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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Written by Karel Zak <kzak@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "blkdev.h"
#include "wholedisk.h"
int is_whole_disk_fd(int fd, const char *name)
{
#ifdef HDIO_GETGEO
if (fd != -1) {
struct hd_geometry geometry;
int i = ioctl(fd, HDIO_GETGEO, &geometry);
if (i == 0)
return geometry.start == 0;
}
#endif
/*
* The "silly heuristic" is still sexy for us, because
* for example Xen doesn't implement HDIO_GETGEO for virtual
* block devices (/dev/xvda).
*
* -- kzak@redhat.com (23-Feb-2006)
*/
while (*name)
name++;
return !isdigit(name[-1]);
}
int is_whole_disk(const char *name)
{
int fd = -1, res = 0;
#ifdef HDIO_GETGEO
fd = open(name, O_RDONLY|O_CLOEXEC);
if (fd != -1)
#endif
res = is_whole_disk_fd(fd, name);
if (fd != -1)
close(fd);
return res;
}
#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
if (argc < 2) {
fprintf(stderr, "usage: %s <device>\n", argv[0]);
exit(EXIT_FAILURE);
}
printf("%s: is%s whole disk\n", argv[1],
is_whole_disk(argv[1]) ? "" : " NOT");
exit(EXIT_SUCCESS);
}
#endif
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