Date: Sat, 08 May 1999 10:34:18 -0600 From: Warner Losh <imp@harmony.village.org> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: current@FreeBSD.ORG Subject: Re: m_get(M_WAIT, ...) _can_ return NULL ? Message-ID: <199905081634.KAA14466@harmony.village.org> In-Reply-To: Your message of "Sat, 08 May 1999 15:32:33 %2B0200." <199905081332.PAA07452@labinfo.iet.unipi.it> References: <199905081332.PAA07452@labinfo.iet.unipi.it>
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In message <199905081332.PAA07452@labinfo.iet.unipi.it> Luigi Rizzo writes:
: m = m_get(M_WAIT, ...)
: looking at the code, it seems that m_get() _can_ return a NULL pointer
: even if one specifies M_WAIT.
Looking at the man page for malloc:
M_WAITOK
indicates that it is Ok to wait for resources. It is unconve-
niently defined as 0 so care should be taken never to compare
against this value directly or try to AND it as a flag. The de-
fault operation is to block until the memory allocation succeeds.
malloc() can only return NULL if M_NOWAIT is specified.
Sounds like a bug to me.
Warner
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