[igt-dev] [PATCH i-g-t v3 3/9] lib/aux: Typecast gettid() as pid_t

[Lyude]

From: Lyude Paul <lyude at redhat.com>

Partly, for correctness. But mostly because not typecasting properly
causes the gettid() macro provided by newer glibc to be typed as pid_t
(aka int), while ours is typed as long. Causing annoying warnings:

[158/846] Compiling C object 'tests/59830eb@@drm_import_export at exe/drm_import_export.c.o'.
In file included from ../../mnt/vol/lib/drmtest.h:39,
                 from ../../mnt/vol/lib/igt.h:27,
                 from ../../mnt/vol/tests/drm_import_export.c:27:
../../mnt/vol/tests/drm_import_export.c: In function ‘test_thread’:
../../mnt/vol/tests/drm_import_export.c:123:12: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 4 has type ‘__pid_t’ {aka ‘int’} [-Wformat=]
  123 |  igt_debug("start %ld\n", gettid());
      |            ^~~~~~~~~~~~~  ~~~~~~~~
      |                           |
      |                           __pid_t {aka int}
../../mnt/vol/lib/igt_core.h:875:64: note: in definition of macro ‘igt_debug’
  875 | #define igt_debug(f...) igt_log(IGT_LOG_DOMAIN, IGT_LOG_DEBUG, f)
      |                                                                ^
../../mnt/vol/tests/drm_import_export.c:123:21: note: format string is defined here
  123 |  igt_debug("start %ld\n", gettid());
      |                   ~~^
      |                     |
      |                     long int
      |                   %d

So, typecast gettid() as pid_t and update all of our callers accordingly

Signed-off-by: Lyude Paul <lyude at redhat.com>
---
 lib/igt_aux.h             | 3 ++-
 tests/drm_import_export.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index cbcb1844..7dfcacb1 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -32,6 +32,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <sys/time.h>
+#include <sys/types.h>
 #ifdef __linux__
 # include <sys/syscall.h>
 #endif
@@ -40,7 +41,7 @@
 
 /* signal interrupt helpers */
 #ifdef __linux__
-# define gettid() syscall(__NR_gettid)
+# define gettid() (pid_t)(syscall(__NR_gettid))
 #endif
 #define sigev_notify_thread_id _sigev_un._tid
 
diff --git a/tests/drm_import_export.c b/tests/drm_import_export.c
index e1b0abae..f79c09db 100644
--- a/tests/drm_import_export.c
+++ b/tests/drm_import_export.c
@@ -120,7 +120,7 @@ static void start_test(void)
 static void * test_thread(void * par)
 {
 #ifdef __linux__
-	igt_debug("start %ld\n", gettid());
+	igt_debug("start %ld\n", (long) gettid());
 #else
 	igt_debug("start %ld\n", (long) pthread_self());
 #endif
-- 
2.20.1