diff options
Diffstat (limited to 'nuttx/sched/clock_getres.c')
-rw-r--r-- | nuttx/sched/clock_getres.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/nuttx/sched/clock_getres.c b/nuttx/sched/clock_getres.c new file mode 100644 index 000000000..a76b14ab6 --- /dev/null +++ b/nuttx/sched/clock_getres.c @@ -0,0 +1,121 @@ +/************************************************************************ + * sched/clock_getres.c + * + * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************************/ + +/************************************************************************ + * Included Files + ************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <time.h> +#include <errno.h> +#include <debug.h> + +#include "clock_internal.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Private Function Prototypes + ************************************************************************/ + +/********************************************************************** + * Public Constant Data + **********************************************************************/ + +/************************************************************************ + * Public Variables + ************************************************************************/ + +/********************************************************************** + * Private Variables + **********************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: clock_getres + * + * Description: + * Clock Functions based on POSIX APIs + * + ************************************************************************/ + +int clock_getres(clockid_t clock_id, struct timespec *res) +{ + uint32_t time_res; + int ret = OK; + + sdbg("clock_id=%d\n", clock_id); + + /* Only CLOCK_REALTIME is supported */ + + if (clock_id != CLOCK_REALTIME) + { + sdbg("Returning ERROR\n"); + set_errno(EINVAL); + ret = ERROR; + } + else + { + /* Get the clock resolution in nanoseconds */ + + time_res = MSEC_PER_TICK * NSEC_PER_MSEC; + + /* And return this as a timespec. */ + + res->tv_sec = 0; + res->tv_nsec = time_res; + + sdbg("Returning res=(%d,%d) time_res=%d\n", + (int)res->tv_sec, (int)res->tv_nsec, + (int)time_res); + } + + return ret; +} |