Fellow hackers,
I'm not sure if I'm trying something impossible here. I want to find the
size in bytes of a disk special device, eg /dev/da0, /dev/da0s1,
/dev/da0s1a, /dev/vinum/usr and so on. The following program prints
correct sizes for plain files and directories, but it consistently
prints 0 for block devices. If this is not supported, how would I find
the number of blocks for a given block device? I don't want to mess with
parsing disklabels and vinum configs...
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
int main (int argc, char **argv)
{
int fd;
off_t len;
if (argc != 2)
return 1;
if ((fd = open (argv[1], O_RDONLY)) < 0) {
perror (argv[1]);
return 1;
}
if ((len = lseek (fd, 0, SEEK_END)) == -1) {
perror ("lseek");
return 1;
}
printf ("%lld\n", (long long)len);
close (fd);
return 0;
}
Regards,
Jens
--
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)
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