b7b7452f2
Alistair Francis
2019-10-08
Subject
date: Use 64 prefix syscall if we have to
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Commit Diff GitHub →
coreutils/date.c+9 -2
| @@ -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 | |