1Unix::Mknod(3) User Contributed Perl Documentation Unix::Mknod(3)
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6 Unix::Mknod - Perl extension for mknod, major, minor, and makedev
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9 use Unix::Mknod qw(:all);
10 use File::stat;
11 use Fcntl qw(:mode);
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13 $st=stat('/dev/null');
14 $major=major($st->rdev);
15 $minor=minor($st->rdev);
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17 mknod('/tmp/special', S_IFCHR|0600, makedev($major,$minor+1));
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20 This module allows access to the device routines
21 major()/minor()/makedev() that may or may not be macros in .h files.
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23 It also allows access to the mknod(2) system call.
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26 mknod($filename, $mode, $rdev)
27 Creates a block or character device special file named $filename.
28 Must be run as a privileged user, usually root. Returns 0 on
29 success and -1 on failure, like "POSIX::mkfifo" does.
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31 $major = major($rdev)
32 Returns the major number for the device special file as defined by
33 the st_rdev field from the stat(3) call.
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35 $minor = minor($rdev)
36 Returns the minor number for the device special file as defined by
37 the st_rdev field from the stat(3) call.
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39 $rdev = makedev($major, $minor)
40 Returns the st_rdev number for the device special file from the
41 $major and $minor numbers.
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44 There are 2 other perl modules that implement the mknod(2) system call,
45 but they have problems working on some platforms. "Sys::Mknod" does
46 not work on AIX because it uses the syscall(2) generic system call
47 which AIX does not have. "Mknod" implements S_IFIFO, which on most
48 platforms is not implemented in mknod(1), but rather mkfifo(1) (which
49 is implemented in POSIX perl module).
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51 The perl module "File::Stat::Bits" also implements major() and minor()
52 (and a version of makedev() called dev_join). They are done as a
53 program to get the bit masks at compile time, but if major() and
54 minor() are implemented as sub routines, the arugment could be
55 something as simple as an index to a lookup table (and thereby having
56 no decernable relation to its result).
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59 Running "make test" as non root will not truly test the functions, as
60 in most UNIX like OSes, mknod(2) needs to be invoked by a privelaged
61 user, usually root.
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64 $ERRNO or $! for the specific error message.
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66 File::Stat::Bits, Mknod, POSIX, Sys::Mknod
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68 major(9), minor(9), mkfifo(1), mknod(8)
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70 ftp://ftp-dev.cites.uiuc.edu/pub/Unix-Mknod
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73 Jim Pirzyk, <pirzyk@uiuc.edu>
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76 Copyright (c) 2005-2008 University of Illinois Board of Trustees All
77 rights reserved.
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79 Developed by: Campus Information Technologies and Educational Services,
80 University of Illinois at Urbana-Champaign
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82 Permission is hereby granted, free of charge, to any person obtaining a
83 copy of this software and associated documentation files (the
84 ``Software''), to deal with the Software without restriction, including
85 without limitation the rights to use, copy, modify, merge, publish,
86 distribute, sublicense, and/or sell copies of the Software, and to
87 permit persons to whom the Software is furnished to do so, subject to
88 the following conditions:
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90 * Redistributions of source code must retain the above copyright
91 notice, this list of conditions and the following disclaimers.
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93 * Redistributions in binary form must reproduce the above copyright
94 notice, this list of conditions and the following disclaimers in the
95 documentation and/or other materials provided with the distribution.
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97 * Neither the names of Campus Information Technologies and Educational
98 Services, University of Illinois at Urbana-Champaign, nor the names
99 of its contributors may be used to endorse or promote products
100 derived
101 from this Software without specific prior written permission.
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103 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
104 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
105 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
106 IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
107 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
108 CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
109 THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
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113perl v5.38.0 2023-07-21 Unix::Mknod(3)