58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
/*
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* Copyright (c) 2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/** @file
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*
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* @brief Per-thread errno accessor function
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*
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* Allow accessing the errno for the current thread without involving the
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* context switching.
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/syscall_handler.h>
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/*
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* Define _k_neg_eagain for use in assembly files as errno.h is
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* not assembly language safe.
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* FIXME: wastes 4 bytes
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*/
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const int _k_neg_eagain = -EAGAIN;
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#ifdef CONFIG_ERRNO
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#if defined(CONFIG_LIBC_ERRNO)
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/* nothing needed here */
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#elif defined(CONFIG_ERRNO_IN_TLS)
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__thread int z_errno_var;
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#else
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#ifdef CONFIG_USERSPACE
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int *z_impl_z_errno(void)
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{
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/* Initialized to the lowest address in the stack so the thread can
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* directly read/write it
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*/
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return &_current->userspace_local_data->errno_var;
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}
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static inline int *z_vrfy_z_errno(void)
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{
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return z_impl_z_errno();
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}
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#include <syscalls/z_errno_mrsh.c>
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#else
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int *z_impl_z_errno(void)
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{
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return &_current->errno_var;
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}
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#endif /* CONFIG_USERSPACE */
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#endif /* CONFIG_ERRNO_IN_TLS */
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#endif /* CONFIG_ERRNO */
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