Advanced UNIX Programming (Sams White Book Series) by Warren W Gay PDF

By Warren W Gay

Complex UNIX Programming is going past the basics of UNIX programming and provides info and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this booklet builds at the abilities and data the reader already possesses. It contains insurance of web techniques, interprocess keep watch over, dossier approach manipulation, synchronization, and lots more and plenty extra.

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Extra resources for Advanced UNIX Programming (Sams White Book Series)

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The first problem is that the message must go to standard error. If the message must be • • • • Written to a log file Reported to an X Window pop-up Reported in a different format Stored as a string then the function perror(3) is not able to help. Another problem that often occurs is this: What if the error code is not coming from errno but some other variable? The perror(3) function seems best left to academic examples because of its simplicity. Using the sys_errlist[] Array If you look up the perror(3) function in the FreeBSD man(1) pages (and on most UNIX platforms), you will also see that it describes the sys_errlist[] array.

In addition to slow data transfer, disk rotation and head seek latencies add to the overall wait time involved in a disk I/O operation. Consequently, block devices are buffered with a disk cache by the UNIX kernel. The disk cache will usually retain the most recently used disk blocks, but cache algorithms vary in order to achieve different performance goals. Because disk cache dramatically improves the performance of the file system, all file systems tend to be mounted using the block device. Block devices can be readily identified by the ls(1) command as follows: $ mount /dev/wd0s2a on / (ufs, local, writes: sync 4505 async 92908) /dev/wd0s2e on /usr (ufs, local, writes: sync 6924 async 118551) procfs on /proc (procfs, local) $ ls -l /dev/wd0s2a brw-r----- 1 root operator 0, 0x00030000 Feb 19 11:05 /dev/wd0s2a $ The mount(8) (on many systems mount(1M)) command is used to find out what block devices have been used.

Only errors (failures) are posted to this variable. 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.

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