[S] Change in flashrom[master]: tests: Detect gcov run and redirect to real I/O functions

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has submitted this change. ( https://review.coreboot.org/c/flashrom/+/69266 )

(

13 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: tests: Detect gcov run and redirect to real I/O functions
......................................................................

tests: Detect gcov run and redirect to real I/O functions

Code coverage writes data to disk, we need to use real io functions at
this point so that the data is really written.

BUG=b:187647884
BRANCH=None
TEST=meson test
TEST=ninja coverage

Change-Id: If06053ecd78e886c8f7fc55813f4b5635be78c6b
Signed-off-by: Evan Benn 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/69266
Reviewed-by: Anastasia Klimchuk 
Tested-by: build bot (Jenkins) 
---
M Documentation/building.md
M tests/tests.c
2 files changed, 35 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Anastasia Klimchuk: Looks good to me, approved

diff --git a/Documentation/building.md b/Documentation/building.md
index aabb45b..81daeb0 100644
--- a/Documentation/building.md
+++ b/Documentation/building.md
@@ -48,6 +48,18 @@
 ninja -C builddir test
 ```

+### Run unit tests with code coverage
+#### gcov
+Due to a bug in lcov, the html file will only be correct if lcov is not
+installed and gcovr is installed. See
+https://github.com/linux-test-project/lcov/issues/168
+https://github.com/mesonbuild/meson/issues/6747
+```
+meson setup buildcov -Db_coverage=true
+ninja -C buildcov test
+ninja -C buildcov coverage
+```
+
 ## System specific information
 ### Ubuntu / Debian (Linux)
   * __linux-headers__ are version specific
diff --git a/tests/tests.c b/tests/tests.c
index 41972ba..b11f642 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -17,6 +17,7 @@
 #include "io_mock.h"
 #include "tests.h"
 #include "wraps.h"
+#include "io_real.h"

#include <stdio.h>
 #include <string.h>
@@ -77,6 +78,7 @@

static int mock_open(const char *pathname, int flags, mode_t mode)
 {
+	maybe_unmock_io(pathname);
    if (get_io() && get_io()->iom_open)
    	return get_io()->iom_open(get_io()->state, pathname, flags, mode);