F_SETFD           345 execwrappers.cpp       fcntl(i, F_SETFD, flags & ~FD_CLOEXEC);
F_SETFD            84 popen.cpp          fcntl(pipe_fds[0], F_SETFD, FD_CLOEXEC);
F_SETFD            85 popen.cpp          fcntl(pipe_fds[1], F_SETFD, FD_CLOEXEC);
F_SETFD           122 popen.cpp          fcntl(child_std_fd, F_SETFD, 0);
F_SETFD           136 popen.cpp            fcntl(parent_fd, F_SETFD, 0);