int main(int argc, char *argv[]) {
pthread_t recv;
int res;
char str_buf[4096]; // temporary string buffer
srand(time(NULL)); // initialize random seed
char rnd_char = 97 + (int) (26.0 * rand() / (RAND_MAX + 1.0)); // generate random char (ASCII: a..z)
// Allocate access protected page memory
if (posix_memalign((void**) &page_mem, page_size, (page_num * page_size))
!= 0) {
fprintf(0, "Error allocating page memory\n");
return 1;
}
mprotect(page_mem, (page_num * page_size), PROT_NONE);
// Create socket as recv thread)
fd = setup_socket(CLIENT);
res = pthread_create(&recv, NULL, client_recv, (void *) (size_t) fd);
if (res != 0) {
perror("pthread_create() failed");
close(fd);
}
if (register_segfault_handler(page_mem) != 0) {
printf("Cannot register SEGV handler\n");
return -1;
}
// Random client operations
while (1) {
client_operations_t operation = (3.0 * rand() / (RAND_MAX + 1.0)); // select random operation (READ, WRITE, SYNC)
int delay = 100 + (int) (200.0 * rand() / (RAND_MAX + 1.0)); // random delay regarding endless loop (100..300ms)
size_t page_offset = 0; // initialize random page offset
//page_offset = ((3.0 * rand() / (RAND_MAX + 1.0)) * page_size); // select random shared memory page (used in 'client_a2c' executable only)
void *addr = page_mem + page_offset;
printf("addr = %p, delay = %d, operation = %x \n",addr, delay,operation);
switch (operation) {
case READ: // Read string from first/random memory page
strncpy(str_buf, addr, STR_LEN);
printf("[Own char: '%c']: Page content (addr: %p) '%s'\n", rnd_char,
addr, str_buf);
break;
case WRITE: // Fill first/random memory page with own random char
memset(addr, rnd_char, page_size);
break;
case SYNC: // Send all modified pages back to server (server releases write locks)
printf("sync\n");
sync();
break;
}
usleep(delay * 10000); //sleep of 'delay' ms
}
return 0;
}
int main(int argc, char **argv){
register_segfault_handler();
command_loop();
return 0;
}
