/**************************************************************************** * include/sys/time.h * * Copyright (C) 2009, 2015-2016 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. * ****************************************************************************/ #ifndef __INCLUDE_SYS_TIME_H #define __INCLUDE_SYS_TIME_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* The following are non-standard interfaces in the sense that they are not * in POSIX.1-2001 nor are they specified at OpenGroup.org. These interfaces * are present on most BSD derivatives, however, including Linux. */ /* void timeradd(FAR struct timeval *a, FAR struct timeval *b, * FAR struct timeval *res); */ #define timeradd(tvp, uvp, vvp) \ do \ { \ (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \ (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \ if ((vvp)->tv_usec >= 1000000) \ { \ (vvp)->tv_sec++; \ (vvp)->tv_usec -= 1000000; \ } \ } \ while (0) /* void timersub(FAR struct timeval *a, FAR struct timeval *b, * FAR struct timeval *res); */ #define timersub(tvp, uvp, vvp) \ do \ { \     (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \     (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \     if ((vvp)->tv_usec < 0) \ { \       (vvp)->tv_sec--; \       (vvp)->tv_usec += 1000000; \     } \ } \ while (0) /* void timerclear(FAR struct timeval *tvp); */ #define timerclear(tvp) \ do \ { \ (tvp)->tv_sec = 0; \ (tvp)->tv_usec = 0; \ } \ while (0) /* int timerisset(FAR struct timeval *tvp); */ #define timerisset(tvp) \ ((tvp)->tv_sec != 0 || (tvp)->tv_usec != 0) /* int timercmp(FAR struct timeval *a, FAR struct timeval *b, CMP); */ #define timercmp(tvp, uvp, cmp) \ (((tvp)->tv_sec == (uvp)->tv_sec) ? \ ((tvp)->tv_usec cmp (uvp)->tv_usec) : \ ((tvp)->tv_sec cmp (uvp)->tv_sec)) /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* struct timeval represents time as seconds plus microseconds */ struct timeval { time_t tv_sec; /* Seconds */ long tv_usec; /* Microseconds */ }; /* The use of the struct timezone is obsolete; the tz argument should * normally be specified as NULL (and is ignored in any event). */ struct timezone { int tz_minuteswest; /* Minutes west of Greenwich */ int tz_dsttime; /* Type of DST correction */ }; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Name: gettimeofday * * Description: * Get the current time * * Conforming to SVr4, 4.3BSD. POSIX.1-2001 describes gettimeofday(). * POSIX.1-2008 marks gettimeofday() as obsolete, recommending the use of * clock_gettime(2) instead. * * NuttX implements gettimeofday() as a thin layer around clock_gettime(); * * Input Parameters: * tv - The location to return the current time * tz - Ignored * * Returned value: * Zero (OK) on success; -1 is returned on failure with the errno variable * set appropriately. * ****************************************************************************/ int gettimeofday(FAR struct timeval *tv, FAR struct timezone *tz); /**************************************************************************** * Name: settimeofday * * Description: * Set the current time * * Conforming to SVr4, 4.3BSD. POSIX.1-2001 describes gettimeofday() but * not settimeofday(). * * NuttX implements settimeofday() as a thin layer around clock_settime(); * * Input Parameters: * tv - The net to time to be set * tz - Ignored * * Returned value: * Zero (OK) on success; -1 is returned on failure with the errno variable * set appropriately. * ****************************************************************************/ int settimeofday(FAR const struct timeval *tv, FAR struct timezone *tz); /**************************************************************************** * Name: adjtime * * Description: * The adjtime() function gradually adjusts the system clock (as returned * by gettimeofday(2)). The amount of time by which the clock is to be * adjusted is specified in the structure pointed to by delta. * * This structure has the following form: * * struct timeval * { * time_t tv_sec; (seconds) * suseconds_t tv_usec; (microseconds) * }; * * If the adjustment in delta is positive, then the system clock is * speeded up by some small percentage (i.e., by adding a small amount of * time to the clock value in each second) until the adjustment has been * completed. If the adjustment in delta is negative, then the clock is * slowed down in a similar fashion. * * If a clock adjustment from an earlier adjtime() call is already in * progress at the time of a later adjtime() call, and delta is not NULL * for the later call, then the earlier adjustment is stopped, but any * already completed part of that adjustment is not undone. * * If olddelta is not NULL, then the buffer that it points to is used to * return the amount of time remaining from any previous adjustment that * has not yet been completed. * * NOTE: This is not a POSIX interface but derives from 4.3BSD, System V. * It is also supported for Linux compatibility. * ****************************************************************************/ #ifdef CONFIG_CLOCK_TIMEKEEPING int adjtime(FAR const struct timeval *delta, FAR struct timeval *olddelta); #endif #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __INCLUDE_SYS_TIME_H */