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Utilities: Add blockdev utility

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This new utility queries a block device for its size via the newly
introduced ioctl STORAGE_DEVICE_GET_SIZE request.
This commit is contained in:
David Isaksson 2021-10-08 22:15:07 +02:00 committed by Andreas Kling
parent 3b089032f4
commit 8d631dcd5e
Notes: sideshowbarker 2024-07-18 02:54:08 +09:00 
Author: https://github.com/Granddave
Commit: https://github.com/SerenityOS/serenity/commit/8d631dcd5ec
Pull-request: https://github.com/SerenityOS/serenity/pull/10401
Reviewed-by: https://github.com/supercomputer7
1 changed files with 61 additions and 0 deletions
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Userland/Utilities/blockdev.cpp Normal file
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/*
* Copyright (c) 2021, David Isaksson <davidisaksson93@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
static void fetch_ioctl(int fd, int request)
{
size_t value;
if (ioctl(fd, request, &value) < 0) {
perror("ioctl");
exit(1);
}
outln("{}", value);
}
int main(int argc, char** argv)
{
if (unveil("/dev", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil(nullptr, nullptr) < 0) {
perror("unveil");
return 1;
}
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
const char* device = nullptr;
bool flag_get_disk_size = false;
Core::ArgsParser args_parser;
args_parser.set_general_help("Call block device ioctls");
args_parser.add_option(flag_get_disk_size, "Get size in bytes", "size", 's');
args_parser.add_positional_argument(device, "Device to query", "device");
args_parser.parse(argc, argv);
int fd = open(device, O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
if (flag_get_disk_size) {
fetch_ioctl(fd, STORAGE_DEVICE_GET_SIZE);
}
return 0;
}