/usr/share/calc/help/errno is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | NAME
errno - return or set a stored error-number
SYNOPSIS
errno([errnum])
TYPES
errnum integer, 0 <= errnum <= 32767
return integer
DESCRIPTION
Whenever an operation or evaluation of function returns an error-value,
the numerical code for that value is stored as calc_errno.
errno() returns the current value of calc_errno.
errno(errnum) sets calc_errno to the value errnum and returns its
previous value.
To detect whether an error occurs during some sequence of operations,
one may immediately before that sequence set the stored error-number
to zero by errno(0), and then after the operations, whether or not
an error has occurred will be indicated by errno() being nonzero or
zero. If a non-zero value is returned, that value will be the code
for the most recent error encountered.
The default argument for the functions error() and strerror() is the
currently stored error-number; in particular, if no error-value has
been returned after the last errno(0), strerror() will return
"No error".
EXAMPLE
Assuming there is no file with name "not_a_file"
; errno(0)
0
; errmax(errcount()+4)
20
; badfile = fopen("not_a_file", "r")
; print errno(), error(), strerror()
2 System error 2 No such file or directory
; a = 1/0
; print errno(), error(), strerror()
10001 Error 10001 Division by zero
LIMITS
none
LINK LIBRARY
none
SEE ALSO
errmax, errcount, error, strerror, iserror, newerror, errorcodes,
stoponerror
## Copyright (C) 1999-2006 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: errno,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/errno,v $
##
## Under source code control: 1994/10/27 03:05:08
## File existed as early as: 1994
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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