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tracepoint.go
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tracepoint.go
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package manager
import (
"fmt"
"strings"
)
// attachTracepoint - Attaches the probe to its tracepoint
func (p *Probe) attachTracepoint() error {
// Parse section
if len(p.TracepointCategory) == 0 || len(p.TracepointName) == 0 {
traceGroup := strings.SplitN(p.programSpec.SectionName, "/", 3)
if len(traceGroup) != 3 {
return fmt.Errorf("expected SEC(\"tracepoint/[category]/[name]\") got %s: %w", p.programSpec.SectionName, ErrSectionFormat)
}
p.TracepointCategory = traceGroup[1]
p.TracepointName = traceGroup[2]
}
// Get the ID of the tracepoint to activate
tracepointID, err := GetTracepointID(p.TracepointCategory, p.TracepointName)
if err != nil {
return fmt.Errorf("couldn't activate tracepoint %s: %w", p.ProbeIdentificationPair, err)
}
// Hook the eBPF program to the tracepoint
p.perfEventFD, err = perfEventOpenTracingEvent(tracepointID, -1)
if err != nil {
return fmt.Errorf("couldn't enable tracepoint %s: %w", p.ProbeIdentificationPair, err)
}
if err = ioctlPerfEventSetBPF(p.perfEventFD, p.program.FD()); err != nil {
return fmt.Errorf("couldn't set perf event bpf %s: %w", p.ProbeIdentificationPair, err)
}
if err = ioctlPerfEventEnable(p.perfEventFD); err != nil {
return fmt.Errorf("couldn't enable perf event %s: %w", p.ProbeIdentificationPair, err)
}
return nil
}
func (p *Probe) pauseTracepoint() error {
if err := ioctlPerfEventDisable(p.perfEventFD); err != nil {
return fmt.Errorf("pause tracepoint: %w", err)
}
return nil
}
func (p *Probe) resumeTracepoint() error {
if err := ioctlPerfEventEnable(p.perfEventFD); err != nil {
return fmt.Errorf("resume tracepoint: %w", err)
}
return nil
}