int main (int argc, char ** argv) {
if (argc < 2) {
fprintf(stderr, "%s: expected argument\n", argv[0]);
return 1;
}
printf("(This should fork and the child process (but not the parent) should segfault)\n");
size_t size = 27;
volatile char * shm = (char *)syscall_shm_obtain(argv[1], &size);
if (shm == NULL) {
return 1;
}
int pid = getpid();
uint32_t f = fork();
if (getpid() != pid) {
// Child: client
return main_client(shm);
} else {
// Parent: server
return main_server(shm);
}
return 0;
}
/*
* XXX: take font name as an argument / allow multiple fonts
*/
static void _loadSansSerif() {
char * font;
size_t s = 0;
int error;
font = (char *)syscall_shm_obtain(WINS_SERVER_IDENTIFIER ".fonts.sans-serif", &s);
error = FT_New_Memory_Face(library, font, s, 0, &face);
error = FT_Set_Pixel_Sizes(face, FONT_SIZE, FONT_SIZE);
}
/*
* XXX: take font name as an argument / allow multiple fonts
*/
static void _load_font(int i, char * name) {
char * font;
size_t s = 0;
int error;
char tmp[100];
snprintf(tmp, 100, "sys.%s%s", getenv("DISPLAY"), name);
font = (char *)syscall_shm_obtain(tmp, &s);
error = FT_New_Memory_Face(library, font, s, 0, &faces[i]);
error = FT_Set_Pixel_Sizes(faces[i], FONT_SIZE, FONT_SIZE);
}
static shm_t * shm_connect(uint8_t device_type, char * id, char * unique_id) {
/* RULES: if device is a client and the id is non existant, throw an error*/
/* otherwise, if it exists, connect into the server */
/* else if it's a server and the id doesn't exist, create one*/
/* otherwise, if the id exists and the device is a server, throw an error*/
if(device_type == SHM_DEV_CLIENT && (!hashmap_contains(shm_network, id) || !servers_online)) {
/* Can't connect to that server. It is offline / doesn't exist */
return (shm_t*)SHM_ERR_SERV_NOEXIST;
} else if(device_type == SHM_DEV_SERVER && hashmap_contains(shm_network, id)) {
/* That server is already online. We don't want to have ID conflicts */
return (shm_t*)SHM_ERR_SERV_ALREADYON;
}
/*
* Before we even try to connect as client, we must know if the server we're
* connecting to is also online
*/
if(device_type == SHM_DEV_CLIENT) {
if(get_server_from_network(id)->dev_status == SHM_STAT_OFFLINE) {
/* Oops, the server is offline */
return (shm_t*)SHM_ERR_SERV_OFFLINE;
}
}
/* All seems good. We're continuing the function */
shm_t * shm_new_dev = malloc(sizeof(shm_t));
shm_new_dev->dev_type = device_type; /* Set its type */
shm_new_dev->dev_status = SHM_STAT_ONLINE; /* Set device as online */
strcpy(shm_new_dev->shm_key, id); /* Set its ID so we know what server we're called/what server we're connected to */
strcpy(shm_new_dev->unique_id, unique_id);
shm_new_dev->shm = (char*)syscall_shm_obtain(id, &shman_size);
memset(shm_new_dev->shm, 0, shman_size);
/* Add this device into a hashmap with a list (which indicates the nodes connected to the hash) as value and ID as key */
if(device_type == SHM_DEV_SERVER)
add_server_to_network(shm_new_dev);
else
add_client_to_list(shm_new_dev);
return shm_new_dev;
}
int main(int argc, char ** argv) {
char c;
volatile char *shm;
volatile char *s;
if (argc < 2) {
fprintf(stderr, "%s: expected argument\n", argv[0]);
return 1;
}
char * key = argv[1];
/*
* Attach to the shared memory chunk
*/
size_t size = SHMSZ;
if ((shm = (char *)syscall_shm_obtain(key, &size)) == (char *) NULL) {
return 1;
}
printf("Server: mounted to 0x%x\n", shm);
/*
* Now put some things into the memory for the
* other process to read.
*/
s = shm;
for (c = 'a'; c <= 'z'; c++)
*s++ = c;
*s = '\0';
/*
* Finally, we wait until the other process
* changes the first character of our memory
* to '*', indicating that it has read what
* we put there.
*/
while (*shm != '*') {}
return 0;
}
/*
* shm_network_init - Shared Memory Manager constructor
*/
static void shm_network_init() {
shm_network = hashmap_create(1);
shm_client_list = hashmap_create(1);
shm_cmd = (char*) syscall_shm_obtain(SHM_RESKEY_SHMAN_CMD, &shman_size);
}