13.2. Buffering in the stdio Library

Buffering of data into large blocks to reduce system calls is exactly what is done by the C library I/O functions (e.g., fprintf(), fscanf(), fgets(), fputs(), fputc(), fgetc()) when operating on disk files. Thus, using the stdio library relieves us of the task of buffering data for output with write() or input via read().

13.2.1.

13.2.1.1. Setting the buffering mode of a stdio stream

The setvbuf() function controls the form of buffering employed by the stdio library.