120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdlib.h>
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#include <string.h>
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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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static inline const char *strerror_safe(int error) {
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/* 'safe' here does NOT mean thread safety. */
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return strerror(abs(error));
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}
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static inline int errno_or_else(int fallback) {
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/* To be used when invoking library calls where errno handling is not defined clearly: we return
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* errno if it is set, and the specified error otherwise. The idea is that the caller initializes
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* errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful
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* error code */
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if (errno > 0)
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return -errno;
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return -abs(fallback);
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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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*
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* Hint #3: When asynchronous connect() on TCP fails because the host never acknowledges a single packet,
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* kernel tells us that with ETIMEDOUT, see tcp(7). */
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static inline bool ERRNO_IS_DISCONNECT(int r) {
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return IN_SET(abs(r),
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ECONNABORTED,
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ECONNREFUSED,
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ECONNRESET,
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EHOSTDOWN,
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EHOSTUNREACH,
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ENETDOWN,
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ENETRESET,
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ENETUNREACH,
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ENONET,
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ENOPROTOOPT,
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ENOTCONN,
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EPIPE,
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EPROTO,
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ESHUTDOWN,
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ETIMEDOUT);
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}
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/* Transient errors we might get on accept() that we should ignore. As per error handling comment in
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* the accept(2) man page. */
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static inline bool ERRNO_IS_ACCEPT_AGAIN(int r) {
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return ERRNO_IS_DISCONNECT(r) ||
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IN_SET(abs(r),
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EAGAIN,
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EINTR,
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EOPNOTSUPP);
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}
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/* Resource exhaustion, could be our fault or general system trouble */
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static inline bool ERRNO_IS_RESOURCE(int r) {
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return IN_SET(abs(r),
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EMFILE,
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ENFILE,
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ENOMEM);
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}
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/* Seven different errors for "operation/system call/ioctl/socket feature not supported" */
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static inline bool ERRNO_IS_NOT_SUPPORTED(int r) {
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return IN_SET(abs(r),
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EOPNOTSUPP,
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ENOTTY,
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ENOSYS,
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EAFNOSUPPORT,
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EPFNOSUPPORT,
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EPROTONOSUPPORT,
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ESOCKTNOSUPPORT);
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}
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/* Two different errors for access problems */
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static inline bool ERRNO_IS_PRIVILEGE(int r) {
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return IN_SET(abs(r),
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EACCES,
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EPERM);
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}
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/* Three difference errors for "not enough disk space" */
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static inline bool ERRNO_IS_DISK_SPACE(int r) {
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return IN_SET(abs(r),
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ENOSPC,
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EDQUOT,
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EFBIG);
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}
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