pfm_strerror — return constant string describing error code
Synopsis
#include <perfmon/pfmlib.h> const char *pfm_strerror(int code);
Description
This function returns a string which describes the libpfm error value in code. The string returned by the call is read-only.
The function must only be used with libpfm calls documented to return specific error codes. The value -1 is not considered a specific error code. Strings and pfm_pmu_t return values cannot be used with this function. Typically NULL is returned in case of error for string values, and PFM_PMU_NONE is returned for pfm_pmu_t values.
The function is also not designed to handle OS system call errors, i.e., errno values.
Return
The function returns a pointer to the constant string describing the error code. The string is in English. If code is invalid then a default error message is returned.
Errors
If the error code is invalid, then the function returns a pointer to a string which says "unknown error code".