implicit declaration of function ‘***’原因分析

编译时出现的warning:

ep-demo.c:16:5: warning: implicit declaration of function ‘mkfifo’ [-Wimplicit-function-declaration]
            mkfifo("/tmp/fifo1",0666);  
             ^
ep-demo.c:43:13: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration]
             read(events[i].data.fd, &c, 1);  
             ^
ep-demo.c:58:5: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration]
             close(fd1);  

             ^

原因分析：

出现这种现象一般是缺少显式声明。

解决办法：

添加头文件：#include      //for read close

添加头文件：#include    //for mkfifo

添加头文件：include           //for open 

参考资料：https://blog.csdn.net/linbe_ice/article/details/1498972

                 https://blog.csdn.net/asmcvc/article/details/72847011

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