diff options
Diffstat (limited to 'nuttx/lib/time/lib_time.c')
-rw-r--r-- | nuttx/lib/time/lib_time.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/nuttx/lib/time/lib_time.c b/nuttx/lib/time/lib_time.c new file mode 100644 index 000000000..02853132b --- /dev/null +++ b/nuttx/lib/time/lib_time.c @@ -0,0 +1,110 @@ +/**************************************************************************** + * lib/time/lib_time.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 <sys/time.h> +#include <time.h> + +#ifndef CONFIG_DISABLE_CLOCK + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: time + * + * Description: + * Get the current calendar time as a time_t object. The function returns + * this value, and if the argument is not a null pointer, the value is also + * set to the object pointed by tloc. + * + * Note that this function is just a thin wrapper around gettimeofday() + * and is provided for compatibility. gettimeofday() is the preffered way + * to obtain system time. + * + * Parameters: + * Pointer to an object of type time_t, where the time value is stored. + * Alternativelly, this parameter can be a null pointer, in which case the + * parameter is not used, but a time_t object is still returned by the + * function. + * + * Return Value: + * The current calendar time as a time_t object. If the argument is not + * a null pointer, the return value is the same as the one stored in the + * location pointed by the argument. + * + * If the function could not retrieve the calendar time, it returns a -1 + * value. + * + ****************************************************************************/ + +time_t time(time_t *tloc) +{ + struct timeval tp; + int ret; + + /* Get the current time from the system */ + + ret = gettimeofday(&tp, NULL); + if (ret == OK) + { + /* Return the seconds since the epoch */ + + if (tloc) + { + *tloc = tp.tv_sec; + } + + return tp.tv_sec; + } + + return (time_t)ERROR; +} + +#endif /* !CONFIG_DISABLE_CLOCK */ |