struct thread *thread_create(unsigned int flags, void *(*run)(void *), void *arg) {
struct thread *t;
int priority;
/* check mutually exclusive flags */
if ((flags & THREAD_FLAG_PRIORITY_LOWER)
&& (flags & THREAD_FLAG_PRIORITY_HIGHER)) {
return err_ptr(EINVAL);
}
if((flags & THREAD_FLAG_NOTASK) && !(flags & THREAD_FLAG_SUSPENDED)) {
return err_ptr(EINVAL);
}
/* check correct executive function */
if (!run) {
return err_ptr(EINVAL);
}
/* calculate current thread priority. It can be change later with
* thread_set_priority () function
*/
priority = thread_priority_by_flags(flags);
/* below we will work with thread's instances and therefore we need to
* lock scheduler (disable scheduling) to our structures is not be
* corrupted
*/
sched_lock();
{
/* allocate memory */
if (!(t = thread_alloc())) {
t = err_ptr(ENOMEM);
goto out_unlock;
}
/* initialize internal thread structure */
thread_init(t, priority, run, arg);
/* link with task if needed */
if (!(flags & THREAD_FLAG_NOTASK)) {
task_thread_register(task_self(), t);
}
thread_cancel_init(t);
if (!(flags & THREAD_FLAG_SUSPENDED)) {
thread_launch(t);
}
if (flags & THREAD_FLAG_DETACHED) {
thread_detach(t);
}
}
out_unlock:
sched_unlock();
return t;
}
uint8_t *bootp_get_opt(struct bootphdr *bph, uint8_t opt_type) {
int ret;
uint8_t *tag;
uint8_t *tag_len;
ret = bootp_valid(bph, BOOTPREPLY);
if (ret != 0) {
return err_ptr(-ret);
}
tag = &bph->vend[sizeof(dhcp_magic_cookie)];
while (tag < &bph->vend[sizeof(bph->vend)]) {
switch(*tag) {
default:
if (*tag == opt_type) {
return tag + 2;
}
tag++;
tag_len = tag;
tag += (*tag_len + 1);
break;
case TAG_PAD:
tag++;
break;
case TAG_END:
return NULL;
}
}
return NULL;
}
/*
* file_operation
*/
static struct idesc *ext3fs_open(struct node *node, struct file_desc *desc, int flags) {
struct fs_driver *drv;
if(NULL == (drv = fs_driver_find_drv(EXT2_NAME))) {
return err_ptr(EINVAL);
}
return drv->file_op->open(node, desc, flags);
}
static struct idesc *uart_fsop_open(struct node *node, struct file_desc *file_desc, int flags) {
struct uart *uart;
struct idesc *idesc;
int res;
uart = uart_dev_lookup(node->name);
if (!uart) {
return err_ptr(ENOENT);
}
idesc = idesc_serial_create(uart, flags);
if (err(idesc)) {
return idesc;
}
res = uart_open(uart);
if (res) {
return err_ptr(-res);
}
return idesc;
}
static struct idesc *uart_fsop_open(struct inode *node, struct idesc *desc) {
struct device_module *cdev;
struct idesc *idesc;
int res;
cdev = node->i_data;
idesc = idesc_serial_create(cdev->dev_data, 0);
if (err(idesc)) {
return idesc;
}
res = uart_open(cdev->dev_data);
if (res) {
return err_ptr(-res);
}
return idesc;
}
struct sock *sock_create(int family, int type, int protocol) {
int ret;
struct sock *new_sk;
const struct net_family *nfamily;
const struct net_family_type *nftype;
const struct net_sock *nsock;
nfamily = net_family_lookup(family);
if (nfamily == NULL) {
return err_ptr(EAFNOSUPPORT);
}
nftype = net_family_type_lookup(nfamily, type);
if (nftype == NULL) {
return err_ptr(EPROTOTYPE);
}
nsock = net_sock_lookup(family, type, protocol);
if (nsock == NULL) {
return err_ptr(EPROTONOSUPPORT);
}
new_sk = sock_alloc(nftype->ops, nsock->ops);
if (new_sk == NULL) {
return err_ptr(ENOMEM);
}
sock_init(new_sk, family, type, nsock->protocol,
nftype->ops, nsock->ops,
nfamily->out_ops != NULL ? *nfamily->out_ops : NULL);
assert(new_sk->f_ops != NULL);
ret = new_sk->f_ops->init(new_sk);
if (ret != 0) {
sock_release(new_sk);
return err_ptr(-ret);
}
assert(new_sk->p_ops != NULL);
if (new_sk->p_ops->init != NULL) {
ret = new_sk->p_ops->init(new_sk);
if (ret != 0) {
sock_close(new_sk);
return err_ptr(-ret);
}
}
sock_hash(new_sk);
return new_sk;
}
char *dns_set_nameserver(char *nameserver) {
FILE *file;
char buf[0x40];
char *res;
file = fopen(RESOLV_FILE, "rw");
if (file == NULL) {
return err_ptr(errno);
}
while(NULL != (res = fgets(buf, sizeof(buf), file))) {
if (0 == strncmp(buf, "nameserver ", 11)) {
int i;
int len;
/* remove line */
len = strlen(buf);
for(i = 0; i < len; i ++) {
fwrite("\b", 1, 1, file);
}
fwrite(buf, 1, strlen(buf), file);
strncpy(nameserver_ip, nameserver, sizeof(nameserver_ip)-1);
nameserver_ip[sizeof(nameserver_ip) - 1] = '\0';
fclose(file);
return nameserver_ip;
}
}
sprintf(buf, "nameserver %s\n", nameserver);
fwrite(buf, 1, strlen(buf), file);
strncpy(nameserver_ip, nameserver, sizeof(nameserver_ip)-1);
nameserver_ip[sizeof(nameserver_ip) - 1] = '\0';
fclose(file);
return nameserver_ip;
}
static struct idesc *tun_dev_open(struct node *node, struct file_desc *file_desc, int flags) {
struct net_device *netdev;
struct tun *tun;
netdev = tun_netdev_by_node(node);
if (!netdev) {
return err_ptr(ENOENT);
}
tun = netdev_priv(netdev, struct tun);
tun_user_lock(tun);
waitq_init(&tun->wq);
tun_krnl_lock(tun);
{
skb_queue_init(&tun->rx_q);
}
tun_krnl_unlock(tun);
file_desc->file_info = netdev;
return &file_desc->idesc;
}