Hook BSD err(), errx(), warn(), warnx(), etc. functions.

err(), errx(), warn(), warnx(), verr(), verrx(), vwarn(), vwarnx() are
hooked.

tests/example.h

@@ -0,0 +1,38 @@
+/*
+ * Helper functions/macros for example files.
+ *
+ * Copyright (C) 2013  Simon Ruderich
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#define FORKED_TEST(pid) \
+    pid = fork(); \
+    if (pid == -1) { \
+        perror("fork"); \
+        exit(EXIT_FAILURE); \
+    } else if (pid != 0) { \
+        int status; \
+        if (waitpid(pid, &status, 0) == -1) { \
+            perror("waitpid"); \
+            exit(EXIT_FAILURE); \
+        } \
+        if (WIFEXITED(status)) { \
+            printf("exit code: %d\n", WEXITSTATUS(status)); \
+        } else { \
+            printf("child terminated!\n"); \
+        } \
+        fflush(stdout); \
+    } else