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nanosleep truncated on 64 bit Linux by 292 billion years

From: Pádraig Brady
Subject: nanosleep truncated on 64 bit Linux by 292 billion years
Date: Mon, 27 Oct 2014 04:01:44 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2

I noticed that nanosleep() on 64 bit, "only" supports 292 years,
rather than the full potential 292 billion years with 64 bit time_t, due to:

Attached is a program from Paul Eggert that illustrates the bug.
Running this program on a buggy host outputs something like this:

  Setting alarm for 1 second from now ...
  Sleeping for 9223372036854775807.999999999 seconds...
  After alarm sent off, remaining time is 9223357678.462306617 seconds;
  i.e., nanosleep claimed that it slept for about 293079448610.606445 years.

Gnulib-using applications have a workaround for this bug, but a workaround
shouldn't be necessary.  For what it's worth, the bug is fixed in Solaris 11 
though it's present in Solaris 10 (64-bit sparc).


Attachment: nanosleep-bug.c
Description: Text document

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