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

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#define SHMLBA 4096

struct shmid_ds
{
	struct ipc_perm shm_perm;
	size_t shm_segsz;
	time_t shm_atime;
	time_t shm_dtime;
	time_t shm_ctime;
	pid_t shm_cpid;
	pid_t shm_lpid;
	unsigned long shm_nattch;
	unsigned long __pad1;
	unsigned long __pad2;
};