ossp-pkg/pth/pth_errno.c
1.29
/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2007 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** 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 2.1 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, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_errno.c: Pth errno support
*/
/* Steinbach's Guideline for Systems Programming:
``Never test for an error condition
you don't know how to handle.'' */
#include "pth_p.h"
#if cpp
/* enclose errno in a block */
#define pth_shield \
for ( pth_errno_storage = errno, \
pth_errno_flag = TRUE; \
pth_errno_flag; \
errno = pth_errno_storage, \
pth_errno_flag = FALSE )
/* return plus setting an errno value */
#if defined(PTH_DEBUG)
#define pth_error(return_val,errno_val) \
(errno = (errno_val), \
pth_debug4("return 0x%lx with errno %d(\"%s\")", \
(unsigned long)(return_val), (errno), strerror((errno))), \
(return_val))
#else
#define pth_error(return_val,errno_val) \
(errno = (errno_val), (return_val))
#endif
#endif /* cpp */
intern int pth_errno_storage = 0;
intern int pth_errno_flag = 0;
