| /* 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 Library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library 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. |
| */ |
| |
| #include "glib.h" |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <errno.h> |
| |
| /* |
| * Unix IO Channels |
| */ |
| |
| typedef struct _GIOUnixChannel GIOUnixChannel; |
| typedef struct _GIOUnixWatch GIOUnixWatch; |
| |
| struct _GIOUnixChannel { |
| gint fd; |
| }; |
| |
| struct _GIOUnixWatch { |
| 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 guint g_io_unix_add_watch (GIOChannel *channel, |
| gint priority, |
| GIOCondition condition, |
| GIOFunc func, |
| gpointer user_data, |
| GDestroyNotify notify); |
| static gboolean g_io_unix_prepare (gpointer source_data, |
| GTimeVal *current_time, |
| gint *timeout); |
| static gboolean g_io_unix_check (gpointer source_data, |
| GTimeVal *current_time); |
| static gboolean g_io_unix_dispatch (gpointer source_data, |
| GTimeVal *current_time, |
| gpointer user_data); |
| static void g_io_unix_destroy (gpointer source_data); |
| |
| 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_add_watch, |
| g_io_unix_free, |
| }; |
| |
| static gboolean |
| g_io_unix_prepare (gpointer source_data, |
| GTimeVal *current_time, |
| gint *timeout) |
| { |
| *timeout = -1; |
| return FALSE; |
| } |
| |
| static gboolean |
| g_io_unix_check (gpointer source_data, |
| GTimeVal *current_time) |
| { |
| GIOUnixWatch *data = source_data; |
| |
| return (data->pollfd.revents & data->condition); |
| } |
| |
| static gboolean |
| g_io_unix_dispatch (gpointer source_data, |
| GTimeVal *current_time, |
| gpointer user_data) |
| |
| { |
| GIOUnixWatch *data = source_data; |
| |
| return (*data->callback)(data->channel, |
| data->pollfd.revents & data->condition, |
| user_data); |
| } |
| |
| static void |
| g_io_unix_destroy (gpointer source_data) |
| { |
| GIOUnixWatch *data = source_data; |
| |
| g_main_poll_remove (&data->pollfd); |
| g_io_channel_unref (data->channel); |
| g_free (data); |
| } |
| |
| static GIOError |
| g_io_unix_read (GIOChannel *channel, |
| gchar *buf, |
| guint count, |
| guint *bytes_read) |
| { |
| GIOUnixChannel *unix_channel = channel->channel_data; |
| 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: |
| 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 = channel->channel_data; |
| 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: |
| 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 = channel->channel_data; |
| 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 = channel->channel_data; |
| |
| close (unix_channel->fd); |
| } |
| |
| static void |
| g_io_unix_free (GIOChannel *channel) |
| { |
| GIOUnixChannel *unix_channel = channel->channel_data; |
| |
| g_free (unix_channel); |
| } |
| |
| static guint |
| g_io_unix_add_watch (GIOChannel *channel, |
| gint priority, |
| GIOCondition condition, |
| GIOFunc func, |
| gpointer user_data, |
| GDestroyNotify notify) |
| { |
| GIOUnixWatch *watch = g_new (GIOUnixWatch, 1); |
| GIOUnixChannel *unix_channel = channel->channel_data; |
| |
| watch->channel = channel; |
| g_io_channel_ref (channel); |
| |
| watch->callback = func; |
| watch->condition = condition; |
| |
| watch->pollfd.fd = unix_channel->fd; |
| watch->pollfd.events = condition; |
| |
| g_main_poll_add (priority, &watch->pollfd); |
| |
| return g_source_add (priority, TRUE, &unix_watch_funcs, watch, user_data, notify); |
| } |
| |
| GIOChannel * |
| g_io_channel_unix_new (gint fd) |
| { |
| GIOUnixChannel *unix_channel = g_new (GIOUnixChannel, 1); |
| |
| unix_channel->fd = fd; |
| return g_io_channel_new (&unix_channel_funcs, unix_channel); |
| } |
| |
| gint |
| g_io_channel_unix_get_fd (GIOChannel *channel) |
| { |
| GIOUnixChannel *unix_channel = channel->channel_data; |
| return unix_channel->fd; |
| } |