com_err man page on OpenBSD

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COM_ERR(3)							    COM_ERR(3)

NAME
       com_err - common error display routine

SYNOPSIS
	#include <com_err.h>

       void com_err (whoami, code, format, ...);
	    const char *whoami;
	    long code;
	    const char *format;

       proc = set_com_err_hook (proc);
       void (* proc ) (const char *, long, const char *, va_list);

       proc = reset_com_err_hook ();

       void initialize_XXXX_error_table ();

DESCRIPTION
       Com_err displays an error message on the standard error stream stderr
       (see stdio(3S)) composed of the whoami string, which should specify the
       program name or some subportion of a program, followed by an error
       message generated from the code value (derived from compile_et(1)), and
       a string produced using the format string and any following arguments,
       in the same style as fprintf(3).

       The behavior of com_err can be modified using set_com_err_hook; this
       defines a procedure which is called with the arguments passed to
       com_err, instead of the default internal procedure which sends the
       formatted text to error output.	Thus the error messages from a program
       can all easily be diverted to another form of diagnostic logging, such
       as syslog(3). Reset_com_err_hook may be used to restore the behavior of
       com_err to its default form.  Both procedures return the previous
       ``hook'' value.	These ``hook'' procedures must have the declaration
       given for proc above in the synopsis.

       The initialize_XXXX_error_table routine is generated mechanically by
       compile_et(1) from a source file containing names and associated
       strings.	 Each table has a name of up to four characters, which is used
       in place of the XXXX in the name of the routine.	 These routines should
       be called before any of the corresponding error codes are used, so that
       the com_err library will recognize error codes from these tables when
       they are used.

       The com_err.h header file should be included in any source file that
       uses routines from the com_err library; executable files must be linked
       using ``-lcom_err'' in order to cause the com_err library to be
       included.

SEE ALSO
       compile_et (1), syslog (3).

       Ken Raeburn, "A Common Error Description Library for UNIX".

SIPB								   22 Nov 1988
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