[v3,5/5] linux-user: Flush out implementation of gettimeofday

Message ID 20200213032223.14643-6-richard.henderson@linaro.org
State New
Headers show
Series
  • linux-user: Implement x86_64 vsyscalls
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Commit Message

Richard Henderson Feb. 13, 2020, 3:22 a.m.
The first argument, timeval, is allowed to be NULL.

The second argument, timezone, was missing.  While its use is
deprecated, it is still present in the syscall.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 linux-user/syscall.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

-- 
2.20.1

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b684727b83..a006e53088 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1224,6 +1224,23 @@  static inline abi_long host_to_target_timespec64(abi_ulong target_addr,
     return 0;
 }
 
+static inline abi_long copy_to_user_timezone(abi_ulong target_tz_addr,
+                                             struct timezone *tz)
+{
+    struct target_timezone *target_tz;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_tz, target_tz_addr, 1)) {
+        return -TARGET_EFAULT;
+    }
+
+    __put_user(tz->tz_minuteswest, &target_tz->tz_minuteswest);
+    __put_user(tz->tz_dsttime, &target_tz->tz_dsttime);
+
+    unlock_user_struct(target_tz, target_tz_addr, 1);
+
+    return 0;
+}
+
 static inline abi_long copy_from_user_timezone(struct timezone *tz,
                                                abi_ulong target_tz_addr)
 {
@@ -8575,10 +8592,16 @@  static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_gettimeofday:
         {
             struct timeval tv;
-            ret = get_errno(gettimeofday(&tv, NULL));
+            struct timezone tz;
+
+            ret = get_errno(gettimeofday(&tv, &tz));
             if (!is_error(ret)) {
-                if (copy_to_user_timeval(arg1, &tv))
+                if (arg1 && copy_to_user_timeval(arg1, &tv)) {
                     return -TARGET_EFAULT;
+                }
+                if (arg2 && copy_to_user_timezone(arg2, &tz)) {
+                    return -TARGET_EFAULT;
+                }
             }
         }
         return ret;