[LTP] [PATCH 1/3] Add tst_validate_children() helper function

[Martin Doucha]

The function waits for given number of child processes and validates
that they have all exited without error.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---
 include/tst_test.h |  8 ++++++++
 lib/tst_res.c      | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/include/tst_test.h b/include/tst_test.h
index ac52f268c..69e649651 100644
--- a/include/tst_test.h
+++ b/include/tst_test.h
@@ -362,6 +362,14 @@ void tst_set_max_runtime(int max_runtime);
  */
 char *tst_get_tmpdir(void);
 
+/*
+ * Validates exit status of child processes
+ */
+int tst_validate_children_(const char *file, const int lineno,
+	unsigned int count);
+#define tst_validate_children(child_count) \
+	tst_validate_children_(__FILE__, __LINE__, (child_count))
+
 #ifndef TST_NO_DEFAULT_MAIN
 
 static struct tst_test test;
diff --git a/lib/tst_res.c b/lib/tst_res.c
index e0896eb05..cac7484e7 100644
--- a/lib/tst_res.c
+++ b/lib/tst_res.c
@@ -613,3 +613,40 @@ void tst_require_root(void)
 	if (geteuid() != 0)
 		tst_brkm(TCONF, NULL, "Test needs to be run as root");
 }
+
+int tst_validate_children_(const char *file, const int lineno,
+	unsigned int count)
+{
+	unsigned int i;
+	int status;
+
+	for (i = 0; i < count; i++) {
+		SAFE_WAITPID(NULL, -1, &status, 0);
+
+		if (WIFSIGNALED(status)) {
+			tst_res_(file, lineno, TFAIL,
+				"Child killed by signal %d %s",
+				WTERMSIG(status), tst_strsig(WTERMSIG(status)));
+			return 1;
+		}
+
+		if (WCOREDUMP(status)) {
+			tst_res_(file, lineno, TFAIL, "Child crashed");
+			return 1;
+		}
+
+		if (!WIFEXITED(status)) {
+			tst_res_(file, lineno, TFAIL,
+				"Unexpected child status");
+			return 1;
+		}
+
+		if (WEXITSTATUS(status)) {
+			tst_res_(file, lineno, TFAIL, "Child returned error %d",
+				WEXITSTATUS(status));
+			return 1;
+		}
+	}
+
+	return 0;
+}
-- 
2.37.2