Home > Linux Error > How To Print Errno In C

How To Print Errno In C

Contents

Not the answer you're looking for? This is a different command than the echo you're using, but serves a similar purpose. Use strerror_r if you need to worry about that. #include void perror(const char *s); /* you can think of it as being implemented like this: */ void perror(const char *s) Please use the new version at LinuxCommand.org LinuxCommand Learningtheshell Writingshellscripts Script library SuperMan pages Who, What, Where, Why Tips, News And Rants Previous | Contents | Next Errors and Signals and http://robertwindows.com/linux-error/errno-eafnosupport.html

Redirecting both You can even redirect both channels at the same time using both symbols on the command line. Why were people led to believe that the Apollo mission was fake in Interstellar? All Aboard the Kolmogorov Complexity Train Is it worth sending a manned mission to a black hole? Link Felix Frank October 21, 2010, 8:16 am Hi, good thinking, but this article desperately lacks a reference to perror.

How To Print Errno In C

Does using documentation as a developer make me look unprofessional? and change it to LogLevel debug, save the file. Copy this file to your home directory: $sudocp/var/spool/cups/d...~/appout $sudochmod777~/appout Re-enable the print queue: $cupsenable If the file gets printed correctly now, try the above procedure with another file, we need a Can someone take my Wi-Fi signal DOWN?

Do handstand push-ups hit all the three shoulder heads? In general, you could use the perror function to print a human readable string. Example text/html; /usr/bin/sensible-browser '%s'; description=HTML Text; nametemplate=%s.html application/x-troff-man; /usr/bin/nroff -mandoc -Tutf8; copiousoutput; print=/usr/bin/nroff -mandoc -Tutf8 | print text/plain:- application/x-ogg; /usr/bin/mplayer '%s'; description="OggVorbis Audio" application/ogg; /usr/bin/mplayer '%s'; description="OggVorbis Audio" audio/mpeg; /usr/bin/mplayer '%s'; Man Strerror After that, please restore the original script again with $sudomv/etc/init/cups.conf{.orig,} If the CUPS daemon did not start ("lpstat -r" says "scheduler is not running") follow the instructions under "CUPS error_log" on

Scan or photograph the printout if it is not correct and attach the images to the bug report. share|improve this answer answered Nov 6 at 0:47 carefulnow 341116 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up Wait around 15 seconds for the network scan (spinning icon must disappear). http://beej.us/guide/bgnet/output/html/multipage/perrorman.html I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web.

Is space piracy orbitally practical? Errno Bad Address your complete shell script with multiple echo statements } > 2>&1 | tee -a script.log Reply Link aref ghobadi August 15, 2015, 9:56 amHi thanks a lot Reply Link karthikeyan December Who is the tallest? You really need to know what error number 17 means.

Perror Example

If your printer is connected via USB try the following steps to find out whether such exception rules could solve your problem: Does your printer also allow to be connected via here I like to include the name of the program in the error message to make clear where the error is coming from. How To Print Errno In C Why didn't Hans Gruber know what Mr. Perror Errno The idea is, that the regular output of the application goes to the Output channel, and all the warnings and error messages go to the Error channel.

Aborting." 1>&2 exit 1 fi Here we check to see if the cd command is successful. The main use of this is when there is a program and the user wants to throw away either the regular output or the error messages. It produces a text file with a lot of useful information to attach to bug reports. To change the printer's configuration either use the printer's front panel menus or the printer's web configuration interface. Strerror Example

Privacy - Terms of Service - Questions or Comments <> 9.16. UNIX is a registered trademark of The Open Group. share|improve this answer edited Feb 17 '15 at 23:56 Peter Mortensen 10.4k1372108 answered Feb 2 '09 at 16:51 Johannes Weiß 29.9k867108 add a comment| up vote 1 down vote It means: his comment is here The largest message number provided in the table is sys_nerr-1.

If you're interested in learning more about mime-types or mailcap see the following references. What Is "errno" Thanks a lot. –Adrien Clerc Jul 20 at 9:46 add a comment| up vote 2 down vote Call perror("execl"); in case of error. This makes Turboprint using the current version of Ghostscript as shipped with Ubuntu, containing all the latest bug fixes.

Much easier that other methods mentioned by previous posters.

share|improve this answer edited Feb 18 '15 at 0:09 Peter Mortensen 10.4k1372108 answered Feb 2 '09 at 16:50 dsm 8,3932963 1 I hate how the unix documentation don't associate constant Run $ifconfig $route to check general network health. Getting the data which would go to the printer Another important piece of data for debugging printing problems is the data which is supposed to be sent to the printer. Strerror Was Not Declared In This Scope Run the command $cupsctlLogDebugHistory=999999 for practically unlimited logging of failed jobs.

The global error list sys_errlist[] indexed by errno can be used to obtain the error message without the newline. Attach the error_log, as described in the section "CUPS error_log" on this page. Or go to "System Settings" in the launcher and click on "Printing". Attach the data which the printer receives (section "Getting the data which would go to the printer" on this page) Examine the file obtained in the previous step by running the

But if you do that, it can fill your disk quickly. Tweet >Add your comment If you enjoyed this article, you might also like.. 50 Linux Sysadmin Tutorials 50 Most Frequently Used Linux Commands (With Examples) Top 25 Best Linux Performance share|improve this answer edited Feb 18 '15 at 0:07 Peter Mortensen 10.4k1372108 answered Feb 2 '09 at 16:50 Otávio Décio 54.8k9125191 add a comment| up vote 0 down vote When you Mark the stopped job in the integrated job viewer, click "No" at the question and then "Forward".

This means any print operation that was not told specifically where to print, will be printed to STDOUT. Sending HTML e-mail using Email::Stuffer Perl/CGI script with Apache2 JSON in Perl Simple Database access using Perl DBI and SQL Reading from LDAP in Perl using Net::LDAP Common warnings and error It's not, if nothing goes wrong. The use of sys_errlist[] is nowadays deprecated.

Make sure to bookmark this article for future reference. For example: #include #include /* ... */ if(read(fd, buf, 1)==-1) { printf("Oh dear, something went wrong with read()! %s\n", strerror(errno)); } Linux also supports the explicitly-threadsafe variant strerror_r(). In multithreaded programs it is a macro executing a function that returns the last error of the caller thread. And came to know that it is used to find the correct program to open a file with, based on MIME.

He likes to write automated tests and refactor code. Attach the output of the above commands to the bug report. First (if s is not NULL and *s is not a null byte ('\0')) the argument string s is printed, followed by a colon and a blank. The following table shows list of error numbers and its descriptions in Linux operation system ERROR CODE TABLE Error number Error Code Error Description 1 EPERM Operation not permitted 2 ENOENT

PROGNAME=$(basename $0) function error_exit { # ---------------------------------------------------------------- # Function for exit due to fatal program error # Accepts 1 argument: # string containing descriptive error message # ---------------------------------------------------------------- echo "${PROGNAME}: ${1:-"Unknown This gives information about the IP address of the printer and about the protocols it supports (JetDirect/AppSocket, LPD, IPP, SMB/Windows, ...). That is, the program's ability to handle situations in which something goes wrong. also to set permanent, # export print='echo' # print Hello Linux Hello Linux so, # export | grep print declare -x print="echo" # unset print < -- to revert. # export

The numbers must be supplied with three digits, zero-padded from the left, like "008:015". (More information from http://hplipopensource.com/.) Find out if your printer gets detected by CUPS: $lpinfo-v Attach the output Join them; it only takes a minute: Sign up How to know what the 'errno' means? There it only appears if you move the mouse into the top bar. Make sure the desired protocols and DNS-SD/mDNS/BonJour support are active in the printer's hardware configuration.