1 files changed, 40 insertions, 0 deletions
diff --git a/recvfd.c b/recvfd.c
new file mode 100644
index 0000000..34919d4
--- /dev/null
+++ b/recvfd.c
@@ -0,0 +1,40 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+
+
+int
+libsimple_recvfd(int sock)
+{
+	int fd;
+	char buf[1];
+	struct iovec iov;
+	struct msghdr msg;
+	struct cmsghdr *cmsg;
+	char cms[CMSG_SPACE(sizeof(fd))];
+
+	iov.iov_base = buf;
+	iov.iov_len = 1;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	msg.msg_control = (caddr_t)cms;
+	msg.msg_controllen = sizeof(cms);
+
+	switch (recvmsg(sock, &msg, 0)) {
+	case -1:
+		return -1;
+	case 0:
+		errno = ECONNRESET;
+		return -1;
+	default:
+		break;
+	}
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
+	return fd;
+}