Add {name, open}_to_handle_at() implementation

copied from musl 1.2.1.

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>

include/fcntl.h

@@ -281,6 +281,18 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset, __off64_t __le
 # endif
 #endif
 
+#if (defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU)
+struct file_handle {
+	unsigned handle_bytes;
+	int handle_type;
+	unsigned char f_handle[];
+};
+
+int name_to_handle_at(int dirfd, const char *pathname,
+	struct file_handle *handle, int *mount_id, int flags);
+int open_by_handle_at(int mount_fd, struct file_handle *handle, int flags);
+#endif
+
 __END_DECLS
 
 #endif /* fcntl.h  */

libc/sysdeps/linux/common/Makefile.in

@@ -32,6 +32,8 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
 	iopl.c \
 	modify_ldt.c \
 	module.c \
+	name_to_handle_at.c \
+	open_by_handle_at.c \
 	personality.c \
 	pipe2.c \
 	ppoll.c \

libc/sysdeps/linux/common/name_to_handle_at.c

@@ -0,0 +1,36 @@
+/*
+ * Copyright © 2005-2020 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Imported from musl C library
+ */
+
+#include <sys/syscall.h>
+
+#ifdef __NR_open_by_handle_at
+#include <fcntl.h>
+int name_to_handle_at(int dirfd, const char *pathname,
+	struct file_handle *handle, int *mount_id, int flags)
+{
+	return INLINE_SYSCALL(name_to_handle_at, 5, dirfd, pathname, handle,
+			      mount_id, flags);
+}
+#endif

libc/sysdeps/linux/common/open_by_handle_at.c

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2005-2020 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Imported from musl C library
+ */
+
+#include <sys/syscall.h>
+
+#ifdef __NR_open_by_handle_at
+#include <fcntl.h>
+int open_by_handle_at(int mount_fd, struct file_handle *handle, int flags)
+{
+	return INLINE_SYSCALL(open_by_handle_at, 3, mount_fd, handle, flags);
+}
+#endif