Answer Posted / chaitanya
Use the getservbyname() routine. This will return a pointer to a servent structure. You are interested in the s_port field, which contains the port number, with correct byte ordering (so you don't need to call htons() on it). Here is a sample routine:
/* Take a service name, and a service type, and return a port number. If the service name is not found, it tries it as a decimal number. The number returned is byte ordered for the network. */
int atoport(char *service, char *proto)
{
int port;
long int lport;
struct servent *serv;
char *errpos;
/* First try to read it from /etc/services */
serv = getservbyname(service, proto);
if (serv != NULL)
port = serv->s_port;
else {
/* Not in services, maybe a number? */
lport = strtol(service,&errpos,0);
if ( (errpos[0] != 0) || (lport < 1)
|| (lport > 5000) )
return -1;
/* Invalid port address */
port = htons(lport);
}
return port;
}
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How many sockets can a cpu have?
How to find other end of unix socket connection?
What is af_inet in socket?
What pieces of information make up a socket?
What is socket address?
What is a sae socket?
What is a socket address?
What is socket address with example?
How do unix sockets work?
How does unix socket work?
What's the difference between impact sockets and regular sockets?
Is tcp or unix socket faster?
Why do we need sockets?
What is a socket api?
Is socket a hardware or software?
