MPI_T_CVAR_READ(3)

💖 MPI_T_CVAR_READ(3) 💖

okay bestie so this is a page out of the Open MPI manual, section 3, and it's all about peeking at the value of a control variable. yes the real one. the Open MPI one. we're doing this. 🫶

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✨ NAME ✨

MPI_T_cvar_read — read the value of a control variable 📖

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✨ SYNTAX ✨

C Syntax

#include <mpi.h>

int MPI_T_cvar_read(MPI_T_cvar_handle handle, const void *buf)

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✨ INPUT PARAMETERS ✨

• handle — the handle of the control variable you wanna read, bestie. this is your little ticket to the thing. 🎟️
• buf — the initial address of the storage location where the variable value is gonna live. yes it's your buffer. your lil home for the data. 🏠

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✨ DESCRIPTION ✨

so like, MPI_T_cvar_read reads the value of the control variable that's identified by the handle you passed in as handle (iconic parameter naming, no notes) and stores that value in the buffer pointed to by buf. 💫

⚠️ real talk though: the caller MUST ensure that the buffer pointed to by buf is large enough to hold the entire value of the control variable. nobody is checking for you. that's on you. size it right or it's giving chaos. 😭

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✨ ERRORS ✨

MPI_T_cvar_read will fail if:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface not initialized. like girl it's not even awake yet. 💀
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid. that ticket? fake. 🚫

See also:

• MPI_T_cvar_handle_alloc <#mpi-t-cvar-handle-alloc>
• MPI_T_cvar_get_info <#mpi-t-cvar-get-info>

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✨ COPYRIGHT ✨

2003-2026, The Open MPI Community 👑

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and that's a wrap, bestie!! slay 💅 this was the Open MPI manual page for MPI_T_CVAR_READ(3), dated Sep 10, 2026. go read your control variables responsibly. periodt. 🎀🦋🌸