int main(void) {
int tmp = 1026;
int* p;
for (tmp = 1026; tmp < 1027; tmp++) {
p = (int *) palloc();
*p = 0;
share_page(p);
}
int pid = fork();
if(pid == 0){
*p += 3;
}else{
*p += 32;
}
exit();
return 0;
}
int main(int argc, char *argv[])
{
pid_t pid;
int fd;
int writer2encrypt[2];
int encrypt2reader[2];
int reader2writer[2];
char *buf_writer, *buf_reader;
int *r;
if (argc < 2) {
write(STDOUT_FILENO, ERR_ARGC, sizeof(ERR_ARGC) - 1);
_exit(-1);
}
/* create 2 pipes */
if (pipe(encrypt2reader) < 0 || pipe(writer2encrypt) < 0 || pipe(reader2writer) < 0) {
write(STDOUT_FILENO, ERR_PIPE, sizeof(ERR_PIPE) - 1);
return -1;
}
buf_reader = (char *) palloc();
buf_writer = (char *) palloc();
r = (int *) palloc();
share_page((void *) buf_reader);
share_page((void *) buf_writer);
share_page((void *) r);
pid = fork();
if (pid < (pid_t) 0) {
write(STDOUT_FILENO, ERR_FORK1, sizeof(ERR_FORK1) - 1);
return -1;
} else if (pid == (pid_t) 0) {
close(writer2encrypt[0]);
close(writer2encrypt[1]);
close(encrypt2reader[1]);
close(reader2writer[0]);
if (argc > 2) {
if ( (fd = open(argv[2], O_CREAT | O_RDWR, 0)) < 0) {
write(STDOUT_FILENO, ERR_OPEN, sizeof(ERR_OPEN) - 1);
return -1;
}
} else {
fd = STDOUT_FILENO;
}
/* READER process */
return reader(fd, encrypt2reader[0], reader2writer[1], buf_reader, r+1);
} else {
pid = fork();
if (pid < (pid_t) 0) {
write(STDOUT_FILENO, ERR_FORK2, sizeof(ERR_FORK2) - 1);
return -1;
} else if (pid == (pid_t) 0) {
close(encrypt2reader[0]);
close(writer2encrypt[1]);
/* ENCRYPT process */
return encrypt(writer2encrypt[0], buf_writer, r,
encrypt2reader[1], buf_reader, r+1);
} else {
close(encrypt2reader[0]);
close(encrypt2reader[1]);
close(writer2encrypt[0]);
close(reader2writer[1]);
/* open the file to encrypt */
if ( (fd = open(argv[1], O_RDONLY, 0)) < 0) {
write(STDOUT_FILENO, ERR_OPEN, sizeof(ERR_OPEN) - 1);
return -1;
}
/* WRITER process */
return writer(fd, writer2encrypt[1], reader2writer[0], buf_writer, r);
}
}
return 0;
}
