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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
+.TH "<sys/time.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/time.h>
+.SH NAME
+sys/time.h \- time types
+.SH SYNOPSIS
+.LP
+\fB#include <sys/time.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/time.h>\fP header shall define the \fBtimeval\fP structure
+that includes at least the following members:
+.sp
+.RS
+.nf
+
+\fBtime_t tv_sec \fP Seconds. \fB
+suseconds_t tv_usec \fP Microseconds. \fB
+\fP
+.fi
+.RE
+.LP
+The \fI<sys/time.h>\fP header shall define the \fBitimerval\fP structure
+that includes at least the following
+members:
+.sp
+.RS
+.nf
+
+\fBstruct timeval it_interval\fP Timer interval. \fB
+struct timeval it_value \fP Current value. \fB
+\fP
+.fi
+.RE
+.LP
+The \fBtime_t\fP and \fBsuseconds_t\fP types shall be defined as described
+in \fI<sys/types.h>\fP .
+.LP
+The \fBfd_set\fP type shall be defined as described in \fI<sys/select.h>\fP
+\&.
+.LP
+The \fI<sys/time.h>\fP header shall define the following values for
+the \fIwhich\fP argument of \fIgetitimer\fP() and \fIsetitimer\fP():
+.TP 7
+ITIMER_REAL
+Decrements in real time.
+.TP 7
+ITIMER_VIRTUAL
+Decrements in process virtual time.
+.TP 7
+ITIMER_PROF
+Decrements both in process virtual time and when the system is running
+on behalf of the process.
+.sp
+.LP
+The following shall be defined as described in \fI<sys/select.h>\fP
+: \fIFD_CLR\fP() \fIFD_ISSET\fP() \fIFD_SET\fP() \fIFD_ZERO\fP() FD_SETSIZE
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBint getitimer(int, struct itimerval *);
+int gettimeofday(struct timeval *restrict, void *restrict);
+int select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
+ struct timeval *restrict);
+int setitimer(int, const struct itimerval *restrict,
+ struct itimerval *restrict);
+int utimes(const char *, const struct timeval [2]); (\fP\fBLEGACY\fP \fB)
+\fP
+.fi
+.RE
+.LP
+Inclusion of the \fI<sys/time.h>\fP header may make visible all symbols
+from the \fI<sys/select.h>\fP header.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<sys/select.h>\fP , \fI<sys/types.h>\fP , the System Interfaces
+volume of IEEE\ Std\ 1003.1-2001, \fIgetitimer\fP(), \fIgettimeofday\fP(),
+\fIselect\fP(), \fIsetitimer\fP()
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 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 .