static void _sigio_child(ng_tapnet_t *dev)
{
pid_t parent = _native_pid;
if ((_sigio_child_pid = real_fork()) == -1) {
err(EXIT_FAILURE, "sigio_child: fork");
}
if (_sigio_child_pid > 0) {
/* return in parent process */
return;
}
/* watch tap interface and signal parent process if data is
* available */
fd_set rfds;
while (1) {
FD_ZERO(&rfds);
FD_SET(dev->tap_fd, &rfds);
if (real_select(dev->tap_fd + 1, &rfds, NULL, NULL, NULL) == 1) {
kill(parent, SIGIO);
}
else {
kill(parent, SIGKILL);
err(EXIT_FAILURE, "osx_sigio_child: select");
}
pause();
}
}
static void _continue_reading(netdev2_tap_t *dev)
{
/* work around lost signals */
fd_set rfds;
struct timeval t;
memset(&t, 0, sizeof(t));
FD_ZERO(&rfds);
FD_SET(dev->tap_fd, &rfds);
_native_in_syscall++; /* no switching here */
if (real_select(dev->tap_fd + 1, &rfds, NULL, NULL, &t) == 1) {
int sig = SIGIO;
extern int _sig_pipefd[2];
extern ssize_t (*real_write)(int fd, const void * buf, size_t count);
real_write(_sig_pipefd[1], &sig, sizeof(int));
_native_sigpend++;
DEBUG("netdev2_tap: sigpend++\n");
}
else {
DEBUG("netdev2_tap: native_async_read_continue\n");
native_async_read_continue(dev->tap_fd);
}
_native_in_syscall--;
}
int
select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
{
int retval;
print_trace ("%*sselect(%d, %p, %p, %p, %p)=...\n", indent, "",
n, readfds, writefds, exceptfds, timeout);
indent+=2;
/* call the real select function */
retval = real_select (n, readfds, writefds, exceptfds, timeout);
indent-=2;
print_trace ("%*sselect(%d, %p, %p, %p, %p)=%d\n", indent, "",
n, readfds, writefds, exceptfds, timeout, retval);
return retval;
}
static int _recv(dev_eth_t *dev_eth, char *buf, int len) {
dev_eth_tap_t *dev = (dev_eth_tap_t*)dev_eth;
int nread = real_read(dev->tap_fd, buf, len);
DEBUG("ng_tapnet: read %d bytes\n", nread);
if (nread > 0) {
ng_ethernet_hdr_t *hdr = (ng_ethernet_hdr_t *)buf;
if (!(dev->promiscous) && !_is_addr_multicast(hdr->dst) &&
!_is_addr_broadcast(hdr->dst) &&
(memcmp(hdr->dst, dev->addr, NG_ETHERNET_ADDR_LEN) != 0)) {
DEBUG("ng_eth_dev: received for %02x:%02x:%02x:%02x:%02x:%02x\n"
"That's not me => Dropped\n",
hdr->dst[0], hdr->dst[1], hdr->dst[2],
hdr->dst[3], hdr->dst[4], hdr->dst[5]);
#ifdef __MACH__
kill(_sigio_child_pid, SIGCONT);
#endif
return 0;
}
/* work around lost signals */
fd_set rfds;
struct timeval t;
memset(&t, 0, sizeof(t));
FD_ZERO(&rfds);
FD_SET(dev->tap_fd, &rfds);
_native_in_syscall++; /* no switching here */
if (real_select(dev->tap_fd + 1, &rfds, NULL, NULL, &t) == 1) {
int sig = SIGIO;
extern int _sig_pipefd[2];
extern ssize_t (*real_write)(int fd, const void * buf, size_t count);
real_write(_sig_pipefd[1], &sig, sizeof(int));
_native_sigpend++;
DEBUG("dev_eth_tap: sigpend++\n");
}
else {
#ifdef __MACH__
kill(_sigio_child_pid, SIGCONT);
#endif
}
_native_in_syscall--;
return nread;
}
else if (nread == -1) {
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
}
else {
err(EXIT_FAILURE, "dev_eth_tap: read");
}
}
else if (nread == 0) {
DEBUG("_native_handle_tap_input: ignoring null-event");
}
else {
errx(EXIT_FAILURE, "internal error _rx_event");
}
return -1;
}
