tests: improve setugid error diagnostics a bit

[strace] / tests / setugid.c

diff --git a/tests/setugid.c b/tests/setugid.c
index aba277c5904c72aa1a5f16394ef70105e354f7a9..317a32acd4aa0abcc78b423ae293867f3616a5f3 100644 (file)
--- a/tests/setugid.c
+++ b/tests/setugid.c
@@ -61,6 +61,8 @@ main(void)
                const unsigned int num = (unsigned UGID_TYPE) tests[i];
                long expected;
 
+               errno = 0;
+
                if (num == ugid)
                        expected = 0;
                else if ((UGID_TYPE) num == (UGID_TYPE) -1U)
@@ -77,8 +79,9 @@ main(void)
                                       SYSCALL_NAME, ugid, errstr);
                                break;
                        }
-                       perror_msg_and_fail("%s(%#lx) != %ld",
-                                           SYSCALL_NAME, tests[i], expected);
+                       perror_msg_and_fail("%s(%#lx) = %ld != %ld",
+                                           SYSCALL_NAME, tests[i],
+                                           rc, expected);
                }
 
                printf("%s(", SYSCALL_NAME);