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-.\" Copyright (c) 2007 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2007-07-31, mtk, Created
-.\"
-.TH timeradd 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-timeradd, timersub, timercmp, timerclear, timerisset \- timeval operations
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/time.h>
-.P
-.BI "void timeradd(struct timeval *" a ", struct timeval *" b ,
-.BI "              struct timeval *" res );
-.BI "void timersub(struct timeval *" a ", struct timeval *" b ,
-.BI "              struct timeval *" res );
-.P
-.BI "void timerclear(struct timeval *" tvp );
-.BI "int timerisset(struct timeval *" tvp );
-.P
-.BI "int timercmp(struct timeval *" a ", struct timeval *" b ", " CMP );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-All functions shown above:
-.nf
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    glibc 2.19 and earlier:
-        _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-The macros are provided to operate on
-.I timeval
-structures, defined in
-.I <sys/time.h>
-as:
-.P
-.in +4n
-.EX
-struct timeval {
-    time_t      tv_sec;     /* seconds */
-    suseconds_t tv_usec;    /* microseconds */
-};
-.EE
-.in
-.P
-.BR timeradd ()
-adds the time values in
-.I a
-and
-.IR b ,
-and places the sum in the
-.I timeval
-pointed to by
-.IR res .
-The result is normalized such that
-.I res\->tv_usec
-has a value in the range 0 to 999,999.
-.P
-.BR timersub ()
-subtracts the time value in
-.I b
-from the time value in
-.IR a ,
-and places the result in the
-.I timeval
-pointed to by
-.IR res .
-The result is normalized such that
-.I res\->tv_usec
-has a value in the range 0 to 999,999.
-.P
-.BR timerclear ()
-zeros out the
-.I timeval
-structure pointed to by
-.IR tvp ,
-so that it represents the Epoch: 1970-01-01 00:00:00 +0000 (UTC).
-.P
-.BR timerisset ()
-returns true (nonzero) if either field of the
-.I timeval
-structure pointed to by
-.I tvp
-contains a nonzero value.
-.P
-.BR timercmp ()
-compares the timer values in
-.I a
-and
-.I b
-using the comparison operator
-.IR CMP ,
-and returns true (nonzero) or false (0) depending on
-the result of the comparison.
-Some systems (but not Linux/glibc),
-have a broken
-.BR timercmp ()
-implementation,
-.\" HP-UX, Tru64, Irix have a definition like:
-.\"#define timercmp(tvp, uvp, cmp) \
-.\"    ((tvp)->tv_sec cmp (uvp)->tv_sec || \
-.\"    (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
-in which
-.I CMP
-of
-.IR >= ,
-.IR <= ,
-and
-.I ==
-do not work;
-portable applications can instead use
-.P
-.in +4n
-.EX
-!timercmp(..., <)
-!timercmp(..., >)
-!timercmp(..., !=)
-.EE
-.in
-.SH RETURN VALUE
-.BR timerisset ()
-and
-.BR timercmp ()
-return true (nonzero) or false (0).
-.SH ERRORS
-No errors are defined.
-.SH STANDARDS
-None.
-.SH HISTORY
-BSD.
-.SH SEE ALSO
-.BR gettimeofday (2),
-.BR time (7)