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54 lines
2.1 KiB
Diff
54 lines
2.1 KiB
Diff
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From b7b7452f292f03eefafa6fd1da9bcfc933dee15a Mon Sep 17 00:00:00 2001
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From: Alistair Francis <alistair.francis@wdc.com>
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Date: Wed, 18 Sep 2019 09:28:49 -0700
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Subject: [PATCH] date: Use 64 prefix syscall if we have to
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Some 32-bit architectures no longer have the 32-bit time_t syscalls.
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Instead they have suffixed syscalls that returns a 64-bit time_t. If
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the architecture doesn't have the non-suffixed syscall and is using a
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64-bit time_t let's use the suffixed syscall instead.
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This fixes build issues when building for RISC-V 32-bit with 5.1+ kernel
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headers.
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If an architecture only supports the suffixed syscalls, but is still
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using a 32-bit time_t fall back to the libc call.
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Upstream-Status: Backport [https://git.busybox.net/busybox/commit/?id=b7b7452f292f03eefafa6fd1da9bcfc933dee15a]
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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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---
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coreutils/date.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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--- a/coreutils/date.c
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+++ b/coreutils/date.c
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@@ -36,7 +36,7 @@
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//config:# defaults to "no": stat's nanosecond field is a bit non-portable
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//config:config FEATURE_DATE_NANO
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//config: bool "Support %[num]N nanosecond format specifier"
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-//config: default n # syscall(__NR_clock_gettime)
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+//config: default n # syscall(__NR_clock_gettime) or syscall(__NR_clock_gettime64)
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//config: depends on DATE
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//config: select PLATFORM_LINUX
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//config: help
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@@ -271,10 +271,17 @@ int date_main(int argc UNUSED_PARAM, cha
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*/
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#endif
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} else {
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-#if ENABLE_FEATURE_DATE_NANO
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+#if ENABLE_FEATURE_DATE_NANO && defined(__NR_clock_gettime)
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/* libc has incredibly messy way of doing this,
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* typically requiring -lrt. We just skip all this mess */
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syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
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+#elif ENABLE_FEATURE_DATE_NANO && __TIMESIZE == 64
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+ /* Let's only support the 64 suffix syscalls for 64-bit time_t.
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+ * This simplifies the code for us as we don't need to convert
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+ * between 64-bit and 32-bit. We also don't have a way to
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+ * report overflow errors here.
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+ */
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+ syscall(__NR_clock_gettime64, CLOCK_REALTIME, &ts);
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#else
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time(&ts.tv_sec);
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#endif
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