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sd_bus_error_add_map(3) — Linux manual page

SD_BUS_ERROR_ADD_MAP(3)    sd_bus_error_add_mapSD_BUS_ERROR_ADD_MAP(3)

NAME        top

       sd_bus_error_add_map, sd_bus_error_map, SD_BUS_ERROR_MAP,       SD_BUS_ERROR_END - Additional sd-dbus error mappings

SYNOPSIS        top

#include <systemd/sd-bus.h>typedef struct {const char *name;int code;...} sd_bus_error_map;SD_BUS_ERROR_MAP(name,code)SD_BUS_ERROR_MAP_ENDint sd_bus_error_add_map(const sd_bus_error_map *map);

DESCRIPTION        top

       Thesd_bus_error_add_map()call may be used to register additional       mappings for converting D-Bus errors to Linuxerrno-style errors.       The mappings defined with this call are consulted by calls such assd_bus_error_set(3) orsd_bus_error_get_errno(3). By default, a       number of generic, standardized mappings are known, as documented       insd-bus-errors(3). Use this call to add further,       application-specific mappings.       The function takes a pointer to an array of sd_bus_error_map       structures. A reference to the specified array is added to the       lookup tables for error mappings. Note that the structure is not       copied, and that it is hence essential that the array stays       available and constant during the entire remaining runtime of the       process.       The mapping array should be put together with a series ofSD_BUS_ERROR_MAP()macro invocations that take a literal name       string and a (positive)errno-style error number. The last entry       of the array should be an invocation of theSD_BUS_ERROR_MAP_END       macro. The array should not be put together without use of these       two macros.       Note that the call is idempotent: it is safe to invoke it multiple       times with the parameter, which will only add the passed mapping       array once.       Note that the memory allocated by this call is not intended to be       freed during the lifetime of the process. It should not be freed       explicitly.

RETURN VALUE        top

sd_bus_error_add_map()returns a positive value when the new array       was added to the lookup tables. It returns zero when the same       array was already added before. On error, a negativeerrno-style       error code is returned. See below for known error codes.Errors       Returned errors may indicate the following problems:-EINVAL           The specified mapping array is invalid.-ENOMEM           Memory allocation failed.

NOTES        top

       Functions described here are available as a shared library, which       can be compiled against and linked to with thelibsystemd pkg-config(1) file.       The code described here usesgetenv(3), which is declared to be       not multi-thread-safe. This means that the code calling the       functions described here must not callsetenv(3) from a parallel       thread. It is recommended to only do calls tosetenv()from an       early phase of the program when no other threads have been       started.

HISTORY        top

sd_bus_error_add_map()was added in version 221.

SEE ALSO        top

systemd(1),sd-bus(3),sd_bus_error(3),sd-bus-errors(3),errno(3),strerror_r(3)

COLOPHON        top

       This page is part of thesystemd (systemd system and service       manager) project.  Information about the project can be found at       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a       bug report for this manual page, see       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.       This page was obtained from the project's upstream Git repository       ⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11.  (At that       time, the date of the most recent commit that was found in the       repository was 2025-08-11.)  If you discover any rendering       problems in this HTML version of the page, or you believe there is       a better or more up-to-date source for the page, or you have       corrections or improvements to the information in this COLOPHON       (which isnot part of the original manual page), send a mail to       man-pages@man7.orgsystemd 258~rc2SD_BUS_ERROR_ADD_MAP(3)

Pages that refer to this page:sd-bus(3), sd_bus_error(3), sd_bus_message_get_type(3), systemd.directives(7), systemd.index(7)

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