stdout (stdin and stderr) are an integral part of stdio.h, so it's as much a C-ism as a Unix-ism.
I don't know how the Windows environment would cope with this, but under Unix file-descriptor 0 is stdin, descriptor 1 is stdout, and 2 is stderr, and these are automatically opened before the execution of main() if one includes stdio.h. I should stress that I'm talking about PC-type processors now, rather than the SDCC device set - the underlying assumptions about the operating system don't exist for small devices, so stdio.h and its accompanying libraries would probably not be meaningful for a PIC or a Z80 or whatever. In Unix, suppose one were running a program called 'blinkey' - a nice example people seem to use... shell$ blinkey | more This would pipe the stdout from 'blinkey' through to stdin of 'more'. Anything blinkey wrote to stderr would appear on the screen, but if this was too much to cope with one could do this... shell$ blinkey 2> errors.txt The above means to redirect file descriptor 2 (stderr) to the errors.txt file. Similarly, the standard input can be pulled from a file, like this... shell$ blinkey < blinkey_input.txt And then one can get smart and combine these to do all kinds of crazy things! I *believe* Windows/DOS can do the standard input and output bits in similar fashion, but I have never had occasion to try it - I'm a dyed-in-the-wool Unix (Linux) nerd, you might gather. I don't know how Windows copes with descriptor 2 (stderr) if at all. On Saturday 30 August 2008 17:41:38 Richard Erlacher wrote: > Well, that's exactly the mechanism I mentioned ... I'm not surprised it has > a name ... but -stdout ... ??? That sounds like *nix. > > regards, > > Richard Erlacher > > ----- Original Message ----- <snip> -- Richard. PGP Key-id: 0x5AB3D350 A reactionary is a man whose political opinions always manage to keep up with yesterday. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
