Linux底层文件操作

妖刀路过

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

int main(void) {

  char buff[] = "hello world\n";
  //1 2 都是输出到控制台
  int len = 0;
  len = write(1, buff, sizeof(buff));//标准输出
  if (len < 0) {
    printf("write failed.reason:%s\n",strerror(errno));
  }
  len = write(2, buff, sizeof(buff));//标准出错输出
  if (len < 0) {
    printf("write failed.reason:%s\n", strerror(errno));
  }
  return 0;
}