aboutsummaryrefslogtreecommitdiff
path: root/linux-user
diff options
context:
space:
mode:
authorTom Musta <tommusta@gmail.com>2014-08-12 13:53:36 -0500
committerRiku Voipio <riku.voipio@linaro.org>2014-08-22 15:06:34 +0300
commitb6ce1f6b90903961f66b0aec7be75d6c94560e40 (patch)
tree96221ce865de6fd007f77cee98b32af000365331 /linux-user
parent37ed09560c51465c3b8a659b9d18d43e75726c04 (diff)
downloadqemu-b6ce1f6b90903961f66b0aec7be75d6c94560e40.zip
qemu-b6ce1f6b90903961f66b0aec7be75d6c94560e40.tar.gz
qemu-b6ce1f6b90903961f66b0aec7be75d6c94560e40.tar.bz2
linux-user: Conditionally Pass Attribute Pointer to mq_open()
The mq_open system call takes an optional struct mq_attr pointer argument in the fourth position. This pointer is used when O_CREAT is specified in the flags (second) argument. It may be NULL, in which case the queue is created with implementation defined attributes. Change the code to properly handle the case when NULL is passed in the arg4 position. Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fa8ba8f..e754dbb 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9115,12 +9115,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
case TARGET_NR_mq_open:
{
- struct mq_attr posix_mq_attr;
+ struct mq_attr posix_mq_attr, *attrp;
p = lock_user_string(arg1 - 1);
- if (arg4 != 0)
+ if (arg4 != 0) {
copy_from_user_mq_attr (&posix_mq_attr, arg4);
- ret = get_errno(mq_open(p, arg2, arg3, &posix_mq_attr));
+ attrp = &posix_mq_attr;
+ } else {
+ attrp = 0;
+ }
+ ret = get_errno(mq_open(p, arg2, arg3, attrp));
unlock_user (p, arg1, 0);
}
break;