[英]Protocol specific Socket creation and socket option information
I am trying to create a socket of sctp and then retrieve the socket options information, using sctp_opt_info(). 我正在尝试创建一个sctp套接字,然后使用sctp_opt_info()检索套接字选项信息。
I am successfully able to create the specific socket however on socket option retrieval I am getting the value as -1 indication some error. 我能够成功创建特定的套接字,但是在套接字选项检索中,我得到的值是-1,指示某些错误。 The error is because of invalid arguments of sctp_opt_info(). 该错误是由于sctp_opt_info()的参数无效。
Can some one please guide me what is wrong. 可以请一个人指导我怎么了。 Why am I getting -1 for this call and not 0(success indicator) 为什么我为此呼叫得到-1而不是0(成功指示符)
int socket_desc;
struct sockaddr_in sin[1];
unsigned int len;
int val1,val2;
char s[100];
struct sctp_rtoinfo {
sctp_assoc_t srto_assoc_id;
uint32_t srto_initial;
uint32_t srto_max;
uint32_t srto_min;
}rto;
socket_desc=socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
if (socket_desc==-1)
printf("Socket Fail");
val1 = sctp_opt_info(socket_desc,IPPROTO_SCTP,SCTP_RTOINFO,&rto,&len);
printf("Erro : %d, \n", errno );
perror(s);
printf("Status opt info: %d\n",val1);
I am getting the val1 value as -1 indicating some problem. 我将val1值设为-1表示存在问题。 The perror says invalid argument for sctp_opt_info(). 错误表明sctp_opt_info()的参数无效。 My guess is argument two of this function , not sure though. 我的猜测是此函数的参数二,虽然不确定。
Any help will be appreciated. 任何帮助将不胜感激。
Thanks 谢谢
len
, the last parameter to sctp_opt_info()
is a value-result parameter. len
, sctp_opt_info()
的最后一个参数是一个值结果参数。 You have to atleast initialize it to the length of the parameter you pass in, 您必须至少将其初始化为您传入的参数的长度,
len = sizeof rto;
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