有关Linux 下多进程与信号的问题，求助大神！之前发的贴子，一直没有解决.
输入ctrl + c ，程序打印了一部分没有执行， 设p2 = 0 while 循环没有退出运行环境 ubantu 编译器 g++
#include <unistd.h>
#include <iostream>
#include <string>
#include <signal.h>
#include <sys/wait.h>
#include <sys/types.h>
using namespace std;
pid_t childPid_1;
pid_t childPid_2;
int i = 1;
bool j = true;
/*处理信号函数*/
void cap(int signum);
void process_cap1 (int signum);
void process_cap2 (int signum);
int main(int argc,char *arg[])
{
int pfd;
char buf;
string send1 = "I send you ";
string send2 = " time";
string send;
/*创建匿名管道*/
if(pipe(pfd) == -1){
cout << "创建失败" << endl;
} else {
cout << "创建管道成功" << endl;
}
childPid_1 = fork ();
if (childPid_1 < 0){
cout << "创建失败" << endl;
} else {
if (childPid_1 == 0){
//忽略SIGINT
signal (SIGINT,SIG_IGN);
cout << "创建子进程——1成功" ;
childPid_1 = getpid ();
cout << "ppid"
<< getppid()
<< "pid"
<< getpid()
<< endl;
while (i){
/*执行子进程-1操作**/
send = send1+to_string(i);
send += send2;
const char* s = send.c_str();
i++;
write(pfd,s,1024);
/* 每发送一次 休眠一秒*/
sleep(1);
//捕捉父进程的信号，退出循环
if (signal(SIGUSR1,process_cap1) == SIG_ERR){
cout << "error";
}
}
cout << "Child Process 1 is killed by Parent" <<
endl;
exit(0);
} else {
//sleep(5);
/*执行父进程创建子进程-2操作*/
childPid_2 = fork();
if (childPid_2 < 0){
cout <<"创建失败" << endl;
} else if (childPid_2 == 0){
//忽略SIGINT
signal (SIGINT,SIG_IGN);
cout << "创建子进程——2成功" ;
childPid_2 = getpid();
cout << "ppid"
<< getppid()
<< "pid"
<< getpid()
<< endl;
/*执行子进程-2操作**/
while (j){
read(pfd,buf,1024);
cout << buf << endl;
//捕捉父进程信号
if (signal (SIGUSR2,process_cap2) == SIG_ERR){
cout << "error";
}
if (j == false){
break;
}
}
cout << "Child Process 2 is killed by Parent!" <<endl;
exit (0);
} else {
/*执行来自用户的操作 ctrl+c */
signal (SIGINT,cap);
while (true);
}
}
}
}
void cap (int signum)
{
cout << getpid()
<< "进程"
<< "捕捉到SIGINT信号"
<< endl;
kill (childPid_1,SIGUSR1);
waitpid (childPid_1,NULL,0);
kill (childPid_2,SIGUSR2);
waitpid (childPid_2,NULL,0);
cout << "Parent Process is killed";
signal(SIGINT,SIG_DFL);
}
void process_cap1 (int signum){
cout << getpid()
<< "进程"
<< "捕捉到SIGUSR1信号"
<< endl;
//将 i 设置为负数 退出while
i = -1;
}
void process_cap2 (int signum){
cout << j;
j = false;
cout << getpid()
<< "进程"
<< "捕捉到SIGUSR2信号"
<< endl;
cout << j;
return ;
}
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