In computer programming, the fopen, with related functions fdopen and freopen, is one of basic functions in C programming language. Because it is so popular that many script languages derivered from C tend to provide the same function with the same or similar functionality. It is considered more high-level than the open system call of UNIX operating systems.
They are defined as.
FILE * fopen(const char *path, const char *mode);FILE * fdopen(int fildes, const char *mode);FILE * freopen(const char *path, const char *mode, FILE * restrict stream);