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4a626d0a PA |
1 | /* Provide gettimeofday for systems that don't have it or for which it's broken. |
2 | ||
3 | Copyright (C) 2001-2003, 2005-2007, 2009-2015 Free Software Foundation, Inc. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This program 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 | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* written by Jim Meyering */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | /* Specification. */ | |
23 | #include <sys/time.h> | |
24 | ||
25 | #include <time.h> | |
26 | ||
27 | #if HAVE_SYS_TIMEB_H | |
28 | # include <sys/timeb.h> | |
29 | #endif | |
30 | ||
31 | #if GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME | |
32 | ||
33 | /* Work around the bug in some systems whereby gettimeofday clobbers | |
34 | the static buffer that localtime uses for its return value. The | |
35 | gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has | |
36 | this problem. The tzset replacement is necessary for at least | |
37 | Solaris 2.5, 2.5.1, and 2.6. */ | |
38 | ||
39 | static struct tm tm_zero_buffer; | |
40 | static struct tm *localtime_buffer_addr = &tm_zero_buffer; | |
41 | ||
42 | # undef localtime | |
43 | extern struct tm *localtime (time_t const *); | |
44 | ||
45 | # undef gmtime | |
46 | extern struct tm *gmtime (time_t const *); | |
47 | ||
48 | /* This is a wrapper for localtime. It is used only on systems for which | |
49 | gettimeofday clobbers the static buffer used for localtime's result. | |
50 | ||
51 | On the first call, record the address of the static buffer that | |
52 | localtime uses for its result. */ | |
53 | ||
54 | struct tm * | |
55 | rpl_localtime (time_t const *timep) | |
56 | { | |
57 | struct tm *tm = localtime (timep); | |
58 | ||
59 | if (localtime_buffer_addr == &tm_zero_buffer) | |
60 | localtime_buffer_addr = tm; | |
61 | ||
62 | return tm; | |
63 | } | |
64 | ||
65 | /* Same as above, since gmtime and localtime use the same buffer. */ | |
66 | struct tm * | |
67 | rpl_gmtime (time_t const *timep) | |
68 | { | |
69 | struct tm *tm = gmtime (timep); | |
70 | ||
71 | if (localtime_buffer_addr == &tm_zero_buffer) | |
72 | localtime_buffer_addr = tm; | |
73 | ||
74 | return tm; | |
75 | } | |
76 | ||
77 | #endif /* GETTIMEOFDAY_CLOBBERS_LOCALTIME || TZSET_CLOBBERS_LOCALTIME */ | |
78 | ||
79 | #if TZSET_CLOBBERS_LOCALTIME | |
80 | ||
81 | # undef tzset | |
82 | extern void tzset (void); | |
83 | ||
84 | /* This is a wrapper for tzset, for systems on which tzset may clobber | |
85 | the static buffer used for localtime's result. */ | |
86 | void | |
87 | rpl_tzset (void) | |
88 | { | |
89 | /* Save and restore the contents of the buffer used for localtime's | |
90 | result around the call to tzset. */ | |
91 | struct tm save = *localtime_buffer_addr; | |
92 | tzset (); | |
93 | *localtime_buffer_addr = save; | |
94 | } | |
95 | #endif | |
96 | ||
97 | /* This is a wrapper for gettimeofday. It is used only on systems | |
98 | that lack this function, or whose implementation of this function | |
99 | causes problems. */ | |
100 | ||
101 | int | |
102 | gettimeofday (struct timeval *restrict tv, void *restrict tz) | |
103 | { | |
104 | #undef gettimeofday | |
105 | #if HAVE_GETTIMEOFDAY | |
106 | # if GETTIMEOFDAY_CLOBBERS_LOCALTIME | |
107 | /* Save and restore the contents of the buffer used for localtime's | |
108 | result around the call to gettimeofday. */ | |
109 | struct tm save = *localtime_buffer_addr; | |
110 | # endif | |
111 | ||
112 | # if defined timeval /* 'struct timeval' overridden by gnulib? */ | |
113 | # undef timeval | |
114 | struct timeval otv; | |
115 | int result = gettimeofday (&otv, (struct timezone *) tz); | |
116 | if (result == 0) | |
117 | { | |
118 | tv->tv_sec = otv.tv_sec; | |
119 | tv->tv_usec = otv.tv_usec; | |
120 | } | |
121 | # else | |
122 | int result = gettimeofday (tv, (struct timezone *) tz); | |
123 | # endif | |
124 | ||
125 | # if GETTIMEOFDAY_CLOBBERS_LOCALTIME | |
126 | *localtime_buffer_addr = save; | |
127 | # endif | |
128 | ||
129 | return result; | |
130 | ||
131 | #else | |
132 | ||
133 | # if HAVE__FTIME | |
134 | ||
135 | struct _timeb timebuf; | |
136 | _ftime (&timebuf); | |
137 | tv->tv_sec = timebuf.time; | |
138 | tv->tv_usec = timebuf.millitm * 1000; | |
139 | ||
140 | # else | |
141 | ||
142 | # if !defined OK_TO_USE_1S_CLOCK | |
143 | # error "Only 1-second nominal clock resolution found. Is that intended?" \ | |
144 | "If so, compile with the -DOK_TO_USE_1S_CLOCK option." | |
145 | # endif | |
146 | tv->tv_sec = time (NULL); | |
147 | tv->tv_usec = 0; | |
148 | ||
149 | # endif | |
150 | ||
151 | return 0; | |
152 | ||
153 | #endif | |
154 | } |