30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include "macro.h"
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static inline void _reset_errno_(int *saved_errno) {
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if (*saved_errno < 0) /* Invalidated by UNPROTECT_ERRNO? */
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return;
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errno = *saved_errno;
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}
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#define PROTECT_ERRNO \
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_cleanup_(_reset_errno_) _unused_ int _saved_errno_ = errno
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#define UNPROTECT_ERRNO \
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do { \
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errno = _saved_errno_; \
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_saved_errno_ = -1; \
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} while (false)
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static inline int negative_errno(void) {
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/* This helper should be used to shut up gcc if you know 'errno' is
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* negative. Instead of "return -errno;", use "return negative_errno();"
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* It will suppress bogus gcc warnings in case it assumes 'errno' might
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* be 0 and thus the caller's error-handling might not be triggered. */
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assert_return(errno > 0, -EINVAL);
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return -errno;
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}
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