gcov_out.c源码如下：
[builder@ci-rhel6 ~]$ cat gcov_out.c

include <stdio.h>

include <stdlib.h>

include <signal.h>

define SIMPLE_WAY

void sighandler(int signo)
{

ifdef SIMPLE_WAY

exit(signo);

else

extern void __gcov_flush();
// flush out gcov stats data
__gcov_flush();
// raise the signal again to crash process
raise(signo);

endif

}
attribute ((constructor))
void ctor()
{
int sigs[] = {
SIGILL, SIGFPE, SIGABRT, SIGBUS,
SIGSEGV, SIGHUP, SIGINT, SIGQUIT,
SIGTERM
};
int i;
struct sigaction sa;
sa.sa_handler = sighandler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESETHAND;
for(i = 0; i < sizeof(sigs)/sizeof(sigs[0]); ++i) {
if (sigaction(sigs[i], &sa, NULL) == -1) {
perror("Could not set signal handler");
}
}
}