[PATCH i-g-t] lib/igt_aux.c: since procps-ng 4.0.5, PIDS_VAL() takes 3 arguments, not 4

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Unfortunately, the API of procps-ng has changed between procps-ng
4.0.4 and procps-ng 4.0.5, with the PIDS_VAL() macro changing in
upstream commit
https://gitlab.com/procps-ng/procps/-/commit/967fdcfb06e20aad0f31073474cb94545c9bdea5.

This API breakage has been reported upstream as of
https://gitlab.com/procps-ng/procps/-/issues/366, but in the mean
time, the build of igt-gpu-tools breaks with:

../lib/igt_aux.c:1358:78: error: macro "PIDS_VAL" passed 4 arguments, but takes just 3

We fix this by detecting the version of the libproc2 library, and
adjusting accordingly how PIDS_VAL() gets used.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 lib/igt_aux.c | 7 +++++++
 meson.build   | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 3407cc4f2..f5bf48da6 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -1358,10 +1358,17 @@ static bool get_process_ids(struct igt_process *prcs)
 	prcs->comm = NULL;
 	prcs->stack = procps_pids_get(prcs->info, PIDS_FETCH_TASKS_ONLY);
 	if (prcs->stack) {
+#if defined(HAVE_LIBPROC2_POST_4_0_5_API)
+		prcs->tid = PIDS_VAL(EU_PID, s_int, prcs->stack);
+		prcs->euid = PIDS_VAL(EU_EUID, s_int, prcs->stack);
+		prcs->egid = PIDS_VAL(EU_EGID, s_int, prcs->stack);
+		prcs->comm = PIDS_VAL(EU_CMD, str, prcs->stack);
+#else
 		prcs->tid = PIDS_VAL(EU_PID, s_int, prcs->stack, prcs->info);
 		prcs->euid = PIDS_VAL(EU_EUID, s_int, prcs->stack, prcs->info);
 		prcs->egid = PIDS_VAL(EU_EGID, s_int, prcs->stack, prcs->info);
 		prcs->comm = PIDS_VAL(EU_CMD, str, prcs->stack, prcs->info);
+#endif
 	}
 #endif
 	return prcs->tid != 0;
diff --git a/meson.build b/meson.build
index 8b2a2a64a..f3e645c4d 100644
--- a/meson.build
+++ b/meson.build
@@ -139,6 +139,9 @@ if libprocps.found()
   config.set('HAVE_LIBPROCPS', 1)
 elif libproc2.found()
   config.set('HAVE_LIBPROC2', 1)
+  if libproc2.version().version_compare('>= 4.0.5')
+    config.set('HAVE_LIBPROC2_POST_4_0_5_API', 1)
+  endif
 else
   error('Either libprocps or libproc2 is required')
 endif
-- 
2.47.1