1/* Copyright (C) 1991-1994,1996-2003,2005,2006,2009 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#ifndef _SYS_TIME_H 21#define _SYS_TIME_H 1 22 23#include <features.h> 24 25#include <bits/types.h> 26#define __need_time_t 27#include <time.h> 28#define __need_timeval 29#include <bits/time.h> 30 31#include <sys/select.h> 32 33#ifndef __suseconds_t_defined 34typedef __suseconds_t suseconds_t; 35# define __suseconds_t_defined 36#endif 37 38 39__BEGIN_DECLS 40 41#ifdef __USE_GNU 42/* Macros for converting between `struct timeval' and `struct timespec'. */ 43# define TIMEVAL_TO_TIMESPEC(tv, ts) { \ 44 (ts)->tv_sec = (tv)->tv_sec; \ 45 (ts)->tv_nsec = (tv)->tv_usec * 1000; \ 46} 47# define TIMESPEC_TO_TIMEVAL(tv, ts) { \ 48 (tv)->tv_sec = (ts)->tv_sec; \ 49 (tv)->tv_usec = (ts)->tv_nsec / 1000; \ 50} 51#endif 52 53 54#ifdef __USE_BSD 55/* Structure crudely representing a timezone. 56 This is obsolete and should never be used. */ 57struct timezone 58 { 59 int tz_minuteswest; /* Minutes west of GMT. */ 60 int tz_dsttime; /* Nonzero if DST is ever in effect. */ 61 }; 62 63typedef struct timezone *__restrict __timezone_ptr_t; 64#else 65typedef void *__restrict __timezone_ptr_t; 66#endif 67 68/* Get the current time of day and timezone information, 69 putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled. 70 Returns 0 on success, -1 on errors. 71 NOTE: This form of timezone information is obsolete. 72 Use the functions and variables declared in <time.h> instead. */ 73extern int gettimeofday (struct timeval *__restrict __tv, 74 __timezone_ptr_t __tz) __THROW __nonnull ((1)); 75 76#ifdef __USE_BSD 77/* Set the current time of day and timezone information. 78 This call is restricted to the super-user. */ 79extern int settimeofday (__const struct timeval *__tv, 80 __const struct timezone *__tz) 81 __THROW __nonnull ((1)); 82 83/* Adjust the current time of day by the amount in DELTA. 84 If OLDDELTA is not NULL, it is filled in with the amount 85 of time adjustment remaining to be done from the last `adjtime' call. 86 This call is restricted to the super-user. */ 87/* gracecsm */ 88#define __adjtimex(ntx) adjtimex((ntx)) 89 90extern int adjtime (__const struct timeval *__delta, 91 struct timeval *__olddelta) __THROW; 92#endif 93 94 95/* Values for the first argument to `getitimer' and `setitimer'. */ 96enum __itimer_which 97 { 98 /* Timers run in real time. */ 99 ITIMER_REAL = 0, 100#define ITIMER_REAL ITIMER_REAL 101 /* Timers run only when the process is executing. */ 102 ITIMER_VIRTUAL = 1, 103#define ITIMER_VIRTUAL ITIMER_VIRTUAL 104 /* Timers run when the process is executing and when 105 the system is executing on behalf of the process. */ 106 ITIMER_PROF = 2 107#define ITIMER_PROF ITIMER_PROF 108 }; 109 110/* Type of the second argument to `getitimer' and 111 the second and third arguments `setitimer'. */ 112struct itimerval 113 { 114 /* Value to put into `it_value' when the timer expires. */ 115 struct timeval it_interval; 116 /* Time to the next timer expiration. */ 117 struct timeval it_value; 118 }; 119 120#if defined __USE_GNU && !defined __cplusplus 121/* Use the nicer parameter type only in GNU mode and not for C++ since the 122 strict C++ rules prevent the automatic promotion. */ 123typedef enum __itimer_which __itimer_which_t; 124#else 125typedef int __itimer_which_t; 126#endif 127 128/* Set *VALUE to the current setting of timer WHICH. 129 Return 0 on success, -1 on errors. */ 130extern int getitimer (__itimer_which_t __which, 131 struct itimerval *__value) __THROW; 132 133/* Set the timer WHICH to *NEW. If OLD is not NULL, 134 set *OLD to the old value of timer WHICH. 135 Returns 0 on success, -1 on errors. */ 136extern int setitimer (__itimer_which_t __which, 137 __const struct itimerval *__restrict __new, 138 struct itimerval *__restrict __old) __THROW; 139 140/* Change the access time of FILE to TVP[0] and the modification time of 141 FILE to TVP[1]. If TVP is a null pointer, use the current time instead. 142 Returns 0 on success, -1 on errors. */ 143extern int utimes (__const char *__file, __const struct timeval __tvp[2]) 144 __THROW __nonnull ((1)); 145 146#ifdef __USE_BSD 147/* Same as `utimes', but does not follow symbolic links. */ 148extern int lutimes (__const char *__file, __const struct timeval __tvp[2]) 149 __THROW __nonnull ((1)); 150 151#if 0 152/* Same as `utimes', but takes an open file descriptor instead of a name. */ 153extern int futimes (int __fd, __const struct timeval __tvp[2]) __THROW; 154#endif 155#endif 156 157#ifdef __USE_GNU 158/* Change the access time of FILE relative to FD to TVP[0] and the 159 modification time of FILE to TVP[1]. If TVP is a null pointer, use 160 the current time instead. Returns 0 on success, -1 on errors. */ 161extern int futimesat (int __fd, __const char *__file, 162 __const struct timeval __tvp[2]) __THROW; 163#endif 164 165 166#ifdef __USE_BSD 167/* Convenience macros for operations on timevals. 168 NOTE: `timercmp' does not work for >= or <=. */ 169# define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 170# define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 171# define timercmp(a, b, CMP) \ 172 (((a)->tv_sec == (b)->tv_sec) ? \ 173 ((a)->tv_usec CMP (b)->tv_usec) : \ 174 ((a)->tv_sec CMP (b)->tv_sec)) 175# define timeradd(a, b, result) \ 176 do { \ 177 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ 178 (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \ 179 if ((result)->tv_usec >= 1000000) \ 180 { \ 181 ++(result)->tv_sec; \ 182 (result)->tv_usec -= 1000000; \ 183 } \ 184 } while (0) 185# define timersub(a, b, result) \ 186 do { \ 187 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 188 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 189 if ((result)->tv_usec < 0) { \ 190 --(result)->tv_sec; \ 191 (result)->tv_usec += 1000000; \ 192 } \ 193 } while (0) 194#endif /* BSD */ 195 196__END_DECLS 197 198#endif /* sys/time.h */ 199