instead of just this:
unlink("/foo/bar/baz");
+
+- Don't invoke exit(), ever. It is not replacement for proper error
+ handling. Please escalate errors up your call chain, and use normal
+ "return" to exit from the main function of a process. If you
+ fork()ed off a child process, please use _exit() instead of exit(),
+ so that the exit handlers are not run.
+
+- Please never use dup(). Use fcntl(fd, F_DUPFD_CLOEXEC, 3)
+ instead. For two reason: first, you want O_CLOEXEC set on the new fd
+ (see above). Second, dup() will happily duplicate your fd as 0, 1,
+ 2, i.e. stdin, stdout, stderr, should those fds be closed. Given the
+ special semantics of those fds, it's probably a good idea to avoid
+ them. F_DUPFD_CLOEXEC with "3" as parameter avoids them.