blob: 070ec0ae35f5fa6b54e8a327c38a112d808620c7 [file] [log] [blame]
/*
* Copyright (c) 2015 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/** @file
*
* @brief Per-thread errno accessor function
*
* Allow accessing the errno for the current thread without involving the
* context switching.
*/
#include <kernel_structs.h>
#include <syscall_handler.h>
/*
* Define _k_neg_eagain for use in assembly files as errno.h is
* not assembly language safe.
* FIXME: wastes 4 bytes
*/
const int _k_neg_eagain = -EAGAIN;
#ifdef CONFIG_ERRNO
#ifdef CONFIG_USERSPACE
int *_impl_z_errno(void)
{
/* Initialized to the lowest address in the stack so the thread can
* directly read/write it
*/
return &_current->userspace_local_data->errno_var;
}
Z_SYSCALL_HANDLER0_SIMPLE(z_errno);
#else
int *_impl_z_errno(void)
{
return &_current->errno_var;
}
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_ERRNO */