bsd-user: implement chmod, fchmod, lchmod and fchmodat

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

bsd-user/bsd-file.h

@@ -675,4 +675,50 @@ static abi_long do_bsd_readlinkat(abi_long arg1, abi_long arg2,
     return ret;
 }
 
+/* chmod(2) */
+static abi_long do_bsd_chmod(abi_long arg1, abi_long arg2)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg1);
+    ret = get_errno(chmod(p, arg2)); /* XXX path(p)? */
+    UNLOCK_PATH(p, arg1);
+
+    return ret;
+}
+
+/* fchmod(2) */
+static abi_long do_bsd_fchmod(abi_long arg1, abi_long arg2)
+{
+    return get_errno(fchmod(arg1, arg2));
+}
+
+/* lchmod(2) */
+static abi_long do_bsd_lchmod(abi_long arg1, abi_long arg2)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg1);
+    ret = get_errno(lchmod(p, arg2)); /* XXX path(p)? */
+    UNLOCK_PATH(p, arg1);
+
+    return ret;
+}
+
+/* fchmodat(2) */
+static abi_long do_bsd_fchmodat(abi_long arg1, abi_long arg2,
+        abi_long arg3, abi_long arg4)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg2);
+    ret = get_errno(fchmodat(arg1, p, arg3, arg4));
+    UNLOCK_PATH(p, arg2);
+
+    return ret;
+}
+
 #endif /* BSD_FILE_H */

bsd-user/freebsd/os-syscall.c

@@ -402,6 +402,22 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4);
         break;
 
+    case TARGET_FREEBSD_NR_chmod: /* chmod(2) */
+        ret = do_bsd_chmod(arg1, arg2);
+        break;
+
+    case TARGET_FREEBSD_NR_fchmod: /* fchmod(2) */
+        ret = do_bsd_fchmod(arg1, arg2);
+        break;
+
+    case TARGET_FREEBSD_NR_lchmod: /* lchmod(2) */
+        ret = do_bsd_lchmod(arg1, arg2);
+        break;
+
+    case TARGET_FREEBSD_NR_fchmodat: /* fchmodat(2) */
+        ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4);
+        break;
+
     default:
         qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
         ret = -TARGET_ENOSYS;