Sponsored Content
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
Quote:
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.

Code:
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,
Smilie
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

“Ostream” object is not printing message on HP-UNIX for debug mode

The following C++ code segment is not working in debug mode build on HP-UNIX machine. It is not printing "Hello World" message on the screen. While it is working fine in release mode build. ============================================== class KLogStreamBuf : public streambuf { public:... (0 Replies)
Discussion started by: heena
0 Replies

2. Solaris

Error message printing to Windows on port 515

Hello, We have an application which runs on Windows 2000 that responds to prrint requests by anyone using RFC1179 protocol on port 515. We are getting an error message when submitting print requests from Sun Solaris 9. "Windows 2000 LPD Server Error: Specified printer does not exist"... (0 Replies)
Discussion started by: pauls
0 Replies

3. Programming

does perror() set errno?

here the program gives a odd result: #include <stdio.h> int main(){ perror("first"); perror("next"); return 0; } result: first: Success next: Illegal seek why? any resonable explanation? i found no information about this in man pages. thanks in advance (2 Replies)
Discussion started by: ebd
2 Replies

4. Shell Programming and Scripting

shell script, why isn't if printing message?

Why isn't printing message? 1 #!/bin/sh 2 3 something(){ 4 echo "Inside something" 5 echo $1 $2 6 } 7 val=$(something "Hello " "world") But it prints. 1 #!/bin/sh 2 3 something(){ 4 echo "Inside something" 5 echo $1 $2 6 } 7... (4 Replies)
Discussion started by: cola
4 Replies

5. Post Here to Contact Site Administrators and Moderators

Message Editor question

Hia, this is a very low priority request, but I am slightly annoyed by the behaviour of the tags in the message editor. They behave assymetric in the sense that the opening tag is introducing an empty line, and the closing tag is not, and can't be convinced to do otherwise. I know I am... (1 Reply)
Discussion started by: Andre_Merzky
1 Replies

6. UNIX for Dummies Questions & Answers

perror with signals

I have following problem with this code.. First time trough the main loop..... perror gives ....blocked signal:success(all other times gives illlegal seek) Should every time trought the main loop be success?? And the perror otside of main loop...didn't change mask:success That line of code... (2 Replies)
Discussion started by: joker40
2 Replies

7. Programming

help with C programming, perror

i am trying to use the perror function: something like perror("WRONG!!!"); but when i see the message in the terminal, it comes out like WRONG!!! : Success How can i change it to WRONG!!! : WRONG!!! well i just want to have my own custom message for the part after the colon... (1 Reply)
Discussion started by: omega666
1 Replies

8. Shell Programming and Scripting

Printing all lines before a specific string and a custom message 2 lines after

Hello all, I need to print all the lines before a specific string and print a custom message 2 lines after that. So far I have managed to print everything up the string, inclusively, but I can't figure out how to print the 2 lines after that and the custom message. My code thus far is:... (4 Replies)
Discussion started by: SEinT
4 Replies

9. Shell Programming and Scripting

Printing a message in file without opening it in perl

Hello friends, i have a perl script as below ... for (0 ..$#values) { ##want to print some message here in Report.txt file print `find /abc/xyz/pqr/$values" -type f -ls` >> Report.txt } I am able to get output of print `find /abc/xyz/pqr/$values" -type f -ls` >> Report.txt in... (2 Replies)
Discussion started by: harpal singh
2 Replies

10. Solaris

Display Message Question

I'm have a script that I am creating and I want the dmesg command to only show output for the current day and the day before. What would be the command to make this work? Thanks (8 Replies)
Discussion started by: MattyJ2009
8 Replies
PERROR(1)						       MySQL Database System							 PERROR(1)

NAME
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)

Featured Tech Videos

All times are GMT -4. The time now is 02:24 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy