126 lines
3.9 KiB
C
126 lines
3.9 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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*
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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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#pragma once
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#include <glnx-backport-autocleanups.h>
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#include <errno.h>
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G_BEGIN_DECLS
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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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static inline gboolean G_GNUC_PRINTF (2,3)
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glnx_throw (GError **error, const char *fmt, ...)
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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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/* Set @error using the value of `g_strerror (errno)`.
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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 (unlinkat (fd, somepathname) < 0)
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* return glnx_throw_errno (error);
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* ```
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*/
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static inline gboolean
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glnx_throw_errno (GError **error)
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{
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/* Save the value of errno, in case one of the
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* intermediate function calls happens to set it.
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*/
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int errsv = errno;
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g_set_error_literal (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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g_strerror (errsv));
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/* We also restore the value of errno, since that's
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* what was done in a long-ago libgsystem commit
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* https://git.gnome.org/browse/libgsystem/commit/?id=ed106741f7a0596dc8b960b31fdae671d31d666d
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* but I certainly can't remember now why I did that.
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*/
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errno = errsv;
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return FALSE;
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}
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/* Implementation detail of glnx_throw_errno_prefix() */
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void 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) G_GNUC_PRINTF (3,0);
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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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static inline gboolean G_GNUC_PRINTF (2,3)
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glnx_throw_errno_prefix (GError **error, const char *fmt, ...)
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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 above about preserving errno */
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errno = errsv;
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return FALSE;
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}
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/* BEGIN LEGACY APIS */
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#define glnx_set_error_from_errno(error) \
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do { \
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glnx_throw_errno (error); \
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} while (0);
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#define glnx_set_prefix_error_from_errno(error, format, args...) \
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do { \
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glnx_set_error_from_errno (error); \
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g_prefix_error (error, format, args); \
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} while (0);
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G_END_DECLS
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