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Date: Mon, 26 Feb 2001 13:21:56 +0300
From: Egor Duda <deo AT logos-m DOT ru>
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Reply-To: Egor Duda <cygwin AT cygwin DOT com>
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Message-ID: <1973702904.20010226132156@logos-m.ru>
To: Jesper Eskilson <jojo AT virtutech DOT se>
CC: cygwin AT cygwin DOT com
Subject: Re: lseek() fails to seek on /dev/fd0 ('\\.\A:')
In-reply-To: <u67ae79bw6v.fsf@rachel.hq.vtech>
References: <u67ae79bw6v DOT fsf AT rachel DOT hq DOT vtech>
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Hi!

Monday, 26 February, 2001 Jesper Eskilson jojo AT virtutech DOT se wrote:

JE> /* lseek_bug.c */

JE> #include <stdio.h>
JE> #include <fcntl.h>
JE> #include <errno.h>

JE> int main(int argc, char *argv[]) 
JE> {
JE>   /* Mount /dev/fd0 as: mount -b '\\.\A:' /dev/fd0 */

JE>   char *filename = "/dev/fd0";
JE>   int fd, i;

JE>   fd = open(filename, O_RDONLY);
JE>   if (fd != -1) {
JE>     for (i = 0; i < 4; i++) {
JE>       printf("\nlseek():ing %d bytes from start of %s.\n", i, filename);
JE>       lseek(fd, SEEK_SET, i);
JE>       perror("lseek()");
JE>     }
JE>   }
JE>   return 0;
JE> }

the correct prototype of lseek is

off_t lseek(int fildes, off_t offset, int whence);

your program should read like this:

lseek(fd, i, SEEK_SET);

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19



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