readv与writev

[root@bogon mycode]# cat writev.c #include<stdio.h>#include<string.h>#include<unistd.h>#include<sys/uio.h>int main(){    char *str1="linux\n";    char *str2="windows\n";    struct iovec iov[2];//创建结构体，该结构体已经在sys/uio.h头文件中定义    iov[0].iov_base=str1;//赋值    iov[0].iov_len=strlen(str1);    iov[1].iov_base=str2;    iov[1].iov_len=strlen(str2);    writev(1,iov,2);//从结构体iov中取两个数据写到（1）输出屏幕中(0代表输入，1代表输出，2代表错误)    return 0;}[root@bogon mycode]# gcc writev.c [root@bogon mycode]# ./a.outlinuxwindows[root@bogon mycode]# 其中iovec结构体如下struct iovec {    void  *iov_base;    /* Starting address */    size_t iov_len;     /* Number of bytes to transfer */};

[root@bogon mycode]# gcc readv.c [root@bogon mycode]# ./a.outlinuxoknostr1 is linuxokstr2 is no[root@bogon mycode]# cat readv.c #include<stdio.h>#include<string.h>#include<unistd.h>#include<sys/uio.h>int main(){    char buf1[8]={0};    char buf2[8]={0};    struct iovec iov[2];    iov[0].iov_base=buf1;    iov[0].iov_len=sizeof(buf1)-1;//注意是sizeof不是strlen，sizeof的类型是size_t    iov[1].iov_base=buf2;    iov[1].iov_len=sizeof(buf2)-1;    readv(0, iov, 2);//从标准输入读取    printf("str1 is %s\n",buf1);    printf("str2 is %s\n",buf2);    return 0;}[root@bogon mycode]#