From: Enrique Perez-Terron <enrique@perezterron.net>
To: cygwin@cygwin.com
Subject: Re: pread() from /dev/sda fails with: Illegal seek
Date: Sat, 11 Jan 2020 20:24:00 -0000 [thread overview]
Message-ID: <9f7d495f0551f31b41b046db68ca59ae@perezterron.net> (raw)
In-Reply-To: <CAPJ9Yc-9SaxHRnTVHCFnbh1nuS9KV7ZJLqqB=ES=Ymnc9EaWSg@mail.gmail.com>
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Den 2020-01-11 15:10, skrev David Balažic:
> pread on /dev/sda fails with Illegal seek.
Confirmed on windows 10, 64-bit.
My code:
$ cat t.c
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
int main(int argc, char *argv[])
{
int fd = open("/dev/sda", O_RDONLY, 0);
if (fd < 0) {
fprintf(stderr, "%s. open /dev/sda: %m\n", argv[0]);
exit(1);
}
char *buffer = malloc(512);
if (!buffer) {
fprintf(stderr, "%s: Out of memory\n", argv[0]);
exit(1);
}
int result = pread(fd, buffer, 512, 0);
if (result < 0) {
fprintf(stderr, "%s: pread: %m\n", argv[0]);
exit(1);
}
printf("All right!\n");
return 0;
}
Running in a mintty as Administrator:
$ ./t
./t: pread: Illegal seek
$ uname -a
CYGWIN_NT-10.0 panter 3.1.2(0.340/5/3) 2019-12-21 15:25 x86_64 Cygwin
$ cc --version
cc (GCC) 7.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
Regards,
Enrique Perez-Terron
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next prev parent reply other threads:[~2020-01-11 20:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-11 14:10 David Balažic
2020-01-11 20:24 ` Enrique Perez-Terron [this message]
2020-01-12 16:59 ` Christian Franke
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