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[/] [openrisc/] [tags/] [or1ksim/] [or1ksim-0.5.0rc2/] [peripheral/] [channels/] [fd.c] - Rev 840
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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> Copyright (C) 2008 Embecosm Limited Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> This file is part of Or1ksim, the 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 3 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, see <http://www.gnu.org/licenses/>. */ /* This program is commented throughout in a fashion suitable for processing with Doxygen. */ /* Autoconf and/or portability configuration */ #include "config.h" #include "port.h" /* System includes */ #include <stdlib.h> #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <errno.h> #include <stdio.h> /* Package includes */ #include "fd.h" #include "channel.h" #include "generic.h" /* Forward declarations of static functions */ static void *fd_init (const char *args); static int fd_isok (void *data); static char *fd_status (void *data); /*! Global data structure representing the operations for communicating through a file descriptor channel */ 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, }; 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; } /* Loop, to allow for select being interrupted */ do { FD_ZERO (&rfds); FD_SET (fds->fdin, &rfds); retval = select (fds->fdin + 1, &rfds, NULL, NULL, &timeout); } while ((retval < 0) && (EINTR == errno)); if (retval <= 0) return retval; /* Loop, to allow for select being interrupted */ do { retval = read (fds->fdin, buffer, size); } while ((retval < 0) && (EINTR == errno)); return retval; } 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); } static 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; }
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