sockets - sctp_bindx (Solaris sctp library) always return "Invalid argument" -


i writing sctp test program in solaris os, , use solaris native sctp stack. program likes this: 

if ((fd = socket(af_inet, sock_seqpacket, ipproto_sctp)) < 0) {     perror("socket"); }   addr.sin_family = af_inet; addr.sin_port = htons(9004); addr.sin_addr.s_addr = inet_addr("192.168.23.117"); if (sctp_bindx(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in), sctp_bindx_add_addr) < 0) {     perror("bind"); }

when running program, return error:"invalid argument". have used gdb check, , find addr structure right.
because solaris isn't open source, can check assembly code using gdb, , find sctp_bindx calls setsockopt function, , setsockopt function return error. calling setsockopt likes this: 

setsockopt(fd, sol_sctp, sctp_add_addr, addrs, addrs_size);

i have checked parameters, , find right. can't figure out cause of issue. me? in advance!

you need call bind first.

from oracle docs on sctp_bindx

an application can use sctp_bindx(sctp_bindx_add_addr) associate  additional addresses endpoint **after calling bind() function**.

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