runtime: -buildmode=c-shared generated code hijack's signals from main program #11794
Description
It looks like a shared object created with -buildmode=c-shared "hijack's" signal handling away from the main program.
I'm experimenting with Go shared objects as plugins. The main process has signal handling implemented to do graceful shutdown. However, the main program does not receive signals anymore after a Go shared object was loaded.
I would expect the main program to receive (and handle) the signals. Instead, signals are completely ignored. It requires SIGKILL to kill the process.
Simple code to reproduce:
main.go:
package main
func init() {}
func main() {}_main.c:
#include <stdlib.h>
#include <stdio.h>
#include <dlfcn.h>
int main() {
void *plugin;
plugin = dlopen("./gopkg.so", RTLD_NOW);
if (!plugin) {
exit(1);
}
while(1) {
sleep(1);
}
return 0;
}run:
go build -buildmode c-shared -o gopkg.so
gcc -o main _main.c -ldl
./main
ctrl-c