test: add generic unlink wrapper

reduce library uses unlink, but the unit tests need to
override it in a specific way.

But linking unit tests with LTO requires the wrapper
definitions be in objects/libraries listed *after*
the object/library that refers to it.  So we need to
make the unlink wrapper somewhat generic.  We do this
by exporting a string and callback function that the
user can set to enable a user-defined function to be
called when unlink() is called with a specific file
name.

Also revert 3ef6d06 as part of this patch, since we
no longer require the workaround that it implemented.

Fixes issue #1357.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I1ee4c424ad31fe7d91d7b524ed47aedd279e5b5c
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1948
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>

autopackage.sh

@@ -36,7 +36,7 @@ fi
 timing_enter build_release
 
 if [ $(uname -s) = Linux ]; then
-	./configure $(get_config_params) --disable-debug --enable-lto --disable-unit-tests
+	./configure $(get_config_params) --disable-debug --enable-lto
 else
 	# LTO needs a special compiler to work on BSD.
 	./configure $(get_config_params) --disable-debug

configure

@@ -499,11 +499,6 @@ if [[ "${CONFIG[ISAL]}" = "n" ]] && [[ "${CONFIG[REDUCE]}" = "y" ]]; then
 		exit 1
 fi
 
-if [[ "${CONFIG[LTO]}" = "y" ]] && [[ "${CONFIG[UNIT_TESTS]}" = "y"  ]]; then
-		echo "ERROR Conflicting options: --enable-lto is not compatible with --enable-unit-tests."
-		exit 1
-fi
-
 if [ -z "${CONFIG[ENV]}" ]; then
 	CONFIG[ENV]=$rootdir/lib/env_dpdk
 	echo "Using default SPDK env in ${CONFIG[ENV]}"

include/spdk_internal/mock.h

@@ -122,4 +122,14 @@ DECLARE_WRAPPER(sendmsg, ssize_t, (int sockfd, const struct msghdr *msg, int fla
 
 DECLARE_WRAPPER(writev, ssize_t, (int fd, const struct iovec *iov, int iovcnt));
 
+/* unlink is done a bit differently. */
+extern char *g_unlink_path;
+extern void (*g_unlink_callback)(void);
+/* If g_unlink_path is NULL, __wrap_unlink will return ENOENT.
+ * If the __wrap_unlink() parameter does not match g_unlink_path, it will return ENOENT.
+ * If g_unlink_path does match, and g_unlink_callback has been set, g_unlink_callback will
+ * be called before returning 0.
+ */
+int __wrap_unlink(const char *path);
+
 #endif /* SPDK_INTERNAL_MOCK_H */

lib/ut_mock/mock.c

@@ -48,3 +48,24 @@ DEFINE_WRAPPER(sendmsg, ssize_t, (int sockfd, const struct msghdr *msg, int flag
 		flags))
 
 DEFINE_WRAPPER(writev, ssize_t, (int fd, const struct iovec *iov, int iovcnt), (fd, iov, iovcnt))
+
+char *g_unlink_path;
+void (*g_unlink_callback)(void);
+
+int
+__attribute__((used))
+__wrap_unlink(const char *path)
+{
+	if (g_unlink_path == NULL) {
+		return ENOENT;
+	}
+
+	if (strcmp(g_unlink_path, path) != 0) {
+		return ENOENT;
+	}
+
+	if (g_unlink_callback) {
+		g_unlink_callback();
+	}
+	return 0;
+}

test/unit/lib/reduce/reduce.c/reduce_ut.c

@@ -176,17 +176,10 @@ persistent_pm_buf_destroy(void)
 	g_persistent_pm_buf_len = 0;
 }
 
-int __wrap_unlink(const char *path);
+static void
-
+unlink_cb(void)
-int
-__wrap_unlink(const char *path)
 {
-	if (strcmp(g_path, path) != 0) {
-		return ENOENT;
-	}
-
 	persistent_pm_buf_destroy();
-	return 0;
 }
 
 static void
@@ -1296,6 +1289,9 @@ main(int argc, char **argv)
 	CU_ADD_TEST(suite, overlapped);
 	CU_ADD_TEST(suite, compress_algorithm);
 
+	g_unlink_path = g_path;
+	g_unlink_callback = unlink_cb;
+
 	CU_basic_set_mode(CU_BRM_VERBOSE);
 	CU_basic_run_tests();
 	num_failures = CU_get_number_of_failures();