cm processus

tp/tp3/src/copy1byte.c

@@ -0,0 +1,45 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include<stdio.h>
+#include <stdlib.h>
+#include<assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define msg1 "je suis le pere"
+#define msg2 "je suis le fils !!!"
+
+int main(int argc,char * argv[]){
+
+	int infd,outfd;
+	ssize_t nbread;
+	char buf[1];
+	pid_t p;
+
+	if (argc != 3){
+
+		printf("%s infile outfile\n",argv[0]);
+		exit(1);
+	}
+
+	infd = open(argv[1],O_RDONLY);
+	assert(infd >= 0);
+	outfd = open(argv[2],O_WRONLY|O_CREAT|O_TRUNC,0644);
+	assert(outfd >= 0);
+
+	//p=fork(); // <- decommentez cette ligne
+
+	while(1){
+	
+	nbread=read(infd,buf,sizeof(buf));
+	if (nbread <=0 ) break;
+	write(outfd,buf,sizeof(buf));
+
+	}
+
+
+	close(infd);
+	close(outfd);
+}

tp/tp3/src/copy_on_write.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#define N 8*1024*1024 
+
+char tab[N];
+
+int main(void)
+{
+	for (int i = 0; i < N; i++)
+		tab[i] = (char)i;
+
+	printf("Avant fork : tab = %p\n", (void *)tab);
+
+	pid_t pid = fork();
+
+	if (pid < 0) {
+		perror("fork");
+		exit(EXIT_FAILURE);
+	}
+
+	if (pid == 0) {
+		printf("Fils : tab = %p, tab[5000] = %d\n",
+				(void *)(tab+5000), tab[5000]);
+		printf("FILS PID = %d\n", getpid());
+		getchar();
+
+		tab[5000] = 42;
+		printf("-> modification\n");
+		getchar();
+
+		printf("Fils après modification : tab[5000] = %d\n",
+				tab[5000]);
+
+		exit(EXIT_SUCCESS);
+	}
+	else {
+		sleep(1);
+
+		printf("Père : tab = %p, tab[5000] = %d\n",
+				(void *)tab, tab[5000]);
+
+		wait(NULL);
+	}
+
+	return 0;
+}

tp/tp3/src/ex1-stdio.c

@@ -0,0 +1,12 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+
+int main(){
+
+	printf("NON");
+	if (fork()) {
+		printf("OUI\n");
+	}
+}

tp/tp3/src/ex1-syscall.c

@@ -0,0 +1,14 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+
+int main(){
+
+	//printf("NON");
+	write(STDOUT_FILENO,"NON",3);
+	if (fork()) {
+		//printf("OUI\n");
+	write(STDOUT_FILENO,"OUI\n",4);
+	}
+}

tp/tp3/src/exo4.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <sys/wait.h>
+int main(int argc, char *argv[])
+{
+	pid_t p;
+	int status;
+	p = fork();
+	assert( p >= 0);
+
+	if ( p == 0){
+		printf("@retour de fork = %d pid = %d ppid = %d\n",p,getpid(),getppid());
+		sleep(4);
+		exit(2);
+	}
+
+	printf("@retour de fork = %d pid = %d ppid = %d\n",p,getpid(),getppid());
+
+	assert( wait(&status) >= 0);
+
+	if (WIFEXITED(status))
+	printf("code retour fils = %d\n",WEXITSTATUS(status));
+
+	execlp("ls","totototo","-l","/",NULL);
+	
+	/* code ici */
+	assert(0);
+
+	return 0;
+}

tp/tp3/src/fork_and_fd1.c

@@ -0,0 +1,43 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include<stdio.h>
+#include <stdlib.h>
+#include<assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define msg1 "je suis le pere"
+#define msg2 "je suis le fils !!!"
+
+int main(int argc,char * argv[]){
+
+	int outfd;
+	pid_t p;
+
+	if (argc != 2){
+
+		printf("%s file\n",argv[0]);
+		exit(1);
+	}
+
+	//p=fork();
+	outfd = open(argv[1],O_WRONLY|O_CREAT,0644);
+	assert(outfd >= 0);
+	p=fork();
+	switch(p){
+		case (pid_t)-1 : 
+			perror(NULL);
+			exit(2);
+
+		case (pid_t)0 :
+			write(outfd,msg2,strlen(msg2));
+			break;
+		default : 
+			write (outfd,msg1,strlen(msg1));
+			break;
+	}
+	getchar();
+	close(outfd);
+}

tp/tp3/src/fork_and_fd2.c

@@ -0,0 +1,43 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include<stdio.h>
+#include <stdlib.h>
+#include<assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define msg1 "je suis le pere"
+#define msg2 "je suis le fils !!!"
+
+int main(int argc,char * argv[]){
+
+	int outfd;
+	pid_t p;
+
+	if (argc != 2){
+
+		printf("%s file\n",argv[0]);
+		exit(1);
+	}
+
+	p=fork();
+	outfd = open(argv[1],O_WRONLY|O_CREAT,0644);
+	assert(outfd >= 0);
+	//p=fork();
+	switch(p){
+		case (pid_t)-1 : 
+			perror(NULL);
+			exit(2);
+
+		case (pid_t)0 :
+			write(outfd,msg2,strlen(msg2));
+			break;
+		default : 
+			write (outfd,msg1,strlen(msg1));
+			break;
+	}
+	getchar();
+	close(outfd);
+}

tp/tp3/src/session.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <unistd.h>
+
+
+
+int main(int argc, char *argv[])
+{
+	if (fork()){
+		printf("session = %d\n",getsid(getpid()));
+		while(1);
+	} else {
+		setsid();
+		printf("session = %d\n",getsid(getpid()));
+		while(1);
+	}
+	return 0;
+}
+