Hi! I'm porting an app from Linux to Cygwin and stumbled on this problem:
pread on /dev/sda fails with Illegal seek.
The simplified code is:
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
unsigned int sector_size = 512;
void *buf = calloc(sector_size,1);
int fd = open("/dev/sda", O_DIRECT | O_RDONLY);
if (-1 == pread(fd, buf, sector_size, 0)) {
perror("pread failed");
}
}
# g++ test.cc
# ./a # run as adnministrator
pread failed: Illegal seek
Why is that?
cygcheck -s output attached.
Summary: cygwin 3.1.2-1 , Windows 8.1 , all 64 bit
Regards,
David
cygcheck-s
Description: Binary data
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