Re: Changing argv[0] under Linux.

Richard B. Johnson (root@chaos.analogic.com)
Tue, 14 Jan 2003 14:56:35 -0500 (EST)


On Tue, 14 Jan 2003, DervishD wrote:

> Hi Richard :)
>
> > > Any header where I can see the length for argv[0] or is this some
> > > kind of unoficial standard? Just doing strcpy seems dangerous to me
> > > (you can read 'paranoid'...).
> > They need to have space for _POSIX_PATH_MAX (512 bytes), to
> > claim POSIX compatibility so any POSIX system will have at
> > least 512 bytes available because the pathname of the executable
> > normally goes there.
>
> Enough for me, then. Thanks a lot :)) Just one more thing: in my
> Single Unix Spec v3 says that the minimum value of _POSIX_PATH_MAX is
> 256, not 512, and the libc manual says just the same :??
>
> Anyway, 256 bytes is a fair large amount ;))))
>
> Thanks again, Richard.
>
> Raśl
>
Well I just grepped through usr/include/bits/posix1_lim.h and it
shows 255 (with this 'C' library) so you are probably right.

In any event, a "whole line of text" isn't going to overrun it.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Why is the government concerned about the lunatic fringe? Think about it.

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