How to create a global variable G-Wan correctly?
--- config.h
extern char userurl[3];
char userurl[3];
--- index.c
include "config.h"
int main(int argc, char *argv[]) {
char *req_g="",*req_p="";
get_arg("g=", &req_g, argc,argv);
get_arg("p=", &req_p, argc,argv);
strcat(userurl,req_g);
strcat(userurl,req_p);
..
xbuf_xcat(reply,"%s",userurl);
..
return 200;
}
Then I used http://127.0.0.1:8080/?index&g=a&p=b
I reload multiple times and duplicate results: userurl is not freed ...
What's the correct way to declare variables extern
or global
for gwan?
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Each G-WAN script is compiled separately. As a result, all your variables are static (local to this module) - you cannot share them without using pointers and atomic operations.
To facilitate the use of global variables, G-WAN provides persistent pointers ( US_HANDLER_DATA
, US_VHOST_DATA
or US_REQUEST_DATA
):
void *pVhost_persistent_ptr = (void*)get_env(argv, US_VHOST_DATA);
if(pVhost_persistent_ptr)
printf("%.4s\n", pVhost_persistent_ptr);
// get a pointer on a pointer (to CHANGE the pointer value)
void **pVhost_persistent_ptr = (void*)get_env(argv, US_VHOST_DATA);
if(pVhost_persistent_ptr)
*pVhost_persistent_ptr = strdup("persistent data");
Several examples, such as persistence.c or stream3.c, illustrate how to operate with real programs.
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