4fc00cae7a
For a library which already provides a multi-thread aware errno, use that instead of creating our own internal value. Signed-off-by: Keith Packard <keithp@keithp.com>
58 lines
1.1 KiB
C
58 lines
1.1 KiB
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 <zephyr/kernel.h>
|
|
#include <zephyr/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
|
|
|
|
#if defined(CONFIG_LIBC_ERRNO)
|
|
/* nothing needed here */
|
|
#elif defined(CONFIG_ERRNO_IN_TLS)
|
|
__thread int z_errno_var;
|
|
#else
|
|
|
|
#ifdef CONFIG_USERSPACE
|
|
int *z_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;
|
|
}
|
|
|
|
static inline int *z_vrfy_z_errno(void)
|
|
{
|
|
return z_impl_z_errno();
|
|
}
|
|
#include <syscalls/z_errno_mrsh.c>
|
|
|
|
#else
|
|
int *z_impl_z_errno(void)
|
|
{
|
|
return &_current->errno_var;
|
|
}
|
|
#endif /* CONFIG_USERSPACE */
|
|
|
|
#endif /* CONFIG_ERRNO_IN_TLS */
|
|
|
|
#endif /* CONFIG_ERRNO */
|