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#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <fcntl.h>
int g_count;
void Exit()
{
printf("I will exit, press any key to continue...(g_count = %d)\n", g_count);
exit(0);
}
int main(int argc, char* argv[])
{
struct sigaction almact;
pid_t pid;

// ´´½¨ÊØ»¤½ø³Ì£¬ÈóÌÐòÔÚºǫ́ÔËÐÐ
// fork£¬ÖÕÖ¹¸¸½ø³Ì
if (pid = fork())
exit(0);

// µÚÒ»×Ó½ø³Ì
setsid();
signal(SIGHUP, SIG_IGN);
// fork, ÖÕÖ¹µÚÒ»×Ó½ø³Ì
if (pid = fork())
exit(0);
// Çå³ýÎļþÑÚÂë
umask(0);
signal(SIGTERM, Exit); // killɱµô½ø³Ìʱºò³ÌÐòĬÈÏÖ´Ðк¯ÊýExit



while (1)
{
sleep(1);
g_count ++;
}
}