TCP/IP Sockets in C, Second Edition: Practical Guide for by Michael J. Donahoo, Kenneth L. Calvert

By Michael J. Donahoo, Kenneth L. Calvert

This booklet comprises adequate effortless to learn factors of tangible operating code for you to inside of a number of hours have a client/server socket connection up and dealing. either the textual content and the code are good written and simple to persist with. complicated information regarding non-blocking I/O allowed me to fast enforce heritage socket reads with no tying up a foreground technique. the irritating occurrences of

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Additional resources for TCP/IP Sockets in C, Second Edition: Practical Guide for Programmers (The Morgan Kaufmann Practical Guides Series)

Example text

Our generic code depends on this fact. The authors contend that these definitions will not change, but feel that full disclosure of this assumption (which allows more concise code) is important. Elimination of this assumption is straightforward enough to be left as an exercise. 2 Generic TCP Server Our protocol-independent TCP echo server uses similar adaptations to those in the client. Recall that the typical server binds to any available local address. To accomplish this, we (1) specify the ai_passive flag and (2) specify null for the hostname.

However, we are only interested here in IPv4 (af_inet) and IPv6 (af_inet6). The src parameter references a null-terminated character string containing the address to convert. The dst parameter points to a block of memory in the caller’s space to hold the result; its length must be sufficient to hold the result (at least 4 bytes for IPv4 and 16 bytes for IPv6). inet_pton() returns 1 if the conversion succeeds, with the address referenced by dst in network byte order; 0 if the string pointed to by src is not formatted as a valid address; and −1 if the specified address family is unknown.

Check return value: lines 26–27 getaddrinfo() returns 0 if successful. Otherwise, the return value indicates the specific error. The auxiliary function gai_strerror() returns a character string error message explaining the given error return value. Note that these messages are different from the normal errno-based messages. 4. Print addresses: lines 29–33 Iterate over the linked list of addresses, printing each to the console. The function PrintSocketAddress() takes an address to print and the stream on which to print.

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