libc.info: Stdio

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Input and Output (`stdio.h')

This chapter comprises functions to manage files or other input/output
streams. Among these functions are subroutines to generate or scan
strings according to specifications from a format string.
   The underlying facilities for input and output depend on the host
system, but these functions provide a uniform interface.
   The corresponding declarations are in `stdio.h'.
   The reentrant versions of these functions use macros
     _stdin_r(REENT)
     _stdout_r(REENT)
     _stderr_r(REENT)
instead of the globals `stdin', `stdout', and `stderr'.  The argument
<[reent]> is a pointer to a reentrancy structure.