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54   	   This is obsolete and should never be used.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