Functions defined in /usr/include/arpa/inet.h

int              ascii2addr(int, const char *, void *);
char            *addr2ascii(int, const void *, int, char *);
in_addr_t        inet_addr(const char *);
int              inet_aton(const char *, struct in_addr *);
in_addr_t        inet_lnaof(struct in_addr);
struct in_addr   inet_makeaddr(in_addr_t, in_addr_t);
in_addr_t        inet_netof(struct in_addr);
in_addr_t        inet_network(const char *);
char            *inet_ntoa(struct in_addr);
int              inet_pton(int, const char *, void *);
const char      *inet_ntop(int, const void *, char *, size_t);
char            *inet_net_ntop(int, const void *, int, char *, size_t);
int              inet_net_pton(int, const char *, void *, size_t);
char            *inet_neta(in_addr_t, char *, size_t);
u_int    inet_nsap_addr(const char *, u_char *, int maxlen);
char    *inet_nsap_ntoa(int, const u_char *, char *ascii);

Types defined in /usr/include/sys/types.h

typedef unsigned char   u_char;
typedef unsigned short  u_short;
typedef unsigned int    u_int;
typedef unsigned long   u_long;
typedef unsigned short  ushort;         /* Sys V compatibility */
typedef unsigned int    uint;           /* Sys V compatibility */
#endif

typedef u_int64_t       u_quad_t;       /* quads */
typedef int64_t         quad_t;
typedef quad_t *        qaddr_t;

typedef char *          caddr_t;        /* core address */
typedef int32_t         daddr_t;        /* disk address */
typedef int32_t         dev_t;          /* device number */
typedef u_int32_t       fixpt_t;        /* fixed point number */
typedef u_int32_t       gid_t;          /* group id */
typedef u_int32_t       in_addr_t;      /* base type for internet address */
typedef u_int16_t       in_port_t;
typedef u_int32_t       ino_t;          /* inode number */
typedef long            key_t;          /* IPC key (for Sys V IPC) */
typedef u_int16_t       mode_t;         /* permissions */
typedef u_int16_t       nlink_t;        /* link count */
typedef quad_t          off_t;          /* file offset */
typedef int32_t         pid_t;          /* process id */
typedef quad_t          rlim_t;         /* resource limit */
typedef int32_t         segsz_t;        /* segment size */
typedef int32_t         swblk_t;        /* swap offset */
typedef u_int32_t       uid_t;          /* user id */
typedef u_int32_t       useconds_t;     /* microseconds (unsigned) */