[Bug 2055837] Re: Wrong type for timeval.tv_usec on armhf/Noble (and other failures)

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------------------------------------------------------------------------
On 2024-03-19T11:24:14+00:00 Simon Chopin wrote:

POSIX documents struct timeval as follows:

struct timeval {
    time_t      tv_sec;         /* seconds */
    suseconds_t tv_usec;        /* microseconds */
};
Since bdc4782744df73a8c0559985c54b5b6b9c7a4a74 ("y2038: Add __USE_TIME_BITS64 support for struct timeval") tv_usec can have __suseconds64_t when using 64-bit time, however suseconds_t is unconditionally typedefed to __suseconds_t.

That leads to the following:

ubuntu at mantic-armhf:~$ cat test.c
#include <sys/time.h>
#include <stdio.h>
#include <assert.h>

int main(void)
{
        struct timeval tv;
        printf("tv_usec: %d, suseconds_t: %d\n", sizeof(tv.tv_usec), sizeof(suseconds_t));
        assert(sizeof(tv.tv_usec) == sizeof(suseconds_t));
        return 0;
}
ubuntu at mantic-armhf:~$ gcc test.c && ./a.out
tv_usec: 4, suseconds_t: 4
ubuntu at mantic-armhf:~$ gcc -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 test.c && ./a.out
tv_usec: 8, suseconds_t: 4
a.out: test.c:9: main: Assertion `sizeof(tv.tv_usec) == sizeof(suseconds_t)' failed.
Aborted (core dumped)

We noticed this when running the conformance tests on Ubuntu Noble,
where we've set _TIME_BITS=64 in the default GCC flags as part of the
ongoing t64 transition.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/2055837/comments/1


** Changed in: glibc
       Status: Unknown => New

** Changed in: glibc
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/2055837

Title:
  Wrong type for timeval.tv_usec on armhf/Noble (and other failures)

Status in GLibC:
  New
Status in glibc package in Ubuntu:
  Triaged

Bug description:
  I xfailed a whole stack of the "conform" tests on armhf, which
  presumably fail because of the change in default size of time_t (and
  off_t). We should work out what is going on here before release --
  maybe leaving them xfail is appropriate but I'm not confident to say
  that at this time.

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