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a number of (ex-)Athena programs. Breaking my own rules for importing somewhat, as this code does not appear to be actively maintained by anyone (not that it really needs it).
97 lines
2.4 KiB
Groff
97 lines
2.4 KiB
Groff
.\" Copyright (c) 1988 Massachusetts Institute of Technology,
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.\" Student Information Processing Board. All rights reserved.
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.\"
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.\" $Header$
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.\"
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.TH COM_ERR 3 "22 Nov 1988" SIPB
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.SH NAME
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com_err \- common error display routine
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.SH SYNOPSIS
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.nf
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#include <com_err.h>
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.PP
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void com_err (whoami, code, format, ...);
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const char *whoami;
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long code;
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const char *format;
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.PP
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proc = set_com_err_hook (proc);
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.fi
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void (*
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.I proc
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) (const char *, long, const char *, va_list);
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.nf
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.PP
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proc = reset_com_err_hook ();
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.PP
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void initialize_XXXX_error_table ();
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.fi
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.SH DESCRIPTION
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.I Com_err
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displays an error message on the standard error stream
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.I stderr
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(see
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.IR stdio (3S))
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composed of the
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.I whoami
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string, which should specify the program name or some subportion of
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a program, followed by an error message generated from the
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.I code
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value (derived from
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.IR compile_et (1)),
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and a string produced using the
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.I format
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string and any following arguments, in the same style as
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.IR fprintf (3).
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The behavior of
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.I com_err
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can be modified using
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.I set_com_err_hook;
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this defines a procedure which is called with the arguments passed to
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.I com_err,
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instead of the default internal procedure which sends the formatted
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text to error output. Thus the error messages from a program can all
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easily be diverted to another form of diagnostic logging, such as
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.IR syslog (3).
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.I Reset_com_err_hook
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may be used to restore the behavior of
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.I com_err
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to its default form. Both procedures return the previous ``hook''
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value. These ``hook'' procedures must have the declaration given for
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.I proc
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above in the synopsis.
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The
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.I initialize_XXXX_error_table
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routine is generated mechanically by
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.IR compile_et (1)
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from a source file containing names and associated strings. Each
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table has a name of up to four characters, which is used in place of
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the
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.B XXXX
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in the name of the routine. These routines should be called before
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any of the corresponding error codes are used, so that the
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.I com_err
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library will recognize error codes from these tables when they are
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used.
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The
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.B com_err.h
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header file should be included in any source file that uses routines
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from the
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.I com_err
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library; executable files must be linked using
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.I ``-lcom_err''
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in order to cause the
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.I com_err
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library to be included.
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.\" .IR for manual entries
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.\" .PP for paragraph breaks
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.SH "SEE ALSO"
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compile_et (1), syslog (3).
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Ken Raeburn, "A Common Error Description Library for UNIX".
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