[cs631apue] setprogname/getprogname not available on Linux

[Yangmu Jiang]

--
Style guide requires to add the following code:
	/*
	 * At the start of main(), call setprogname() to set the program
	 * name.  This does nothing on NetBSD, but increases portability
	 * to other systems.
	 */
	setprogname(argv[0]);
If setprogname()/getprogname() exists, they should be in <stdlib.h>, but google told me
Linux doesn’t have such functions, they belong to *BSD. So, I can’t get tcp.c compiled
if I follow the style guide.
Does anybody have the same question? Shall we ignore the style guide?

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