Bruno Haible wrote:
> Thanks for explaining. I think an alternative for bash would be to
> temporarily set the file descriptor to point to /dev/null and do a
> second fflush. Like this (error checking omitted):
>
> FILE *fp = ... /* stdout or stderr */;
> if (fflush (fp) < 0)
> {
> #if GNULIB_PROVIDES_FPURGE
> fpurge (fp);
> #else
> int fd = fileno (fp);
> int saved_fd = dup (fd);
> int sink_fd = open ("/dev/null", O_WRONLY);
> dup2 (sink_fd, fd);
> fflush (fp);
> close (sink_fd);
> dup2 (saved_fd, fd);
> close (saved_fd);
> #endif
> }
That seems like a lot of trouble (and there's more that you have here,
since bash also has to worry about the close-on-exec state of the file
descriptor). A simple solution is to turn the #error into a #warning,
and add a return 0 to make the function into a no-op, on the assumption
that those versions of libc for which this is a problem (later versions
of glibc) already provide fpurge.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Chet Ramey, ITS, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
