Signed-off-by: Rafał Miłecki <zaj...@gmail.com>
---
V2: Use poll instead of select
---
usock.c | 27 +++++++++++++++++++++++++++
usock.h | 11 +++++++++++
2 files changed, 38 insertions(+)
diff --git a/usock.c b/usock.c
index 04ed4ee..5bdd3ff 100644
--- a/usock.c
+++ b/usock.c
@@ -20,6 +20,7 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
+#include <poll.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
@@ -117,3 +118,29 @@ 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) {
+ struct pollfd fds[1];
+ int res;
+
+ fds[0].fd = fd;
+ fds[0].events = POLLOUT;
+
+ res = poll(fds, 1, msecs);
+ 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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