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call C routine on a Linux computer [message #18841]

Tue, 08 February 2000 00:00

Shunrong Zhang
Messages: 1
Registered: February 2000

Junior Member

Hi,

I was trying to call a simple C routine using call_external, but failed.

The C code file is sample.c (IDL 5.1 External Development Guide, p 108)

#include <stdio.h>
float sum_array(argc, argv)
int argc;
void *argv[];
{
float *fp, s = 0.0; int n;
for(n = *(int *) argv[1], fp = (float *) argv[0]; n--; )
s += *fp++;
return(s);}

I worked with a Linux computer, and the C compiler is gcc (v2.7). So I
compiled and linked in the following way,

cc -fPIC -c sample.c
ld -shared -o sample.so sample.o

Then from IDL,

X = FINDGEN(10)
S = CALL_EXTERNAL('sample.so', '_sum_array' X, N_ELEMENTS(X),
/F_VALUE)

There came out a message of syntax error.
I changed the entry point name from '_sum_array' to 'sum_array', the
same error message came out.

What was my entry point name ? Anything wrong in my above procedure ?

Thank you in advance !

S.-R.

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[Message index]

		call C routine on a Linux computer By: Shunrong Zhang on Tue, 08 February 2000 00:00
		Re: call C routine on a Linux computer By: Steve[2] on Wed, 09 February 2000 00:00

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