Using the Domaing Name System
with Examples in C |
Prof. David Bernstein
|
Computer Science Department |
bernstdh@jmu.edu |
int getaddrinfo(const char *host, const char *service, const struct addrinfo *hints, struct addrinfo **first)
host
|
The host name |
service
|
The service name (or port number) |
hints
|
Further criteria to use |
first
|
The first IP address (in a linked structure) |
Return | 0 on success; non-zero on error |
Note: ai_canonname
will be NULL
for all elements
in the linked structure after the first.
int getnameinfo(const struct sockaddr *address, socklen_t addrlen, char *host, socklen_t hostlen, char* service, socklen servlen, int flags)
address
|
The IP address of interest |
addrlen
|
The length of the IP address |
host
|
The corresponding host nam |
hostlen
|
The maximum length of a host name |
service
|
The corresponding service |
servlen
|
The maximum length of a service name |
flags
|
A bit mask of flags |
Return | 0 on success; non-zero on error |