@node sys/select.h
@section @file{sys/select.h}

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_select.h.html}

Gnulib module: sys_select-h
@mindex sys_select-h

Portability problems fixed by Gnulib:
@itemize
@item
This header file is missing on some platforms:
HP-UX 11.11, NonStop Kernel, mingw, MSVC 14.
@item
This header file is not self-contained on some platforms: it requires
@code{<sys/types.h>} to be included first.
@item
This header file is not self-contained---it requires @code{<string.h>}
before @code{FD_ZERO} can be used---on some platforms:
AIX 7.1, Solaris 11.4.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
POSIX.1-2024 allows, but does not require, this file to make visible
all symbols from the headers @code{<signal.h>} and @code{<time.h>}.
Programs should not assume that these other symbols are visible merely
because this file is included, or that they are invisible because only
this file is included.
@end itemize
