This is needed for new architectures like RISC-V which do not provide any
other rename-like syscall.

Signed-off-by: Andreas Schwab <schwab@suse.de>
---
 linux-user/syscall.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5e54889522..c258a0a44b 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -598,6 +598,24 @@ static int sys_utimensat(int dirfd, const char *pathname,
 #endif
 #endif /* TARGET_NR_utimensat */
 
+#ifdef TARGET_NR_renameat2
+#if defined(__NR_renameat2)
+#define __NR_sys_renameat2 __NR_renameat2
+_syscall5(int, sys_renameat2, int, oldfd, const char *, old, int, newfd,
+          const char *, new, unsigned int, flags)
+#else
+static int sys_renameat2(int oldfd, const char *old,
+                         int newfd, const char *new, int flags)
+{
+    if (flags == 0) {
+        return renameat(oldfd, old, newfd, new);
+    }
+    errno = ENOSYS;
+    return -1;
+}
+#endif
+#endif /* TARGET_NR_renameat2 */
+
 #ifdef CONFIG_INOTIFY
 #include <sys/inotify.h>
 
@@ -8342,6 +8360,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         }
         break;
 #endif
+#if defined(TARGET_NR_renameat2)
+    case TARGET_NR_renameat2:
+        {
+            void *p2;
+            p  = lock_user_string(arg2);
+            p2 = lock_user_string(arg4);
+            if (!p || !p2) {
+                ret = -TARGET_EFAULT;
+            } else {
+                ret = get_errno(sys_renameat2(arg1, p, arg3, p2, arg5));
+            }
+            unlock_user(p2, arg4, 0);
+            unlock_user(p, arg2, 0);
+        }
+        break;
+#endif
 #ifdef TARGET_NR_mkdir
     case TARGET_NR_mkdir:
         if (!(p = lock_user_string(arg1)))
-- 
2.16.1


-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Le 23/01/2018 à 11:53, Andreas Schwab a écrit :
> This is needed for new architectures like RISC-V which do not provide any
> other rename-like syscall.
> 
> Signed-off-by: Andreas Schwab <schwab@suse.de>
> ---
>  linux-user/syscall.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 5e54889522..c258a0a44b 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -598,6 +598,24 @@ static int sys_utimensat(int dirfd, const char *pathname,
>  #endif
>  #endif /* TARGET_NR_utimensat */
>  
> +#ifdef TARGET_NR_renameat2
> +#if defined(__NR_renameat2)
> +#define __NR_sys_renameat2 __NR_renameat2
> +_syscall5(int, sys_renameat2, int, oldfd, const char *, old, int, newfd,
> +          const char *, new, unsigned int, flags)
> +#else
> +static int sys_renameat2(int oldfd, const char *old,
> +                         int newfd, const char *new, int flags)
> +{
> +    if (flags == 0) {
> +        return renameat(oldfd, old, newfd, new);
> +    }
> +    errno = ENOSYS;
> +    return -1;
> +}
> +#endif
> +#endif /* TARGET_NR_renameat2 */
> +
>  #ifdef CONFIG_INOTIFY
>  #include <sys/inotify.h>
>  
> @@ -8342,6 +8360,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>          }
>          break;
>  #endif
> +#if defined(TARGET_NR_renameat2)
> +    case TARGET_NR_renameat2:
> +        {
> +            void *p2;
> +            p  = lock_user_string(arg2);
> +            p2 = lock_user_string(arg4);
> +            if (!p || !p2) {
> +                ret = -TARGET_EFAULT;
> +            } else {
> +                ret = get_errno(sys_renameat2(arg1, p, arg3, p2, arg5));
> +            }
> +            unlock_user(p2, arg4, 0);
> +            unlock_user(p, arg2, 0);
> +        }
> +        break;
> +#endif
>  #ifdef TARGET_NR_mkdir
>      case TARGET_NR_mkdir:
>          if (!(p = lock_user_string(arg1)))
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>