NAME

       mmv_lookup_value_desc - find a value in the Memory Mapped Value file

C SYNOPSIS

       #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

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

       The pointer returned points to a pmAtomValue union, which is defined 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

       The function returns the address inside of the memory mapped region on success or NULL  on
       failure.

SEE ALSO

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