[TIP] Non Blocking C Read
May 11, 2009 Matteo Bertozzi | Filed Under Tips | No CommentsThis is Just a simple code that maybe all the Linux C Developer knows, but if someone is still learning, This is a function that wrap the standard read function adding the non blocking feature. It’s Really useful in relation with Sockets.
int nonblock_read (int fd, char *buffer, size_t bufsize, int timeout) {
if (timeout > 0) {
struct timeval tv;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = timeout * 1000;
if (select(1, &rfds, NULL, NULL, &tv) <= 0)
return(-ETIME);
}
return(read(fd, buffer, bufsize));
}