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To obtain a particular protocol, select the protocol number
as defined within the communication domain.
For the Internet domain,
the available protocols are defined in
netinet/in.h.
You can also use one of the library
routines such as getprotobyname in
getprotoent(SLIB):
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
/* ... */
pp = getprotobyname("tcp");
s = socket(AF_INET, SOCK_STREAM, pp->p_proto);