vmsplice_test.c

#include <zlib.h>
#include <time.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/uio.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>
#include "kseq.h"
#include "kstring.h"

int main(int argc, char *argv[]) {
    char buf[1000] = {0};
    char *p = buf;
    int p1, f;

    struct iovec iov;

    f = open(argv[1], O_RDONLY);
    p1 = open("f1", O_WRONLY);
    while(read(f, buf, sizeof(buf)) > 0) {
        //printf("\n1>%c\n", p);
        //printf("> %c\n", p[0]);
        printf("%.1000s", p); 

        //strcat(buf, "\n");
        //write(p1, buf, strlen(buf));
    
        int len = strlen(buf);
        int ret;
        printf("\nDEBUG> total %d\n", len);
        while(len) {
            iov.iov_base = buf;
            iov.iov_len =  strlen(buf);
            ret =vmsplice(p1, &iov, 1, 8);
            printf("\nDEBUG> Send %d bytes\n", ret);

            len -= ret;
            iov.iov_len -= ret;
            iov.iov_base += ret;
            //printf("\nDEBUG> Send %d\n", ret);
        }

        memset(p, 0, 100);
    }
    close(p1);
    close(f);
}