atmos/wifi-curse
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improve iw_set_channel

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This commit is contained in:
oblique 2012-03-02 06:54:23 +02:00
parent b0b6971d8b
commit 54d4e1d66f
1 changed files with 5 additions and 16 deletions
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21
wificurse.c
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@ -178,19 +178,12 @@ ssize_t iw_read(int fd, void *buf, size_t count, uint8_t **pkt, size_t *pkt_sz)
int iw_set_channel(struct dev *dev, int chan) {
struct iwreq iwr;
int rcvbuflen, old_rcvbuflen;
socklen_t optlen;
ssize_t ret;
/* save current receive buffer size */
optlen = sizeof(old_rcvbuflen);
if (getsockopt(dev->fd, SOL_SOCKET, SO_RCVBUF, &old_rcvbuflen, &optlen) < 0)
return_error("getsockopt(SO_RCVBUF)");
/* set receive buffer size to 0 */
/* this will discard packets that are in kernel packet queue */
rcvbuflen = 0;
if (setsockopt(dev->fd, SOL_SOCKET, SO_RCVBUF, &rcvbuflen, optlen) < 0)
return_error("setsockopt(SO_RCVBUF)");
/* discard packets that are in kernel packet queue */
ret = 0;
while (ret != -1)
ret = recv(dev->fd, NULL, 0, MSG_DONTWAIT);
/* set channel */
memset(&iwr, 0, sizeof(iwr));
@ -201,10 +194,6 @@ int iw_set_channel(struct dev *dev, int chan) {
return_error("ioctl(SIOCSIWFREQ)");
dev->chan = chan;
/* restore receive buffer size */
if (setsockopt(dev->fd, SOL_SOCKET, SO_RCVBUF, &old_rcvbuflen, optlen) < 0)
return_error("setsockopt(SO_RCVBUF)");
return 0;
}