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+'\" et
+.TH sys_select.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+sys/select.h
+\(em select types
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/select.h>
+.fi
+.SH DESCRIPTION
+The
+.IR <sys/select.h>
+header shall define the
+.BR timeval
+structure, which shall include at least the following members:
+.sp
+.RS 4
+.nf
+
+time_t tv_sec \fRSeconds.\fR
+suseconds_t tv_usec \fRMicroseconds.\fR
+.fi
+.P
+.RE
+.P
+The
+.IR <sys/select.h>
+header shall define the
+.BR time_t
+and
+.BR suseconds_t
+types as described in
+.IR <sys/types.h> .
+.P
+The
+.IR <sys/select.h>
+header shall define the
+.BR sigset_t
+type as described in
+.IR <signal.h> .
+.P
+The
+.IR <sys/select.h>
+header shall define the
+.BR timespec
+structure as described in
+.IR <time.h> .
+.P
+The
+.IR <sys/select.h>
+header shall define the
+.BR fd_set
+type as a structure.
+.P
+The
+.IR <sys/select.h>
+header shall define the following symbolic constant, which shall have
+a value suitable for use in
+.BR #if
+preprocessing directives:
+.IP FD_SETSIZE 12
+Maximum number of file descriptors in an
+.BR fd_set
+structure.
+.P
+The following shall be declared as functions, defined as macros, or
+both. If functions are declared, function prototypes shall be
+provided.
+.sp
+.RS 4
+.nf
+
+void FD_CLR(int, fd_set *);
+int FD_ISSET(int, fd_set *);
+void FD_SET(int, fd_set *);
+void FD_ZERO(fd_set *);
+.fi
+.P
+.RE
+.P
+If implemented as macros, these may evaluate their arguments more than
+once, so applications should ensure that the arguments they supply are
+never expressions with side-effects.
+.P
+The following shall be declared as functions and may also be defined as
+macros. Function prototypes shall be provided.
+.sp
+.RS 4
+.nf
+
+int pselect(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
+ const struct timespec *restrict, const sigset_t *restrict);
+int select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
+ struct timeval *restrict);
+.fi
+.P
+.RE
+.P
+Inclusion of the
+.IR <sys/select.h>
+header may make visible all symbols from the headers
+.IR <signal.h>
+and
+.IR <time.h> .
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fB<signal.h>\fP",
+.IR "\fB<sys_time.h>\fP",
+.IR "\fB<sys_types.h>\fP",
+.IR "\fB<time.h>\fP"
+.P
+The System Interfaces volume of POSIX.1\(hy2017,
+.IR "\fIpselect\fR\^(\|)"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .