.TH LIBSIMPLE_DIFFTIMESPEC 3 libsimple
.SH NAME
libsimple_difftimespec, libsimple_difftimeval \- calculate the difference of two durations

.SH SYNOPSIS
.nf
#include <libsimple.h>

int libsimple_difftimespec(struct timespec *\fIdiff\fP, const struct timespec *\fIminuend\fP, const struct timespec *\fIsubtrahend\fP);
int libsimple_difftimeval(struct timeval *\fIdiff\fP, const struct timeval *\fIminuend\fP, const struct timeval *\fIsubtrahend\fP);

#ifndef difftimespec
# define difftimespec libsimple_difftimespec
#endif
#ifndef difftimeval
# define difftimeval libsimple_difftimeval
#endif
.fi
.PP
Link with
.IR \-lsimple .

.SH DESCRIPTION
The
.BR libsimple_difftimespec ()
and
.BR libsimple_difftimeval ()
functions calculates the diffence of
.I minuend
and
.I subtrahend
.RI ( minuend
is subtracted by
.IR subtrahend )
and stores the result in
.IR diff .
.PP
These functions assume that
.I minuend->tv_nsec
and
.I subtrahend->tv_nsec
are in thier valid range ([0, 1000000000) for
.BR libsimple_sumtimespec ()
and [0, 1000000) for
.BR libsimple_sumtimeval ())

.SH RETURN VALUE
The
.BR libsimple_difftimespec ()
and
.BR libsimple_difftimeval ()
functions return 0 on successful completion;
otherwise, \-1 is returned and
.I errno
is set to indicate the error.

.SH ERRORS
The
.BR libsimple_difftimespec ()
and
.BR libsimple_difftimeval ()
functions fail if:
.TP
.B ERANGE
The result is too large or too small to be stored; if the
result is too large
.I *diff
will be set to
.I {.tv_sec=TIME_MAX,.tv_nsec=999999999L}
for the
.BR libsimple_difftimespec ()
function and to
.I {.tv_sec=TIME_MAX,.tv_usec=999999L}
for the
.BR libsimple_difftimeval ()
function, if the result is too small
.I *diff
will be set to
.I {.tv_sec=TIME_MIN,.tv_nsec=0}
for the
.BR libsimple_difftimespec ()
function and to
.I {.tv_sec=TIME_MIN,.tv_usec=0}
for the
.BR libsimple_difftimeval ()
function.

.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR libsimple_difftimespec ()
.br
.BR libsimple_difftimeval ()
T}	Thread safety	MT-Safe
T{
.BR libsimple_difftimespec ()
.br
.BR libsimple_difftimeval ()
T}	Async-signal safety	AS-Safe
T{
.BR libsimple_difftimespec ()
.br
.BR libsimple_difftimeval ()
T}	Async-cancel safety	AC-Safe
.TE

.SH EXAMPLES
None.

.SH APPLICATION USAGE
None.

.SH RATIONALE
None.

.SH FUTURE DIRECTIONS
None.

.SH NOTES
None.

.SH HISTORY
libsimple 1.0

.SH BUGS
None.

.SH SEE ALSO
.BR libsimple_sumtimespec (3),
.BR libsimple_multimespec (3),
.BR libsimple_cmptimespec (3),
.BR libsimple_timespectostr (3),
.BR libsimple_strtotimespec (3),
.BR libsimple_timespectodouble (3),
.BR libsimple_doubletotimespec (3),
.BR libsimple_timeval2timespec (3)