Connection failed socket in C -

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i'm trying create program connect itself. trigger thread client , thread server , create socket each thread. use same port.

when thread client tries connect thread server, connection fails. why? can't understanding. me!

the full code it's complicated, because it's big. i'll generalize.

#define addr "127.0.0.1"  struct threaddata{     int portnum;     int sockid;     int lastid;     unsigned int lastcheck; };  // ----------- ----- connection ------ ------------- //  void dieerror(char *message, int socket){     printf("%s\n", message);     if(socket != 0)         close(socket);     exit(1); }  int createsocket(int portnum, struct sockaddr_in* netw){     int sockid;      sockid = socket(af_inet, sock_stream, 0);     if(sockid == -1)         dieerror("socket() failed", sockid);      struct in_addr addrr;     if(inet_pton(af_inet, addr, &addrr) < 1)         dieerror("pton() failed", sockid);      netw->sin_family = af_inet;     netw->sin_port = htons(portnum);     netw->sin_addr = addrr;      return sockid; }  void listensocket(struct threaddata* thd, struct sockaddr_in* netw){      if(bind(thd->sockid, (struct sockaddr *) netw, sizeof(struct sockaddr)) == -1)         dieerror("bind() failed", thd->sockid);      if(listen(thd->sockid, 0) == -1)         dieerror("listen() failed", thd->sockid); }  int acceptconnection(int sockid, struct sockaddr* addrr){     socklen_t clen = sizeof(struct sockaddr);     int csocket = accept(sockid, addrr, &clen);      if(csocket == -1)         dieerror("accept() failed", sockid);      return csocket; }  int createconnection(int portnum, struct sockaddr_in* netw){     int sockid = createsocket(portnum, netw);      fcntl(sockid, f_setfl, o_nonblock);      if(connect(sockid, (struct sockaddr *) netw, sizeof(struct sockaddr)) == -1)         dieerror("connect() failed", sockid);      return sockid; }  // ----------- ----- ---------- ------ ------------- //  //receptor thread void * verifyport(void * param){     struct threaddata* thd = param;     int csocket;     struct sockaddr addrr;     struct sockaddr_in* netw = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));      thd->sockid = createsocket(thd->portnum, netw);     listensocket(thd, netw);     csocket = acceptconnection(thd->sockid, &addrr); }  //sender thread void verifykeyboard(int portnum){     int sockid;     struct sockaddr_in* netw = (struct sockaddr_in*) malloc(sizeof(struct sockaddr_in));     sockid = createconnection(portnum, netw); }  // ----------- ---- -------- ------- ------------- //  int main(int argc, char **argv){     pthread_t tid;     struct threaddata* thd;     thd = (struct threaddata*) malloc(sizeof(struct threaddata));      thd->portnum = atoi(argv[1]);     thd->lastid = -1;     thd->lastcheck = 0;      pthread_create(&tid, null, verifyport, thd);      verifykeyboard(atoi(argv[1]));      free(thd);      return 0; }

looks me passing wrong size of address structure connect() in client thread. this:

if (connect(sockid, addrr, sizeof(struct sockaddr)) == -1)

should be:

if (connect(sockid, addrr, sizeof(struct sockaddr_in)) == -1)

to indicate passing internet address connect(). sizeof(struct sockaddr) wrong, since that's generic structure type.

it's hard pinpoint other problems without more code.


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