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.Dd "Dec 20, 2014" .Dt FCLOSEALL 3C .Os .Sh NAME .Nm fcloseall .Nd close all standard I/O streams .Sh SYNOPSIS n stdio.h .Ft int .Fo fcloseall .Fa void .Fc .Sh DESCRIPTION The .Fn fcloseall function closes all open standard I/O streams. The equivalent of .Xr fflush 3C is called on each stream before closing, thus any buffered or pending input is discarded while any buffered or pending output is written out to the underlying file. This includes the standard streams, .Vt stdin , .Vt stdout , and .Vt stderr . .Sh RETURN VALUES Currently, the function .Fn fcloseall always returns .Sy 0 . Note, portable applications should always check the return value. .Sh INTERFACE STABILITY .Sy Committed . .Sh MT-LEVEL .Sy Mt-Safe . .Sh SEE ALSO .Xr close 3C , .Xr fflush 3C , .Xr attributes 5 , .Xr environ 5 , .Xr standards 5