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Bugfix: Calculate nsec in nmsleep correctly

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The old algorithm (msecs * 1000000) - (sec / 1000000000) gets total nsec,
including seconds, since the sec/1e9 should be multiplying. It's also
vulnerable to easy overflows. Using ldiv gets the quotient and remainder
in a single operation (at least on x86) and avoids overflow.
This commit is contained in:
Luke Dashjr 2012-07-11 20:10:52 +00:00
parent bc0b14063f
commit 9c648c1749
1 changed files with 4 additions and 2 deletions
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6
util.c
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@ -694,9 +694,11 @@ void nmsleep(unsigned int msecs)
{
struct timespec twait, tleft;
int ret;
ldiv_t d;
tleft.tv_sec = msecs / 1000;
tleft.tv_nsec = (uint64_t)(msecs * 1000000) - (uint64_t)(twait.tv_sec / 1000000000);
d = ldiv(msecs, 1000);
tleft.tv_sec = d.quot;
tleft.tv_nsec = d.rem * 1000000;
do {
twait.tv_sec = tleft.tv_sec;
twait.tv_nsec = tleft.tv_nsec;