diff options
Diffstat (limited to 'glib-1.2.10/giounix.c')
| -rw-r--r-- | glib-1.2.10/giounix.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/glib-1.2.10/giounix.c b/glib-1.2.10/giounix.c new file mode 100644 index 0000000..1085275 --- /dev/null +++ b/glib-1.2.10/giounix.c @@ -0,0 +1,313 @@ +/* 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. + */ + +/* + * Modified by the GLib Team and others 1997-1999. 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 <sys/types.h> +#include <unistd.h> +#include <errno.h> + +/* + * Unix IO Channels + */ + +typedef struct _GIOUnixChannel GIOUnixChannel; +typedef struct _GIOUnixWatch GIOUnixWatch; + +struct _GIOUnixChannel { + GIOChannel channel; + 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, + gpointer user_data); +static gboolean g_io_unix_check (gpointer source_data, + GTimeVal *current_time, + gpointer user_data); +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, + gpointer user_data) +{ + *timeout = -1; + return FALSE; +} + +static gboolean +g_io_unix_check (gpointer source_data, + GTimeVal *current_time, + gpointer user_data) +{ + 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_remove_poll (&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 = (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: + 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: + 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 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 = (GIOUnixChannel *)channel; + + 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_add_poll (&watch->pollfd, priority); + + 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); + 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; +} |