118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2011 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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*
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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 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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/* This file implements a transparent channel over which the GDB Remote
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* Serial Debugging protocol is implemented. This implementation for Linux
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* uses a TCP server on port 2000.
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*/
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#include <stdio.h>
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#ifndef WIN32
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# include <sys/socket.h>
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# include <netinet/in.h>
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# include <sys/select.h>
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#else
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# include <winsock2.h>
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# include <windows.h>
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# include <ws2tcpip.h>
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#endif
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#include <assert.h>
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#include "general.h"
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#include "gdb_if.h"
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static int gdb_if_serv, gdb_if_conn;
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int gdb_if_init(void)
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{
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#ifdef WIN32
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WSADATA wsaData;
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WSAStartup(MAKEWORD(2, 2), &wsaData);
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#endif
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struct sockaddr_in addr;
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int opt;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(2000);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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assert((gdb_if_serv = socket(PF_INET, SOCK_STREAM, 0)) != -1);
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opt = 1;
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assert(setsockopt(gdb_if_serv, SOL_SOCKET, SO_REUSEADDR, (void*)&opt, sizeof(opt)) != -1);
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assert(bind(gdb_if_serv, (void*)&addr, sizeof(addr)) != -1);
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assert(listen(gdb_if_serv, 1) != -1);
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DEBUG("Listening on TCP:2000\n");
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return 0;
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}
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unsigned char gdb_if_getchar(void)
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{
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unsigned char ret;
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int i = 0;
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while(i <= 0) {
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if(gdb_if_conn <= 0) {
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gdb_if_conn = accept(gdb_if_serv, NULL, NULL);
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DEBUG("Got connection\n");
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}
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i = recv(gdb_if_conn, (void*)&ret, 1, 0);
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if(i <= 0) {
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gdb_if_conn = -1;
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DEBUG("Dropped broken connection\n");
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/* Return '+' in case we were waiting for an ACK */
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return '+';
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}
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}
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return ret;
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}
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unsigned char gdb_if_getchar_to(int timeout)
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{
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fd_set fds;
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struct timeval tv;
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if(gdb_if_conn == -1) return -1;
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = (timeout % 1000) * 1000;
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FD_ZERO(&fds);
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FD_SET(gdb_if_conn, &fds);
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if(select(gdb_if_conn+1, &fds, NULL, NULL, &tv) > 0)
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return gdb_if_getchar();
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return -1;
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}
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void gdb_if_putchar(unsigned char c, int flush)
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{
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(void)flush;
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if (gdb_if_conn > 0)
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send(gdb_if_conn, (void*)&c, 1, 0);
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}
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