Gnu Error Reporting
Contents |
you open an input file,
Perror Example
you should verify that the file was actually opened correctly, and print an error message or take other appropriate action errno if the call to the library function failed. This chapter describes how the error reporting facility works. Your program should include the header file errno.h to use this facility. • Checking for Errors:How errors are reported by library functions. • Error Codes:Error code macros; all of these expand into integer constant values. • Error Messages:Mapping error codes onto error messages.
of a library call. The functions strerror and perror give you the standard error message for a given error code; the variable program_invocation_short_name gives c exit you convenient access to the name of the program that encountered the error reporting -1 php error. Function: char * strerror (int errnum) Preliminary: | MT-Unsafe race:strerror | AS-Unsafe heap i18n | AC-Unsafe mem | See POSIX Safety Concepts. The strerror function maps the error code (see Checking for Errors) specified by the errnum argument to a descriptive error message string. The return value is http://www.gnu.org/s/libc/manual/html_node/Error-Reporting.html a pointer to this string. The value errnum normally comes from the variable errno. You should not modify the string returned by strerror. Also, if you make subsequent calls to strerror, the string might be overwritten. (But it’s guaranteed that no library function ever calls strerror behind your back.) The function strerror is declared in string.h. Function: char * strerror_r (int errnum, http://www.gnu.org/s/libc/manual/html_node/Error-Messages.html char *buf, size_t n) Preliminary: | MT-Safe | AS-Unsafe i18n | AC-Unsafe | See POSIX Safety Concepts. The strerror_r function works like strerror but instead of returning the error message in a statically allocated buffer shared by all threads in the process, it returns a private copy for the thread. This might be either some permanent global data or a message string in the user supplied buffer starting at buf with the length of n bytes. At most n characters are written (including the NUL byte) so it is up to the user to select a buffer large enough. This function should always be used in multi-threaded programs since there is no way to guarantee the string returned by strerror really belongs to the last call of the current thread. The function strerror_r is a GNU extension and it is declared in string.h. Function: void perror (const char *message) Preliminary: | MT-Safe race:stderr | AS-Unsafe corrupt i18n heap lock | AC-Unsafe corrupt lock mem fd | See POSIX Safety Concepts. This function prints an error message to the stream stderr; see Stan
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers https://askubuntu.com/questions/682277/error-reporting-wizard-does-not-work/684135 to any questions you might have Meta Discuss the workings and http://archive.oreilly.com/pub/a/linux/excerpts/9780596155971/error-reporting-recovery.html policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site error reporting for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Error reporting wizard does not work up vote 2 down vote favorite In Kubuntu 15.04 gnu error reporting the K-Menu (application starter) keeps crashing multiple times each day. I would like to report the bug using the corresponding wizard but it does not work. The wizard tells me that the report would be useless without installing debugging packages for additional information und refuses to send a report (even if I agree to input manual explanations). Anyway installing the debug packages does not work. It tells me it couldn't find the packages. Installing kdelibs5-dbg (as suggested here) didn't change the behaviour. Any ideas how to fix the error reporting wizard? Which packages do I need to install so the wizard is satisfied? UPDATE: There is a link in the wizard I didn't notice. It lists some files: /usr/bin/plasmashell /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 How can I get the package names corresponding to those files? UPDATE2: Just reproduced the issue again. This time an additional file /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/kicker/libkickerplugin.so appeared in the list. But the important part is: This
Linux or Unix, this useful book explains how to use flex and bison to solve your problems quickly. flex & bison is the long-awaited sequel to the classic O'Reilly book, lex & yacc. In the nearly two decades since the original book was published, the flex and bison utilities have proven to be more reliable and more powerful than the original Unix tools. flex & bison covers the same core functionality vital to Linux and Unix program development, along with several important new topics. You'll find revised tutorials for novices and references for advanced users, as well as an explanation of each utility's basic usage and simple, standalone applications you can create with them. With flex & bison, you'll discover the wide range of uses these flexible tools offer. The previous chapters discussed techniques for finding errors within bison grammars. In this chapter, we turn our attention to the other side of error detection--how the parser and lexical analyzer detect errors. This chapter presents some techniques to incorporate error detection and reporting into a parser. We'll make a modified version of the SQL parser from Parsing SQL that demonstrates them.Bison provides the error token and the yyerror() routine, which are typically sufficient for early versions of a tool. However, as any program begins to mature, especially a programming tool, it becomes important to provide better error recovery, which allows for detection of errors in later portions of the file, and to provide better error reporting. Error ReportingError reporting should give as much detail about the error as possible. The default bison error declares only that it found a syntax error and stops parsing. In our examples, we used yylineno to report the line number. This provides the location of the error but does not report any other errors within the file or where in the specified line the error occurs. The bison locations feature, described later in this chapter, is an easy way to pinpoint the location of an error, down to the exact line and character numbers. In our example, we pri