/* fd.c -- Definition of functions and structures for
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/* fd.c -- Definition of functions and structures for
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peripheral to communicate with host through file descriptors
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peripheral to communicate with host through file descriptors
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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This file is part of OpenRISC 1000 Architectural Simulator.
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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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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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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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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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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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if HAVE_CONFIG_H
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#if HAVE_CONFIG_H
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#include <config.h>
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#include <config.h>
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#endif
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#endif
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#include <sys/time.h> /* struct timeval */
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#include <sys/time.h> /* struct timeval */
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#include <sys/types.h> /* fd_set */
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#include <sys/types.h> /* fd_set */
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#include <stdio.h> /* perror */
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#include <stdio.h> /* perror */
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#include <stdlib.h> /* atoi */
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#include <stdlib.h> /* atoi */
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#include <unistd.h> /* read, write, select */
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#include <unistd.h> /* read, write, select */
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#if HAVE_MALLOC_H
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#if HAVE_MALLOC_H
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#include <malloc.h> /* calloc, free */
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#include <malloc.h> /* calloc, free */
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#endif
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#endif
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#include <string.h> /* strchr */
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#include <string.h> /* strchr */
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#include <errno.h> /* errno */
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#include <errno.h> /* errno */
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#include "channel.h"
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#include "channel.h"
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#include "generic.h"
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#include "generic.h"
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#include "fd.h"
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#include "fd.h"
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static void * fd_init(const char * args)
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static void * fd_init(const char * args)
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{
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{
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struct fd_channel * retval;
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struct fd_channel * retval;
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retval = (struct fd_channel*)calloc(1, sizeof(struct fd_channel));
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retval = (struct fd_channel*)calloc(1, sizeof(struct fd_channel));
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if(!retval)
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if(!retval)
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{
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{
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return NULL;
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return NULL;
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}
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}
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retval->fdin = atoi(args); /* so 0 if garbage */
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retval->fdin = atoi(args); /* so 0 if garbage */
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/* TODO: strtoul */
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/* TODO: strtoul */
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args = strchr(args, ',');
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args = strchr(args, ',');
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if(args)
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if(args)
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{
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{
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retval->fdout = atoi(args+1);
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retval->fdout = atoi(args+1);
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}
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}
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else
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else
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{
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{
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retval->fdout = retval->fdin;
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retval->fdout = retval->fdin;
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}
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}
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return (void*)retval;
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return (void*)retval;
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}
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}
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int fd_read(void * data, char * buffer, int size)
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int fd_read(void * data, char * buffer, int size)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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struct timeval timeout = { 0, 0 };
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struct timeval timeout = { 0, 0 };
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fd_set rfds;
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fd_set rfds;
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int retval;
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int retval;
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if(!fds)
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if(!fds)
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{
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{
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errno = ENODEV;
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errno = ENODEV;
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return -1;
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return -1;
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}
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}
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FD_ZERO(&rfds);
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FD_ZERO(&rfds);
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FD_SET(fds->fdin, &rfds);
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FD_SET(fds->fdin, &rfds);
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retval = select(fds->fdin+1, &rfds, NULL, NULL, &timeout);
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retval = select(fds->fdin+1, &rfds, NULL, NULL, &timeout);
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if(retval <= 0)
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if(retval <= 0)
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return retval;
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return retval;
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return read(fds->fdin, buffer, size);
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return read(fds->fdin, buffer, size);
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}
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}
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int fd_write(void * data, const char * buffer, int size)
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int fd_write(void * data, const char * buffer, int size)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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return write(fds->fdout, buffer, size);
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return write(fds->fdout, buffer, size);
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}
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}
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errno = ENODEV;
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errno = ENODEV;
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return -1;
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return -1;
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}
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}
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static int fd_isok(void * data)
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static int fd_isok(void * data)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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return fds->fdout != -1 && fds->fdin != -1;
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return fds->fdout != -1 && fds->fdin != -1;
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}
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}
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return 0;
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return 0;
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}
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}
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static int fd_status_fd(int fd, char * str, int size)
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static int fd_status_fd(int fd, char * str, int size)
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{
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{
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if(fd == -1)
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if(fd == -1)
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return snprintf(str, size, "closed");
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return snprintf(str, size, "closed");
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return snprintf(str, size, "opened(fd=%d)", fd);
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return snprintf(str, size, "opened(fd=%d)", fd);
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}
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}
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char * fd_status(void * data)
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char * fd_status(void * data)
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{
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{
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static char retval[256];
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static char retval[256];
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int index = 0;
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int index = 0;
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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index += snprintf(retval + index, sizeof(retval) - index, "in ");
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index += snprintf(retval + index, sizeof(retval) - index, "in ");
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index += fd_status_fd(fds->fdin, retval + index, sizeof(retval) - index);
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index += fd_status_fd(fds->fdin, retval + index, sizeof(retval) - index);
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index += snprintf(retval + index, sizeof(retval) - index, "out ");
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index += snprintf(retval + index, sizeof(retval) - index, "out ");
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index += fd_status_fd(fds->fdout, retval + index, sizeof(retval) - index);
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index += fd_status_fd(fds->fdout, retval + index, sizeof(retval) - index);
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}
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}
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else
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else
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{
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{
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snprintf(retval, sizeof(retval), "(null)");
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snprintf(retval, sizeof(retval), "(null)");
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}
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}
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return retval;
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return retval;
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}
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}
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struct channel_ops fd_channel_ops =
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struct channel_ops fd_channel_ops =
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{
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{
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init: fd_init,
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init: fd_init,
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open: generic_open,
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open: generic_open,
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close: generic_close,
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close: generic_close,
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read: fd_read,
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read: fd_read,
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write: fd_write,
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write: fd_write,
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free: generic_free,
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free: generic_free,
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isok: fd_isok,
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isok: fd_isok,
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status: fd_status,
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status: fd_status,
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};
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};
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/*
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/*
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* Local variables:
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* Local variables:
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* c-file-style: "linux"
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* c-file-style: "linux"
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* End:
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* End:
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*/
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*/
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