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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/libsystemd/sd-bus/bus-error.h | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libsystemd/sd-bus/bus-error.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-error.h b/src/libsystemd/sd-bus/bus-error.h new file mode 100644 index 0000000..c8768c9 --- /dev/null +++ b/src/libsystemd/sd-bus/bus-error.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <stdbool.h> + +#include "sd-bus.h" + +#include "errno-util.h" +#include "macro.h" + +bool bus_error_is_dirty(sd_bus_error *e); + +const char* _bus_error_message(const sd_bus_error *e, int error, char buf[static ERRNO_BUF_LEN]); + +/* Note: the lifetime of the compound literal is the immediately surrounding block, + * see C11 ยง6.5.2.5, and + * https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks */ +#define bus_error_message(e, error) _bus_error_message(e, error, (char[ERRNO_BUF_LEN]){}) + +#define BUS_ERROR_OOM SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_MEMORY, "Out of memory") +#define BUS_ERROR_FAILED SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FAILED, "Operation failed") + +/* + * There are two ways to register error maps with the error translation + * logic: by using BUS_ERROR_MAP_ELF_REGISTER, which however only + * works when linked into the same ELF module, or via + * sd_bus_error_add_map() which is the official, external API, that + * works from any module. + * + * Note that BUS_ERROR_MAP_ELF_REGISTER has to be used as decorator in + * the bus error table, and BUS_ERROR_MAP_ELF_USE has to be used at + * least once per compilation unit (i.e. per library), to ensure that + * the error map is really added to the final binary. + * + * In addition, set the retain attribute so that the section cannot be + * discarded by ld --gc-sections -z start-stop-gc. Older compilers would + * warn for the unknown attribute, so just disable -Wattributes. + */ + +#define BUS_ERROR_MAP_ELF_REGISTER \ + _Pragma("GCC diagnostic ignored \"-Wattributes\"") \ + _section_("SYSTEMD_BUS_ERROR_MAP") \ + _used_ \ + _retain_ \ + _alignptr_ \ + _variable_no_sanitize_address_ + +#define BUS_ERROR_MAP_ELF_USE(errors) \ + extern const sd_bus_error_map errors[]; \ + _used_ \ + static const sd_bus_error_map * const CONCATENATE(errors ## _copy_, __COUNTER__) = errors; + +/* We use something exotic as end marker, to ensure people build the + * maps using the macsd-ros. */ +#define BUS_ERROR_MAP_END_MARKER -'x' + +BUS_ERROR_MAP_ELF_USE(bus_standard_errors); |