Advanced UNIX Programming by Warren W Gay

By Warren W Gay

Complicated UNIX Programming is going past the basics of UNIX programming and offers details and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this publication builds at the abilities and information the reader already possesses. It comprises insurance of net strategies, interprocess regulate, dossier method manipulation, synchronization, and masses extra.

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FreeBSD open(2) Flag Bits Flag O_RDONLY O_WRONLY O_RDWR O_NONBLOCK O_APPEND O_CREAT O_TRUNC O_EXCL O_SHLOCK O_EXLOCK Description Open for read only Open for write only Open for read and write Do not block on open Append with each write Create file if necessary Truncate file to 0 bytes Error if creating and the file already exists Atomically obtain a shared lock Atomically obtain an exclusive lock The flag O_NONBLOCK causes the open(2) call not to block while waiting for the device to be ready. For example, opening a modem device can cause it to wait until a carrier is detected.

This is the job of file system software. Similarly, a database manages tables and rows within a raw device. The cache feature of block devices may seem to suggest that a block device should be a good candidate for a database. This is usually not the case, however, since the database engine has its own custom cache algorithms that are tuned to the way that the database accesses the disk device. For this reason, database engines like Oracle, Sybase, and Informix usually perform better with the corresponding character device.

Warning Note that the example avoided testing for errors for close(2), which should be done. Test for the error EINTR, and retry the close(2) call if the EINTR error occurs. UNIX File I/O Many C programming texts teach the reader how to do I/O using the stdio(3) functions fopen(3), fgets(3), fread(3), fwrite(3), and the rest. Because UNIX supports the stdio(3) interface, many new UNIX programmers think of this as UNIX file I/O. However, this interface is simply the stdio(3) set of routines, which is layered on top of the UNIX system calls.

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