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Re: Memory Allocation Error

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "zhuge xiao" <zhuge(at)Rinaix(dot)cn>
Cc: <pgsql-bugs(at)postgresql(dot)org>
Subject: Re: Memory Allocation Error
Date: 2007-09-24 12:00:06
Message-ID: 87ir60ff3t.fsf@oxford.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-bugs
"zhuge xiao" <zhuge(at)Rinaix(dot)cn> writes:

> I wrote and compiled and linked a C function, add_float, which returns
> float in C like following:
>
> PG_FUNCTION_INFO_V1(add_float);
>
> Datum
> add_float(PG_FUNCTION_ARGS)
> {
> float arg = PG_GETARG_FLOAT8(0);
>
> PG_RETURN_FLOAT8(arg + 10);
> }
>
> After having loaded it into database, executed the SQL command, "select
> ad_float(2.90)", but one error occured. The error message is "Error:
> invalid memory alloc request size 4294967290" .

float8 and float aren't the same thing. "float" is a C data type which is not
wide enough to hold a float8. The first line actually works by shortening it
but the return doesn't work because it returns a pointer to the float and
claims it's a pointer to the float8.


-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com

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