Get Advanced UNIX Programming PDF

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

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 booklet builds at the abilities and data the reader already possesses. It comprises insurance of net strategies, interprocess keep an eye on, dossier procedure manipulation, synchronization, and masses extra.

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Using the perror(3) Function One function provided for reporting errors is the library function perror(3). This function takes one string argument and writes that string to stderr, followed by a colon and then a message for the current errno value. h> void perror(const char *s); This function is easily tested by simply assigning an error of our choice to errno and calling perror(3). 1. h> int main(int argc,char **argv) { errno = EIO; perror("Test EIO Message"); return 0; } Line 7 shows how an I/O error was assigned to the errno variable (the error code was arbitrarily chosen to simulate an error).

However, be careful that what you are doing in this scenario does not upset what is being managed by the stdio(3) routines. For example, it might seem harmless to duplicate a file descriptor being used by stdio(3) and then call lseek(2) on the duplicated file descriptor. However, this will also change the file position for the original file descriptor. For some implementations of the stdio(3) library, this may cause you grief. Summary For many readers, this chapter has been a review. For those ramping up their knowledge to program in C under UNIX, this chapter will have exposed you to some important UNIX concepts.

Conceptually, this number is a handle that refers back to the file that you named in the open(2) call. File descriptors returned from an open(2) call allow you to name the path of the file system object once. After you have a file descriptor, you can read the /etc/hosts file one line at a time by providing the file descriptor to the read(2) function. The UNIX kernel then knows which file you mean, because it remembers it from the earlier open(2) call. This provides flexibility also, since open(2) can be called a second (or nth) time for the same file.

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Advanced UNIX Programming by Warren W Gay

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