mmv_lookup_value_desc(3) — Linux manual page

NAME | C SYNOPSIS | DESCRIPTION | RETURNS | SEE ALSO | COLOPHON

MMV_LOOK...ALUE_DESC(3) Library Functions Manual MMV_LOOK...ALUE_DESC(3)

NAME         top

       mmv_lookup_value_desc - find a value in the Memory Mapped Value
       file

C SYNOPSIS         top

       #include <pcp/pmapi.h>
       #include <pcp/mmv_stats.h>

       pmAtomValue *mmv_lookup_value_desc(void *addr, const char
               *metric, const char *inst);

       cc ... -lpcp_mmv -lpcp

DESCRIPTION         top

       mmv_lookup_value_desc  searches  for  the  value  of the instance
       identified by the external instance name inst of the metric  met‐
       ric  in  the  MMV(5)  file.   addr  is  the address returned from
       mmv_stats_init().

       The pointer returned points to a pmAtomValue union, which is  de‐
       fined as follows:

           typedef union {
               __int32_t   l;      /* 32-bit signed */
               __uint32_t  ul;     /* 32-bit unsigned */
               __int64_t   ll;     /* 64-bit signed */
               __uint64_t  ull;    /* 64-bit unsigned */
               float       f;      /* 32-bit floating point */
               double      d;      /* 64-bit floating point */
               char         *cp;   /* char ptr */
            pmValueBlock *vbp;  /* pmValueBlock ptr */
           } pmAtomValue;

       MMV   string   values   should   be   set  using  either  of  the
       mmv_set_string or mmv_set_strlen routines.

RETURNS         top

       The function returns the address inside of the memory mapped  re‐
       gion on success or NULL on failure.

SEE ALSO         top

       mmv_stats_init(3), mmv_inc_value(3) and mmv(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.  In‐
       formation about the project can be found at ⟨http://www.pcp.io/⟩.
       If  you  have  a  bug  report  for  this  manual page, send it to
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       upstream                      Git                      repository
       ⟨https://github.com/performancecopilot/pcp.git⟩  on   2024-06-14.
       (At  that time, the date of the most recent commit that was found
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       [email protected]

Performance Co-Pilot                             MMV_LOOK...ALUE_DESC(3)

Pages that refer to this page: mmv_inc_value(3)mmv_set_value(3)mmv_stats_init(3)mmv_stats_registry(3)