function::registers_valid.3stap man page
function::registers_valid ā Determines validity of register and u_register in current context None This function returns 1 if register and u_register can be used in the current context, or 0 otherwise. For example, registers_valid returns 0 when called from a begin or end probe. tapset::context(3stap)Synopsis
registers_valid:long()
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November 2019 SystemTap Tapset Reference Context Functions