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RPC question

Hi!

I'm working on a RPC application, but since I tried to make my code
multithreaded I have a few problems passing strings.

If I have a .x file like this one:

program RCPROG {
version REMOTECOMPILEVERS {
int CREATEFILE(string) = 1;
string TEST(int) = 2;
} = 1;
} = 0x20000001;

and TEST is defined in the server program like this:

bool_t test_1_svc(int*somearg, char **result, struct svc_req *rgstp)

I should be able to pass a string to result_2 (from the invocation of
test_1 in the client program:

char *result_2;
result_2 = (char *)malloc(256);
retval_2 = test_1(&xx,&result_2, clnt);

)like this:

strcpy(*result, "bla");

Right?
Either I'm just too blind to see an obvious mistake I made or I should
go back to basics..
All I want is that the client receives a string as result from
invoking test_1.

(Google didn't help much on this issue because nothing I found dealt
with returning strings in multithreaded mode)
Nov 14 '05 #1
1 1176
On 17 Feb 2004 16:53:09 -0800, ra****@gmx.de (Razzle) wrote in
comp.lang.c:
Hi!

I'm working on a RPC application, but since I tried to make my code
multithreaded I have a few problems passing strings.
You need to take RPC issues to a support group for your particular
compiler/operating system combination. It is not a C language
question, but rather about the extensions your platform provides for
doing this sort of thing. C itself does not define or support RPC.

On the other hand, you might have an actual C problem, so I'll add a
few comments.
If I have a .x file like this one:

program RCPROG {
version REMOTECOMPILEVERS {
int CREATEFILE(string) = 1;
string TEST(int) = 2;
} = 1;
} = 0x20000001;

and TEST is defined in the server program like this:

bool_t test_1_svc(int*somearg, char **result, struct svc_req *rgstp)

I should be able to pass a string to result_2 (from the invocation of
test_1 in the client program:

char *result_2;
result_2 = (char *)malloc(256);
Don't cast the pointer returned by malloc(), it is not necessary in C
and can prevent important compiler warnings.
retval_2 = test_1(&xx,&result_2, clnt);
You haven't shown us the definitions of xx and clnt, which is supposed
to be a pointer to a struct, according to the prototype. Do you test
the value returned by the function? What are the consequences if it
indicates a failure?
)like this:

strcpy(*result, "bla");
What is result? Above you showed the definition of result_2, but you
haven't shown anything about result.
Right?
Either I'm just too blind to see an obvious mistake I made or I should
go back to basics..
All I want is that the client receives a string as result from
invoking test_1.

(Google didn't help much on this issue because nothing I found dealt
with returning strings in multithreaded mode)


C doesn't have a "multithreaded mode". Again, a platform specific
group is what's needed here.

There is so much missing information and non-standard extensions in
your post that I can't tell if you have a real C problem or not.

--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.learn.c-c++
http://www.contrib.andrew.cmu.edu/~a...FAQ-acllc.html
Nov 14 '05 #2

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