.TH LIBSIMPLE_DIFFTIMESPEC 3 2018-10-29 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 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)
