about summary refs log tree commit diff
path: root/README
diff options
context:
space:
mode:
authorAlbert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>2018-12-20 22:14:08 +0100
committerAlbert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>2018-12-20 22:16:55 +0100
commitac253355baf6ce73a92c4f4d94a32b65859fc634 (patch)
tree729d6687bb85fce009bab970220df57d2d438a33 /README
parentab4169313cdb15d688242609aef879fc5121356e (diff)
downloadglibc-ac253355baf6ce73a92c4f4d94a32b65859fc634.tar.gz
glibc-ac253355baf6ce73a92c4f4d94a32b65859fc634.tar.xz
glibc-ac253355baf6ce73a92c4f4d94a32b65859fc634.zip
Y2038: make __difftime compatible with 64-bit time
Provide a 64-bit-time version of __difftime (but do not assume
__time64_t is a signed int so that Gnulib can reuse the code)
and make the 32-bit version a wrapper of it.

Current difftime expects two time_t arguments and returns a
double. To preserve source-code compatibility, its 64-bit-time
equivalent expects two __time64_t arguments but still returns
a double.

This patch was tested by running 'make check' on branch
master then applying this patch and its two predecessors and
running 'make check' again, and checking that both 'make check'
yield identical results. This was done on x86_64-linux-gnu and
i686-linux-gnu.

This patch was also functionally tested with an ad hoc userland
C program which checks the result of difftime for various pairs
of 32-bit and, for 64-bit builds, of 64-bit time_t values too.
The program was built and run against a glibc with and without
the patch, and the results compared to ensure the patch does
not change the behavior of difftime.

* include/time.h (__difftime64): Add.
* time/difftime.c (subtract): convert to 64-bit time.
* time/difftime.c (__difftime64): Add.
* time/difftime.c (__difftime): Wrap around __difftime64.
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions