Messages in this thread | | | Date | Sat, 14 Apr 2001 10:44:46 -0700 (PDT) | From | Rob Landley <> | Subject | Re: How do I make a circular pipe? |
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> > Apparently, the pipe > > fd's evaporate when the process does an execve. > > Check out: > > #include <unistd.h> > #include <fcntl.h> > > /* ... */ > > fcntl (fd, F_SETFD, (long) FD_CLOEXEC); > > to set/reset the close on exec bit.
Cool. That's EXACTLY what I was looking for. Thanks.
Thanks also to the people who pointed out pppd's "pty" option (yes I read the docs on that, but they're a bit cryptic). And yes, my pseudo-code example used fd[0] twice. Thanks. You can stop emailing me now. :)
> You might want to check out something like Stevens > advanced UNIX programming, though it is probably > somewhat dated :-)
I've got about fifteen books with names like that, but strangely in real world situations I keep trying to use the man pages instead. Sad, I know...
> At a guess I would say that the reason is you don't > have as much control with pipes as you do with > devices. Under the standard termios, you can tell > the system to not return from the read until either n > characters have been read, or a given character such > as a newline has been read. You can also switch to > alternative line disciplines that are more targeted > to a given application such as PPP, etc.
Hmmm. And the reason these cool toys aren't available as some kind of wrapper around a normal read-from-fd is...? (Performance?)
> You probably want to check out pseudo tty's (pty's), > which allow you to create your own terminal.
This occurred to me in the car on the way home after five hours messing with this. (Of course. :)
> Here is the glibc documentation,
Thanks.
Info. Never thought to check info. Here I am checking linuxdoc's howtos, man pages, and google... Sigh... I don't suppose there's an info2html tool anywhere?
Well what do you know, there is. (I LIKE Google.)
http://www.cs.dartmouth.edu/~jonh/info2html/
Rob
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