tests: Add a test for ssh_channel().

tests/unittests/CMakeLists.txt

@@ -13,4 +13,6 @@ if (UNIX AND NOT WIN32)
     add_cmocka_test(torture_pki torture_pki.c ${TORTURE_LIBRARY})
     # requires pthread
     add_cmocka_test(torture_rand torture_rand.c ${TORTURE_LIBRARY})
+    # requires /dev/null
+    add_cmocka_test(torture_channel torture_channel.c ${TORTURE_LIBRARY})
 endif (UNIX AND NOT WIN32)

tests/unittests/torture_channel.c

@@ -0,0 +1,48 @@
+#define LIBSSH_STATIC
+#include <libssh/priv.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "torture.h"
+#include "channels.c"
+
+static void torture_channel_select(void **state)
+{
+    fd_set readfds;
+    int fd;
+    int rc;
+    int i;
+
+    (void)state; /* unused */
+
+    fd = open("/dev/null", 0);
+    assert_true(fd > 2);
+
+    FD_SET(fd, &readfds);
+
+    for (i = 0; i < 10; i++) {
+        ssh_channel cin[1] = { NULL, };
+        ssh_channel cout[1] = { NULL, };
+        struct timeval tv = { .tv_sec = 0, .tv_usec = 1000 };
+
+        rc = ssh_select(cin, cout, fd + 1, &readfds, &tv);
+        assert_int_equal(rc, SSH_OK);
+    }
+
+    close(fd);
+}
+
+int torture_run_tests(void) {
+    int rc;
+    const UnitTest tests[] = {
+        unit_test(torture_channel_select),
+    };
+
+    ssh_init();
+    rc = run_tests(tests);
+    ssh_finalize();
+
+    return rc;
+}