43 lines
1.7 KiB
C
43 lines
1.7 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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/* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5.
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*
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* Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases. See the
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* icmp_err_convert[] in net/ipv4/icmp.c in the kernel sources */
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#define ERRNO_IS_DISCONNECT(r) \
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IN_SET(abs(r), \
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ENOTCONN, ECONNRESET, ECONNREFUSED, ECONNABORTED, EPIPE, \
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ENETUNREACH, EHOSTUNREACH, ENOPROTOOPT, EHOSTDOWN, ENONET)
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/* Resource exhaustion, could be our fault or general system trouble */
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#define ERRNO_IS_RESOURCE(r) \
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IN_SET(abs(r), ENOMEM, EMFILE, ENFILE)
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