int main (int argc, char** argv)
{
int err;
err = pipe(fd);
if(err == -1)
{
return -1;
}
printf("%s\n", "In the main process.\n");
pid_t pid = fork();
if(pid == 0)
{
/* children's code*/
printf("%s\n", "In the children process.\n");
children_code(fd[1]);
}
else if(pid > 0)
{
/* parent's code */
printf("%s\n", "In the parent process\n");
parent_code(fd[0]);
}
else
{
/* error */
return -1;
}
printf("\n");
return 0;
}
main(int ac, char *av[])
{
void child_code(int), parent_code(int);
pid_t pid;
int i,n;
int delay;
/*
* setup
*/
if ( ac == 1 ){
fprintf(stderr,"usage: sol08.8b numberofchildren\n");
exit(1);
}
n = atoi(av[1]);
srand(getpid());
printf("before: mypid is %d\n", getpid());
/*
* main loop
*/
for(i=0; i<n ; i++){
delay = 1 + (rand() % MAXDELAY);
pid = fork();
if ( pid == -1 )
oops("fork", 2);
if ( pid == 0 )
child_code(delay);
}
parent_code(n);
return 0;
}
/* Execute the given command in the array. Supports arguments */
void execute(char *input){
pid_t pid;
char command[BUF_SIZE];
trim(input, command);
if(strcmp("exit", command) == 0){
printf("exiting...\n");
exit(0);
}
else if(strcmp("", command) != 0){
pid = fork();
if(pid < 0){
perror("fork");
exit(-1);
}
else if(pid == 0){ /*child*/
child_code(command);
}
else{ /* parent */
parent_code();
}
}
}
int main(int argc, char const *argv[])
{
/* basically the same key used
for the semaphore programs */
key_t key;
pid_t childPid;
int msqid;
/* create a token */
if((key = ftok("/tmp", SECRET_KEY)) == -1) {
printf("[-] Error on ftok\n");
return 1;
}
/* create a set of msg */
if((msqid = msgget(key, 0666|IPC_CREAT|IPC_EXCL)) == -1) {
printf("[-] Error on msgid\n");
return 1;
}
/* now use the fork */
switch (childPid = fork()){
case -1: //fork fallita
return 1;
break;
case 0: // eseguo il codice del figlio
child_code(msqid);
break;
default: // eseguo il codice del padre
parent_code(msqid);
break;
}
return 0;
}
int main(void) {
int newpid;
printf("Before: my pid is %d\n", getpid());
if ((newpid = fork()) == -1)
perror("fork");
else if (newpid == 0)
child_code(DELAY);
else
parent_code(newpid);
return EXIT_SUCCESS;
}
int main()
{
int newpid;
void child_code(), parent_code();
printf("before: my pid is %d \n", getpid());
if ((newpid = fork()) == -1)
perror("fork");
else if (newpid == 0)
child_code(DELAY);
else
parent_code(newpid);
}
int main(void)
{
int newpid;
void child_code(), parent_code();
printf("before: my pid is %d\n", getpid());
if ((newpid = fork()) == -1) {
perror("fork");
} else if (newpid == 0) {
child_code(DELAY);
} else {
parent_code(newpid);
}
return 0;
}
int main (int argc, char** argv)
{
int i, err;
for(i = 1; i <= 30; i++)
{
if(i != SIGKILL && i != SIGSTOP)
{
err = sigaction(i, &act, NULL);
if(err == -1)
{
printf("Cannot handle signal : %d\n", i);
return -1;
}
}
}
err = pipe(fd);
if(err == -1)
{
return -1;
}
printf("%s\n", "In the main process.\n");
pid_t pid = fork();
if(pid == 0)
{
/* children's code*/
printf("%s\n", "In the children process.\n");
close(fd[0]);
children_code(fd[1]);
}
else if(pid > 0)
{
/* parent's code */
printf("%s\n", "In the parent process\n");
close(fd[1]);
parent_code(fd[0]);
}
else
{
/* error */
return -1;
}
printf("\n");
return 0;
}
int main(int argc, char **argv)
{
int newpid;
int i;
void child_code(int);
void parent_code(int);
if(argc != 2){
printf("Usage: waitdemo_l number_of_fork\n");
exit(0);
}
for(i = 0; i < atoi(argv[1]); i++){
if((newpid = fork()) == -1){
perror("fork");
exit(0);
}else if(newpid == 0)
child_code(DELAY);
else
parent_code(newpid);
}
return 0;
}
