Changing argv[0] under Linux.
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"Richard" == Richard B Johnson <[email protected]> writes:
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Hi Richard :)
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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.
No, because argv[0] is followed immediately by a NUL then argv[1], then argv[2], etc. They're not fixed length strings -- the kernel allocates just enough for the actual arguments, rounded up to PAGESIZE.
So if you copy more than strlen(argv[0]), you'll start overwriting argv[1].
--
Dr Peter Chubb [email protected]
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