*x+y*y) <= 1) 
+			shots_in ++;
+	}
+}

tp/tp4/src/ping_pong.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <assert.h>
+
+#define N 10000
+void sig_hand(int sig) {}
+
+sigset_t saveMask, blockMask;
+
+void player_wait(){
+	pause();
+}
+void child_process()
+{
+	int x = 0;
+	while(x < N)
+	{
+		player_wait();
+		printf("\tPong %d!\n", ++x);
+		kill(getppid(), SIGUSR1);
+	}
+	return ;
+}
+
+void parent_process(pid_t pid)
+{
+	int y = 0;
+	while (y < N)
+	{
+		printf("Ping %d!\n", ++y);
+		kill(pid, SIGUSR1);
+		player_wait();
+	}
+	return ;
+}
+
+int main(int argc, char* argv[])
+{
+	//set up signal handler for parent & child
+	struct sigaction sa;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	sa.sa_handler = sig_hand;
+
+	assert (sigaction(SIGUSR1, &sa, NULL) != -1);
+
+	pid_t pid = fork();
+
+	if (pid == 0)
+		child_process();
+	else
+		parent_process(pid);
+	return 0;
+}

tp/tp4/src/section_critique.c

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+#include<unistd.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<signal.h>
+#include<stdint.h>
+#include<assert.h>
+#include "helpers.h"
+
+
+int x=2,y=3;
+
+int swap(int *x,int *y)
+{
+	int tmp=*x;
+	*x=*y;
+	*y=tmp;
+}
+
+void sig_handler(int signo)
+{
+	switch(signo){
+		case SIGQUIT : 
+			printf("x=%d y=%d\n",x,y);
+			break;
+	}
+}
+
+int main(int argc,char * argv[])
+{
+	assert(set_signal_handler(SIGQUIT,sig_handler)==0);
+	while(1){
+		swap(&x,&y);
+	}
+}