133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
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* SPDX-License-Identifier: LGPL-2.0-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "libglnx-config.h"
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#include <glnx-backport-autocleanups.h>
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#include <glnx-errors.h>
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/* Set @error with G_IO_ERROR/G_IO_ERROR_FAILED.
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*
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* This function returns %FALSE so it can be used conveniently in a single
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* statement:
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*
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* ```
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* if (strcmp (foo, "somevalue") != 0)
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* return glnx_throw (error, "key must be somevalue, not '%s'", foo);
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* ```
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*/
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gboolean
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glnx_throw (GError **error,
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const char *fmt,
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...)
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{
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if (error == NULL)
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return FALSE;
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va_list args;
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va_start (args, fmt);
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GError *new = g_error_new_valist (G_IO_ERROR, G_IO_ERROR_FAILED, fmt, args);
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va_end (args);
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g_propagate_error (error, g_steal_pointer (&new));
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return FALSE;
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}
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void
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glnx_real_set_prefix_error_va (GError *error,
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const char *format,
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va_list args)
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{
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if (error == NULL)
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return;
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g_autofree char *old_msg = g_steal_pointer (&error->message);
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g_autoptr(GString) buf = g_string_new ("");
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g_string_append_vprintf (buf, format, args);
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g_string_append (buf, ": ");
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g_string_append (buf, old_msg);
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error->message = g_string_free (g_steal_pointer (&buf), FALSE);
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}
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/* Prepend to @error's message by `$prefix: ` where `$prefix` is computed via
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* printf @fmt. Returns %FALSE so it can be used conveniently in a single
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* statement:
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*
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* ```
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* if (!function_that_fails (s, error))
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* return glnx_throw_prefix (error, "while handling '%s'", s);
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* ```
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* */
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gboolean
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glnx_prefix_error (GError **error,
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const char *fmt,
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...)
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{
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if (error == NULL)
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return FALSE;
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va_list args;
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va_start (args, fmt);
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glnx_real_set_prefix_error_va (*error, fmt, args);
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va_end (args);
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return FALSE;
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}
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void
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glnx_real_set_prefix_error_from_errno_va (GError **error,
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gint errsv,
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const char *format,
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va_list args)
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{
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if (!error)
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return;
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g_set_error_literal (error,
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G_IO_ERROR,
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g_io_error_from_errno (errsv),
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g_strerror (errsv));
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glnx_real_set_prefix_error_va (*error, format, args);
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}
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/* Set @error using the value of `$prefix: g_strerror (errno)` where `$prefix`
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* is computed via printf @fmt.
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*
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* This function returns %FALSE so it can be used conveniently in a single
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* statement:
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*
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* ```
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* return glnx_throw_errno_prefix (error, "unlinking %s", pathname);
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* ```
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*/
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gboolean
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glnx_throw_errno_prefix (GError **error,
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const char *fmt,
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...)
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{
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int errsv = errno;
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va_list args;
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va_start (args, fmt);
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glnx_real_set_prefix_error_from_errno_va (error, errsv, fmt, args);
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va_end (args);
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/* See comment in glnx_throw_errno() about preserving errno */
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errno = errsv;
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return FALSE;
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}
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