1 /* Copyright (C) 1991-1994,1996-2003,2005,2006,2009,2012 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, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_TIME_H 20 #define _SYS_TIME_H 1 21 22 #include <features.h> 23 24 #include <bits/types.h> 25 #define __need_time_t 26 #include <time.h> 27 #define __need_timeval 28 #include <bits/time.h> 29 30 #include <sys/select.h> 31 32 #ifndef __suseconds_t_defined 33 typedef __suseconds_t suseconds_t; 34 # define __suseconds_t_defined 35 #endif 36 37 38 __BEGIN_DECLS 39 40 #ifdef __USE_GNU 41 /* Macros for converting between `struct timeval' and `struct timespec'. */ 42 # define TIMEVAL_TO_TIMESPEC(tv, ts) { \ 43 (ts)->tv_sec = (tv)->tv_sec; \ 44 (ts)->tv_nsec = (tv)->tv_usec * 1000; \ 45 } 46 # define TIMESPEC_TO_TIMEVAL(tv, ts) { \ 47 (tv)->tv_sec = (ts)->tv_sec; \ 48 (tv)->tv_usec = (ts)->tv_nsec / 1000; \ 49 } 50 #endif 51 52 53 #ifdef __USE_BSD 54 /* Structure crudely representing a timezone. 55 This is obsolete and should never be used. */ 56 struct timezone 57 { 58 int tz_minuteswest; /* Minutes west of GMT. */ 59 int tz_dsttime; /* Nonzero if DST is ever in effect. */ 60 }; 61 62 typedef struct timezone *__restrict __timezone_ptr_t; 63 #else 64 typedef void *__restrict __timezone_ptr_t; 65 #endif 66 67 /* Get the current time of day and timezone information, 68 putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled. 69 Returns 0 on success, -1 on errors. 70 NOTE: This form of timezone information is obsolete. 71 Use the functions and variables declared in <time.h> instead. */ 72 extern int gettimeofday (struct timeval *__restrict __tv, 73 __timezone_ptr_t __tz) __THROW __nonnull ((1)); 74 75 #ifdef __USE_BSD 76 /* Set the current time of day and timezone information. 77 This call is restricted to the super-user. */ 78 extern int settimeofday (const struct timeval *__tv, 79 const struct timezone *__tz) 80 __THROW; 81 82 /* Adjust the current time of day by the amount in DELTA. 83 If OLDDELTA is not NULL, it is filled in with the amount 84 of time adjustment remaining to be done from the last `adjtime' call. 85 This call is restricted to the super-user. */ 86 extern int adjtime (const struct timeval *__delta, 87 struct timeval *__olddelta) __THROW; 88 #endif 89 90 91 /* Values for the first argument to `getitimer' and `setitimer'. */ 92 enum __itimer_which 93 { 94 /* Timers run in real time. */ 95 ITIMER_REAL = 0, 96 #define ITIMER_REAL ITIMER_REAL 97 /* Timers run only when the process is executing. */ 98 ITIMER_VIRTUAL = 1, 99 #define ITIMER_VIRTUAL ITIMER_VIRTUAL 100 /* Timers run when the process is executing and when 101 the system is executing on behalf of the process. */ 102 ITIMER_PROF = 2 103 #define ITIMER_PROF ITIMER_PROF 104 }; 105 106 /* Type of the second argument to `getitimer' and 107 the second and third arguments `setitimer'. */ 108 struct itimerval 109 { 110 /* Value to put into `it_value' when the timer expires. */ 111 struct timeval it_interval; 112 /* Time to the next timer expiration. */ 113 struct timeval it_value; 114 }; 115 116 #if defined __USE_GNU && !defined __cplusplus 117 /* Use the nicer parameter type only in GNU mode and not for C++ since the 118 strict C++ rules prevent the automatic promotion. */ 119 typedef enum __itimer_which __itimer_which_t; 120 #else 121 typedef int __itimer_which_t; 122 #endif 123 124 /* Set *VALUE to the current setting of timer WHICH. 125 Return 0 on success, -1 on errors. */ 126 extern int getitimer (__itimer_which_t __which, 127 struct itimerval *__value) __THROW; 128 129 /* Set the timer WHICH to *NEW. If OLD is not NULL, 130 set *OLD to the old value of timer WHICH. 131 Returns 0 on success, -1 on errors. */ 132 extern int setitimer (__itimer_which_t __which, 133 const struct itimerval *__restrict __new, 134 struct itimerval *__restrict __old) __THROW; 135 136 /* Change the access time of FILE to TVP[0] and the modification time of 137 FILE to TVP[1]. If TVP is a null pointer, use the current time instead. 138 Returns 0 on success, -1 on errors. */ 139 extern int utimes (const char *__file, const struct timeval __tvp[2]) 140 __THROW __nonnull ((1)); 141 142 #ifdef __USE_BSD 143 /* Same as `utimes', but does not follow symbolic links. */ 144 extern int lutimes (const char *__file, const struct timeval __tvp[2]) 145 __THROW __nonnull ((1)); 146 147 /* Same as `utimes', but takes an open file descriptor instead of a name. */ 148 extern int futimes (int __fd, const struct timeval __tvp[2]) __THROW; 149 #endif 150 151 #ifdef __USE_GNU 152 /* Change the access time of FILE relative to FD to TVP[0] and the 153 modification time of FILE to TVP[1]. If TVP is a null pointer, use 154 the current time instead. Returns 0 on success, -1 on errors. */ 155 extern int futimesat (int __fd, const char *__file, 156 const struct timeval __tvp[2]) __THROW; 157 #endif 158 159 160 #ifdef __USE_BSD 161 /* Convenience macros for operations on timevals. 162 NOTE: `timercmp' does not work for >= or <=. */ 163 # define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 164 # define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 165 # define timercmp(a, b, CMP) \ 166 (((a)->tv_sec == (b)->tv_sec) ? \ 167 ((a)->tv_usec CMP (b)->tv_usec) : \ 168 ((a)->tv_sec CMP (b)->tv_sec)) 169 # define timeradd(a, b, result) \ 170 do { \ 171 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ 172 (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \ 173 if ((result)->tv_usec >= 1000000) \ 174 { \ 175 ++(result)->tv_sec; \ 176 (result)->tv_usec -= 1000000; \ 177 } \ 178 } while (0) 179 # define timersub(a, b, result) \ 180 do { \ 181 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 182 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 183 if ((result)->tv_usec < 0) { \ 184 --(result)->tv_sec; \ 185 (result)->tv_usec += 1000000; \ 186 } \ 187 } while (0) 188 #endif /* BSD */ 189 190 __END_DECLS 191 192 #endif /* sys/time.h */ 193