简单的读一个文件：
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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 < 0) {
perror("/dev/hello");
return -1;
}
read(fd,read_buffer,sizeof(read_buffer)-1);
printf("read_buffer=%s/n",read_buffer);
close(fd);
return 0;
}
---
下面这个就是简单的写一个文件 ，
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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 < 0) {
perror("/dev/hello");
return -1;
}
write(fd,write_buffer,sizeof(write_buffer)-1);
close(fd);
return 0;
}