I'm completely stumped on this. An AIX machine I'm working on is attempting to send email, but the SMTP connection is failing. I have no idea what this code does or if it should even work. If someone could give me a hand, or a suggestion on what else to use, I would appreciate it.
I cannot debug this - when I step into connect() it appears to step-over.
Code:
#if INCL_WINSOCK_API_PROTOTYPES
WINSOCK_API_LINKAGE
int
WSAAPI
connect(
IN SOCKET s,
__in_bcount(namelen) const struct sockaddr FAR * name,
IN int namelen
);
#endif /* INCL_WINSOCK_API_PROTOTYPES */
I would try printing the value of "errno" to find out why the socket didnt connect.
I would also have a look at "the_socket" to make sure it is >= 0.
Then I would also look at the contents of sa_in (which should be a struct sockaddr_in)
My guess from the WINSOCK comment is that this is a ported windows application. As such I believe they can be different in the way that the sa_in is formed (intel is little endian and power is big endian, so for example a missing "htons" on the port or something like that could make a difference on only one platform)
None of that winsock stuff matters unless INCL_WINSOCK_API_PROTOTYPES is defined -- it's probably safe to ignore. Windows does in fact have a socket API that vaguely resembles the expected standard, so the code could have been ported as citaylor noted...
After it fails you can try perror("connection failed"); and it should print something like connection failed: no route to host or whatever to stderr.
connect() is usually a system call, not a function, meaning there's nothing happening inside your process to trace during connect() -- it's asleep. Some special instruction or software interrupt has transferred control to the kernel, which will wake it back up when its done.
For more detail on the connect call, try man 2 connect
---------- Post updated at 02:22 PM ---------- Previous update was at 02:06 PM ----------
const char *host="smtp.whatever.com";
short int port=25; // standard smtp port
int sockfd, n;
struct sockaddr_in serv_addr;
struct hostent *server;
sockfd=socket(AF_INET, SOCK_STREAM, 0);
server=gethostbyname(host); // look up host's IP address
// copy the IP address and port into the address structure
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family=AF_INET;
bcopy(server->h_addr,&serv_addr.sin_addr.s_addr, server->h_length);
serv_addr.sin_port=htons(port); // htons() puts it in the right byte order
connect(sockfd, &serv_addr, sizeof(serv_addr));
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global inte-
ger variable errno is set to indicate the error.
Yes, and the perror() command I suggested above checks errno to tell what it should print. errno is a global variable that's set by system calls, so when most any system call returns an error, perror can tell you what it is.
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01-20-2011
