From 2e5fa45ddfbb5cffa1e78221f1cea706e2f298af Mon Sep 17 00:00:00 2001 From: Michael Biebl Date: Wed, 31 Jul 2019 10:51:42 +0200 Subject: New upstream version 1.19.90 --- shared/systemd/src/basic/errno-util.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'shared/systemd/src/basic/errno-util.h') diff --git a/shared/systemd/src/basic/errno-util.h b/shared/systemd/src/basic/errno-util.h index d7a5ea77..6053cde6 100644 --- a/shared/systemd/src/basic/errno-util.h +++ b/shared/systemd/src/basic/errno-util.h @@ -1,6 +1,9 @@ /* SPDX-License-Identifier: LGPL-2.1+ */ #pragma once +#include +#include + #include "macro.h" static inline void _reset_errno_(int *saved_errno) { @@ -28,6 +31,22 @@ static inline int negative_errno(void) { return -errno; } +static inline const char *strerror_safe(int error) { + /* 'safe' here does NOT mean thread safety. */ + return strerror(abs(error)); +} + +static inline int errno_or_else(int fallback) { + /* To be used when invoking library calls where errno handling is not defined clearly: we return + * errno if it is set, and the specified error otherwise. The idea is that the caller initializes + * errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful + * error code */ + if (errno > 0) + return -errno; + + return -abs(fallback); +} + /* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5. * * Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases. See the -- cgit 1.3.0-6-gf8a5