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Fix clock_gettime handling

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This commit is contained in:
Matt Johnston 2014-07-28 22:48:48 +08:00
parent ac98aae160
commit ad1d48e07b
1 changed files with 35 additions and 13 deletions
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44
dbutil.c
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@ -945,22 +945,45 @@ int constant_time_memcmp(const void* a, const void *b, size_t n)
return c; return c;
} }
time_t monotonic_now() {
#if defined(__linux__) && defined(SYS_clock_gettime) #if defined(__linux__) && defined(SYS_clock_gettime)
/* CLOCK_MONOTONIC_COARSE was added in Linux 2.6.32. Probably cheaper. */ /* CLOCK_MONOTONIC_COARSE was added in Linux 2.6.32 but took a while to
reach userspace include headers */
#ifndef CLOCK_MONOTONIC_COARSE #ifndef CLOCK_MONOTONIC_COARSE
#define CLOCK_MONOTONIC_COARSE 6 #define CLOCK_MONOTONIC_COARSE 6
#endif #endif
static clockid_t clock_source = CLOCK_MONOTONIC_COARSE; static clockid_t get_linux_clock_source() {
struct timespec ts; struct timespec ts;
if (syscall(SYS_clock_gettime, CLOCK_MONOTONIC_COARSE, &ts) == 0) {
return CLOCK_MONOTONIC_COARSE;
}
if (syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &ts) == 0) {
return CLOCK_MONOTONIC;
}
return -1;
}
#endif
if (syscall(SYS_clock_gettime, clock_source, &ts) == EINVAL) { time_t monotonic_now() {
clock_source = CLOCK_MONOTONIC; #if defined(__linux__) && defined(SYS_clock_gettime)
syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &ts); static clockid_t clock_source = -2;
if (clock_source == -2) {
/* First time, find out which one works.
-1 will fall back to time() */
clock_source = get_linux_clock_source();
}
if (clock_source >= 0) {
struct timespec ts;
if (syscall(SYS_clock_gettime, clock_source, &ts) != 0) {
/* Intermittent clock failures should not happen */
dropbear_exit("Clock broke");
} }
return ts.tv_sec; return ts.tv_sec;
#elif defined(HAVE_MACH_ABSOLUTE_TIME) }
#endif /* linux clock_gettime */
#if defined(HAVE_MACH_ABSOLUTE_TIME)
/* OS X, see https://developer.apple.com/library/mac/qa/qa1398/_index.html */ /* OS X, see https://developer.apple.com/library/mac/qa/qa1398/_index.html */
static mach_timebase_info_data_t timebase_info; static mach_timebase_info_data_t timebase_info;
if (timebase_info.denom == 0) { if (timebase_info.denom == 0) {
@ -968,10 +991,9 @@ time_t monotonic_now() {
} }
return mach_absolute_time() * timebase_info.numer / timebase_info.denom return mach_absolute_time() * timebase_info.numer / timebase_info.denom
/ 1e9; / 1e9;
#else #endif /* osx mach_absolute_time */
/* Fallback for everything else - this will sometimes go backwards */ /* Fallback for everything else - this will sometimes go backwards */
return time(NULL); return time(NULL);
#endif
} }