SD_BUS_REPLY_METHOD_RETURNV(3)

✨ SD_BUS_REP...HOD_RETURN(3) ✨

okay bestie, so this is the manual for sd_bus_reply_method_return and sd_bus_reply_method_returnv from the sd_bus_reply_method_return manual. it's giving "how do i politely answer a D-Bus method call" energy and honestly? iconic.

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🌸 NAME 🌸

sd_bus_reply_method_return, sd_bus_reply_method_returnv — Reply to a D-Bus method call

like literally, these are the functions you use to send back a reply to someone who called a D-Bus method on you. periodt. 💅

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🎀 SYNOPSIS 🎀

#include <systemd/sd-bus.h>

int sd_bus_reply_method_return(sd_bus_message *call, const char *types,
                               ...);

int sd_bus_reply_method_returnv(sd_bus_message *call, const char *types,
                                va_list ap);

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🦋 DESCRIPTION 🦋

so sd_bus_reply_method_return() sends a reply to the call message. the type string types and the arguments that follow it must adhere to the format described in sd_bus_message_append(3) — no cap, that's the whole vibe. if no reply is expected to call, this function succeeds without sending a reply. lowkey efficient fr fr. ✨

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💖 RETURN VALUE 💖

On success, this function returns a non-negative integer. On failure, it returns a negative errno-style error code. simple as that bestie. 💅

Errors

Returned errors may indicate the following problems — and yes, these all got added in version 246, so they're giving "newer era" energy:

• -EINVAL — The input parameter call is NULL. OR message call is not a method call message. OR message call is not attached to a bus. OR message m is not a method reply message. Added in version 246. 😭
• -EPERM — Message call has been sealed. Added in version 246. 🔥
• -ENOTCONN — The bus to which message call is attached is not connected. Added in version 246. 💀
• -ENOMEM — Memory allocation failed. Added in version 246. 🙈

In addition, any error returned by sd_bus_send(3) may be returned. so like, keep that in mind bestie. 🫶

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🌈 NOTES 🌈

Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd pkg-config(1) file. iykyk. 💜

All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time. different threads may access the same object at different times. multiple independent objects may be used from different threads in parallel. it's giving "you can share but not at the same time" energy. ⭐

⚠️ important vibe check: The code described here uses getenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call setenv(3) from a parallel thread. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started. no cap, this is a real safety thing — don't be chaotic bestie. 😭

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👑 SEE ALSO 👑

systemd(1), sd-bus(3), sd_bus_message_new_method_return(3)

like, go read those if you wanna understand the whole ecosystem. fr fr. 🌸

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🫶 cute sign-off: this page is from systemd 261.3 and the date on the original was that specific one — you know the one. stay slay, stay systemd. 💖✨