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@c
@c COPYRIGHT (c) 1988-1998.
@c On-Line Applications Research Corporation (OAR).
@c All rights reserved.
@c
@c $Id$
@c
@chapter Clock Manager
@section Introduction
The clock manager ...
The directives provided by the clock manager are:
@itemize @bullet
@item @code{clock_gettime} -
@item @code{clock_settime} -
@item @code{clock_getres} -
@item @code{nanosleep} -
@item @code{gettimeofday} -
@item @code{time} -
@end itemize
@section Background
@section Operations
@section Directives
This section details the clock manager's directives.
A subsection is dedicated to each of this manager's directives
and describes the calling sequence, related constants, usage,
and status codes.
@subsection clock_gettime
@subheading CALLING SEQUENCE:
@example
#include <time.h>
int clock_gettime(
clockid_t clock_id,
struct timespec *tp
);
@end example
@subheading STATUS CODES:
On error, this routine returns -1 and sets errno to one of the following:
@table @b
@item EINVAL
The tp pointer parameter is invalid.
@item EINVAL
The clock_id specified is invalid.
@end table
@subheading DESCRIPTION:
@subheading NOTES:
@page
@subsection clock_settime
@subheading CALLING SEQUENCE:
@example
#include <time.h>
int clock_settime(
clockid_t clock_id,
const struct timespec *tp
);
@end example
@subheading STATUS CODES:
On error, this routine returns -1 and sets errno to one of the following:
@table @b
@item EINVAL
The tp pointer parameter is invalid.
@item EINVAL
The clock_id specified is invalid.
@item EINVAL
The contents of the tp structure are invalid.
@end table
@subheading DESCRIPTION:
@subheading NOTES:
@page
@subsection clock_getres
@subheading CALLING SEQUENCE:
@example
#include <time.h>
int clock_getres(
clockid_t clock_id,
struct timespec *res
);
@end example
@subheading STATUS CODES:
On error, this routine returns -1 and sets errno to one of the following:
@table @b
@item EINVAL
The res pointer parameter is invalid.
@item EINVAL
The clock_id specified is invalid.
@end table
@subheading DESCRIPTION:
@subheading NOTES:
If res is NULL, then the resolution is not returned.
@page
@subsection sleep
@subheading CALLING SEQUENCE:
@example
#include <time.h>
unsigned int sleep(
unsigned int seconds
);
@end example
@subheading STATUS CODES:
This routine returns the number of unslept seconds.
@subheading DESCRIPTION:
@subheading NOTES:
This call is interruptible by a signal.
@page
@subsection nanosleep
@subheading CALLING SEQUENCE:
@example
#include <time.h>
int nanosleep(
const struct timespec *rqtp,
struct timespec *rmtp
);
@end example
@subheading STATUS CODES:
On error, this routine returns -1 and sets errno to one of the following:
@table @b
@item EINTR
The routine was interrupted by a signal.
@item EAGAIN
The requested sleep period specified negative seconds or nanoseconds.
@item EINVAL
The requested sleep period specified an invalid number for the nanoseconds
field.
@end table
@subheading DESCRIPTION:
@subheading NOTES:
This call is interruptible by a signal.
@page
@subsection gettimeofday
@subheading CALLING SEQUENCE:
@example
#include <sys/time.h>
#include <unistd.h>
int gettimeofday(
struct timeval *tp,
struct timezone *tzp
);
@end example
@subheading STATUS CODES:
On error, this routine returns -1 and sets errno as appropriate.
@subheading DESCRIPTION:
@subheading NOTES:
Currently, the timezone information is not supported.
@page
@subsection time
@subheading CALLING SEQUENCE:
@example
#include <time.h>
int time(
time_t *tloc
);
@end example
@subheading STATUS CODES:
This routine returns the number of seconds since the Epoch.
@subheading DESCRIPTION:
@subheading NOTES:
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