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cmd/cgo: make C.malloc(0) return non-nil #6390

rsc opened this issue Sep 15, 2013 · 2 comments


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commented Sep 15, 2013

Now that C.malloc is really C.__Cmalloc where __Cmalloc is our wrapper, we should make
the wrapper change 0 to 1 before calling the standard malloc. The standard malloc(0) can
return NULL, which will make the wrapper crash the program.

Thanks to Ralph Corderoy for the reminder.
(See issue #3403.)

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commented Sep 15, 2013

Comment 1 by ralph.corderoy:

Perhaps only malloc(1) if malloc(0) returns NULL in case there's special handling of 0
that returns non-NULL and is less overhead, e.g. descriptor only.
    if(p == NULL && (n || (p = malloc(1)) == NULL))
        runtime_throw("runtime: C malloc failed");

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commented Sep 16, 2013

Comment 2:

This issue was closed by revision 647eaed.

Status changed to Fixed.

@rsc rsc added fixed labels Sep 16, 2013

@rsc rsc added this to the Go1.2 milestone Apr 14, 2015

@rsc rsc removed the go1.2 label Apr 14, 2015

@golang golang locked and limited conversation to collaborators Jun 25, 2016

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