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	blkdiscard.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	blkdiscard.c (809B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/ioctl.h>
	3 #include <sys/mount.h>
	4 #include <sys/stat.h>
	5 #include <sys/types.h>
	6
	7 #include <fcntl.h>
	8 #include <stdint.h>
	9 #include <unistd.h>
	10
	11 #include "util.h"
	12
	13 #define OFFSET_IDX 0
	14 #define LENGTH_IDX 1
	15
	16 #define BLKDISCARD _IO(0x12, 119)
	17
	18 static void
	19 usage(void)
	20 {
	21 eprintf("usage: %s device\n", argv0);
	22 }
	23
	24 int
	25 main(int argc, char *argv[])
	26 {
	27 uint64_t range[2];
	28 int fd;
	29
	30 ARGBEGIN {
	31 default:
	32 usage();
	33 } ARGEND
	34
	35 if (argc != 1)
	36 usage();
	37
	38 fd = open(argv[0], O_RDWR);
	39 if (fd < 0)
	40 eprintf("open: %s:", argv[0]);
	41 range[OFFSET_IDX] = 0;
	42 if (ioctl(fd, BLKGETSIZE64, &range[LENGTH_IDX]) < 0)
	43 eprintf("BLKGETSIZE64: %s:", argv[0]);
	44 if (ioctl(fd, BLKDISCARD, range) < 0)
	45 eprintf("BLKDISCARD: %s:", argv[0]);
	46 close(fd);
	47 return 0;
	48 }