Created
February 17, 2020 04:48
-
-
Save grantseltzer/f82d5e2471e563f6aaf800ad9cdcf8a1 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
import ( | |
"fmt" | |
"log" | |
"os" | |
"os/signal" | |
"github.com/iovisor/gobpf/bcc" | |
) | |
const eBPF_Program = ` | |
#include <uapi/linux/ptrace.h> | |
#include <linux/string.h> | |
BPF_PERF_OUTPUT(events); | |
inline int function_was_called(struct pt_regs *ctx) { | |
char x[29] = "Hey, the handler was called!"; | |
events.perf_submit(ctx, &x, sizeof(x)); | |
return 0; | |
} | |
` | |
func main() { | |
bpfModule := bcc.NewModule(eBPF_Program, []string{}) | |
uprobeFd, err := bpfModule.LoadUprobe("function_was_called") | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = bpfModule.AttachUprobe(os.Args[1], "main.handlerFunction", uprobeFd, -1) | |
if err != nil { | |
log.Fatal(err) | |
} | |
table := bcc.NewTable(bpfModule.TableId("events"), bpfModule) | |
channel := make(chan []byte) | |
perfMap, err := bcc.InitPerfMap(table, channel) | |
if err != nil { | |
log.Fatal(err) | |
} | |
c := make(chan os.Signal, 1) | |
signal.Notify(c, os.Interrupt) | |
go func() { | |
for { | |
value := <-channel | |
fmt.Println(string(value)) | |
} | |
}() | |
perfMap.Start() | |
<-c | |
perfMap.Stop() | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment