ccan: update so ccan/io doesn't exit when we get signals.

In particular, we're going to capture SIGUSR1.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

ccan/README

@@ -1,3 +1,3 @@
 CCAN imported from http://ccodearchive.net.
 
-CCAN version: init-2398-g7082f7d0
+CCAN version: init-2401-ge2d15a2b

ccan/ccan/io/poll.c

@@ -280,8 +280,13 @@ void *io_loop(struct timers *timers, struct timer **expired)
 		}
 
 		r = pollfn(pollfds, num_fds, ms_timeout);
-		if (r < 0)
+		if (r < 0) {
+			/* Signals shouldn't break us, unless they set
+			 * io_loop_return. */
+			if (errno == EINTR)
+				continue;
 			break;
+		}
 
 		for (i = 0; i < num_fds && !io_loop_return; i++) {
 			struct io_conn *c = (void *)fds[i];

ccan/ccan/opt/usage.c

@@ -4,7 +4,9 @@
 #include <sys/ioctl.h>
 #include <sys/termios.h> /* Required on Solaris for struct winsize */
 #endif
+#if HAVE_SYS_UNISTD_H
 #include <sys/unistd.h> /* Required on Solaris for ioctl */
+#endif
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>

ccan/ccan/tal/path/path.c

@@ -52,7 +52,7 @@ char *path_join(const tal_t *ctx, const char *base, const char *a)
 	ret = tal_dup_arr(ctx, char, base, len, 1 + strlen(a) + 1);
 	if (!ret)
 		goto out;
-	if (ret[len-1] != PATH_SEP)
+	if (len != 0 && ret[len-1] != PATH_SEP)
 		ret[len++] = PATH_SEP;
 	strcpy(ret + len, a);
 

ccan/ccan/tal/path/test/run-join.c

@@ -6,7 +6,7 @@ int main(void)
 {
 	char *path, *ctx = tal_strdup(NULL, "ctx");
 
-	plan_tests(34);
+	plan_tests(36);
 
 	path = path_join(ctx, "foo", "bar");
 	ok1(streq(path, "foo/bar"));
@@ -85,6 +85,11 @@ int main(void)
 	ok1(!path);
 	ok1(!tal_first(ctx));
 
+	path = path_join(ctx, "", "bar");
+	ok1(streq(path, "bar"));
+	ok1(tal_parent(path) == ctx);
+	tal_free(path);
+
 	tal_free(ctx);
 
 	return exit_status();

ccan/tools/configurator/configurator.c

@@ -315,6 +315,8 @@ static struct test tests[] = {
 	  "#include <sys/filio.h>\n" },
 	{ "HAVE_SYS_TERMIOS_H", OUTSIDE_MAIN, NULL, NULL,
 	  "#include <sys/termios.h>\n" },
+	{ "HAVE_SYS_UNISTD_H", OUTSIDE_MAIN, NULL, NULL,
+	  "#include <sys/unistd.h>\n" },
 	{ "HAVE_TYPEOF", INSIDE_MAIN, NULL, NULL,
 	  "__typeof__(argc) i; i = argc; return i == argc ? 0 : 1;" },
 	{ "HAVE_UNALIGNED_ACCESS", DEFINES_EVERYTHING|EXECUTE, NULL, NULL,