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 in‐
       st 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).

Performance Co-Pilot                                                                    MMV_LOOKUP_VALUE_DESC(3)