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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ERRNO_H
#define _ERRNO_H
#include <slibc/version.h>
#include <slibc/features.h>
/* TODO include error definitions */
/**
* A modifiable lvalue used to describe an error
* that has occurred in the thread.
*/
#define errno (*__errno())
/**
* Helper definition to `errno` used to
* assured that the value is thread-dependent
* and supported on all revisions of C.
*/
volatile int* __errno(void) __GCC_ONLY(__attribute__((__const__))); /* TODO not implemented */
#ifndef _PORTABLE_SOURCE
/**
* This is the name that was used to invoke the program
* running in the current process. This is the value
* of `argv[0]` from the `main` function (where `argv`
* is the second parameter). If `argc` is zero, this
* variable will have the value `NULL`. This is not
* necessarily a proper comman name. For example,
* login shells are usually prefixes with a dash,
* for example "-bash", despite that there is no such
* command. Often, but not always, this will not contain
* directory.
*
* This string may be edited if `program_invocation_short_name`
* or `argv[0]` is edited.
*
* This is a GNU and slibc extension.
*/
#if defined(_GNU_SOURCE) || defined(_SLIBC_SOURCE)
extern char* program_invocation_name; /* TODO not implemented */
#endif
/**
* Variant of `program_invocation_name` that is
* guaranteed to not include the directory.
*
* This string may be edited if `program_invocation_name`
* or `argv[0]` is edited.
*
* This is a GNU extension.
*/
#if defined(_GNU_SOURCE)
extern char* program_invocation_short_name; /* TODO not implemented */
#endif
#endif
#endif
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