Unix socket 程式設計API二之輔助函式

一：網路位元組序跟主機位元組序轉換：

#include uint32_t htonl(uint32_t hostlong); //host to network long

uint16_t htons(uint16_t hostshort);//host to network short
uint32_t ntohl(uint32_t netlong);  //network to host long
uint16_t ntohs(uint16_t netshort); //network to host short

#include	"unp.h"

int main(int argc, char **ar**)
un;un.s = 0x0102;
printf("%s: ", cpu_vendor_os);
if (sizeof(short) == 2)  else
printf("sizeof(short) = %d\n", sizeof(short));
exit(0);
}

#include #include #include int inet_aton(const char *cp, struct in_addr *inp); //將字串位址cp轉為struct in_addr結構

in_addr_t inet_addr(const char *cp);//將字串位址cp轉為in_addr_t結構
in_addr_t inet_network(const char *cp);//將字串位址cp轉為in_addr_t結構
char *inet_ntoa(struct in_addr in);//將struct in_addr位址結構轉換為字串

#include int inet_pton(int af, const char *src, void *dst);

const char *inet_ntop(int af, const void *src,char *dst, socklen_t size);

#include int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen);

int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen);

/* according to earlier standards */

#include #include #include int select(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout);
void   fd_clr(int fd, fd_set *set);
int  fd_isset(int fd, fd_set *set);
void   fd_set(int fd, fd_set *set);
void   fd_zero(fd_set *set);
#include int pselect(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, const struct timespec *timeout,
const sigset_t *sigmask);

#include /* see notes */

#include int getsockopt(int sockfd, int level, int optname,void *optval, socklen_t *optlen);
int setsockopt(int sockfd, int level, int optname,const void *optval, socklen_t optlen);

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