* [Qemu-devel] [PATCH] linux-user: fix special case pwrite64 with count = 0
@ 2017-10-01 0:34 Carlo Marcelo Arenas Belón
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From: Carlo Marcelo Arenas Belón @ 2017-10-01 0:34 UTC (permalink / raw)
To: qemu-devel
Cc: zhuoweizhang, laurent, peter.maydell,
Carlo Marcelo Arenas Belón
building on the work from Zhuowei Zhang for making write return 0 instead
of -1 when called with: write(fd, NULL, 0)
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
linux-user/syscall.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 9b6364a266..89e883f187 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -10509,6 +10509,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
arg4 = arg5;
arg5 = arg6;
}
+ if (arg2 == 0 && arg3 == 0) {
+ ret = get_errno(pwrite64(arg1, NULL, arg3, target_offset64(arg4, arg5)));
+ break;
+ }
if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
goto efault;
ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));
--
2.14.2
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