/* GLIB - Library of useful routines for C programming * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * giounix.c: IO Channels using unix file descriptors * Copyright 1998 Owen Taylor * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GLib Team and others 1997-2000. See the AUTHORS * file for a list of people on the GLib Team. See the ChangeLog * files for a list of changes. These files are distributed with * GLib at ftp://ftp.gtk.org/pub/gtk/. */ /* * MT safe */ #include "glib.h" #include #include #include /* * Unix IO Channels */ typedef struct _GIOUnixChannel GIOUnixChannel; typedef struct _GIOUnixWatch GIOUnixWatch; struct _GIOUnixChannel { GIOChannel channel; gint fd; }; struct _GIOUnixWatch { GSource source; GPollFD pollfd; GIOChannel *channel; GIOCondition condition; GIOFunc callback; }; static GIOError g_io_unix_read (GIOChannel *channel, gchar *buf, guint count, guint *bytes_written); static GIOError g_io_unix_write (GIOChannel *channel, gchar *buf, guint count, guint *bytes_written); static GIOError g_io_unix_seek (GIOChannel *channel, gint offset, GSeekType type); static void g_io_unix_close (GIOChannel *channel); static void g_io_unix_free (GIOChannel *channel); static GSource *g_io_unix_create_watch (GIOChannel *channel, GIOCondition condition); static gboolean g_io_unix_prepare (GSource *source, gint *timeout); static gboolean g_io_unix_check (GSource *source); static gboolean g_io_unix_dispatch (GSource *source, GSourceFunc callback, gpointer user_data); static void g_io_unix_destroy (GSource *source); GSourceFuncs unix_watch_funcs = { g_io_unix_prepare, g_io_unix_check, g_io_unix_dispatch, g_io_unix_destroy }; GIOFuncs unix_channel_funcs = { g_io_unix_read, g_io_unix_write, g_io_unix_seek, g_io_unix_close, g_io_unix_create_watch, g_io_unix_free, }; static gboolean g_io_unix_prepare (GSource *source, gint *timeout) { *timeout = -1; return FALSE; } static gboolean g_io_unix_check (GSource *source) { GIOUnixWatch *watch = (GIOUnixWatch *)source; return (watch->pollfd.revents & watch->condition); } static gboolean g_io_unix_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { GIOFunc func = (GIOFunc)callback; GIOUnixWatch *watch = (GIOUnixWatch *)source; if (!func) { g_warning ("IO watch dispatched without callback\n" "You must call g_source_connect()."); return FALSE; } return (*func) (watch->channel, watch->pollfd.revents & watch->condition, user_data); } static void g_io_unix_destroy (GSource *source) { GIOUnixWatch *watch = (GIOUnixWatch *)source; g_io_channel_unref (watch->channel); } static GIOError g_io_unix_read (GIOChannel *channel, gchar *buf, guint count, guint *bytes_read) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; gint result; result = read (unix_channel->fd, buf, count); if (result < 0) { *bytes_read = 0; switch (errno) { case EINVAL: return G_IO_ERROR_INVAL; case EAGAIN: case EINTR: return G_IO_ERROR_AGAIN; default: return G_IO_ERROR_UNKNOWN; } } else { *bytes_read = result; return G_IO_ERROR_NONE; } } static GIOError g_io_unix_write(GIOChannel *channel, gchar *buf, guint count, guint *bytes_written) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; gint result; result = write (unix_channel->fd, buf, count); if (result < 0) { *bytes_written = 0; switch (errno) { case EINVAL: return G_IO_ERROR_INVAL; case EAGAIN: case EINTR: return G_IO_ERROR_AGAIN; default: return G_IO_ERROR_UNKNOWN; } } else { *bytes_written = result; return G_IO_ERROR_NONE; } } static GIOError g_io_unix_seek (GIOChannel *channel, gint offset, GSeekType type) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; int whence; off_t result; switch (type) { case G_SEEK_SET: whence = SEEK_SET; break; case G_SEEK_CUR: whence = SEEK_CUR; break; case G_SEEK_END: whence = SEEK_END; break; default: g_warning ("g_io_unix_seek: unknown seek type"); return G_IO_ERROR_UNKNOWN; } result = lseek (unix_channel->fd, offset, whence); if (result < 0) { switch (errno) { case EINVAL: return G_IO_ERROR_INVAL; default: return G_IO_ERROR_UNKNOWN; } } else return G_IO_ERROR_NONE; } static void g_io_unix_close (GIOChannel *channel) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; close (unix_channel->fd); } static void g_io_unix_free (GIOChannel *channel) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; g_free (unix_channel); } static GSource * g_io_unix_create_watch (GIOChannel *channel, GIOCondition condition) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; GSource *source; GIOUnixWatch *watch; source = g_source_new (&unix_watch_funcs, sizeof (GIOUnixWatch)); watch = (GIOUnixWatch *)source; watch->channel = channel; g_io_channel_ref (channel); watch->condition = condition; watch->pollfd.fd = unix_channel->fd; watch->pollfd.events = condition; g_source_add_poll (source, &watch->pollfd); return source; } GIOChannel * g_io_channel_unix_new (gint fd) { GIOUnixChannel *unix_channel = g_new (GIOUnixChannel, 1); GIOChannel *channel = (GIOChannel *)unix_channel; g_io_channel_init (channel); channel->funcs = &unix_channel_funcs; unix_channel->fd = fd; return channel; } gint g_io_channel_unix_get_fd (GIOChannel *channel) { GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; return unix_channel->fd; }