There is shockingly very little documentation on how to use uFFI. In
particular, I have the following situation...
A shared C lib has the following function:
void get_machine(char *machine) {
uname(&uname_s);
strcpy(machine, uname_s.machine);
}
It copies the content of a string value into the buffer passed to it (char
*machine).
I want to call this function from Pharo, thus:
buffer := String new: 64.
self ffiCall: #( void get_machine(String buffer) ).
The buffer never receives the string value (it just contains the 64
initiialized spaces).
Clearly, I'm misunderstanding the proper mechanism for doing this.
[There are other functions in the shared C lib that work fine, such as:
uint get_uptime() {
sysinfo(&info);
return info.uptime;
}
Returning integers or floats is no problem. But passing arguments by
reference seems to be verboten.]
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