freopen内部实现

 1 #include <unistd.h>

 2 #include <stdio.h>

 3

 4 FILE* Freopen(const char *fileName, const char *type, FILE *stream){

 5   FILE *fileFp = fopen(fileName, type);

 6   int fd1 = fileno(fileFp);

 7   int fd2 = fileno(stream);

 8   if(dup2(fd1, fd2) < 0) return NULL;

 9   else return stream;

10 }

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