[Qemu-devel] [PATCH v7 02/10] 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    | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++
 linux-user/strace.list |  3 ++
 linux-user/syscall.c   | 17 +++++++++++
 3 files changed, 96 insertions(+)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index f37b386..a61717d 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -435,6 +435,69 @@ print_fdset(int n, abi_ulong target_fds_addr)
 }
 #endif
 
+#ifdef TARGET_NR_clock_adjtime
+/* IDs of the various system clocks */
+#define TARGET_CLOCK_REALTIME              0
+#define TARGET_CLOCK_MONOTONIC             1
+#define TARGET_CLOCK_PROCESS_CPUTIME_ID    2
+#define TARGET_CLOCK_THREAD_CPUTIME_ID     3
+#define TARGET_CLOCK_MONOTONIC_RAW         4
+#define TARGET_CLOCK_REALTIME_COARSE       5
+#define TARGET_CLOCK_MONOTONIC_COARSE      6
+#define TARGET_CLOCK_BOOTTIME              7
+#define TARGET_CLOCK_REALTIME_ALARM        8
+#define TARGET_CLOCK_BOOTTIME_ALARM        9
+#define TARGET_CLOCK_SGI_CYCLE             10
+#define TARGET_CLOCK_TAI                   11
+
+static void
+print_clockid(int clockid, int last)
+{
+    switch (clockid) {
+    case TARGET_CLOCK_REALTIME:
+        gemu_log("CLOCK_REALTIME");
+        break;
+    case TARGET_CLOCK_MONOTONIC:
+        gemu_log("CLOCK_MONOTONIC");
+        break;
+    case TARGET_CLOCK_PROCESS_CPUTIME_ID:
+        gemu_log("CLOCK_PROCESS_CPUTIME_ID");
+        break;
+    case TARGET_CLOCK_THREAD_CPUTIME_ID:
+        gemu_log("CLOCK_THREAD_CPUTIME_ID");
+        break;
+    case TARGET_CLOCK_MONOTONIC_RAW:
+        gemu_log("CLOCK_MONOTONIC_RAW");
+        break;
+    case TARGET_CLOCK_REALTIME_COARSE:
+        gemu_log("CLOCK_REALTIME_COARSE");
+        break;
+    case TARGET_CLOCK_MONOTONIC_COARSE:
+        gemu_log("CLOCK_MONOTONIC_COARSE");
+        break;
+    case TARGET_CLOCK_BOOTTIME:
+        gemu_log("CLOCK_BOOTTIME");
+        break;
+    case TARGET_CLOCK_REALTIME_ALARM:
+        gemu_log("CLOCK_REALTIME_ALARM");
+        break;
+    case TARGET_CLOCK_BOOTTIME_ALARM:
+        gemu_log("CLOCK_BOOTTIME_ALARM");
+        break;
+    case TARGET_CLOCK_SGI_CYCLE:
+        gemu_log("CLOCK_SGI_CYCLE");
+        break;
+    case TARGET_CLOCK_TAI:
+        gemu_log("CLOCK_TAI");
+        break;
+    default:
+        gemu_log("%d", clockid);
+        break;
+    }
+    gemu_log("%s", get_comma(last));
+}
+#endif
+
 /*
  * Sysycall specific output functions
  */
@@ -1096,6 +1159,19 @@ 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_clockid(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 44e8322..01aecfc 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -73,6 +73,9 @@
 #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 7ad5b96..9f11ca2 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9623,6 +9623,23 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
             }
         }
         break;
+#if defined(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)) {
+                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