c - socket not bind() ing - Invalid argument -
good evening all, kicks , giggles i'm trying hand @ *nix sockets , tcp/ip. now, off ground i'm trying create socket on 2 endpoints , basic text chat program , forth. now, before i'm , running i'm hit bind 'invalid argument':
user@user-virtualbox:~/sockets$ ./socket sock=3 s_->sin_family = 2 s_->sin_port = 3879 s_->sin_addr.s_addr = 0 sockfd = 3 s_->sin_family = 2 s_->sin_port = 3879 s_->sin_addr.s_addr = 0 socket bind error: invalid argument sizeof(s_) = 8 code below. so, inaddr_any should 255.255.225.255 = 0, understand; af_inet 2; , sin_port, well, i've looked @ binary backward , forward , not sure understand how 9000 represented in host order @ 3879 9000, assume it's non-issue. additionally, since 1 stdout , 2 stderr, assume above dynamically allocated , 3 should fine socket file descriptor.
#include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <netinet/in.h> #include <string.h> #include <errno.h> void setsocket(struct sockaddr_in* s_){ s_->sin_family=af_inet; s_->sin_port=htons(9999); s_->sin_addr.s_addr=inaddr_any; memset(&(s_->sin_zero), '\0', 8); printf("s_->sin_family = %i\n", s_->sin_family); printf("s_->sin_port = %i\n", s_->sin_port); printf("s_->sin_addr.s_addr= %i\n", s_->sin_addr.s_addr); } void createsocket(int *sock){ if ((*sock = socket(af_inet, sock_stream, 0)) == -1){ fprintf(stderr, "socket creation error: %s\n", strerror(errno)); exit(1); } printf("sock = %i\n", *sock); fflush(stdout); } void bindsocket(int sock, struct sockaddr_in* s_){ printf("s_->sin_family = %i\n",s_->sin_family); printf("s_->sin_port = %i\n",s_->sin_port); printf("s_->sin_addr.s_addr = %i\n",s_->sin_addr.s_addr); if((bind(sock, (struct sockaddr*)s_, (socklen_t)sizeof(s_))) == -1){ fprintf(stderr, "socket bind error: %s\n", strerror(errno)); } printf("sizeof(s_) = %lu\n", sizeof(s_)); } int main(int argc, char* argv[]){ int sockfd; struct sockaddr_in socket_; createsocket(&sockfd); setsocket(&socket_); printf("sockfd = %i\n", sockfd); fflush(stdout); bindsocket(sockfd, &socket_); exit(0); }
i believe problem
sizeof() inside bind()... 's_' pointer, sizeof (probably) 4... need dereference it:
if((bind(sock, (struct sockaddr*)s_, (socklen_t)sizeof(*s_))) == -1){ fprintf(stderr, "socket bind error: %s\n", strerror(errno)); }