[Qemu-devel] [PATCH v5 2/8] linux-user: Add support for clock_adjtime() syscall

[Aleksandar Markovic]

From: Aleksandar Markovic <address@hidden>

This patch implements Qemu user mode clock_adjtime() syscall support.

The implementation is based on invocation of host's clock_adjtime(), and is
very similar to the implementation of adjtimex() syscall support. The main
difference is the presence of "clockid_t" argument in clock_adjtime().

Signed-off-by: Aleksandar Rikalo <address@hidden>
Signed-off-by: Aleksandar Markovic <address@hidden>
---
 linux-user/strace.c    | 13 +++++++++++++
 linux-user/strace.list |  3 +++
 linux-user/syscall.c   | 19 ++++++++++++++++++-
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 7ddcaf8..4524c70 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -968,6 +968,19 @@ print_chmod(const struct syscallname *name,
 }
 #endif
 
+#ifdef TARGET_NR_clock_adjtime
+static void
+print_clock_adjtime(const struct syscallname *name,
+    abi_long arg0, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_pointer(arg1, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
 #ifdef TARGET_NR_clone
 static void do_print_clone(unsigned int flags, abi_ulong newsp,
                            abi_ulong parent_tidptr, target_ulong newtls,
diff --git a/linux-user/strace.list b/linux-user/strace.list
index 9a665a8..00b2e9b 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -72,6 +72,9 @@
 #ifdef TARGET_NR_chroot
 { TARGET_NR_chroot, "chroot" , NULL, NULL, NULL },
 #endif
+#ifdef TARGET_NR_clock_adjtime
+{ TARGET_NR_clock_adjtime, "clock_adjtime" , NULL, print_clock_adjtime, NULL },
+#endif
 #ifdef TARGET_NR_clock_getres
 { TARGET_NR_clock_getres, "clock_getres" , NULL, NULL, NULL },
 #endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5643840..eab9207 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6579,7 +6579,7 @@ static inline abi_long target_ftruncate64(void *cpu_env, 
abi_long arg1,
 }
 #endif
 
-#ifdef TARGET_NR_adjtimex
+#if defined(TARGET_NR_adjtimex) || defined(TARGET_NR_clock_adjtime)
 static inline abi_long target_to_host_timex(struct timex *host_buf,
                                             abi_long target_addr)
 {
@@ -9509,6 +9509,23 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
         }
         break;
 #endif
+#ifdef TARGET_NR_clock_adjtime
+    case TARGET_NR_clock_adjtime:
+        {
+            struct timex host_buf;
+
+            if (target_to_host_timex(&host_buf, arg2) != 0) {
+                goto efault;
+            }
+            ret = get_errno(clock_adjtime(arg1, &host_buf));
+            if (!is_error(ret) && arg1) {
+                if (host_to_target_timex(arg2, &host_buf) != 0) {
+                    goto efault;
+                }
+            }
+        }
+        break;
+#endif
 #ifdef TARGET_NR_create_module
     case TARGET_NR_create_module:
 #endif
-- 
2.9.3