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#include <myhead.h>int main(int argc, const char *argv[])
{int pipefd[2];char buff[1024] = "hello world";char s[1024];if(pipe(pipefd)==-1){perror("pipe");return -1;}//读端pipefd[0] 写端pipefd[1]pid_t pid = fork();//创建子进程if(pid==0){close(pipefd[1]);//先关闭写端while(1){sleep(1);read(pipefd[0],s,sizeof(s));printf("儿子在读取：%s\n",s);//输出读取的数据}close(pipefd[0]);//关闭读端}else if(pid>0){close(pipefd[0]);//先关闭读端while(1){sleep(1);write(pipefd[1],buff,sizeof(buff));}close(pipefd[1]);//完成后关闭写端}else{perror("fork");return -1;}return 0;
}

写端：

#include <myhead.h>int main(int argc, const char *argv[])
{int k = mkfifo("./myfifo",0664);//创建有名管道if(k==-1){perror("mkfifo");return -1;}int fd1 = open("./myfifo",O_WRONLY);//打开管道if(fd1==-1){perror("open");return -1;}char buff[1024];while(1)//循环写入数据{printf("请输入内容：");int res = read(0,buff,sizeof(buff));//输入从0号描述符读取数据write(fd1,buff,res);//写入有名管道}close(fd1);//关闭有名管道return 0;
}

读端：

#include <myhead.h>int main(int argc, const char *argv[])
{int fd2 = open("./myfifo",O_RDONLY);//打开管道文件if(fd2==-1){perror("open");return -1;}char buff[1024];while(1)//循环读取数据{int res = read(fd2,buff,sizeof(buff));if(res==0){printf("写入端退出\n");break;}write(1,buff,res);//写入标准输出描述符}close(fd2);//关闭管道文件    return 0;
}

练习：

#include <myhead.h>int main(int argc, const char *argv[])
{int fd1 = open("./myfo1",O_WRONLY);int fd2 = open("./myfo2",O_RDONLY);if(fd1==-1||fd2==-1){perror("open");return -1;}char buff[1024];pid_t pid = fork();if(pid>0)//父进程写入管道1{while(1){printf("请输入内容：\n");int res = read(0,buff,sizeof(buff));write(fd1,buff,res);//写入管道1}}else if(pid==0)//子进程读取管道2{while(1){int res = read(fd2,buff,sizeof(buff));write(1,buff,res);//读取内容显示出来}}else{perror("fork");return -1;}return 0;
}

#include <myhead.h>int main(int argc, const char *argv[])
{int fd1 = open("./myfo1",O_RDONLY);int fd2 = open("./myfo2",O_WRONLY);if(fd1==-1||fd2==-1){perror("open");return -1;}char buff[1024];pid_t pid = fork();if(pid>0)//父进程写入管道2{while(1){printf("请输入内容：\n");int res = read(0,buff,sizeof(buff));write(fd2,buff,res);//写入管道1}}else if(pid==0)//子进程读取管道1{while(1){int res = read(fd1,buff,sizeof(buff));write(1,buff,res);//读取内容显示出来}}else{perror("fork");return -1;}return 0;
}

#include <myhead.h>void hander(int tmy)
{if(tmy==SIGINT){printf("捕获了ctrl+c\n");}
}
int main(int argc, const char *argv[])
{
#if 0if(signal(SIGINT,SIG_IGN)==SIG_ERR)//忽略ctrl +c信号{perror("signal");return -1;}if(signal(SIGINT,SIG_DFL)==SIG_ERR)//默认ctrl +c信号{perror("signal");return -1;}
#endifif(signal(SIGINT,hander)==SIG_ERR)//hander将会捕获SIGINT信号作为自己的参数{perror("signal");return -1;}int k = 0;while(1){sleep(1);printf("唐明宇打呼噜k = %d\n",k);k++;}return 0;
}

#include<myhead.h>
void hander(int tmy)
{if(tmy==SIGCHLD){printf("捕获了(17)\n");}
}
int main(int argc, const char *argv[])
{pid_t pid;pid=fork();if(pid>0){if(signal(SIGCHLD,hander)==SIG_ERR){perror("signal");return -1;}}else if(pid==0){sleep(1);exit(0);//成功退出子进程}else{perror("fork");return -1;}wait(NULL);//阻塞回收子进程资源return 0;
}

#include <myhead.h>
void fun(int tmy)
{sleep(1);if(SIGSEGV==tmy){printf("内核发送了段错误信号\n");}
}
int main(int argc, const char *argv[])
{if(signal(SIGSEGV,fun)==SIG_ERR)//绑定信号{perror("signal");return -1;}int *p = NULL;*p = *p+1;while(1);return 0;
}

#include<myhead.h>
void fun(int wly)
{sleep(1);if(SIGTSTP==wly){printf("捕获到ctrl+z\n");}
}
int main(int argc, const char *argv[])
{if(signal(SIGTSTP,fun)==SIG_ERR){perror("signal");return -1;}while(1){sleep(1);printf("wly卷麻了\n");}return 0;
}