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-rw-r--r--glib/glib/giounix.c658
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diff --git a/glib/glib/giounix.c b/glib/glib/giounix.c
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+/* 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 "config.h"
+
+#define _POSIX_SOURCE /* for SSIZE_MAX */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "giochannel.h"
+
+#include "gerror.h"
+#include "gfileutils.h"
+#include "gstrfuncs.h"
+#include "gtestutils.h"
+
+/*
+ * 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;
+};
+
+
+static GIOStatus g_io_unix_read (GIOChannel *channel,
+ gchar *buf,
+ gsize count,
+ gsize *bytes_read,
+ GError **err);
+static GIOStatus g_io_unix_write (GIOChannel *channel,
+ const gchar *buf,
+ gsize count,
+ gsize *bytes_written,
+ GError **err);
+static GIOStatus g_io_unix_seek (GIOChannel *channel,
+ gint64 offset,
+ GSeekType type,
+ GError **err);
+static GIOStatus g_io_unix_close (GIOChannel *channel,
+ GError **err);
+static void g_io_unix_free (GIOChannel *channel);
+static GSource* g_io_unix_create_watch (GIOChannel *channel,
+ GIOCondition condition);
+static GIOStatus g_io_unix_set_flags (GIOChannel *channel,
+ GIOFlags flags,
+ GError **err);
+static GIOFlags g_io_unix_get_flags (GIOChannel *channel);
+
+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_finalize (GSource *source);
+
+GSourceFuncs g_io_watch_funcs = {
+ g_io_unix_prepare,
+ g_io_unix_check,
+ g_io_unix_dispatch,
+ g_io_unix_finalize
+};
+
+static 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,
+ g_io_unix_set_flags,
+ g_io_unix_get_flags,
+};
+
+static gboolean
+g_io_unix_prepare (GSource *source,
+ gint *timeout)
+{
+ GIOUnixWatch *watch = (GIOUnixWatch *)source;
+ GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);
+
+ *timeout = -1;
+
+ /* Only return TRUE here if _all_ bits in watch->condition will be set
+ */
+ return ((watch->condition & buffer_condition) == watch->condition);
+}
+
+static gboolean
+g_io_unix_check (GSource *source)
+{
+ GIOUnixWatch *watch = (GIOUnixWatch *)source;
+ GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);
+ GIOCondition poll_condition = watch->pollfd.revents;
+
+ return ((poll_condition | buffer_condition) & watch->condition);
+}
+
+static gboolean
+g_io_unix_dispatch (GSource *source,
+ GSourceFunc callback,
+ gpointer user_data)
+
+{
+ GIOFunc func = (GIOFunc)callback;
+ GIOUnixWatch *watch = (GIOUnixWatch *)source;
+ GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);
+
+ 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 | buffer_condition) & watch->condition,
+ user_data);
+}
+
+static void
+g_io_unix_finalize (GSource *source)
+{
+ GIOUnixWatch *watch = (GIOUnixWatch *)source;
+
+ g_io_channel_unref (watch->channel);
+}
+
+static GIOStatus
+g_io_unix_read (GIOChannel *channel,
+ gchar *buf,
+ gsize count,
+ gsize *bytes_read,
+ GError **err)
+{
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;
+ gssize result;
+
+ if (count > SSIZE_MAX) /* At least according to the Debian manpage for read */
+ count = SSIZE_MAX;
+
+ retry:
+ result = read (unix_channel->fd, buf, count);
+
+ if (result < 0)
+ {
+ int errsv = errno;
+ *bytes_read = 0;
+
+ switch (errsv)
+ {
+#ifdef EINTR
+ case EINTR:
+ goto retry;
+#endif
+#ifdef EAGAIN
+ case EAGAIN:
+ return G_IO_STATUS_AGAIN;
+#endif
+ default:
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (errsv),
+ g_strerror (errsv));
+ return G_IO_STATUS_ERROR;
+ }
+ }
+
+ *bytes_read = result;
+
+ return (result > 0) ? G_IO_STATUS_NORMAL : G_IO_STATUS_EOF;
+}
+
+static GIOStatus
+g_io_unix_write (GIOChannel *channel,
+ const gchar *buf,
+ gsize count,
+ gsize *bytes_written,
+ GError **err)
+{
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;
+ gssize result;
+
+ retry:
+ result = write (unix_channel->fd, buf, count);
+
+ if (result < 0)
+ {
+ int errsv = errno;
+ *bytes_written = 0;
+
+ switch (errsv)
+ {
+#ifdef EINTR
+ case EINTR:
+ goto retry;
+#endif
+#ifdef EAGAIN
+ case EAGAIN:
+ return G_IO_STATUS_AGAIN;
+#endif
+ default:
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (errsv),
+ g_strerror (errsv));
+ return G_IO_STATUS_ERROR;
+ }
+ }
+
+ *bytes_written = result;
+
+ return G_IO_STATUS_NORMAL;
+}
+
+static GIOStatus
+g_io_unix_seek (GIOChannel *channel,
+ gint64 offset,
+ GSeekType type,
+ GError **err)
+{
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;
+ int whence;
+ off_t tmp_offset;
+ 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:
+ whence = -1; /* Shut the compiler up */
+ g_assert_not_reached ();
+ }
+
+ tmp_offset = offset;
+ if (tmp_offset != offset)
+ {
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (EINVAL),
+ g_strerror (EINVAL));
+ return G_IO_STATUS_ERROR;
+ }
+
+ result = lseek (unix_channel->fd, tmp_offset, whence);
+
+ if (result < 0)
+ {
+ int errsv = errno;
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (errsv),
+ g_strerror (errsv));
+ return G_IO_STATUS_ERROR;
+ }
+
+ return G_IO_STATUS_NORMAL;
+}
+
+
+static GIOStatus
+g_io_unix_close (GIOChannel *channel,
+ GError **err)
+{
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;
+
+ if (close (unix_channel->fd) < 0)
+ {
+ int errsv = errno;
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (errsv),
+ g_strerror (errsv));
+ return G_IO_STATUS_ERROR;
+ }
+
+ return G_IO_STATUS_NORMAL;
+}
+
+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 (&g_io_watch_funcs, sizeof (GIOUnixWatch));
+ g_source_set_name (source, "GIOChannel (Unix)");
+ 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;
+}
+
+static GIOStatus
+g_io_unix_set_flags (GIOChannel *channel,
+ GIOFlags flags,
+ GError **err)
+{
+ glong fcntl_flags;
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *) channel;
+
+ fcntl_flags = 0;
+
+ if (flags & G_IO_FLAG_APPEND)
+ fcntl_flags |= O_APPEND;
+ if (flags & G_IO_FLAG_NONBLOCK)
+#ifdef O_NONBLOCK
+ fcntl_flags |= O_NONBLOCK;
+#else
+ fcntl_flags |= O_NDELAY;
+#endif
+
+ if (fcntl (unix_channel->fd, F_SETFL, fcntl_flags) == -1)
+ {
+ int errsv = errno;
+ g_set_error_literal (err, G_IO_CHANNEL_ERROR,
+ g_io_channel_error_from_errno (errsv),
+ g_strerror (errsv));
+ return G_IO_STATUS_ERROR;
+ }
+
+ return G_IO_STATUS_NORMAL;
+}
+
+static GIOFlags
+g_io_unix_get_flags (GIOChannel *channel)
+{
+ GIOFlags flags = 0;
+ glong fcntl_flags;
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *) channel;
+
+ fcntl_flags = fcntl (unix_channel->fd, F_GETFL);
+
+ if (fcntl_flags == -1)
+ {
+ int err = errno;
+ g_warning (G_STRLOC "Error while getting flags for FD: %s (%d)\n",
+ g_strerror (err), err);
+ return 0;
+ }
+
+ if (fcntl_flags & O_APPEND)
+ flags |= G_IO_FLAG_APPEND;
+#ifdef O_NONBLOCK
+ if (fcntl_flags & O_NONBLOCK)
+#else
+ if (fcntl_flags & O_NDELAY)
+#endif
+ flags |= G_IO_FLAG_NONBLOCK;
+
+ switch (fcntl_flags & (O_RDONLY | O_WRONLY | O_RDWR))
+ {
+ case O_RDONLY:
+ channel->is_readable = TRUE;
+ channel->is_writeable = FALSE;
+ break;
+ case O_WRONLY:
+ channel->is_readable = FALSE;
+ channel->is_writeable = TRUE;
+ break;
+ case O_RDWR:
+ channel->is_readable = TRUE;
+ channel->is_writeable = TRUE;
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+
+ return flags;
+}
+
+GIOChannel *
+g_io_channel_new_file (const gchar *filename,
+ const gchar *mode,
+ GError **error)
+{
+ int fid, flags;
+ mode_t create_mode;
+ GIOChannel *channel;
+ enum { /* Cheesy hack */
+ MODE_R = 1 << 0,
+ MODE_W = 1 << 1,
+ MODE_A = 1 << 2,
+ MODE_PLUS = 1 << 3,
+ MODE_R_PLUS = MODE_R | MODE_PLUS,
+ MODE_W_PLUS = MODE_W | MODE_PLUS,
+ MODE_A_PLUS = MODE_A | MODE_PLUS
+ } mode_num;
+ struct stat buffer;
+
+ g_return_val_if_fail (filename != NULL, NULL);
+ g_return_val_if_fail (mode != NULL, NULL);
+ g_return_val_if_fail ((error == NULL) || (*error == NULL), NULL);
+
+ switch (mode[0])
+ {
+ case 'r':
+ mode_num = MODE_R;
+ break;
+ case 'w':
+ mode_num = MODE_W;
+ break;
+ case 'a':
+ mode_num = MODE_A;
+ break;
+ default:
+ g_warning ("Invalid GIOFileMode %s.\n", mode);
+ return NULL;
+ }
+
+ switch (mode[1])
+ {
+ case '\0':
+ break;
+ case '+':
+ if (mode[2] == '\0')
+ {
+ mode_num |= MODE_PLUS;
+ break;
+ }
+ /* Fall through */
+ default:
+ g_warning ("Invalid GIOFileMode %s.\n", mode);
+ return NULL;
+ }
+
+ switch (mode_num)
+ {
+ case MODE_R:
+ flags = O_RDONLY;
+ break;
+ case MODE_W:
+ flags = O_WRONLY | O_TRUNC | O_CREAT;
+ break;
+ case MODE_A:
+ flags = O_WRONLY | O_APPEND | O_CREAT;
+ break;
+ case MODE_R_PLUS:
+ flags = O_RDWR;
+ break;
+ case MODE_W_PLUS:
+ flags = O_RDWR | O_TRUNC | O_CREAT;
+ break;
+ case MODE_A_PLUS:
+ flags = O_RDWR | O_APPEND | O_CREAT;
+ break;
+ case MODE_PLUS:
+ default:
+ g_assert_not_reached ();
+ flags = 0;
+ }
+
+ create_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+
+ do
+ {
+ fid = open (filename, flags, create_mode);
+ }
+ while (fid == -1 && errno == EINTR);
+
+ if (fid == -1)
+ {
+ int err = errno;
+ g_set_error_literal (error, G_FILE_ERROR,
+ g_file_error_from_errno (err),
+ g_strerror (err));
+ return (GIOChannel *)NULL;
+ }
+
+ if (fstat (fid, &buffer) == -1) /* In case someone opens a FIFO */
+ {
+ int err = errno;
+ close (fid);
+ g_set_error_literal (error, G_FILE_ERROR,
+ g_file_error_from_errno (err),
+ g_strerror (err));
+ return (GIOChannel *)NULL;
+ }
+
+ channel = (GIOChannel *) g_new (GIOUnixChannel, 1);
+
+ channel->is_seekable = S_ISREG (buffer.st_mode) || S_ISCHR (buffer.st_mode)
+ || S_ISBLK (buffer.st_mode);
+
+ switch (mode_num)
+ {
+ case MODE_R:
+ channel->is_readable = TRUE;
+ channel->is_writeable = FALSE;
+ break;
+ case MODE_W:
+ case MODE_A:
+ channel->is_readable = FALSE;
+ channel->is_writeable = TRUE;
+ break;
+ case MODE_R_PLUS:
+ case MODE_W_PLUS:
+ case MODE_A_PLUS:
+ channel->is_readable = TRUE;
+ channel->is_writeable = TRUE;
+ break;
+ case MODE_PLUS:
+ default:
+ g_assert_not_reached ();
+ }
+
+ g_io_channel_init (channel);
+ channel->close_on_unref = TRUE; /* must be after g_io_channel_init () */
+ channel->funcs = &unix_channel_funcs;
+
+ ((GIOUnixChannel *) channel)->fd = fid;
+ return channel;
+}
+
+/**
+ * g_io_channel_unix_new:
+ * @fd: a file descriptor.
+ * @Returns: a new #GIOChannel.
+ *
+ * Creates a new #GIOChannel given a file descriptor. On UNIX systems
+ * this works for plain files, pipes, and sockets.
+ *
+ * The returned #GIOChannel has a reference count of 1.
+ *
+ * The default encoding for #GIOChannel is UTF-8. If your application
+ * is reading output from a command using via pipe, you may need to set
+ * the encoding to the encoding of the current locale (see
+ * g_get_charset()) with the g_io_channel_set_encoding() function.
+ *
+ * If you want to read raw binary data without interpretation, then
+ * call the g_io_channel_set_encoding() function with %NULL for the
+ * encoding argument.
+ *
+ * This function is available in GLib on Windows, too, but you should
+ * avoid using it on Windows. The domain of file descriptors and
+ * sockets overlap. There is no way for GLib to know which one you mean
+ * in case the argument you pass to this function happens to be both a
+ * valid file descriptor and socket. If that happens a warning is
+ * issued, and GLib assumes that it is the file descriptor you mean.
+ **/
+GIOChannel *
+g_io_channel_unix_new (gint fd)
+{
+ struct stat buffer;
+ 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;
+
+ /* I'm not sure if fstat on a non-file (e.g., socket) works
+ * it should be safe to say if it fails, the fd isn't seekable.
+ */
+ /* Newer UNIX versions support S_ISSOCK(), fstat() will probably
+ * succeed in most cases.
+ */
+ if (fstat (unix_channel->fd, &buffer) == 0)
+ channel->is_seekable = S_ISREG (buffer.st_mode) || S_ISCHR (buffer.st_mode)
+ || S_ISBLK (buffer.st_mode);
+ else /* Assume not seekable */
+ channel->is_seekable = FALSE;
+
+ g_io_unix_get_flags (channel); /* Sets is_readable, is_writeable */
+
+ return channel;
+}
+
+/**
+ * g_io_channel_unix_get_fd:
+ * @channel: a #GIOChannel, created with g_io_channel_unix_new().
+ * @Returns: the file descriptor of the #GIOChannel.
+ *
+ * Returns the file descriptor of the #GIOChannel.
+ *
+ * On Windows this function returns the file descriptor or socket of
+ * the #GIOChannel.
+ **/
+gint
+g_io_channel_unix_get_fd (GIOChannel *channel)
+{
+ GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;
+ return unix_channel->fd;
+}
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