[newlib-cygwin] Ensure nanosleep(2) never returns negative rem
Corinna Vinschen
corinna@sourceware.org
Thu Jul 22 07:58:58 GMT 2021
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=51a297bcbf05f332462a577563234062660e6384
commit 51a297bcbf05f332462a577563234062660e6384
Author: David Allsopp <david.allsopp@metastack.com>
Date: Tue Jul 20 16:07:00 2021 +0100
Ensure nanosleep(2) never returns negative rem
It appears to be the case that NtQueryTimer can return a negative time
remaining for an unsignalled timer. The value appears to be less than
the timer resolution.
Signed-off-by: David Allsopp <david.allsopp@metastack.com>
Diff:
---
winsup/cygwin/cygwait.cc | 6 ++++--
winsup/cygwin/release/3.2.1 | 4 ++++
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/cygwait.cc b/winsup/cygwin/cygwait.cc
index 1d6c7c9cc..dbbe1db6e 100644
--- a/winsup/cygwin/cygwait.cc
+++ b/winsup/cygwin/cygwait.cc
@@ -104,8 +104,10 @@ cygwait (HANDLE object, PLARGE_INTEGER timeout, unsigned mask)
sizeof tbi, NULL);
/* if timer expired, TimeRemaining is negative and represents the
system uptime when signalled */
- if (timeout->QuadPart < 0LL)
- timeout->QuadPart = tbi.SignalState ? 0LL : tbi.TimeRemaining.QuadPart;
+ if (timeout->QuadPart < 0LL) {
+ timeout->QuadPart = tbi.SignalState || tbi.TimeRemaining.QuadPart < 0LL
+ ? 0LL : tbi.TimeRemaining.QuadPart;
+ }
NtCancelTimer (_my_tls.locals.cw_timer, NULL);
}
diff --git a/winsup/cygwin/release/3.2.1 b/winsup/cygwin/release/3.2.1
index 4f4db622a..2a339718c 100644
--- a/winsup/cygwin/release/3.2.1
+++ b/winsup/cygwin/release/3.2.1
@@ -44,3 +44,7 @@ Bug Fixes
AF_UNSPEC. As specified by POSIX and Linux, this is allowed on
datagram sockets, and its effect is to reset the socket's peer
address.
+
+- Fix nanosleep(2) returning negative rem. NtQueryTimer appears to be able to
+ return a negative remaining time (less than the timer resolution) for
+ unsignalled timers.
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