Explain Network Address Conversion Routines

Explain Network Address Conversion Routines


  • 15 Jan, 2012

    Network Address Conversion Routines#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h> /* in_addr structure */unsigned long inet_addr(char *ptr)char *inet_ntoa(struct in_addr inaddr)inet_addr() converts a character string in dotted-decimal notation to a 32-bit Internet address. The return value is not consistent, unfortunately. The correct return should be a pointer to a structure of type in_addr but many systems, following an older convention, return only the internal representation of the dotted-decimal notation. The man pages will clarify the situation for the host system on which the function is used.inet_ntoa() expects a structure of type in_addr as a parameter (note that the structure itself is passed, not a pointer) and returns a pointer to a character string containing the dotted-decimal representation of the Internet address.

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