Tim Hawes wrote:
Hello all,
I am trying to write an extension in C that returns a simple environment
variable. The code compiles without any complaint or warning, and it
loads fine into the database, however, when I run the function, I get
disconnected from the server.
Here is my C code:
#include <postgres.h>
#include <fmgr.h>
PG_MODULE_MAGIC;
#include <stdio.h>
#include <stdlib.h>
PG_FUNCTION_INFO_V1(pl_masterkey);
text * pl_masterkey(PG_FUNCTION_ARGS)
{
char *e_var = getenv("PGMASTERKEY");
size_t length = VARSIZE(e_var) - VARHDRSZ;
text * mkey = (text *) palloc(length);
VARATT_SIZEP(mkey) = length;
memcpy(VARDATA(mkey), e_var, length);
return mkey;
}
Oh, you confused a lot of things.
You need something like
Datum pl_masterkey(PG_FUNCTION_ARGS) {
char *e_var = getenv("PGMASTERKEY");
PG_RETURN_TEXT_P(cstring_to_text(e_var));
}
You don't need to mess with anything varlena-related (liek VARSIZE),
it's all handled for you.
Also, read up on how to declare user-defined C functions in Postgres
(they always need to return Datum).
Cheers,
Jan
--
Jan Urbanski
GPG key ID: E583D7D2
ouden estin
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