Import mknod from ubase

Although mknod is not a POSIX tool, it is widely available on nearly
all UNIX-like systems. It also can be implemented portably apart
from use of the makedev macros, which is already a requirement of
a couple other tools in sbase.

While we're at it, fix a few bugs:
- Include sys/sysmacros.h if makedev was not defined by sys/types.h
- The default mode should respect the user's umask, rather than
  assuming it is 022.
- Clear the umask when -m is specified explicitly so that nodes can
  be created with permissions wider than the user's umask.
- Utilize parsemode from libutil to support symbolic mode strings.
This commit is contained in:
Michael Forney 2020-03-01 15:58:37 -08:00
parent 22921a859f
commit e5d8efb32f
5 changed files with 88 additions and 0 deletions

1
.gitignore vendored
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@ -42,6 +42,7 @@
/md5sum
/mkdir
/mkfifo
/mknod
/mktemp
/mv
/nice

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@ -125,6 +125,7 @@ BIN =\
md5sum\
mkdir\
mkfifo\
mknod\
mktemp\
mv\
nice\

1
README
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@ -84,6 +84,7 @@ The following tools are implemented:
0=*|x md5sum .
0=*|o mkdir .
0=*|o mkfifo .
0=*|x mknod .
0=*|x mktemp .
0=*|o mv (-i)
0=*|o nice .

37
mknod.1 Normal file
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@ -0,0 +1,37 @@
.Dd 2015-02-02
.Dt MKNOD 1
.Os sbase
.Sh NAME
.Nm mknod
.Nd create a special device file
.Sh SYNOPSIS
.Nm
.Op Fl m Ar mode
.Ar name
.Ar type
.Ar major
.Ar minor
.Sh DESCRIPTION
.Nm
creates a special device file named
.Ar name
with major number
.Ar major ,
and minor number
.Ar minor .
.Ar type
specifies what kind of special file will be created and must be one of:
.Bl -tag -width Ds
.It Ar u | c
A character device.
.It Ar b
A block device.
.El
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl m
Set the mode of the new file based on the octal value of
.Ar mode .
.El
.Sh SEE ALSO
.Xr mknod 2

48
mknod.c Normal file
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/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <sys/types.h>
#ifndef makedev
#include <sys/sysmacros.h>
#endif
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-m mode] name type major minor\n", argv0);
}
int
main(int argc, char *argv[])
{
mode_t type, mode = 0666;
dev_t dev;
ARGBEGIN {
case 'm':
mode = parsemode(EARGF(usage()), mode, umask(0));
break;
default:
usage();
} ARGEND;
if (argc != 4)
usage();
if (strlen(argv[1]) != 1 || !strchr("ucb", argv[1][0]))
eprintf("invalid type '%s'\n", argv[1]);
type = (argv[1][0] == 'b') ? S_IFBLK : S_IFCHR;
dev = makedev(estrtonum(argv[2], 0, LLONG_MAX), estrtonum(argv[3], 0, LLONG_MAX));
if (mknod(argv[0], type|mode, dev) == -1)
eprintf("mknod %s:", argv[0]);
return 0;
}