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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
inline constexpr unsigned encoded_device(unsigned major, unsigned minor)
{
return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
}
static int usage()
{
printf("usage: mknod <name> <c|b|p> <major> <minor>\n");
return 0;
}
int main(int argc, char** argv)
{
// FIXME: When invoked with type "p", no need for major/minor numbers.
// FIXME: Add some kind of option for specifying the file permissions.
if (argc != 5)
return usage();
const char* name = argv[1];
mode_t mode = 0666;
switch (argv[2][0]) {
case 'c':
case 'u':
mode |= S_IFCHR;
break;
case 'b':
mode |= S_IFBLK;
break;
case 'p':
mode |= S_IFIFO;
break;
default:
return usage();
}
int major = atoi(argv[3]);
int minor = atoi(argv[4]);
int rc = mknod(name, mode, encoded_device(major, minor));
if (rc < 0) {
perror("mknod");
return 1;
}
return 0;
}
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