1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_TIME_H 19 #define _SYS_TIME_H 1 20 21 #include <features.h> 22 23 #include <bits/types.h> 24 #define __need_time_t 25 #include <time.h> 26 #define __need_timeval 27 #include <bits/time.h> 28 29 #include <sys/select.h> 30 31 #ifndef __suseconds_t_defined 32 typedef __suseconds_t suseconds_t; 33 # define __suseconds_t_defined 34 #endif 35 36 37 __BEGIN_DECLS 38 39 #ifdef __USE_GNU 40 /* Macros for converting between `struct timeval' and `struct timespec'. */ 41 # define TIMEVAL_TO_TIMESPEC(tv, ts) { \ 42 (ts)->tv_sec = (tv)->tv_sec; \ 43 (ts)->tv_nsec = (tv)->tv_usec * 1000; \ 44 } 45 # define TIMESPEC_TO_TIMEVAL(tv, ts) { \ 46 (tv)->tv_sec = (ts)->tv_sec; \ 47 (tv)->tv_usec = (ts)->tv_nsec / 1000; \ 48 } 49 #endif 50 51 52 #ifdef __USE_MISC 53 /* Structure crudely representing a timezone. 54 This is obsolete and should never be used. */ 55 struct timezone 56 { 57 int tz_minuteswest; /* Minutes west of GMT. */ 58 int tz_dsttime; /* Nonzero if DST is ever in effect. */ 59 }; 60 61 typedef struct timezone *__restrict __timezone_ptr_t; 62 #else 63 typedef void *__restrict __timezone_ptr_t; 64 #endif 65 66 /* Get the current time of day and timezone information, 67 putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled. 68 Returns 0 on success, -1 on errors. 69 NOTE: This form of timezone information is obsolete. 70 Use the functions and variables declared in <time.h> instead. */ 71 extern int gettimeofday (struct timeval *__restrict __tv, 72 __timezone_ptr_t __tz) __THROW __nonnull ((1)); 73 74 #ifdef __USE_MISC 75 /* Set the current time of day and timezone information. 76 This call is restricted to the super-user. */ 77 extern int settimeofday (const struct timeval *__tv, 78 const struct timezone *__tz) 79 __THROW; 80 81 /* Adjust the current time of day by the amount in DELTA. 82 If OLDDELTA is not NULL, it is filled in with the amount 83 of time adjustment remaining to be done from the last `adjtime' call. 84 This call is restricted to the super-user. */ 85 extern int adjtime (const struct timeval *__delta, 86 struct timeval *__olddelta) __THROW; 87 #endif 88 89 90 /* Values for the first argument to `getitimer' and `setitimer'. */ 91 enum __itimer_which 92 { 93 /* Timers run in real time. */ 94 ITIMER_REAL = 0, 95 #define ITIMER_REAL ITIMER_REAL 96 /* Timers run only when the process is executing. */ 97 ITIMER_VIRTUAL = 1, 98 #define ITIMER_VIRTUAL ITIMER_VIRTUAL 99 /* Timers run when the process is executing and when 100 the system is executing on behalf of the process. */ 101 ITIMER_PROF = 2 102 #define ITIMER_PROF ITIMER_PROF 103 }; 104 105 /* Type of the second argument to `getitimer' and 106 the second and third arguments `setitimer'. */ 107 struct itimerval 108 { 109 /* Value to put into `it_value' when the timer expires. */ 110 struct timeval it_interval; 111 /* Time to the next timer expiration. */ 112 struct timeval it_value; 113 }; 114 115 #if defined __USE_GNU && !defined __cplusplus 116 /* Use the nicer parameter type only in GNU mode and not for C++ since the 117 strict C++ rules prevent the automatic promotion. */ 118 typedef enum __itimer_which __itimer_which_t; 119 #else 120 typedef int __itimer_which_t; 121 #endif 122 123 /* Set *VALUE to the current setting of timer WHICH. 124 Return 0 on success, -1 on errors. */ 125 extern int getitimer (__itimer_which_t __which, 126 struct itimerval *__value) __THROW; 127 128 /* Set the timer WHICH to *NEW. If OLD is not NULL, 129 set *OLD to the old value of timer WHICH. 130 Returns 0 on success, -1 on errors. */ 131 extern int setitimer (__itimer_which_t __which, 132 const struct itimerval *__restrict __new, 133 struct itimerval *__restrict __old) __THROW; 134 135 /* Change the access time of FILE to TVP[0] and the modification time of 136 FILE to TVP[1]. If TVP is a null pointer, use the current time instead. 137 Returns 0 on success, -1 on errors. */ 138 extern int utimes (const char *__file, const struct timeval __tvp[2]) 139 __THROW __nonnull ((1)); 140 141 #ifdef __USE_MISC 142 /* Same as `utimes', but does not follow symbolic links. */ 143 extern int lutimes (const char *__file, const struct timeval __tvp[2]) 144 __THROW __nonnull ((1)); 145 146 /* Same as `utimes', but takes an open file descriptor instead of a name. */ 147 extern int futimes (int __fd, const struct timeval __tvp[2]) __THROW; 148 #endif 149 150 #ifdef __USE_GNU 151 /* Change the access time of FILE relative to FD to TVP[0] and the 152 modification time of FILE to TVP[1]. If TVP is a null pointer, use 153 the current time instead. Returns 0 on success, -1 on errors. */ 154 extern int futimesat (int __fd, const char *__file, 155 const struct timeval __tvp[2]) __THROW; 156 #endif 157 158 159 #ifdef __USE_MISC 160 /* Convenience macros for operations on timevals. 161 NOTE: `timercmp' does not work for >= or <=. */ 162 # define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 163 # define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 164 # define timercmp(a, b, CMP) \ 165 (((a)->tv_sec == (b)->tv_sec) ? \ 166 ((a)->tv_usec CMP (b)->tv_usec) : \ 167 ((a)->tv_sec CMP (b)->tv_sec)) 168 # define timeradd(a, b, result) \ 169 do { \ 170 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ 171 (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \ 172 if ((result)->tv_usec >= 1000000) \ 173 { \ 174 ++(result)->tv_sec; \ 175 (result)->tv_usec -= 1000000; \ 176 } \ 177 } while (0) 178 # define timersub(a, b, result) \ 179 do { \ 180 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 181 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 182 if ((result)->tv_usec < 0) { \ 183 --(result)->tv_sec; \ 184 (result)->tv_usec += 1000000; \ 185 } \ 186 } while (0) 187 #endif /* Misc. */ 188 189 __END_DECLS 190 191 #endif /* sys/time.h */ 192