More or less what it says in the title. I have a call to getaddrinfo like so:
struct addrinfo crossplat, *actual_addr;
crossplat.ai_family = AF_UNSPEC; //IPv4 or IPv6.
crossplat.ai_socktype = SOCK_STREAM;
if(int i = getaddrinfo("localhost", "8000", &crossplat, &actual_addr)!=0){
cerr << "error code " << i << " received. Meaning: "<< gai_strerror(i) << endl;
return -1;
}
Which proudly prints:
error code 1 received. Meaning: Unknown error
on my system.
The getaddrinfo man page on my system:
RETURN VALUE
getaddrinfo() returns 0 if it succeeds, or one of the following
nonzero error codes:
EAI_ADDRFAMILY....
...The gai_strerror() function translates these error codes to a
human readable string, suitable for error reporting.
Which suggests to me that all non-zero codes returned by getaddrinfo should be one of the listed EAI_* family codes. Searching online suggests that gai_strerror() will only return "Unknown error" when it is passed an error code which is not a member of the EAI_* family, which would seem to rule out "1" being such a code.
Apparently I'm doing something rather wrong here, so any assistance would be greatly appreciated!
This expression is a syntax error in C, but assuming you are using C++ it's not grouped how you're expecting:
if (int i = getaddrinfo("localhost", "8000", &crossplat, &actual_addr)!=0){
This will assign the result of getaddrinfo("localhost", "8000", &crossplat, &actual_addr) != 0 to i, which is always either 0 or 1. Any non-zero return by getaddrinfo() will leave i with the value of 1.
You need to declare i earlier so that you can paranthesize the assignment:
int i;
if ((i = getaddrinfo("localhost", "8000", &crossplat, &actual_addr)) != 0) {
(of course, having done this you'd probably also move the getaddrinfo() call to the initializer of i).