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package internal
import "C"
import (
"context"
"fmt"
"os"
"os/signal"
"runtime/pprof"
"syscall"
"ior/internal/flags"
"ior/internal/generated/tracepoints"
bpf "github.com/aquasecurity/libbpfgo"
)
func attachTracepoints(bpfModule *bpf.Module) error {
for _, name := range tracepoints.List {
prog, err := bpfModule.GetProgram(fmt.Sprintf("handle_%s", name))
if err != nil {
return fmt.Errorf("Failed to get BPF program handle_%s: %v", name, err)
}
fmt.Println("Attached prog handle_" + name)
if _, err = prog.AttachTracepoint("syscalls", name); err != nil {
// OK, older Kernel versions may not have this tracepoint!
fmt.Println(fmt.Errorf("Failed to attach to %s tracepoint: %v", name, err))
continue
}
fmt.Println("Attached tracepoint " + name)
}
return nil
}
func Run(flags flags.Flags) {
bpfModule, err := bpf.NewModuleFromFile("ior.bpf.o")
if err != nil {
panic(err)
}
defer bpfModule.Close()
if err := flags.ResizeBPFMaps(bpfModule); err != nil {
panic(err)
}
if err := flags.SetBPF(bpfModule); err != nil {
panic(err)
}
if err := bpfModule.BPFLoadObject(); err != nil {
panic(err)
}
if err := attachTracepoints(bpfModule); err != nil {
panic(err)
}
// 4096 channel size, minimises event drops
ch := make(chan []byte, 4096)
rb, err := bpfModule.InitRingBuf("event_map", ch)
if err != nil {
panic(err)
}
rb.Poll(300)
var cpuProfile, memProfile *os.File
if flags.PprofEnable {
if cpuProfile, err = os.Create("ior.cpuprofile"); err != nil {
panic(err)
}
if memProfile, err = os.Create("ior.memprofile"); err != nil {
panic(err)
}
pprof.StartCPUProfile(cpuProfile)
}
loop := newEventLoop(flags)
ctx, cancel := context.WithCancel(context.Background())
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
defer cancel()
<-c
fmt.Println(loop.stats())
if flags.PprofEnable {
fmt.Println("Stoppig profiling, writing ior.cpuprofile and ior.memprofile")
pprof.StopCPUProfile()
pprof.WriteHeapProfile(memProfile)
}
}()
loop.run(ctx, ch)
fmt.Println("Good bye... (unloading BPF tracepoints will take a few seconds...)")
}
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