Warren W Gay's Advanced UNIX Programming PDF

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

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 e-book builds at the talents and data the reader already possesses. It comprises assurance of web methods, interprocess keep watch over, dossier approach manipulation, synchronization, and masses extra.

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H. h> Using symbolic macro references for error codes is important, since it allows your C programs to be portable to other UNIX platforms. Only a compile is required to reference the correct numeric value for these codes on a given platform. UNIX errno codes are non-zero values and usually start at 1 and work up. Zero is sometimes used to indicate "no error" (this convention is used in rare cases with the functions strtol(3), strtoul(3), and strtod(3), for example). Applying errno Correctly There is a temptation for novice programmers to use the errno value to test for success.

H>. You should no longer declare it as an external integer variable. h> include file will define errno in a manner that is appropriate for your specific UNIX platform. This also defines the errno macro constants for the error codes. Using the New errno Variable Once variable errno is appropriately declared for your platform, you can still use it as you did before. For example int saved_errno; saved_errno = errno; printf("errno = %d\n",errno); errno = ENOENT; errno = 0; /* /* /* /* Saving errno */ Inspecting errno */ Changing errno */ Clearing errno to zero */ You can obtain value of errno and change its value, just as before its definition changed.

Access of Regular Files This is perhaps the simplest case to consider. Files can be controlled by • • • Read access Write access Execute access These are relatively simple concepts. However, a couple of interesting combinations exist: • • A file that has read and execute access A file that has execute-only access The first case is necessary for shell scripts. /bin/ksh hack, the UNIX kernel insists that the execute permission be given on the shell script. Additionally, the shell itself must interpret the file, so it must access enough to read the script.

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Advanced UNIX Programming by Warren W Gay

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