49 lines
809 B
C
49 lines
809 B
C
/* See LICENSE file for copyright and license details. */
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "util.h"
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#define OFFSET_IDX 0
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#define LENGTH_IDX 1
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#define BLKDISCARD _IO(0x12, 119)
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static void
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usage(void)
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{
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eprintf("usage: %s device\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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uint64_t range[2];
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int fd;
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ARGBEGIN {
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default:
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usage();
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} ARGEND
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if (argc != 1)
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usage();
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fd = open(argv[0], O_RDWR);
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if (fd < 0)
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eprintf("open: %s:", argv[0]);
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range[OFFSET_IDX] = 0;
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if (ioctl(fd, BLKGETSIZE64, &range[LENGTH_IDX]) < 0)
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eprintf("BLKGETSIZE64: %s:", argv[0]);
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if (ioctl(fd, BLKDISCARD, range) < 0)
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eprintf("BLKDISCARD: %s:", argv[0]);
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close(fd);
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return 0;
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}
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