#include <sys/uio.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>

int 
main()
{
        int fd = open("testfile", O_CREAT | O_RDWR, 0666);

        if (fd < 0) {
                printf("file open error %s\n", strerror(errno));
                return 1;
        }

        int dummy;
        int ret;
        iovec vec1 = { &dummy, sizeof(dummy) };
        ret = writev(fd, &vec1, 0x80000001);

        if (ret < 0) {
                printf("vec 1 write error %s\n", strerror(errno));
        }

        iovec vec2 = { (void *)0x80100000, 0x1000 };
        ret = writev(fd, &vec2, 1);

        if (ret < 0) {
                printf("vec 2 write error %s\n", strerror(errno));
        }

        iovec vec3 = { 0, 1 };
        ret = writev(fd, &vec3, 0xfff);

        if (ret < 0) {
                printf("vec 3 write error %s\n", strerror(errno));
        }

        close(fd);

        return 0;
}