COM_ERR
COM_ERR
NAMESYNOPSIS
DESCRIPTION
SEE ALSO
NAME
com_err − common error display routine
SYNOPSIS
#include
<et/com_err.h>
void (*proc) (const char *, long, const char *,
va_list);
void com_err (const char *whoami, long code, const char *format, ...);
proc = set_com_err_hook (proc);
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".
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
