does a system call return value??

docetes · 03-16-2006, 02:11 PM

does a system call return value??

if not how would i get the menu choice to return some value

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define script "dialog --backtitle \"Linux Shell Script Tutorial\" \
--title \"Main Menu\" --menu \
\"Move using [UP] [DOWN],[Enter] to Select\" 15 50 3\
1 \"Shows Date and Time\" 2 \"To see calendar\" 3 \"To start vi editor\" "



int main(int arg1, char *arg2[])
{
int a;
a=system(script);
printf("hello");
printf("%d",a);
return 0;
}

thanks for your time

Matir · 03-16-2006, 04:37 PM

System returns the exit value of the called application.

thewonka · 03-16-2006, 05:40 PM

and the exit value is ( just in case somebody reads this and doesnt know ) used to know what happend when the app terminated, you can as in the sample above the "Return 0" or "exit 0" will return a 0 value ( or BIG OK ), if you app needs to stop becuse of a problem ( missing params, file access, etc. ) you can exit with a different code, like exit 1.

You get the idea