This file is indexed.

/usr/include/x86_64-linux-musl/bits/msg.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 msqid_ds
{
	struct ipc_perm msg_perm;
	time_t msg_stime;
	time_t msg_rtime;
	time_t msg_ctime;
	unsigned long msg_cbytes;
	msgqnum_t msg_qnum;
	msglen_t msg_qbytes;
	pid_t msg_lspid;
	pid_t msg_lrpid;
	unsigned long __unused[2];
};