43 lines
846 B
C
43 lines
846 B
C
/*
|
|
* 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->errno_location;
|
|
}
|
|
|
|
Z_SYSCALL_HANDLER0_SIMPLE(z_errno);
|
|
#else
|
|
int *_impl_z_errno(void)
|
|
{
|
|
return &_current->errno_var;
|
|
}
|
|
#endif /* CONFIG_USERSPACE */
|
|
#endif /* CONFIG_ERRNO */
|