tcp/tcp_listen.c

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00001 // Copyright 2006 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the
00015 // Free Software Foundation, Inc.,
00016 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017 
00018 #include <unistd.h>
00019 #include <errno.h>
00020 #include <netinet/in.h>
00021 #include <sys/socket.h>
00022 
00023 #include "addr.h"
00024 #include "str.h"
00025 #include "tcp.h"
00026 
00027 int tcp_listen(const char *ip, int port, int backlog)
00028 {
00029         int fd;
00030         struct sockaddr_in inaddr;
00031         
00032         if (port < 1)
00033                 return errno = EINVAL, -1;
00034         
00035         str_zero(&inaddr, sizeof(inaddr));
00036         inaddr.sin_family = AF_INET;
00037         inaddr.sin_port   = htons(port);
00038         
00039         if (addr_from_str(ip, &inaddr.sin_addr.s_addr, 0) == 0)
00040                 return errno = EINVAL, -1;
00041         
00042         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
00043                 return -1;
00044         
00045         if (bind(fd, (struct sockaddr *) &inaddr, sizeof(struct sockaddr_in)) == -1) {
00046                 close(fd);
00047                 return -1;
00048         }
00049         
00050         if (listen(fd, backlog) == -1) {
00051                 close(fd);
00052                 return -1;
00053         }
00054         
00055         return fd;
00056 }

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