From: Laurent Vivier <laurent@vivier.eu>
If the call is interrupted by a signal handler, it fails with error EINTR
and if "remain" is not NULL and "flags" is not TIMER_ABSTIME, it returns
the remaining unslept time in "remain".
Update linux-user to not overwrite the "remain" structure if there is no
error.
Found with "make check-tcg", linux-test fails on nanosleep test:
TEST linux-test on x86_64
.../tests/tcg/multiarch/linux-test.c:242: nanosleep
Reported-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200722174612.2917566-2-laurent@vivier.eu>
---
linux-user/syscall.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 1211e759c26..43a6e283961 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -11831,8 +11831,14 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
target_to_host_timespec(&ts, arg3);
ret = get_errno(safe_clock_nanosleep(arg1, arg2,
&ts, arg4 ? &ts : NULL));
- if (arg4)
+ /*
+ * if the call is interrupted by a signal handler, it fails
+ * with error -TARGET_EINTR and if arg4 is not NULL and arg2 is not
+ * TIMER_ABSTIME, it returns the remaining unslept time in arg4.
+ */
+ if (ret == -TARGET_EINTR && arg4 && arg2 != TIMER_ABSTIME) {
host_to_target_timespec(arg4, &ts);
+ }
#if defined(TARGET_PPC)
/* clock_nanosleep is odd in that it returns positive errno values.
--
2.20.1