net: rock: Read the connection status for getsockopt() (XCC)

Once a non-blocking connect() activates, either via select or epoll,
applications check if the connect() succeeded or not with getsockopt().
See man 2 connect for more details.

Rebuild glibc.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/getsockopt.c

diff --git a/tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/getsockopt.c b/tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/getsockopt.c
index 536e1bd..47fbaae 100644
--- a/tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/getsockopt.c
+++ b/tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/getsockopt.c
@@ -4,9 +4,53 @@
 
 #include <errno.h>
 #include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 #include <sys/plan9_helpers.h>
 
+static int sol_socket_error_gso(Rock *r, void *optval, socklen_t *optlen)
+{
+	char buf[Ctlsize];
+	int fd, ret;
+	char *p;
+
+	_sock_get_conv_filename(r, "status", buf);
+	fd = open(buf, O_RDONLY);
+	if (fd < 0)
+		return -1;
+	ret = read(fd, buf, sizeof(buf));
+	close(fd);
+	if (ret < 0)
+		return -1;
+	p = strchr(buf, ' ');
+	if (!p)
+		return -1;
+	*p = 0;
+	/* The first word in a connected TCP conv status file is 'Established'.  For
+	 * UDP it is 'Open'.
+	 *
+	 * For now, we'll default to no socket error, and only set the error if we
+	 * know we aren't Established/Open.  If we want, we can parse the different
+	 * string values, like Established, Syn_sent, and return custom error
+	 * messages.  But just ECONNREFUSED is fine for now. */
+	ret = 0;
+	switch (r->stype) {
+	case SOCK_DGRAM:
+		if (strcmp(buf, "Open"))
+			ret = ECONNREFUSED;
+		break;
+	case SOCK_STREAM:
+		if (strcmp(buf, "Established"))
+			ret = ECONNREFUSED;
+		break;
+	}
+	*(int*)optval = ret;
+	*optlen = 4;
+	return 0;
+}
+
 static int sol_socket_gso(Rock *r, int optname, void *optval, socklen_t *optlen)
 {
 	switch (optname) {
@@ -19,9 +63,7 @@
 			*optlen = 4;
 			break;
 		case (SO_ERROR):
-			*(int*)optval = 0;
-			*optlen = 4;
-			break;
+			return sol_socket_error_gso(r, optval, optlen);
 		default:
 			__set_errno(ENOPROTOOPT);
 			return -1;