Add blkdiscard(8) - ubase - suckless linux base utils
HTML git clone git://git.suckless.org/ubase
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 604b66ae8b4005d89eed1cbab45a64cb57e75390
DIR parent 4f5837147a14e0fb8ec1a2a46a9c4045bdb75696
HTML Author: sin <sin@2f30.org>
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(-)
---
DIR diff --git a/Makefile b/Makefile
@@ -37,6 +37,7 @@ LIBUTILSRC = \
LIB = $(LIBUTIL)
BIN = \
+ blkdiscard \
chvt \
clear \
ctrlaltdel \
DIR 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.
DIR 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;
+}