[Qemu-devel] [PATCH] linux-user: implement renameat2

[Andreas Schwab]

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

Signed-off-by: Andreas Schwab <address@hidden>
---
 linux-user/syscall.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5e54889522..12ca06c65a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -598,6 +598,23 @@ 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 chat *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 +8359,22 @@ 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,
+                                              target_to_host_bitmask(arg5, 
fcntl_flags_tbl)));
+            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)))
-- 
2.16.0

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