diff options
| author | Alistair Francis <alistair.francis@wdc.com> | 2019-09-18 09:28:49 -0700 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2019-10-08 16:31:54 +0200 |
| commit | b7b7452f292f03eefafa6fd1da9bcfc933dee15a (patch) | |
| tree | 3471a263dc7420ae024a148b3d7ab7fb00baabf6 | |
| parent | 1f1988d5256c9705a4f296ed48cdb7e463525ba4 (diff) | |
| download | busybox-b7b7452f292f03eefafa6fd1da9bcfc933dee15a.tar.gz | |
date: Use 64 prefix syscall if we have to
Some 32-bit architectures no longer have the 32-bit time_t syscalls.
Instead they have suffixed syscalls that returns a 64-bit time_t. If
the architecture doesn't have the non-suffixed syscall and is using a
64-bit time_t let's use the suffixed syscall instead.
This fixes build issues when building for RISC-V 32-bit with 5.1+ kernel
headers.
If an architecture only supports the suffixed syscalls, but is still
using a 32-bit time_t fall back to the libc call.
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | coreutils/date.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/coreutils/date.c b/coreutils/date.c index feb400430..731241536 100644 --- a/coreutils/date.c +++ b/coreutils/date.c @@ -36,7 +36,7 @@ //config:# defaults to "no": stat's nanosecond field is a bit non-portable //config:config FEATURE_DATE_NANO //config: bool "Support %[num]N nanosecond format specifier" -//config: default n # syscall(__NR_clock_gettime) +//config: default n # syscall(__NR_clock_gettime) or syscall(__NR_clock_gettime64) //config: depends on DATE //config: select PLATFORM_LINUX //config: help @@ -271,10 +271,17 @@ int date_main(int argc UNUSED_PARAM, char **argv) */ #endif } else { -#if ENABLE_FEATURE_DATE_NANO +#if ENABLE_FEATURE_DATE_NANO && defined(__NR_clock_gettime) /* libc has incredibly messy way of doing this, * typically requiring -lrt. We just skip all this mess */ syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts); +#elif ENABLE_FEATURE_DATE_NANO && __TIMESIZE == 64 + /* Let's only support the 64 suffix syscalls for 64-bit time_t. + * This simplifies the code for us as we don't need to convert + * between 64-bit and 32-bit. We also don't have a way to + * report overflow errors here. + */ + syscall(__NR_clock_gettime64, CLOCK_REALTIME, &ts); #else time(&ts.tv_sec); #endif |