UNIX網絡編程-函數原型

 

#include <netinet/in.h>
struct in_addr {
    in_addr_t s_addr;                     /* 32-bit IPv4 address */
};                                        /* network byte ordered */

struct sockaddr_in {
    unit8_t        sin_len;               /* length of structure (16) */
    sa_family_t    sin_family;            /* AF_INET */
    in_port_t      sin_port;              /* 16-bit TCP or UDP port number */
                                          /* network byte ordered */
    struct in_addr sin_addr;              /* 32-bit IPv4 address */
                                          /* network byte ordered */
    char           sin_zero[8];           /* unused */
};

/* ============================================================================================================================================ */
#include <arpa/inet.h>
int inet_aton(const char *strptr, struct in_addr *addrptr);
返回：若字符串有效則爲1，不然爲0

in_addr_t inet_addr(const char *strptr);
返回：若字符串有效則爲32位二進制網絡字節序的IPv4地址，不然爲INADDR_NONE

char *inet_ntoa(struct in_addr inaddr);
返回：指向一個點分十進制數串的指針

/* ============================================================================================================================================ */
#include <sys/socket.h>
ssize_t recv(int sockfd, void *buff, size_t nbytes, int flags);

ssize_t send(int sockfd, const void *buff, size_t nbytes, int flags);

返回：若成功則爲讀入或寫出的字節數，若出錯則爲-1



#include <sys/uio.h>
ssize_t readv(int filedes, const struct iovec *iov, int iovcnt);

ssize_t writev(int filedes, const struct iovec *iov, int iovcnt);

返回：若成功則爲讀入或寫出的字節數，若出錯則爲-1



#include <sys/socket.h>
ssize_t recvfrom(int sockfd, void *buff, size_t nbytes, int flags, struct sockaddr *from, socklen_t *addrlen);

ssize_t sendto(int sockfd, const void *buff, size_t nbytes, int flags, const struct sockaddr *to, socklen_t addrlen);

返回：若成功則爲讀或寫的字節數，若出錯則爲-1



#include <sys/socket.h>
ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags);

ssize_t sendmsg(int sockfd, struct msghdr *msg, int flags);

返回：若成功則爲讀入或寫出的字節數，若出錯則爲-1