rlim_t is at least as large as long, so we don't need the
extra variable to keep the intermediate step. We don't
need the volatile either.
The code was tested on i386 and amd64.
Suggested by: bde
X-MFC with: r278803
The existing implementation had a broken comparison that could
overflow and return confusing values. Replace this with a check
that avoids the overflow before it happens.
Consistently return a maximum value also on the case of negative
arguments since negative is considered an overflow and means
infinity for our current setrlimit().
New revamped version is credited to Bruce Evans.
CID: 1199295
MFC after: 1 week
The existing implementation had a broken comparison that could overflow.
Replace this with a check that avoids the overflow before it happens.
Consistently return a maximum value also on the case of negative
arguments since negative is considered an overflow and means
infinity for our current setrlimit().
Discussed with: bde (rather extensively)
CID: 1199295
MFC after: 1 week
