2013-05-10  Joel Brobecker  <brobecker@adacore.com>
	    Tom Tromey  <tromey@redhat.com>

	* common/filestuff.c (mark_fd_no_cloexec, unmark_fd_no_cloexec):
	New functions.
	* common/filestuff.c (mark_fd_no_cloexec, unmark_fd_no_cloexec):
	Declare.
	* darwin-nat.c (darwin_pre_ptrace): Use mark_fd_no_cloexec.
	(darwin_ptrace_him): Use unmark_fd_no_cloexec.
	* inf-ttrace.c (do_cleanup_pfds): Use unmark_fd_no_cloexec.
	(inf_ttrace_prepare): Use mark_fd_no_cloexec.