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Cygwin consists of three parts: a dynamic-link library (DLL) as an API compatibility layer in the form of a C standard library providing a substantial part of the POSIX API functionality, an extensive collection of software tools and applications that provide a Unix-like look and feel, and an MOTIF-based window manager.
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fcloseall(3) [plan9 man page]

FCLOSEALL(3)						     Linux Programmer's Manual						      FCLOSEALL(3)

NAME
fcloseall - close all open streams SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdio.h> int fcloseall(void); DESCRIPTION
The fcloseall() function closes all of the calling process's open streams. Buffered output for each stream is written before it is closed (as for fflush(3)); buffered input is discarded. The standard streams, stdin, stdout, and stderr are also closed. RETURN VALUE
This function returns 0 if all files were successfully closed; on error, EOF is returned. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +------------+---------------+------------------------+ |Interface | Attribute | Value | +------------+---------------+------------------------+ |fcloseall() | Thread safety | MT-Unsafe race:streams | +------------+---------------+------------------------+ The fcloseall() function does not lock the streams, so it is not thread-safe. CONFORMING TO
This function is a GNU extension. SEE ALSO
close(2), fclose(3), fflush(3), fopen(3), setbuf(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU
2017-09-15 FCLOSEALL(3)

Check Out this Related Man Page

FCLOSEALL(3)						     Linux Programmer's Manual						      FCLOSEALL(3)

NAME
fcloseall - close all open streams SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdio.h> int fcloseall(void); DESCRIPTION
The fcloseall() function closes all of the calling process's open streams. Buffered output for each stream is written before it is closed (as for fflush(3)); buffered input is discarded. The standard streams, stdin, stdout, and stderr are also closed. RETURN VALUE
This function returns 0 if all files were successfully closed; on error, EOF is returned. ATTRIBUTES
Multithreading (see pthreads(7)) The fcloseall() function does not lock the streams, so it is not thread-safe. CONFORMING TO
This function is a GNU extension. SEE ALSO
close(2), fclose(3), fflush(3), fopen(3), setbuf(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2013-06-21 FCLOSEALL(3)

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