86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* lib-myconnect.c:
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used by interfacedemo for "pyramid" LCD device.
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*/
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/*
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Copyright (C) 2005 Silvan Marco Fin <silvan@kernelconcepts.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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/* TCP connection to given host/port
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*/
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int get_connection(char *peername, int peerport)
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{
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struct sockaddr_in peeraddr;
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int SocketDescriptor;
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struct hostent *HostEntry;
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HostEntry=gethostbyname(peername);
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if (HostEntry==NULL)
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{
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switch (h_errno)
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{
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case HOST_NOT_FOUND:
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printf("Host not found.\n");
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return -1;
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break;
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case NO_ADDRESS:
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printf("No IP found for valid hostname.\n");
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return -1;
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break;
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case NO_RECOVERY:
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printf("Name service error.\n");
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return -1;
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break;
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case TRY_AGAIN:
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printf("Temporary error in name resolution.\n");
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return -1;
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break;
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default:
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break;
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}
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}
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/* peeraddr must contain information to reach the server */
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memset(&peeraddr, 0, sizeof(peeraddr));
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peeraddr.sin_family = AF_INET;
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peeraddr.sin_port = htons(peerport);
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peeraddr.sin_addr = *(struct in_addr *) HostEntry->h_addr;
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SocketDescriptor=socket(PF_INET, SOCK_STREAM, 0);
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if (SocketDescriptor==-1)
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{
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printf("Error creating socket\n");
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return -1;
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}
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if (connect(SocketDescriptor, (struct sockaddr *) &peeraddr, sizeof(peeraddr))==-1)
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{
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perror("Error connecting");
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return -1;
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}
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return SocketDescriptor;
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}
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