编译错误解决：implicit declaration of function 'close' is invalid in C99

编译错误

error:
      implicit declaration of function 'close' is invalid in C99
      [-Werror,-Wimplicit-function-declaration]
        close(tfd);
        ^
1 error generated.

解决方案

在出错的这个文件中添加头文件包含：

#include <fcntl.h> // for open
#include <unistd.h> // for close

参考：

c - Implicit declaration of function ‘close’ - Stack Overflow