1：编写链表，链表里面随便搞点数据 使用 fprintf 将链表中所有的数据，保存到文件中 使用 fscanf 读取文件中的数据，写入链表中，实现，当按 ctrl + c的时候，保存链表
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
typedef struct link_list
{int data;struct link_list *next;
}lis,*linkp;linkp p = NULL;void insert(int data)
{linkp new = (linkp)malloc(sizeof(lis));if(new==NULL){perror("NULL");return;}new->data=data;new->next = p;p = new;
}
void reads() { FILE* rfp = fopen("data.txt", "r"); if (rfp == NULL) { perror("reading"); return; } int a; while (fscanf(rfp, "%d", &a) != EOF) { insert(a); } fclose(rfp); printf("链表已根据data.txt文件更新\n");
} void savefun() { FILE *file = fopen("save.txt", "w"); if (file == NULL) { perror("writing"); return; } linkp q = p; while (q) { fprintf(file, "%d\n", q->data); q = q->next; } fclose(file); printf("链表已保存到save.txt文件中\n");
} void handler(int signo) { if (signo == SIGINT) { printf("按下ctrl+c后链表结果,存在save.txt中\n"); savefun(); } exit(0);
} int main(int argc, const char *argv[]) { signal(SIGINT, handler); insert(12); insert(34); insert(56); insert(78); reads(); printf("头插法写入链表完成\n"); while (1) { //收到SIGINT信号} return 0;
}
2：编写2个.c文件，生成2个可执行文件 1.c 输入正方形的长和宽 或者 三角形的三边长 2.c 输出长方形或者三角形的面积 要求数据通信使用无名管道实现
in.c
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <wait.h>
int main(int argc, const char *argv[])
{float buf[3];int pipefd[2] = {0};pid_t pid;if(pipe(pipefd)==-1){perror("pipe");return 1;}char std[2];std[0]=pipefd[0];std[1]=pipefd[1];pid = fork();if(pid==-1){perror("fork");return 1;}if(pid==0){execlp("./area","2",&(std[0]),&(std[1]),NULL);perror("execlp");exit(0);}else{printf("输入正方形的长和宽 或者 三角形三边 \n");printf("tips:如果是正方形第三个数输入0\n");scanf("%f %f %f",&buf[0],&buf[1],&buf[2]);write(pipefd[1],buf,sizeof(buf));wait(NULL);close(pipefd[0]);close(pipefd[1]);}return 0;
}
area.c
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <math.h>
int main(int argc, const char *argv[])
{float a,b,c;double area;int rp=*(argv[1]);int wp=*(argv[2]);if (read(rp,&a,sizeof(a)) == -1) {perror("read a");return 1;}if (read(rp,&b,sizeof(b)) == -1) {perror("read b");return 1;}if(read(rp,&c,sizeof(c)) == -1){perror("read c");return 1;}if (c==0){if(a==b){// 正方形的面积area = a * b;printf("正方形的面积为：%.2f\n", area);}else{printf("输入长方形\n");}}else {// 三角形的面积（海伦公式）double p = (a + b + c) / 2.0;area = sqrt(p * (p - a) * (p - b) * (p - c));printf("三角形的面积为：%.2f\n", area);} return 0;
}
3：使用有名管道，实现2个终端之间的互相聊天功能 要求：能够并发
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
int main(int argc, const char *argv[])
{if(mkfifo("./myfifo1", 0664) == -1){perror("mkfifo1 error");return -1;}if(mkfifo("./myfifo2", 0664) == -1){perror("mkfifo2 error");return -1;}getchar();system("rm myfifo1");system("rm myfifo2");return 0;
}#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>int main(int argc, char const *argv[])
{pid_t pid=fork();if(pid>0){int wfd = -1;if((wfd = open("./myfifo1", O_WRONLY)) == -1){perror("open error");return -1;}char wbuf[128] = "";while(1){printf("这里是1号机,请输入>>>");fgets(wbuf, sizeof(wbuf), stdin);wbuf[strlen(wbuf)-1] = 0;write(wfd, wbuf, strlen(wbuf));if(strcmp(wbuf,"quit") == 0)break;}close(wfd); }else if(pid==0){int rfd = -1;if((rfd = open("./myfifo2", O_RDONLY)) == -1){perror("open error");return -1;}char rbuf[128] = "";while(1){bzero(rbuf, sizeof(rbuf));read(rfd, rbuf, sizeof(rbuf));printf("\t\t\t\t\t1号机收到的数据为：%s\n", rbuf);if(strcmp(rbuf,"quit") == 0)break;}close(rfd);exit(EXIT_SUCCESS);}elseperror("fork"); return 0;
}
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
int main(int argc, char const *argv[])
{pid_t pid=fork();if(pid>0){int rfd = -1;if((rfd = open("./myfifo1", O_RDONLY)) == -1){perror("open error");return -1;}char rbuf[128] = "";while(1){bzero(rbuf, sizeof(rbuf));read(rfd, rbuf, sizeof(rbuf));printf("\t\t\t\t\t2号机收到的数据为：%s\n", rbuf);if(strcmp(rbuf,"quit") == 0)break;}close(rfd); }else if(pid==0){int wfd = -1;if((wfd = open("./myfifo2", O_WRONLY)) == -1){perror("open error");return -1;}char wbuf[128] = "";while(1){printf("这里是2号机,请输入>>>");fgets(wbuf, sizeof(wbuf), stdin);wbuf[strlen(wbuf)-1] = 0;write(wfd, wbuf, strlen(wbuf));if(strcmp(wbuf,"quit") == 0)break;}close(wfd); exit(EXIT_SUCCESS);}elseperror("fock"); return 0;
}
)
