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MMV_LOOK...ALUE_DESC(3) Library Functions Manual MMV_LOOK...ALUE_DESC(3)
mmv_lookup_value_desc - find a value in the Memory Mapped Value file
#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
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.
The function returns the address inside of the memory mapped region on success or NULL on failure.
mmv_stats_init(3), mmv_inc_value(3) and mmv(5).
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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)