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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 8727b5e7f0..b066c75db3 100644 --- a/NEWS +++ b/NEWS @@ -34,6 +34,30 @@ Deprecated and removed features, and other changes affecting compatibility: binaries and it has been removed from <time.h> header. This function has been deprecated in favor of clock_settime. +* The settimeofday function can still be used to set a system-wide time + zone when the operating system supports it. This is because the Linux + kernel reused the API, on some architectures, to describe a system-wide + time-zone-like offset between the software clock maintained by the kernel, + and the "RTC" clock that keeps time when the system is shut down. + + However, to reduce the odds of this offset being set by accident, + settimeofday can no longer be used to set the time and the offset + simultaneously. If both of its two arguments are non-null, the call + will fail (setting errno to EINVAL). + + Callers attempting to set this offset should also be prepared for the call + to fail and set errno to ENOSYS; this already happens on the Hurd and on + some Linux architectures. The Linux kernel maintainers are discussing a + more principled replacement for the reused API. After a replacement + becomes available, we will change settimeofday to fail with ENOSYS on all + platforms when its 'tzp' argument is not a null pointer. + + Note that settimeofday itself is obsolescent according to POSIX. + Programs that set the system time should use clock_settime and/or + the adjtime family of functions instead. We may also cease to make + settimeofday available to newly linked binaries after there is a + replacement for Linux's time-zone-like offset API. + Changes to build and runtime requirements: [Add changes to build and runtime requirements here] |