Switch to 64 bit file and time APIs on GNU libc for 32bit systems #3175
Commits on Aug 15, 2024
-
The gnu_time64_abi option indicates that a 32-bit arch should use 64-bit time_t and 64-bit off_t and simliar file related types. 32-bit platforms are identified by CARGO_CFG_TARGET_POINTER_WIDTH, but x86_64-unknown-linux-gnux32 is a 64-bit platform and should not use gnu_time64_abi even if it has 32-bit pointers. riscv32 is a 32-bit platform but has always used 64-bit types for time and file operations. It should not use the gnu_time64_abi The default - all relevant platforms should use 64-bit time - can be overridden by setting the RUST_LIBC_TIME_BITS environment variable to 32. It can also be set to 64 to force gnu_time64_abi, or default which is the same as leaving it unset. The last two options are mainly useful for CI flows.
-
libc-test: Set the gnu time64 preprocessor symbols for all ptr32
Set _TIME_BITS=64 and _FILE_OFFSET_BITS=64 preprocessor symbols for the C test code as for building the code.
-
gnu: Handle basic file and time types for 32bit systems with time64
Set the basic types correctly for gnu_time64_abi (_TIME_BITS=64 and _FILE_OFFSET_BITS=64).
-
gnu: Use _TIME_BITS and _FILE_OFFSET_BITS=64 versions of glibc symbols
Set the link names of relevant symbols to use be the same as when a C program is built against GNU libc with -D_TIME_BITS=64 and -D_FILE_OFFSET_BITS=64.
-
linux: Set SO_TIMESTAMP* and SO_RCVTIMEO and SO_SNDTIMEO
The actual values may be different on 32bit archs and glibc with 64-bit time.
-
-
gnu: Update F_SETLK and F_SETLKW for 64-bit time
Also add the F_[SG]ET*64 constants.
-
-
gnu: Handle timeval.tv_usec for glibc 64-bit time_t
For 64 bit time on 32 bit linux glibc timeval.tv_usec is actually __suseconds64_t (64 bits) while suseconds_t is still 32 bits.
-
-
-
-
-
-
gnu: Update struct timespec for _TIME_BITS=64
Big-endian platforms wants 32 bits of padding before tv_nsec, little-endian after. GNU libc always uses long for tv_nsec.
-
gnu: Move struct timex to gnu/b64 and gnu/b32/time*.rs
Do not use gnu/b32/time*.rs for riscv32 and sparc. Add timex to gnu/b32/(riscv32|sparc)/mod.rs instead.
-
gnu: Update the stat* structs for 64-bit time
Move the stat struct from gnu/b32/mod.rs to gnu/b32/time*.rs For arm, mips, powerpc, riscv32, and x86, move stat64 to time32.rs and add an stat64 = stat alias to time64.rs. For sparc, do the same for statfs64 and statvfs64.
-
full_ci: Test with various _TIME_BITS settings where relevant
In Linux Tier1, run the tests for i686-unknown-linux-gnu with RUST_LIBC_TIME_BITS set to 32, 64, and default. In Linux Tier2, run the tests for arm-unknown-linux-gnueabihf and powerpc-unknown-linux-gnu with RUST_LIBC_TIME_BITS set to 32, 64, and default. Use RUST_LIBC_TIME_BITS=defaults for the other platforms. In Build Channels Linux, build the relevant platforms with RUST_LIBC_TIME_BITS unset and set to 32 and 64.
