[PATCH] linux-user: strace now handles unshare syscall args correctly

[Matus Kysel]

Syscall unshare did not have custom print function for strace, but it's 
argument is same as flags in clone syscall, so it can be easily implemented.

Signed-off-by: Matus Kysel <mkysel@tachyum.com>
---
 linux-user/strace.c    | 12 ++++++++++++
 linux-user/strace.list |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index e969121b6c..d48df8c1a9 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -3467,6 +3467,18 @@ print_unlinkat(void *cpu_env, const struct syscallname 
*name,
 }
 #endif

+#ifdef TARGET_NR_unshare
+static void
+print_unshare(void *cpu_env, 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_flags(clone_flags, arg0, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
 #ifdef TARGET_NR_utime
 static void
 print_utime(void *cpu_env, const struct syscallname *name,
diff --git a/linux-user/strace.list b/linux-user/strace.list
index 084048ab96..3b7c15578c 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -1573,7 +1573,7 @@
 { TARGET_NR_unlinkat, "unlinkat" , NULL, print_unlinkat, NULL },
 #endif
 #ifdef TARGET_NR_unshare
-{ TARGET_NR_unshare, "unshare" , NULL, NULL, NULL },
+{ TARGET_NR_unshare, "unshare" , NULL, print_unshare, NULL },
 #endif
 #ifdef TARGET_NR_userfaultfd
 { TARGET_NR_userfaultfd, "userfaultfd" , NULL, NULL, NULL },
--
2.25.1