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	Add blkdiscard(8) - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	commit 604b66ae8b4005d89eed1cbab45a64cb57e75390
	parent 4f5837147a14e0fb8ec1a2a46a9c4045bdb75696
	Author: sin <[email protected]>
	Date: Mon, 2 Jul 2018 14:03:49 +0100

	Add blkdiscard(8)

	Diffstat:
	M Makefile \| 1 +
	A blkdiscard.8 \| 12 ++++++++++++
	A blkdiscard.c \| 48 +++++++++++++++++++++++++++++…

	3 files changed, 61 insertions(+), 0 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -37,6 +37,7 @@ LIBUTILSRC = \
	LIB = $(LIBUTIL)

	BIN = \
	+ blkdiscard \
	chvt \
	clear \
	ctrlaltdel \
	diff --git a/blkdiscard.8 b/blkdiscard.8
	@@ -0,0 +1,12 @@
	+.Dd July 2, 2018
	+.Dt BLKDISCARD 8
	+.Os ubase
	+.Sh NAME
	+.Nm blkdiscard
	+.Nd discard sectors on a device
	+.Sh SYNOPSIS
	+.Nm
	+.Ar device
	+.Sh DESCRIPTION
	+.Nm
	+is used to discard all device sectors on solid-state devices.
	diff --git a/blkdiscard.c b/blkdiscard.c
	@@ -0,0 +1,48 @@
	+/* See LICENSE file for copyright and license details. */
	+#include <sys/ioctl.h>
	+#include <sys/mount.h>
	+#include <sys/stat.h>
	+#include <sys/types.h>
	+
	+#include <fcntl.h>
	+#include <stdint.h>
	+#include <unistd.h>
	+
	+#include "util.h"
	+
	+#define OFFSET_IDX 0
	+#define LENGTH_IDX 1
	+
	+#define BLKDISCARD _IO(0x12, 119)
	+
	+static void
	+usage(void)
	+{
	+ eprintf("usage: %s device\n", argv0);
	+}
	+
	+int
	+main(int argc, char *argv[])
	+{
	+ uint64_t range[2];
	+ int fd;
	+
	+ ARGBEGIN {
	+ default:
	+ usage();
	+ } ARGEND
	+
	+ if (argc != 1)
	+ usage();
	+
	+ fd = open(argv[0], O_RDWR);
	+ if (fd < 0)
	+ eprintf("open: %s:", argv[0]);
	+ range[OFFSET_IDX] = 0;
	+ if (ioctl(fd, BLKGETSIZE64, &range[LENGTH_IDX]) < 0)
	+ eprintf("BLKGETSIZE64: %s:", argv[0]);
	+ if (ioctl(fd, BLKDISCARD, range) < 0)
	+ eprintf("BLKDISCARD: %s:", argv[0]);
	+ close(fd);
	+ return 0;
	+}