tests: Add testcase to /dev/console

Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

build.mk

@@ -258,6 +258,7 @@ tests += tests/tst-fpu.so
 tests += tests/tst-preempt.so
 tests += tests/tst-tracepoint.so
 tests += tests/tst-hub.so
+tests += tests/misc-console.so
 tests += tests/misc-leak.so
 tests += tests/misc-readbench.so
 tests += tests/misc-mmap-anon-perf.so

tests/misc-console.cc

+/*
+ * Copyright (C) 2014 Cloudius Systems, Ltd.
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+
+int main(void)
+{
+    char buf[32], ch;
+    int i, ret;
+
+    if (close(0) == -1) {
+        perror("close fd 0");
+        return -1;
+    }
+
+    ret = open("/dev/console", O_RDONLY);
+    if (ret == -1) {
+        perror("open /dev/console");
+        return -1;
+    } else if (ret != 0) {
+        fprintf(stderr, "fd to /dev/console isn't 0\n");
+        return -1;
+    }
+
+    if (!isatty(0)) {
+        fprintf(stderr, "fd 0 isn't a tty\n");
+        return -1;
+    }
+
+    for (i = 0; i < 32; i++) {
+        ret = read(0, &ch, 1);
+        if (ret == -1) {
+            perror("read");
+            return -1;
+        } else if (ret == 0) {
+            // handle EOF
+            buf[i] = '\n';
+            break;
+        }
+
+        buf[i] = ch;
+        if (ch == '\n') {
+            break;
+        }
+    }
+    buf[i+1] = '\0';
+    printf("%s", buf);
+    return 0;
+}