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Top Forums Programming A question about printing error message with perror Post 302344249 by dariyoosh on Saturday 15th of August 2009 11:38:06 AM
Old 08-15-2009
Originally Posted by pludi
Did you read up on what perror() does?
Since neither you nor any other function set errno, it's probably defaulted to zero, which means success.

If you want to output any error messages that stem from logical errors, I'd suggest writing them to stderr via fprintf.

Dear pludi

Thank you very much for your help. Your solution solved my problem.

if (argc != 3)
    fprintf(stderr, "use: ./myProgram <source file> <target file>\n");
    return 1;

And it prints only the error message.

Thanks a lot for your help.

Kind Regards,

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PERROR(1)						       MySQL Database System							 PERROR(1)

perror - explain error codes SYNOPSIS
perror [options] errorcode ... DESCRIPTION
For most system errors, MySQL displays, in addition to an internal text message, the system error code in one of the following styles: message ... (errno: #) message ... (Errcode: #) You can find out what the error code means by examining the documentation for your system or by using the perror utility. perror prints a description for a system error code or for a storage engine (table handler) error code. Invoke perror like this: shell> perror [options] errorcode ... Example: shell> perror 13 64 OS error code 13: Permission denied OS error code 64: Machine is not on the network To obtain the error message for a MySQL Cluster error code, invoke perror with the --ndb option: shell> perror --ndb errorcode Note that the meaning of system error messages may be dependent on your operating system. A given error code may mean different things on different operating systems. perror supports the following options. o --help, --info, -I, -? Display a help message and exit. o --ndb Print the error message for a MySQL Cluster error code. o --silent, -s Silent mode. Print only the error message. o --verbose, -v Verbose mode. Print error code and message. This is the default behavior. o --version, -V Display version information and exit. COPYRIGHT
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc. This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This documentation 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 General Public License for more details. You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/. SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/. AUTHOR
Sun Microsystems, Inc. (http://www.mysql.com/). MySQL 5.1 04/06/2010 PERROR(1)

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