posix/src/clockgettime.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Retrieves the Specified Clock Time
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2007.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <time.h>
0042 #include <errno.h>
0043
0044 #include <rtems/score/todimpl.h>
0045 #include <rtems/seterr.h>
0046
0047 /*
0048  *  14.2.1 Clocks, P1003.1b-1993, p. 263
0049  */
0050
0051 int clock_gettime(
0052   clockid_t        clock_id,
0053   struct timespec *tp
0054 )
0055 {
0056   if ( !tp )
0057     rtems_set_errno_and_return_minus_one( EINVAL );
0058
0059   if ( clock_id == CLOCK_REALTIME ) {
0060     _TOD_Get(tp);
0061     return 0;
0062   }
0063
0064 #ifdef CLOCK_MONOTONIC
0065   if ( clock_id == CLOCK_MONOTONIC ) {
0066     _Timecounter_Nanouptime( tp );
0067     return 0;
0068   }
0069 #endif
0070
0071 #ifdef _POSIX_CPUTIME
0072   if ( clock_id == CLOCK_PROCESS_CPUTIME_ID ) {
0073     _Timecounter_Nanouptime( tp );
0074     return 0;
0075   }
0076 #endif
0077
0078 #ifdef _POSIX_THREAD_CPUTIME
0079   if ( clock_id == CLOCK_THREAD_CPUTIME_ID )
0080     rtems_set_errno_and_return_minus_one( ENOSYS );
0081 #endif
0082
0083   rtems_set_errno_and_return_minus_one( EINVAL );
0084
0085   return 0;
0086 }