Advanced UNIX Programming by Warren W Gay

By Warren W Gay

Complicated UNIX Programming is going past the basics of UNIX programming and provides details and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this publication builds at the talents and data the reader already possesses. It comprises insurance of web tactics, interprocess keep an eye on, dossier procedure manipulation, synchronization, and masses extra.

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Meaningful error messages can be reported by a UNIX program to the user, in the following ways: • • • Use the perror(3) function to generate a message from the errno value and report it to stderr. Use the provided sys_errlist[] array of messages (on FreeBSD this is described by the man page strerror(3)). Use the strerror(3) function to return a message for the error code provided in the function argument. Using the perror(3) Function One function provided for reporting errors is the library function perror(3).

However, the situation may not be so clear in other circumstances, which will be examined next. h> int ferror(FILE *stream); error */ void clearerr(FILE *stream); indication */ /* Test stream for an /* Clear an error The ferror(3) function returns a non-zero value (a logical True) when an error has occurred at some point on the FILE stream identified by the argument stream. This indicator remains True until the function clearerr(3) is called for the same stream. This in itself is not a problem.

For this reason, the best programming practice is for the programmer to test for failure indication upon return from a function. Anything that does not classify as a failure should be considered a successful indication. Other Return Indications Before leaving the topic of function return indications, it is worth pointing out that some functions offer a third indication, in addition to the normal success or failure. These generally fall into two categories: • • No more information exists (examples include waitpid(2), wait3(2), wait(4)).

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