Aggiunto file che mi ero dimenticato e aggiunte sulle opzioni dei socket

[gapil.git] / listati / sockconn.c

diff --git a/listati/sockconn.c b/listati/sockconn.c
new file mode 100644 (file)
index 0000000..8419e97
--- /dev/null
+++ b/listati/sockconn.c
@@ -0,0 +1,43 @@
+int sockconn(char *host, char *serv, int prot, int type) 
+{
+    struct addrinfo hint, *addr, *save;
+    int res;
+    int sock;
+    memset(&hint, 0, sizeof(struct addrinfo)); 
+    hint.ai_family = PF_UNSPEC;            /* generic address (IPv4 or IPv6) */
+    hint.ai_protocol = prot;               /* protocol */
+    hint.ai_socktype = type;               /* socket type */
+    res = getaddrinfo(host, serv, &hint, &addr);    /* calling getaddrinfo */
+    if (res != 0) {                                 /* on error exit */
+       fprintf(stderr, "sockconn: resolution failed:");
+       fprintf(stderr, " %s\n", gai_strerror(res));
+       errno = 0;                         /* clear errno */
+       return -1;
+    }
+    save = addr;
+    while (addr != NULL) {                 /* loop on possible addresses */
+       sock = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
+       if (sock < 0) {                    /* on error */
+           if (addr->ai_next != NULL) {   /* if other addresses */
+               addr=addr->ai_next;        /* take next */
+               continue;                  /* restart cycle */
+           } else {                       /* else stop */
+               perror("sockconn: cannot create socket");
+               return sock;
+           }
+       }
+       if ( (res = connect(sock, addr->ai_addr, addr->ai_addrlen) < 0)) {
+           if (addr->ai_next != NULL) {   /* if other addresses */
+               addr=addr->ai_next;        /* take next */
+               close(sock);               /* close socket */
+               continue;                  /* restart cycle */
+           } else {                       /* else stop */
+               perror("sockconn: cannot connect");
+               close(sock);
+               return res;
+           }
+       } else break;                      /* ok, we are connected! */
+    }
+    freeaddrinfo(save);                    /* done, release memory */
+    return sock;
+}