source: trunk/minix/test/select/test00.c@ 22

/*
 * Test name: test00.c
 *
 * Objetive: The purpose of this test is to make sure that the bitmap 
 * manipulation macros work without problems.  
 *
 * Description: This tests first fills a fd_set bit by bit, and shows it, then
 * it clears the fd_set bit by bit as well. 
 *
 * Jose M. Gomez
 */

#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/select.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

int main(int argc, char *argv[]) {
        fd_set fds;
        int i,j;        

        FD_ZERO(&fds);
        for (i=0;i<FD_SETSIZE;i++) {
                /* see if SET works */
                FD_SET(i, &fds);
                if(!FD_ISSET(i, &fds))
                        return 1;
        }
        FD_ZERO(&fds);
        for (i=0;i<FD_SETSIZE;i++) {
                /* see if ZERO works */
                if(FD_ISSET(i, &fds))
                        return 1;
        }
        for (i=0;i<FD_SETSIZE;i++) {
                FD_SET(i, &fds);
                for(j = 0; j <= i; j++)
                        if(!FD_ISSET(j, &fds))
                                return 1;
                for(; j < FD_SETSIZE; j++) 
                        if(FD_ISSET(j, &fds))
                                return 1;
        }
        for (i=0;i<FD_SETSIZE;i++) {
                FD_CLR(i, &fds);
                for(j = 0; j <= i; j++)
                        if(FD_ISSET(j, &fds))
                                return 1;
                for(; j < FD_SETSIZE; j++) 
                        if(!FD_ISSET(j, &fds))
                                return 1;
        }
        printf("ok\n");
        return 0;
}