Date: Sat, 21 Feb 2004 18:06:35 +0100 From: Maxime Henrion <mux@freebsd.org> To: Petri Helenius <pete@rommon.com> Cc: FreeBSD - net <freebsd-net@freebsd.org> Subject: Re: malloc (0) Message-ID: <20040221170635.GL35475@elvis.mu.org> In-Reply-To: <40378E93.3010804@rommon.com> References: <40378E93.3010804@rommon.com>
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Petri Helenius wrote: > > I?m asking the net list because I came across this when browsing through > the networking / resolver code. > > The question is if the code should check for zero value before calling > malloc or is malloc(0) legal if the pointer is never used? > > I came across this when using dmalloc library and it started complaining > about zero sized allocations from get_addrselectpolicy. In C99, malloc(0) is legal. From n869.txt : %% If the size of the space requested is zero, the behavior is implementation-defined: either a null pointer is returned, or the behavior is as if the size were some nonzero value, except that the returned pointer shall not be used to access an object. %% As a side note, free(NULL) is also legal in C99. Cheers, Maxime
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