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#include <arpa/inet.h>
int inet_aton(const char *strptr, struct in_addr *addrptr);
/* Returns: 1 if string was valid, 0 on error */
in_addr_t inet_addr(const char *strptr);
/* Returns: 32-bit binary network byte ordered IPv4 address; INADDR_NONE if error */
char *inet_ntoa(struct in_addr inaddr);
/* Returns: pointer to dotted-decimal string */
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