Date: Thu, 07 Aug 2008 16:46:37 +0200 From: Gabor Kovesdan <gabor@kovesdan.org> To: hackers@FreeBSD.org Cc: fjoe@FreeBSD.org Subject: strange issue reading /dev/null Message-ID: <489B0ACD.80008@kovesdan.org>
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Hello,
I'm wondering why fgetc() returns 0xff if called with /dev/null:
#include <stdio.h>
#include <stdlib.h>
int
main(void)
{
int c;
FILE *f;
f = fopen("/dev/null", "r");
if (c != EOF)
printf("%c\n", fgetc(f));
}
> gcc foo.c
> ./a.out
˙
This causes a bug in BSD grep as /dev/null is not distinguished from
ordinary files in the code, thus I was expecting it just returned EOF,
but in reality this is not the case. How such cases should be handled?
Thanks in advance,
Gábor
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