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Why does fflush(stdin) fail to work ?
Post 303024405 by Don Cragun on Monday 8th of October 2018 05:25:43 AM
10-08-2018
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When a process fork(), the child share the same file descriptors as his father. Thus, they share the same stdin. Quick and dirty exemple below (sorry for the ugly gets() call) :
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{
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LEARN ABOUT DEBIAN
explain_fflush_or_die
explain_fflush_or_die(3) Library Functions Manual explain_fflush_or_die(3) NAME
explain_fflush_or_die - flush a stream and report errors SYNOPSIS
#include <libexplain/fflush.h> void explain_fflush_or_die(FILE *fp); int explain_fflush_on_error(FILE *fp); DESCRIPTION
The explain_fflush_or_die function is used to call the fflush(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fflush(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_fflush_on_error function is used to call the fflush(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_fflush(3) function, but still returns to the caller. fp The fp, exactly as to be passed to the fflush(3) system call. RETURN VALUE
The explain_fflush_or_die function only returns on success, see fflush(3) for more information. On failure, prints an explanation and exits, it does not return. The explain_fflush_on_error function always returns the value return by the wrapped fflush(3) system call. EXAMPLE
The explain_fflush_or_die function is intended to be used in a fashion similar to the following example: explain_fflush_or_die(fp); SEE ALSO
fflush(3) flush a stream explain_fflush(3) explain fflush(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_fflush_or_die(3)