inet_ntop,inet_pton(替代inet_aton等)
http://beej.us/guide/bgnet/output/html/multipage/inet_ntopman.htmlinet_ntop
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
const char *inet_ntop(int af, const void *src,
char *dst, socklen_t cnt);
inet_pton (AF_INET或AF_INET6，支持IPV6，可重入！！！
const char *inet_ntop(int af, const void *src,-------这样可以支持多种结构体。
char *dst, socklen_t cnt);
成功，返回指向dst的非空指针；失败，返回Null
/* Structure describing an Internet (IP) socket address. */
#define __SOCK_SIZE__ 16/* sizeof(struct sockaddr)*/
struct sockaddr_in {
__kernel_sa_family_t sin_family;/* Address family*/
__be16 sin_port;/* Port number*/
struct in_addr sin_addr; /* Internet address*/ ------ 使用！
/* Pad to size of `struct sockaddr'. */
unsigned char __pad[__SOCK_SIZE__ - sizeof(short int) -
sizeof(unsigned short int) - sizeof(struct in_addr)];
};
The maximum lengths are: INET_ADDRSTRLEN and INET6_ADDRSTRLEN.
// IPv4 demo of inet_ntop() and inet_pton()
struct sockaddr_in sa;
char str[INET_ADDRSTRLEN];
// store this IP address in sa:
inet_pton(AF_INET, "192.0.2.33", &(sa.sin_addr));
// now get it back and print it
inet_ntop(AF_INET, &(sa.sin_addr), str, INET_ADDRSTRLEN);
printf("%s\n", str); // prints "192.0.2.33"
http://beej.us/guide/bgnet/output/html/multipage/inet_ntoaman.html
因为只支持IPv4，下面的API已淘汰：
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
struct in_addr {
unsigned long int s_addr;
}
int inet_aton(const char *cp, struct in_addr *inp);
in_addr_t inet_addr(const char *cp); --- 返回的整数形式是网络字节序；被 inet_aton淘汰，因为出错时返回-1；而cp为“255.255.255.255”时也返回-1。
in_addr_t inet_network(const char *cp); --- 返回的整数形式是主机字节序； 被 inet_aton淘汰，原因同上。
char *inet_ntoa(struct in_addr in); --- 返回静态空间，非线程安全
struct in_addr inet_makeaddr(int net, int host);
in_addr_t inet_lnaof(struct in_addr in);
in_addr_t inet_netof(struct in_addr in);
For example, inet_aton("226.000.000.037", &t) will interpret the address as 226.0.0.31 and not 226.0.0.37.
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