58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "blkdev.h"
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#include "wholedisk.h"
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int is_whole_disk_fd(int fd, const char *name)
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{
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#ifdef HDIO_GETGEO
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if (fd != -1) {
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struct hd_geometry geometry;
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int i = ioctl(fd, HDIO_GETGEO, &geometry);
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if (i == 0)
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return geometry.start == 0;
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}
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#endif
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/*
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* The "silly heuristic" is still sexy for us, because
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* for example Xen doesn't implement HDIO_GETGEO for virtual
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* block devices (/dev/xvda).
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*
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* -- kzak@redhat.com (23-Feb-2006)
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*/
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while (*name)
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name++;
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return !isdigit(name[-1]);
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}
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int is_whole_disk(const char *name)
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{
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int fd = -1, res = 0;
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#ifdef HDIO_GETGEO
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fd = open(name, O_RDONLY);
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if (fd != -1)
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#endif
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res = is_whole_disk_fd(fd, name);
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if (fd != -1)
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close(fd);
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return res;
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}
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#ifdef TEST_PROGRAM
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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fprintf(stderr, "usage: %s <device>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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printf("%s: is%s whole disk\n", argv[1],
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is_whole_disk(argv[1]) ? "" : " NOT");
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exit(EXIT_SUCCESS);
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}
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#endif
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