libcsupport/src/__times.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Get Process Times
0007  *  @ingroup libcsupport
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-2013.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 /*
0041  *  Needed to get the prototype for this libc helper method
0042  */
0043 #define _LIBC
0044
0045 #include <rtems.h>
0046
0047 #include <sys/times.h>
0048 #include <sys/time.h>
0049
0050 #include <string.h>
0051 #include <time.h>
0052
0053 #include <rtems/seterr.h>
0054 #include <rtems/score/todimpl.h>
0055 #include <rtems/score/timestamp.h>
0056 #include <rtems/score/threadimpl.h>
0057
0058 /**
0059  *  POSIX 1003.1b 4.5.2 - Get Process Times
0060  */
0061 clock_t _times(
0062    struct tms  *ptms
0063 )
0064 {
0065   uint32_t   tick_interval;
0066   sbintime_t uptime;
0067   sbintime_t cpu_time_used;
0068
0069   if ( !ptms )
0070     rtems_set_errno_and_return_minus_one( EFAULT );
0071
0072   tick_interval = (uint32_t)
0073     (SBT_1US * rtems_configuration_get_microseconds_per_tick());
0074
0075   ptms = memset( ptms, 0, sizeof( *ptms ) );
0076
0077   _TOD_Get_zero_based_uptime( &uptime );
0078   ptms->tms_stime = ((clock_t) uptime) / tick_interval;
0079
0080   /*
0081    *  RTEMS technically has no notion of system versus user time
0082    *  since there is no separation of OS from application tasks.
0083    *  But we can at least make a distinction between the number
0084    *  of ticks since boot and the number of ticks executed by this
0085    *  this thread.
0086    */
0087   cpu_time_used =
0088     _Thread_Get_CPU_time_used_after_last_reset( _Thread_Get_executing() );
0089   ptms->tms_utime = ((clock_t) cpu_time_used) / tick_interval;
0090
0091   return ptms->tms_stime;
0092 }
0093
0094 /**
0095  *  times() system call wrapper for _times() above.
0096  */
0097 clock_t times(
0098    struct tms  *ptms
0099 )
0100 {
0101   return _times( ptms );
0102 }
0103
0104 #if defined(RTEMS_NEWLIB)
0105
0106 #include <reent.h>
0107
0108 /**
0109  *  This is the Newlib dependent reentrant version of times().
0110  */
0111 clock_t _times_r(
0112    struct _reent *ptr RTEMS_UNUSED,
0113    struct tms  *ptms
0114 )
0115 {
0116   return _times( ptms );
0117 }
0118 #endif