By Warren W Gay
Complicated 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 abilities and information the reader already possesses. It contains insurance of web methods, interprocess keep an eye on, dossier process manipulation, synchronization, and masses extra.
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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.
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. Perhaps you learned a few historical tidbits along the way. Chapter 3 is another foundation-building chapter. Veterans can skip that chapter if they are in a hurry. If you are still building up your knowledge about UNIX programming, you will want to pay special attention to this chapter.
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.