third_party/fuchsia-sdk/arch/arm64/sysroot/include/bits/shm.h

#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;
};

struct shminfo {
  unsigned long shmmax, shmmin, shmmni, shmseg, shmall, __unused[4];
};

struct shm_info {
  int __used_ids;
  unsigned long shm_tot, shm_rss, shm_swp;
  unsigned long __swap_attempts, __swap_successes;
};