unix/Linux 低级IO函数的用法read && write

edwinrong

简单的读一个文件：
#include
#include
#include
#include
int main(int argc,char **argv)
{
        int fd = 0;
        int pid = 0;
        char buffer[20] = {'\0'};
        char *read_buffer[20] = {'\0'};
        //fd = open("/dev/hello",O_RDWR | O_CREAT | O_TRUNC);
        fd = open("/dev/hello",O_RDONLY ); //| O_NONBLOCK);
        printf("fd=%d\n",fd);
        if(fd
#include
#include
#include
int main(int argc,char **argv)
{
        int fd = 0;
        int pid = 0;
        char buffer[20] = {'\0'};
        char write_buffer[20] = {'\0'};
        strcpy(write_buffer,"zhanglinbao");
        fd = open("/dev/hello",O_RDWR | O_CREAT | O_TRUNC);
        //fd = open("/dev/hello",O_RDONLY);
        printf("fd=%d\n",fd);
        if(fd

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fbi333444

马拉个吧子 写的啥几把玩意啊