A question about printing error message with perror
Dear all,
I use perror in order to print an error message to the standar error. For example
if a C program is called without its two necessary command line parameters
then :
What I don't understand is why there is a second line: ":Success"??
Is there a way to remove it? as I want to print an error message, it doesn't
really make sense to print Success.
Thanks in advance,
Kind Regards,
Last edited by dariyoosh; 08-15-2009 at 07:37 AM..
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)
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)
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)
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)
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)
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)
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)
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)
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
LEARN ABOUT DEBIAN
set_progname
ERRORMSG(3pub)ERRORMSG(3pub)NAME
errormsg, set_progname, get_progname - printing error messages
SYNOPSIS
#include <errormsg.h>
void errormsg(int exitp, int eno, const char *fmt, ...);
void set_progname(const char *argv0, const char *def);
const char *get_progname(void);
DESCRIPTION
The errormsg function is used for printing error messages. It is a like a combination of fprintf(3) and perror(3), in that it makes it
easy to add arbitrary, printf-like formatted text to the output, and makes it easy to include the system's error message (the error string
corresponding to the eno parameter). Unlike perror, this function does not get the error code directly from errno, thus making it easier
to do something else that might set it before printing out the error message. errormsg also adds the name of the program to the output, if
known.
The first argument to errormsg should be 0 (don't exit program), 1 (exit program with exit(EXIT_FAILURE)) or 2 (with abort()). The second
one should be 0 (don't print system error message), positive (print error message corresponding to the error code), or -1 (print the error
message corresponding to errno).
The set_progname function sets the program name. You need to call this function with at least one non-NULL parameter to get the program
names included in the output. If either argument is non-NULL, it should point at strings that have static duration, i.e. they exist until
the program terminates (or at least until the last error message has been printed); this is so that it is not necessary to create a copy of
the name. (Either or both arguments can also be NULL.)
If the first argument is non-NULL, that is used as the name, otherwise the seconds argument is used. If both are NULL, no program name is
included in the output. The reason for having two arguments is so that the caller doesn't have to do the test, and can just call
set_progname(argv[0], "default_name");
(it is valid for argv[0] to be NULL, under ISO C).
The get_progname function returns a pointer to the current name of the program, as set by set_progname. If get_progname returns NULL, then
no name has been set and none is included in the output. This function is included for completeness, it is not really expected to be use-
ful.
SEE ALSO publib(3)AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)
ERRORMSG(3pub)
08-15-2009
A question about printing error message with perror
