This file is indexed.

/usr/include/x86_64-linux-musl/bits/socket.h is in musl-dev 0.9.15-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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struct msghdr
{
	void *msg_name;
	socklen_t msg_namelen;
	struct iovec *msg_iov;
	int msg_iovlen, __pad1;
	void *msg_control;
	socklen_t msg_controllen, __pad2;
	int msg_flags;
};

struct cmsghdr
{
	socklen_t cmsg_len;
	int __pad1;
	int cmsg_level;
	int cmsg_type;
};