By Warren W Gay
Complicated UNIX Programming is going past the basics of UNIX programming and provides info 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 net approaches, interprocess keep an eye on, dossier approach manipulation, synchronization, and lots more and plenty extra.
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Extra info for Advanced UNIX Programming
There are special situations that require you to clear the errno value to zero before making a function call (some examples are strtol(3), strtoul(3), strtod(3), and getpwent(3)). This is necessary because the function will not clear the errno value to zero when success is returned. Under these special circumstances, if the errno value remains as the value 0 (presuming it was cleared prior to the call), then this indicates a successful return. This technique must only be applied to specially indicated functions.
Testing for Errors Using stdio(3) One area that is often overlooked in various texts that describe the stdio(3) set of routines is the proper treatment of errors. You have already seen how to discriminate between an error return and a success return with the fopen(3) call. Immediately after a fopen(3) failure, the value of errno contains the reason for the open failure. 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.
For example int fd; fd = open("/dev/wd0s2f",O_RDWR); if ( fd == -1 ) /* Error handling... */ From this point on, this sample program would have access to the entire disk or disk partition, assuming that the open call succeeded. File systems have their special files protected so that normal users cannot open them this way. If they could, they could seriously corrupt the file system. Tip The open(2) and close(2) functions can return the error EINTR. It is easy to overlook this fact for the close(2) function.
Advanced UNIX Programming by Warren W Gay