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| #include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
pid_t id1=0;
pid_t id2=0;
void shutDown(int sig)
{
kill(id1,sig);
kill(id2,sig);
int status;
waitpid(id1, &status, WUNTRACED | WCONTINUED);
waitpid(id2, &status, WUNTRACED | WCONTINUED);
printf("Parent process is killed\n");
_exit(0);
}
void closed1(int sig)
{
printf("child process is killed by parent\n");
_exit(0);
}
void closed2(int sig)
{
printf("child process2 is killed by parent\n");
_exit(0);
}
int main()
{
int fd=open("mypfifo",O_CREAT|O_WRONLY,0666);
pid_t id2=fork();
if(id2>0)
{
pid_t id1=fork();
if(id1>0)
{
signal(SIGINT,shutDown);
while(true)
{
if(lockf(1,F_LOCK,0)==-1)
{
printf("加锁失败\n");
}
printf("我是主进程\n");
sleep(1);
if(lockf(1,F_ULOCK,0)==-1)
{
printf("解锁失败\n");
}
}
}
else
{
fd=open("mypfifo",O_WRONLY,0666);
signal(SIGINT,closed2);
while(true)
{
lockf(1,F_LOCK,0);
printf("我是2号子进程\n");
sleep(1);
lockf(1,F_ULOCK,0);
}
}
}
else
{
fd=open("mypfifo",O_WRONLY,0666);
signal(SIGINT,closed1);
while(true)
{
lockf(1,F_LOCK,0);
printf("我是1号子进程\n");
sleep(1);
lockf(1,F_ULOCK,0);
}
}
}
|
Unreal Engine 5 事件，函数与宏浅析
Banker-Algorithm