minix/lib/libc/sys-minix/sizeup.c

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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <minix/u64.h>
#include <sys/types.h>
#include <sys/stat.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>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/type.h>
#include <minix/minlib.h>
#include <minix/partition.h>
#include <sys/ioc_disk.h>
#include <unistd.h>
/*================================================================
* minix_sizeup - determine device size
*===============================================================*/
int minix_sizeup(device, bytes)
char *device;
u64_t *bytes;
{
int fd;
struct part_geom entry;
struct stat st;
if ((fd = open(device, O_RDONLY)) == -1) {
if (errno != ENOENT)
perror("sizeup open");
return -1;
}
if (ioctl(fd, DIOCGETP, &entry) == -1) {
perror("sizeup ioctl");
if(fstat(fd, &st) < 0) {
perror("fstat");
entry.size = ((u64_t)(0));
} else {
entry.size = ((u64_t)(st.st_size));
}
}
close(fd);
*bytes = entry.size;
return 0;
}