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.\" Man page generated from reStructuredText.
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.TH "MPI_T_CATEGORY_GET_INFO" "3" "May 30, 2025" "" "Open MPI"
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.sp
\fI\%MPI_T_category_get_info\fP — Query information from a category
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>
int MPI_T_category_get_info(int cat_index, char *name, int *name_len,
char *desc, int *desc_len, int *num_cvars, int *num_pvars,
int *num_categories)
.ft P
.fi
.UNINDENT
.UNINDENT
.SH INPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBcat_index\fP: Index of the category to be queried.
.UNINDENT
.SH INPUT/OUTPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBname_len\fP: Length of the string and/or buffer for name.
.IP \(bu 2
\fBdesc_len\fP: Length of the string and/or buffer for desc.
.UNINDENT
.SH OUTPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBname\fP: Buffer to return the string containing the name of the category.
.IP \(bu 2
\fBdesc\fP: Buffer to return the string containing the description of the category.
.IP \(bu 2
\fBnum_cvars\fP: Number of control variables in the category.
.IP \(bu 2
\fBnum_pvars\fP: Number of performance variables in the category.
.IP \(bu 2
\fBnum_categories\fP: Number of categories contained in the category.
.UNINDENT
.SH DESCRIPTION
.sp
\fI\%MPI_T_category_get_info\fP can be used to query information from a
category. The function returns the number of control variables,
performance variables, and sub\-categories in the queried category in the
arguments \fInum_cvars\fP, \fInum_pvars\fP, and \fInum_categories\fP, respectively.
.SH NOTES
.sp
This MPI tool interface function returns two strings. This function
takes two argument for each string: a buffer to store the string, and a
length which must initially specify the size of the buffer. If the
length passed is n then this function will copy at most n \- 1 characters
of the string into the corresponding buffer and set the length to the
number of characters copied \- 1. If the length argument is NULL or the
value specified in the length is 0 the corresponding string buffer is
ignored and the string is not returned.
.SH ERRORS
.sp
\fI\%MPI_T_category_get_info\fP will fail if:
.INDENT 0.0
.IP \(bu 2
\fBMPI_T_ERR_NOT_INITIALIZED\fP: The MPI Tools interface not initialized
.IP \(bu 2
\fBMPI_T_ERR_INVALID_INDEX\fP: The category index is invalid
.UNINDENT
.SH COPYRIGHT
2003-2025, The Open MPI Community
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