Thread: How to retrieve the output of an external program?
Hi list & happy easter,
What I'd like to be able to do is:
* Run a function that sends parms to an external pgm [no PB],
* Capture the external pgm output that normally goes to stdout.
Is it possible directly or am I obliged to use a temporary file
and retrieve it from my function?
JY
--
printk("ufs_read_super: fucking Sun blows me\n");
-- /usr/src/linux/fs/ufs/ufs_super.c
On 8 January 2012 19:29, Jean-Yves F. Barbier <12ukwn@gmail.com> wrote: > Hi list & happy easter, It's a bit too early for that, isn't it? Perhaps you meant Valentine's Day? :) > What I'd like to be able to do is: > * Run a function that sends parms to an external pgm [no PB], > * Capture the external pgm output that normally goes to stdout. > > Is it possible directly or am I obliged to use a temporary file > and retrieve it from my function? I'm not sure, since I've never tried something like this in Postgres, but perhaps pipe(2), dup2(2), and one of exec*(3) will help? I haven't read through these, but they might help too: http://stackoverflow.com/questions/3382485/reading-child-process-output-as-soon-as-some-is-available http://ubuntuforums.org/archive/index.php/t-1627614.html http://stackoverflow.com/questions/3835905/redirecting-forked-process-output-to-parent-process-in-c http://www.chemie.fu-berlin.de/chemnet/use/info/libc/libc_10.html -- Michael Wood <esiotrot@gmail.com>
On Sun, 8 Jan 2012 22:40:04 +0200 Michael Wood <esiotrot@gmail.com> wrote: > On 8 January 2012 19:29, Jean-Yves F. Barbier <12ukwn@gmail.com> wrote: > > Hi list & happy easter, > > It's a bit too early for that, isn't it? Perhaps you meant Valentine's Day? :) Oops, I meant happy turkey of independence that lay easter eggs:) … > I haven't read through these, but they might help too: > http://stackoverflow.com/questions/3382485/reading-child-process-output-as-soon-as-some-is-available Yes Mike, this should do the trick, thanks. JY -- A private sin is not so prejudicial in the world as a public indecency. -- Miguel de Cervantes