Signed-off-by: Rafał Miłecki <zaj...@gmail.com>
---
usock.c | 30 ++++++++++++++++++++++++++++++
usock.h | 11 +++++++++++
2 files changed, 41 insertions(+)
diff --git a/usock.c b/usock.c
index 04ed4ee..39909c1 100644
--- a/usock.c
+++ b/usock.c
@@ -117,3 +117,33 @@ int usock(int type, const char *host, const char *service)
{
usock_set_flags(sock, type);
return sock;
}
+
+int usock_wait_ready(int fd, int msecs) {
+ fd_set fds;
+ struct timeval tv;
+ int res;
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+ tv.tv_sec = msecs / 1000;
+ tv.tv_usec = (msecs % 1000) * 1000;
+
+ res = select(fd + 1, NULL, &fds, NULL, &tv);
+ if (res < 0) {
+ return errno;
+ } else if (res == 0) {
+ return -ETIMEDOUT;
+ } else {
+ int err = 0;
+ socklen_t optlen = sizeof(err);
+
+ res = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &optlen);
+ if (res)
+ return errno;
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
diff --git a/usock.h b/usock.h
index 8f30add..c97fc40 100644
--- a/usock.h
+++ b/usock.h
@@ -32,4 +32,15 @@
int usock(int type, const char *host, const char *service);
+/**
+ * Wait for a socket to become ready.
+ *
+ * This may be useful for users of USOCK_NONBLOCK to wait (with a timeout)
+ * for a socket.
+ *
+ * @param fd file descriptor of socket
+ * @param msecs timeout in microseconds
+ */
+int usock_wait_ready(int fd, int msecs);
+
#endif /* USOCK_H_ */
--
1.8.4.5
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