minix/commands/devsize/devsize.c

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/* Ben Gras
*
* Based on sizeup() in mkfs.c.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <machine/partition.h>
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#include <minix/partition.h>
#include <sys/ioc_disk.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
unsigned long sizeup(char *);
int main(int argc, char *argv[])
{
if(argc != 2) {
fprintf(stderr, "Usage: %s <device>\n", argv[0]);
return 1;
}
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printf("%lu\n", sizeup(argv[1]));
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return 0;
}
unsigned long sizeup(char *device)
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{
int fd;
struct part_geom entry;
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unsigned long d;
if ((fd = open(device, O_RDONLY)) == -1) {
perror("sizeup open");
exit(1);
}
if (ioctl(fd, DIOCGETP, &entry) == -1) {
perror("sizeup ioctl");
exit(1);
}
close(fd);
d = entry.size / 512;
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return d;
}