[LTP] [PATCH v2 1/3] Add tst_validate_children() helper function

[Martin Doucha <mdoucha@suse.cz>]

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>
---

Changes since v1:
- Moved tst_validate_children_() to lib/tst_status.c
- Simplified the code using tst_strstatus()

 include/tst_test.h |  8 ++++++++
 lib/tst_status.c   | 20 ++++++++++++++++++++
 2 files changed, 28 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_status.c b/lib/tst_status.c
index 9124faaa3..5d03871f3 100644
--- a/lib/tst_status.c
+++ b/lib/tst_status.c
@@ -49,3 +49,23 @@ const char *tst_strstatus(int status)
 
 	return invalid(status);
 }
+
+int tst_validate_children_(const char *file, const int lineno,
+	unsigned int count)
+{
+	unsigned int i;
+	int status;
+	pid_t pid;
+
+	for (i = 0; i < count; i++) {
+		pid = SAFE_WAITPID(-1, &status, 0);
+
+		if (!WIFEXITED(status) || WEXITSTATUS(status)) {
+			tst_res_(file, lineno, TFAIL, "Child %d: %s", pid,
+				tst_strstatus(status));
+			return 1;
+		}
+	}
+
+	return 0;
+}
-- 
2.37.3


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