RDMA_CRE...T_CHANNEL(3)

💖 rdma_create_event_channel — open a channel used to report communication events 💖

okay bestie, so this is a librdmacm page, like from the Programmer's Manual, and it's genuinely so chill. it's literally one function. one. you got this. 🫶

✨ SYNOPSIS ✨

the vibe is: you include this header, you call this thing, no arguments, no drama.

#include <rdma/rdma_cma.h>

struct rdma_event_channel * rdma_create_event_channel (void);

🎀 ARGUMENTS 🎀

• void — no arguments. nothing. nada. it takes zero things. an empty plate. iconic of it honestly. 💅

🌸 DESCRIPTION 🌸

so the whole tea is this: asynchronous events get reported to users through event channels. that's it, that's the sentence. that's the whole job. she's a channel and she carries events, periodt.

⭐ RETURN VALUE ⭐

• on a good day she returns a pointer to the created event channel ✨
• on a bad day she returns NULL because the request failed 😭
• and if it fails, errno will be set to tell you why it failed — so like, always check, bestie, don't just rawdog a NULL pointer, that's not the move 💀

👑 NOTES 👑

okay this is the part where I need you to actually listen because it's giving important:

• event channels are used to direct all events on an rdma_cm_id.
• for many clients, a single event channel may be sufficient. one channel, one girl, she's handling it.
• however, when you're managing a large number of connections or cm_id's, users may find it useful to direct events for different cm_id's to different channels for processing. like, spread the load, delegate, be a manager. 🦋

also, big one: all created event channels must be destroyed by calling rdma_destroy_event_channel. you made her, you clean up after her. no leaving channels lying around, that's messy and the OS will side-eye you.

• users should call rdma_get_cm_event to retrieve events on an event channel. that's how you actually get the events out of the channel, obviously. 🙈
• and here's the fun bit: each event channel is mapped to a file descriptor. the associated file descriptor can be used and manipulated like any other fd to change its behavior. users may make the fd non-blocking, poll or select the fd, etc. so yeah she's an fd. she's just a little guy. treat her like one. 🔥

🌈 SEE ALSO 🌈

• rdma_cm(7)
• rdma_get_cm_event(3)
• rdma_destroy_event_channel(3)

and that's the whole page, bestie!! 💖✨🎀🦋🌸💅🫶

this was brought to you by the librdmacm girlies, dated 2007-05-15 — yeah she's been serving since 2007 and she still eats. 👑 no cap. 💜