On Tue, Sep 01, 2015 at 07:07:34PM -0700, Isaac Dunham wrote:
> Thus, I'm thinking that the following prototypes would be better:
>
> /* create a pipe, spawn a temporary pager,
> * dup()s fd 1 and possibly fd 2 before redirecting to the pipe
> * if an fd is not dup()'d, set the corresponding duplicate to -1
> */
> pid_t setup_temporary_pager(int *dupout, int *duperr);
>
> /* close the pipe, dup2() the saved fds back over fds 1/2,
> * close the duplicates, and wait for the temporary pager to exit
> * if either fd is -1, skip it.
> */
> void close_pager(pid, int dupout, int duperr);
>
>
> setup_temporary_pager will return -1 if it does not spawn the pager
> (whether by failure or by PAGER=cat), or if there are problems during
> the redirection dance.
> It will refuse to spawn a pager if (!isatty(STDOUT_FILENO)).
Yes, on non-tty stdout the both functions have to do nothing.
> Does this sound sensible?
Yes, go ahead.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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