Interesting - I have been able to reproduce the bug when compiling like so:
make CROSS_COMPILE=mips-linux-gnu- TARGET_ARCH=mips KERNEL_HEADERS=~/linux-headers-4.19.325/include/ -j4 clean
make CROSS_COMPILE=mips-linux-gnu- TARGET_ARCH=mips KERNEL_HEADERS=~/linux-headers-4.19.325/include/ -j4

Note that this also reproduces in the existing toolchain at https://toolchains.bootlin.com/downloads/releases/toolchains/mips32/tarballs/mips32--uclibc--stable-2024.05-1.tar.xz (this is actually how I encountered the bug).

Dmitriy Chestnykh wrote:
> Cannot reproduce it with the latest uclibc.
> Config in attachment
>
>
> сб, 21 дек. 2024 г. в 14:20, Nadav Tasher <tashernadav@gmail.com>:
>
> > Hi Waldemar,
> >
> > The following snippet should do it when compiled statically for MIPS32
> > and emulated using qemu-user-static:
> >
> > #include <time.h>
> > #include <stddef.h>
> > #include <unistd.h>
> >
> > int main(int argc, char **argv) {
> >
> >         time_t start = time(NULL);
> >         sleep(2);
> >         time_t end = time(NULL);
> >
> >         return end != start;
> > }
> >
> > When I strace the resulting binary, I saw:
> > [pid 2271212] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> > [pid 2271212] clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=0, tv_nsec=2},
> > 0x7ffca592a250) = 0
> > [pid 2271212] brk(0x611d0d49b000)       = 0x611d0d49b000
> > [pid 2271212] exit_group(1)             = ?
> >
> > But I expected to see:
> > [pid 2271212] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> > [pid 2271212] clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=2, tv_nsec=0},
> > 0x7ffca592a250) = 0
> > [pid 2271212] brk(0x611d0d49b000)       = 0x611d0d49b000
> > [pid 2271212] exit_group(1)             = ?
> >
> > kind regards
> >  Nadav
> >
> > Waldemar Brodkorb wrote,
> > > Hi Nadav,
> > >
> > > do you have some test code showing the issue?
> > >
> > > best regards
> > >  Waldemar
> > >
> > > Nadav Tasher wrote,
> > >
> > > > Without this change `timespec` is too large for the `clock_nanosleep`
> > syscall,
> > > > which translates to sleep(0) on 32bit systems when TIME64 is enabled
> > (the default).
> > > >
> > > > Tested on MIPS.
> > > >
> > > > Signed-off-by: Nadav Tasher <tashernadav@gmail.com>
> > > > ---
> > > >  include/time.h | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/include/time.h b/include/time.h
> > > > index 1a1408990..25dfb9e2e 100644
> > > > --- a/include/time.h
> > > > +++ b/include/time.h
> > > > @@ -118,7 +118,7 @@ typedef __timer_t timer_t;
> > > >     has nanoseconds instead of microseconds.  */
> > > >  struct timespec
> > > >    {
> > > > -    __time_t tv_sec;               /* Seconds.  */
> > > > +    int tv_sec;            /* Seconds.  */
> > > >      long int tv_nsec;              /* Nanoseconds.  */
> > > >    };
> > > >
> > > > --
> > > > 2.34.1
> > > >
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