By Warren W Gay
Complex 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 ebook builds at the talents and information the reader already possesses. It contains insurance of net strategies, interprocess keep watch over, dossier approach manipulation, synchronization, and lots more and plenty extra.
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Additional info for Advanced UNIX Programming
This indicates that both the execute bit (for others) and the sticky bit are present. The sticky bit (S_ISVTX) for directories imposes the rules that the file system object can be removed or renamed only when • • The user has write permission for the directory containing the object. The user is the owner of the file system object itself. The only exception is for the root user, who is permitted to do anything. The sticky bit in this way permits only the user's own files in a given directory to be tampered with.
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. See Chapter 15, "Signals," for a discussion of this error code. Working with Sockets Sockets require special treatment. They are not opened with the normal open(2) call. Instead, sockets are created with the socket(2) or socketpair(2) call. Other socket function calls are used to establish socket addresses and other operating modes.
In practice, however, this function is not very useful. 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.
Advanced UNIX Programming by Warren W Gay