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[/] [or1k/] [tags/] [nog_patch_38/] [or1ksim/] [peripheral/] [channels/] [fd.c] - Rev 1070
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/* fd.c -- Definition of functions and structures for peripheral to communicate with host through file descriptors Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca> This file is part of OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <sys/time.h> /* struct timeval */ #include <sys/types.h> /* fd_set */ #include <stdio.h> /* perror */ #include <stdlib.h> /* atoi */ #include <unistd.h> /* read, write, select */ #include <malloc.h> /* calloc, free */ #include <string.h> /* strchr */ #include <errno.h> /* errno */ #include "channel.h" #include "generic.h" #include "fd.h" static void * fd_init(const char * args) { struct fd_channel * retval; retval = (struct fd_channel*)calloc(1, sizeof(struct fd_channel)); if(!retval) { return NULL; } retval->fdin = atoi(args); /* so 0 if garbage */ /* TODO: strtoul */ args = strchr(args, ','); if(args) { retval->fdout = atoi(args+1); } else { retval->fdout = retval->fdin; } return (void*)retval; } int fd_read(void * data, char * buffer, int size) { struct fd_channel * fds = (struct fd_channel *)data; struct timeval timeout = { 0, 0 }; fd_set rfds; int retval; if(!fds) { errno = ENODEV; return -1; } FD_ZERO(&rfds); FD_SET(fds->fdin, &rfds); retval = select(fds->fdin+1, &rfds, NULL, NULL, &timeout); if(retval <= 0) return retval; return read(fds->fdin, buffer, size); } int fd_write(void * data, const char * buffer, int size) { struct fd_channel * fds = (struct fd_channel *)data; if(fds) { return write(fds->fdout, buffer, size); } errno = ENODEV; return -1; } static int fd_isok(void * data) { struct fd_channel * fds = (struct fd_channel *)data; if(fds) { return fds->fdout != -1 && fds->fdin != -1; } return 0; } static int fd_status_fd(int fd, char * str, int size) { if(fd == -1) return snprintf(str, size, "closed"); return snprintf(str, size, "opened(fd=%d)", fd); } char * fd_status(void * data) { static char retval[256]; int index = 0; struct fd_channel * fds = (struct fd_channel *)data; if(fds) { index += snprintf(retval + index, sizeof(retval) - index, "in "); index += fd_status_fd(fds->fdin, retval + index, sizeof(retval) - index); index += snprintf(retval + index, sizeof(retval) - index, "out "); index += fd_status_fd(fds->fdout, retval + index, sizeof(retval) - index); } else { snprintf(retval, sizeof(retval), "(null)"); } return retval; } struct channel_ops fd_channel_ops = { init: fd_init, open: generic_open, close: generic_close, read: fd_read, write: fd_write, free: generic_free, isok: fd_isok, status: fd_status, }; /* * Local variables: * c-file-style: "linux" * End: */
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