This file is indexed.

/usr/include/x86_64-linux-musl/bits/sem.h is in musl-dev 1.1.19-1.

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 semid_ds {
	struct ipc_perm sem_perm;
	time_t sem_otime;
	time_t __unused1;
	time_t sem_ctime;
	time_t __unused2;
#if __BYTE_ORDER == __LITTLE_ENDIAN
	unsigned short sem_nsems;
	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
#else
	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
	unsigned short sem_nsems;
#endif
	time_t __unused3;
	time_t __unused4;
};