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 34 typedef __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tv_nsec / 1000; \ 50 } 51 #endif 52 53 54 #ifdef __USE_BSD 55 /* Structure crudely representing a timezone. 56 This is obsolete and should never be used. */ 57 struct timezone 58 { 59 int tz_minuteswest; /* Minutes west of GMT. */ 60 int tz_dsttime; /* Nonzero if DST is ever in effect. */ 61 }; 62 63 typedef struct timezone *__restrict __timezone_ptr_t; 64 #else 65 typedef 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 If TZ is NULL, *TZ is not filled. 70 Returns 0 on success, -1 on errors. 71 NOTE: This form of timezone information is obsolete. 72 Use the functions and variables declared in 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. */ 73 extern 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. */ 79 extern 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 extern int adjtime (__const struct timeval *__delta, 88 struct timeval *__olddelta) __THROW; 89 #endif 90 91 92 /* Values for the first argument to `getitimer' and `setitimer'. */ 93 enum __itimer_which 94 { 95 /* Timers run in real time. */ 96 ITIMER_REAL = 0, 97 #define ITIMER_REAL ITIMER_REAL 98 /* Timers run only when the process is executing. */ 99 ITIMER_VIRTUAL = 1, 100 #define ITIMER_VIRTUAL ITIMER_VIRTUAL 101 /* Timers run when the process is executing and when 102 the system is executing on behalf of the process. */ 103 ITIMER_PROF = 2 104 #define ITIMER_PROF ITIMER_PROF 105 }; 106 107 /* Type of the second argument to `getitimer' and 108 the second and third arguments `setitimer'. */ 109 struct itimerval 110 { 111 /* Value to put into `it_value' when the timer expires. */ 112 struct timeval it_interval; 113 /* Time to the next timer expiration. */ 114 struct timeval it_value; 115 }; 116 117 #if defined __USE_GNU && !defined __cplusplus 118 /* Use the nicer parameter type only in GNU mode and not for C++ since the 119 strict C++ rules prevent the automatic promotion. */ 120 typedef enum __itimer_which __itimer_which_t; 121 #else 122 typedef int __itimer_which_t; 123 #endif 124 125 /* Set *VALUE to the current setting of timer WHICH. 126 Return 0 on success, -1 on errors. */ 127 extern int getitimer (__itimer_which_t __which, 128 struct itimerval *__value) __THROW; 129 130 /* Set the timer WHICH to *NEW. If OLD is not NULL, 131 set *OLD to the old value of timer WHICH. 132 Returns 0 on success, -1 on errors. */ 133 extern int setitimer (__itimer_which_t __which, 134 __const struct itimerval *__restrict __new, 135 struct itimerval *__restrict __old) __THROW; 136 137 /* Change the access time of FILE to TVP[0] and the modification time of 138 FILE to TVP[1]. If TVP is a null pointer, use the current time instead. 139 Returns 0 on success, -1 on errors. */ 140 extern int utimes (__const char *__file, __const struct timeval __tvp[2]) 141 __THROW __nonnull ((1)); 142 143 #ifdef __USE_BSD 144 /* Same as `utimes', but does not follow symbolic links. */ 145 extern int lutimes (__const char *__file, __const struct timeval __tvp[2]) 146 __THROW __nonnull ((1)); 147 148 /* Same as `utimes', but takes an open file descriptor instead of a name. */ 149 extern int futimes (int __fd, __const struct timeval __tvp[2]) __THROW; 150 #endif 151 152 #ifdef __USE_GNU 153 /* Change the access time of FILE relative to FD to TVP[0] and the 154 modification time of FILE to TVP[1]. If TVP is a null pointer, use 155 the current time instead. Returns 0 on success, -1 on errors. */ 156 extern int futimesat (int __fd, __const char *__file, 157 __const struct timeval __tvp[2]) __THROW; 158 #endif 159 160 161 #ifdef __USE_BSD 162 /* Convenience macros for operations on timevals. 163 NOTE: `timercmp' does not work for >= or <=. */ 164 # define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 165 # define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 166 # define timercmp(a, b, CMP) \ 167 (((a)->tv_sec == (b)->tv_sec) ? \ 168 ((a)->tv_usec CMP (b)->tv_usec) : \ 169 ((a)->tv_sec CMP (b)->tv_sec)) 170 # define timeradd(a, b, result) \ 171 do { \ 172 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ 173 (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \ 174 if ((result)->tv_usec >= 1000000) \ 175 { \ 176 ++(result)->tv_sec; \ 177 (result)->tv_usec -= 1000000; \ 178 } \ 179 } while (0) 180 # define timersub(a, b, result) \ 181 do { \ 182 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 183 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 184 if ((result)->tv_usec < 0) { \ 185 --(result)->tv_sec; \ 186 (result)->tv_usec += 1000000; \ 187 } \ 188 } while (0) 189 #endif /* BSD */ 190 191 __END_DECLS 192 193 #endif /* sys/time.h */ 194
