电脑网站怎么做,网站备案ip地址段,wordpress如何修改语言,电子商务网站建设与管理论文我尝试了各种改编的或者官方的代码#xff0c;居然都是错的#xff0c;最终我发现了问题在于这一行代码
sub_process[pid] user_count;
就是这行代码把pid赋予数组#xff0c;但是这个数组有多大呢#xff0c;代码如下
sub_process new int[PROCESS_LIMIT ];
会发现代…我尝试了各种改编的或者官方的代码居然都是错的最终我发现了问题在于这一行代码
sub_process[pid] user_count;
就是这行代码把pid赋予数组但是这个数组有多大呢代码如下
sub_process new int[PROCESS_LIMIT ];
会发现代码最大才65536显然比pid号码要小所以*10就行了改为如下代码
sub_process new int[PROCESS_LIMIT * 10];我修改后官方代码清单13-4代码如下我测试过是可以运行的也不会报错了。
#include arpa/inet.h
#include assert.h
#include errno.h
#include fcntl.h
#include netinet/in.h
#include signal.h
#include stdio.h
#include stdlib.h
#include string.h
#include sys/epoll.h
#include sys/mman.h
#include sys/socket.h
#include sys/stat.h
#include sys/wait.h
#include unistd.h#define USER_LIMIT 5
#define BUFFER_SIZE 1024
#define FD_LIMIT 65535
#define MAX_EVENT_NUMBER 1024
#define PROCESS_LIMIT 65536struct client_data
{sockaddr_in address;int connfd;pid_t pid;int pipefd[2];
};static const char *shm_name /my_shm;
int sig_pipefd[2];
int epollfd;
int listenfd;
int shmfd;
char *share_mem 0;
client_data *users 0;
int *sub_process 0;
int user_count 0;
bool stop_child false;int setnonblocking(int fd)
{int old_option fcntl(fd, F_GETFL);int new_option old_option | O_NONBLOCK;fcntl(fd, F_SETFL, new_option);return old_option;
}void addfd(int epollfd, int fd)
{epoll_event event;event.data.fd fd;event.events EPOLLIN | EPOLLET;epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, event);setnonblocking(fd);
}void sig_handler(int sig)
{int save_errno errno;int msg sig;send(sig_pipefd[1], (char *) msg, 1, 0);errno save_errno;
}void addsig(int sig, void (*handler)(int), bool restart true)
{struct sigaction sa;memset(sa, \0, sizeof(sa));sa.sa_handler handler;if (restart){sa.sa_flags | SA_RESTART;}sigfillset(sa.sa_mask);assert(sigaction(sig, sa, NULL) ! -1);
}void del_resource()
{close(sig_pipefd[0]);close(sig_pipefd[1]);close(listenfd);close(epollfd);shm_unlink(shm_name);delete[] users;delete[] sub_process;
}void child_term_handler(int sig)
{stop_child true;
}int run_child(int idx, client_data *users, char *share_mem)
{epoll_event events[MAX_EVENT_NUMBER];int child_epollfd epoll_create(5);assert(child_epollfd ! -1);int connfd users[idx].connfd;addfd(child_epollfd, connfd);int pipefd users[idx].pipefd[1];addfd(child_epollfd, pipefd);int ret;addsig(SIGTERM, child_term_handler, false);while (!stop_child){int number epoll_wait(child_epollfd, events, MAX_EVENT_NUMBER, -1);if ((number 0) (errno ! EINTR)){printf(epoll failure\n);break;}for (int i 0; i number; i){int sockfd events[i].data.fd;if ((sockfd connfd) (events[i].events EPOLLIN)){memset(share_mem idx * BUFFER_SIZE, \0, BUFFER_SIZE);ret recv(connfd, share_mem idx * BUFFER_SIZE, BUFFER_SIZE - 1, 0);if (ret 0){if (errno ! EAGAIN){stop_child true;}}else if (ret 0){stop_child true;}else{send(pipefd, (char *) idx, sizeof(idx), 0);}}else if ((sockfd pipefd) (events[i].events EPOLLIN)){int client 0;ret recv(sockfd, (char *) client, sizeof(client), 0);if (ret 0){if (errno ! EAGAIN){stop_child true;}}else if (ret 0){stop_child true;}else{send(connfd, share_mem client * BUFFER_SIZE, BUFFER_SIZE, 0);}}else{continue;}}}close(connfd);close(pipefd);close(child_epollfd);return 0;
}int main(int argc, char *argv[])
{if (argc 2){printf(usage: %s ip_address port_number\n, basename(argv[0]));return 1;}const char *ip argv[1];int port atoi(argv[2]);int ret 0;struct sockaddr_in address;bzero(address, sizeof(address));address.sin_family AF_INET;inet_pton(AF_INET, ip, address.sin_addr);address.sin_port htons(port);listenfd socket(PF_INET, SOCK_STREAM, 0);assert(listenfd 0);ret bind(listenfd, (struct sockaddr *) address, sizeof(address));assert(ret ! -1);ret listen(listenfd, 5);assert(ret ! -1);user_count 0;users new client_data[USER_LIMIT 1];sub_process new int[PROCESS_LIMIT * 10];for (int i 0; i PROCESS_LIMIT; i){sub_process[i] -1;}epoll_event events[MAX_EVENT_NUMBER];epollfd epoll_create(5);assert(epollfd ! -1);addfd(epollfd, listenfd);ret socketpair(PF_UNIX, SOCK_STREAM, 0, sig_pipefd);assert(ret ! -1);setnonblocking(sig_pipefd[1]);addfd(epollfd, sig_pipefd[0]);addsig(SIGCHLD, sig_handler);addsig(SIGTERM, sig_handler);addsig(SIGINT, sig_handler);addsig(SIGPIPE, SIG_IGN);bool stop_server false;bool terminate false;shmfd shm_open(shm_name, O_CREAT | O_RDWR, 0666);assert(shmfd ! -1);ret ftruncate(shmfd, USER_LIMIT * BUFFER_SIZE);assert(ret ! -1);share_mem (char *) mmap(NULL, USER_LIMIT * BUFFER_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);assert(share_mem ! MAP_FAILED);close(shmfd);while (!stop_server){int number epoll_wait(epollfd, events, MAX_EVENT_NUMBER, -1);if ((number 0) (errno ! EINTR)){printf(epoll failure\n);break;}for (int i 0; i number; i){int sockfd events[i].data.fd;if (sockfd listenfd){struct sockaddr_in client_address;socklen_t client_addrlength sizeof(client_address);int connfd accept(listenfd, (struct sockaddr *) client_address, client_addrlength);if (connfd 0){printf(errno is: %d\n, errno);continue;}if (user_count USER_LIMIT){const char *info too many users\n;printf(%s, info);send(connfd, info, strlen(info), 0);close(connfd);continue;}users[user_count].address client_address;users[user_count].connfd connfd;ret socketpair(PF_UNIX, SOCK_STREAM, 0, users[user_count].pipefd);assert(ret ! -1);pid_t pid fork();if (pid 0){close(connfd);continue;}else if (pid 0){close(epollfd);close(listenfd);close(users[user_count].pipefd[0]);close(sig_pipefd[0]);close(sig_pipefd[1]);run_child(user_count, users, share_mem);munmap((void *) share_mem, USER_LIMIT * BUFFER_SIZE);exit(0);}else{close(connfd);close(users[user_count].pipefd[1]);addfd(epollfd, users[user_count].pipefd[0]);users[user_count].pid pid;sub_process[pid] user_count;user_count;}}else if ((sockfd sig_pipefd[0]) (events[i].events EPOLLIN)){int sig;char signals[1024];ret recv(sig_pipefd[0], signals, sizeof(signals), 0);if (ret -1){continue;}else if (ret 0){continue;}else{for (int i 0; i ret; i){switch (signals[i]){case SIGCHLD:{pid_t pid;int stat;while ((pid waitpid(-1, stat, WNOHANG)) 0){int del_user sub_process[pid];sub_process[pid] -1;if ((del_user 0) || (del_user USER_LIMIT)){printf(the deleted user was not change\n);continue;}epoll_ctl(epollfd, EPOLL_CTL_DEL, users[del_user].pipefd[0], 0);close(users[del_user].pipefd[0]);users[del_user] users[--user_count];sub_process[users[del_user].pid] del_user;printf(child %d exit, now we have %d users\n, del_user, user_count);}if (terminate user_count 0){stop_server true;}break;}case SIGTERM:case SIGINT:{printf(kill all the clild now\n);//addsig( SIGTERM, SIG_IGN );//addsig( SIGINT, SIG_IGN );if (user_count 0){stop_server true;break;}for (int i 0; i user_count; i){int pid users[i].pid;kill(pid, SIGTERM);}terminate true;break;}default:{break;}}}}}else if (events[i].events EPOLLIN){int child 0;ret recv(sockfd, (char *) child, sizeof(child), 0);printf(read data from child accross pipe\n);if (ret -1){continue;}else if (ret 0){continue;}else{for (int j 0; j user_count; j){if (users[j].pipefd[0] ! sockfd){printf(send data to child accross pipe\n);send(users[j].pipefd[0], (char *) child, sizeof(child), 0);}}}}}}del_resource();return 0;
}
