1 files changed, 112 insertions, 0 deletions
diff --git a/src/test/test-errno-util.c b/src/test/test-errno-util.c
new file mode 100644
index 0000000..376d532
--- /dev/null
+++ b/src/test/test-errno-util.c
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "errno-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "tests.h"
+
+TEST(strerror_not_threadsafe) {
+        /* Just check that strerror really is not thread-safe. */
+        log_info("strerror(%d) → %s", 200, strerror(200));
+        log_info("strerror(%d) → %s", 201, strerror(201));
+        log_info("strerror(%d) → %s", INT_MAX, strerror(INT_MAX));
+
+        log_info("strerror(%d), strerror(%d) → %p, %p", 200, 201, strerror(200), strerror(201));
+
+        /* This call is not allowed, because the first returned string becomes invalid when
+         * we call strerror the second time:
+         *
+         * log_info("strerror(%d), strerror(%d) → %s, %s", 200, 201, strerror(200), strerror(201));
+         */
+}
+
+TEST(STRERROR) {
+        /* Just check that STRERROR really is thread-safe. */
+        log_info("STRERROR(%d) → %s", 200, STRERROR(200));
+        log_info("STRERROR(%d) → %s", 201, STRERROR(201));
+        log_info("STRERROR(%d), STRERROR(%d) → %s, %s", 200, 201, STRERROR(200), STRERROR(201));
+
+        const char *a = STRERROR(200), *b = STRERROR(201);
+        assert_se(strstr(a, "200"));
+        assert_se(strstr(b, "201"));
+
+        /* Check with negative values */
+        assert_se(streq(a, STRERROR(-200)));
+        assert_se(streq(b, STRERROR(-201)));
+
+        const char *c = STRERROR(INT_MAX);
+        char buf[DECIMAL_STR_MAX(int)];
+        xsprintf(buf, "%d", INT_MAX);  /* INT_MAX is hexadecimal, use printf to convert to decimal */
+        log_info("STRERROR(%d) → %s", INT_MAX, c);
+        assert_se(strstr(c, buf));
+}
+
+TEST(STRERROR_OR_ELSE) {
+        log_info("STRERROR_OR_ELSE(0, \"EOF\") → %s", STRERROR_OR_EOF(0));
+        log_info("STRERROR_OR_ELSE(EPERM, \"EOF\") → %s", STRERROR_OR_EOF(EPERM));
+        log_info("STRERROR_OR_ELSE(-EPERM, \"EOF\") → %s", STRERROR_OR_EOF(-EPERM));
+}
+
+TEST(PROTECT_ERRNO) {
+        errno = 12;
+        {
+                PROTECT_ERRNO;
+                errno = 11;
+        }
+        assert_se(errno == 12);
+}
+
+static void test_unprotect_errno_inner_function(void) {
+        PROTECT_ERRNO;
+
+        errno = 2222;
+}
+
+TEST(UNPROTECT_ERRNO) {
+        errno = 4711;
+
+        PROTECT_ERRNO;
+
+        errno = 815;
+
+        UNPROTECT_ERRNO;
+
+        assert_se(errno == 4711);
+
+        test_unprotect_errno_inner_function();
+
+        assert_se(errno == 4711);
+}
+
+TEST(RET_GATHER) {
+        int x = 0, y = 2;
+
+        assert_se(RET_GATHER(x, 5) == 0);
+        assert_se(RET_GATHER(x, -5) == -5);
+        assert_se(RET_GATHER(x, -1) == -5);
+
+        assert_se(RET_GATHER(x, y++) == -5);
+        assert_se(y == 3);
+}
+
+TEST(ERRNO_IS_TRANSIENT) {
+        assert_se( ERRNO_IS_NEG_TRANSIENT(-EINTR));
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(EINTR));
+        assert_se( ERRNO_IS_TRANSIENT(-EINTR));
+        assert_se( ERRNO_IS_TRANSIENT(EINTR));
+
+        /* Test with type wider than int */
+        ssize_t r = -EAGAIN;
+        assert_se( ERRNO_IS_NEG_TRANSIENT(r));
+
+        /* On 64-bit arches, now (int) r == EAGAIN */
+        r = SSIZE_MAX - EAGAIN + 1;
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(r));
+
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(INT_MAX));
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(INT_MIN));
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(INTMAX_MAX));
+        assert_se(!ERRNO_IS_NEG_TRANSIENT(INTMAX_MIN));
+}
+
+DEFINE_TEST_MAIN(LOG_INFO);