zdtm: Send two descriptors via unix socket

Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm/static/Makefile

@@ -155,6 +155,7 @@ TST_NOFILE	:=				\
 		remap_dead_pid_root			\
 		scm00				\
 		scm01				\
+		scm02				\
 		aio00				\
 		aio01				\
 		fd				\
@@ -441,6 +442,7 @@ mnt_ext_manual:		CFLAGS += -D ZDTM_EXTMAP_MANUAL
 sigpending:		LDLIBS += -lrt
 vdso01:			LDLIBS += -lrt
 scm01:			CFLAGS += -DKEEP_SENT_FD
+scm02:			CFLAGS += -DSEND_BOTH
 mntns_link_remap:	CFLAGS += -DZDTM_LINK_REMAP
 mntns_shared_bind02:	CFLAGS += -DSHARED_BIND02
 mntns_root_bind02:	CFLAGS += -DROOT_BIND02

test/zdtm/static/scm00.c

@@ -91,12 +91,20 @@ int main(int argc, char **argv)
 
 #ifndef KEEP_SENT_FD
 	close(p[0]);
-
+#ifdef SEND_BOTH
+	if (send_fd(sk[0], p[1]) < 0) {
+		pr_perror("Can't send 2nd descriptor");
+		exit(1);
+	}
+	close(p[1]);
+	p[0] = p[1] = -1;
+#else
 	/* Swap pipe ends to make scm recv put pipe into different place */
 	dup2(p[1], p[0]);
 	close(p[1]);
 	p[1] = p[0];
 	p[0] = -1;
+#endif
 #endif
 
 	test_daemon();
@@ -107,6 +115,16 @@ int main(int argc, char **argv)
 		fail("Can't recv pipe back (%d)", p[0]);
 		goto out;
 	}
+
+#ifdef SEND_BOTH
+	test_msg("Recv 2nd end\n");
+	p[1] = recv_fd(sk[1]);
+	if (p[1] < 0) {
+		fail("Can't recv 2nd pipe back (%d)", p[1]);
+		goto out;
+	}
+#endif
+
 #ifdef KEEP_SENT_FD
 	if (rfd == p[0]) {
 		fail("Original descriptor not kept");

test/zdtm/static/scm02.c

+scm00.c
\ No newline at end of file

test/zdtm/static/scm02.desc

+{'flags': 'crfail'}