support: Add signal support to support_capture_subprocess_check

Signal zero does not terminate a process, so it is safe to use negative
values for signal numbers.

Adjust libio/tst-vtables-common.c to use this new functionality,
instead of determining the termination status for a signal indirectly.

1 files changed, 14 insertions, 0 deletions

diff --git a/support/tst-support_capture_subprocess.c b/support/tst-support_capture_subprocess.c
index a685256091..5339e85b07 100644
--- a/support/tst-support_capture_subprocess.c
+++ b/support/tst-support_capture_subprocess.c
@@ -168,15 +168,29 @@ do_test (void)
                 = support_capture_subprocess (callback, &test);
               check_stream ("stdout", &result.out, test.out);
               check_stream ("stderr", &result.err, test.err);
+
+              /* Allowed output for support_capture_subprocess_check.  */
+              int check_allow = 0;
+              if (lengths[length_idx_stdout] > 0)
+                check_allow |= sc_allow_stdout;
+              if (lengths[length_idx_stderr] > 0)
+                check_allow |= sc_allow_stderr;
+              if (check_allow == 0)
+                check_allow = sc_allow_none;
+
               if (test.signal != 0)
                 {
                   TEST_VERIFY (WIFSIGNALED (result.status));
                   TEST_VERIFY (WTERMSIG (result.status) == test.signal);
+                  support_capture_subprocess_check (&result, "signal",
+                                                    -SIGTERM, check_allow);
                 }
               else
                 {
                   TEST_VERIFY (WIFEXITED (result.status));
                   TEST_VERIFY (WEXITSTATUS (result.status) == test.status);
+                  support_capture_subprocess_check (&result, "exit",
+                                                    test.status, check_allow);
                 }
               support_capture_subprocess_free (&result);
               free (test.out);