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dbc897ff7a3ac4156432dfdfe75e03c0fbd501d2
simple-kanban/server.c
源文雨 dbc897ff7a fix: string compare issue
2023-03-16 00:52:06 +08:00

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#include <arpa/inet.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <simple_protobuf.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include "config.h"
#if !__APPLE__
#include <sys/sendfile.h>
#include <endian.h>
#ifndef FD_COPY
#define FD_COPY(f, t) bcopy(f, t, sizeof(*(f)))
#endif
#else
#include <machine/endian.h>
#endif
static uint8_t _cfg[sizeof(SIMPLE_PB)+sizeof(config_t)];
#define cfg ((const const_config_t*)(_cfg+sizeof(SIMPLE_PB))) // 存储 pwd 和 sps
static int fd; // server socket fd
#ifdef LISTEN_ON_IPV6
static socklen_t struct_len = sizeof(struct sockaddr_in6);
static struct sockaddr_in6 server_addr;
static struct sockaddr_in6 client_addr;
#else
static socklen_t struct_len = sizeof(struct sockaddr_in);
static struct sockaddr_in server_addr;
static struct sockaddr_in client_addr;
#endif
static char *data_path; // cat 命令读取的文件位置
static char *kanban_path; // get 命令读取的文件位置
/* lock operations for open_file */
#define LOCK_ALLF_UN 0x00 /* unlock all file */
#define LOCK_DATA_SH 0x01 /* shared data file lock */
#define LOCK_DATA_EX 0x02 /* exclusive data file lock */
#define LOCK_KANB_SH 0x04 /* shared kanban file lock */
#define LOCK_KANB_EX 0x08 /* exclusive kanban file lock */
static int file_mode = LOCK_ALLF_UN;
static int kanb_file_ro_cnt, data_file_ro_cnt;
// THREADCNT 并行的监听队列/select队列长度
#define THREADCNT 16
// MAXWAITSEC 最大等待时间
#define MAXWAITSEC 16
#define TIMERDATSZ (BUFSIZ-sizeof(int)-sizeof(time_t)-sizeof(int)-sizeof(ssize_t)-sizeof(int8_t)-sizeof(uint8_t)*3-sizeof(FILE*))
static struct timeval timeout;
// 会话的上下文
// 包含了本次 accept 的全部信息
struct threadtimer_t {
int index; // 自身位置
int accept_fd; // 本次 accept 的 fd
time_t touch; // 最后访问时间，与当前时间差超过 MAXWAITSEC 将强行中断连接
ssize_t numbytes; // 本次接收的数据长度
FILE *fp; // 本会话打开的文件
int8_t status; // 本会话所处的状态
uint8_t is_open; // 标识 fp 是否正在使用
uint8_t lock_type; // 打开文件类型
uint8_t again_cnt; // EAGAIN 次数
char data[TIMERDATSZ];
};
typedef struct threadtimer_t threadtimer_t;
static threadtimer_t timers[THREADCNT];
static fd_set rdfds, wrfds, erfds, tmpfds;
#define show_usage(program) printf("Usage: %s (-d) port kanban.txt data.bin config.sp\n\t-d: As daemon\n", program)
/*
* accept_client 接受新连接，
* 调用 select 处理
* 处理入口点为 handle_accept
* 当 client 超过 MAXWAITSEC 未响应时
* 调用 clean_timer 回收
* 未被释放的资源以防止内存泄漏等
*/
static void accept_client();
static int bind_server(int* port);
/*
* check_buffer 检查接收到的数据，结合
* 当前会话所处状态决定接下来的处理流程
*/
static int check_buffer(threadtimer_t *timer);
static void clean_timer(threadtimer_t* timer);
static void close_file(threadtimer_t *timer);
static int close_file_and_send(threadtimer_t *timer, char *data, size_t numbytes);
// handle_accept 初步解析指令，处理部分粘连
static int handle_accept(threadtimer_t* p);
static void handle_end(int signo);
static void handle_int(int signo);
static void handle_quit(int signo);
static void handle_segv(int signo);
static int listen_socket();
static FILE *open_file(char* file_path, int lock_type, char* mode);
static int send_all(char* file_path, threadtimer_t *timer);
static int send_data(int accept_fd, char *data, size_t length);
static off_t size_of_file(const char* fname);
static int sm1_pwd(threadtimer_t *timer);
static int s0_init(threadtimer_t *timer);
static int s1_get(threadtimer_t *timer);
static int s2_set(threadtimer_t *timer);
static int s3_set_data(threadtimer_t *timer);
static void accept_client() {
int i;
signal(SIGINT, handle_int);
signal(SIGQUIT, handle_quit);
signal(SIGKILL, handle_end);
signal(SIGSEGV, handle_segv);
signal(SIGPIPE, SIG_IGN);
signal(SIGTERM, handle_end);
FD_SET(fd, &tmpfds);
while(1) {
FD_COPY(&tmpfds, &rdfds);
FD_COPY(&tmpfds, &erfds);
puts("Selecting...");
timeout.tv_sec = MAXWAITSEC/4;
int r = select(THREADCNT+8, &rdfds, &wrfds, &erfds, &timeout);
if(r < 0) {
perror("select");
return;
}
if(r == 0) { // 超时
for(i = 0; i < THREADCNT; i++) {
if(timers[i].touch && timers[i].accept_fd) {
time_t waitsec = time(NULL) - timers[i].touch;
if(waitsec > MAXWAITSEC) {
printf("Close@%d, wait sec: %u, max: %u\n", i, (unsigned int)waitsec, MAXWAITSEC);
clean_timer(&timers[i]);
}
}
}
continue;
}
puts("\nSelected");
// 正常
if(FD_ISSET(fd, &rdfds)) { // 有新连接
int p = 0;
while(p < THREADCNT && timers[p].touch) p++;
if(p >= THREADCNT) {
puts("Max thread cnt exceeded");
int nfd = accept(fd, (struct sockaddr *)&client_addr, &struct_len);
if(nfd > 0) close(nfd);
goto HANDLE_CLIENTS;
}
threadtimer_t* timer = &timers[p];
timer->accept_fd = accept(fd, (struct sockaddr *)&client_addr, &struct_len);
if(timer->accept_fd <= 0) {
perror("accept");
goto HANDLE_CLIENTS;
}
#ifdef LISTEN_ON_IPV6
uint16_t port = ntohs(client_addr.sin6_port);
struct in6_addr in = client_addr.sin6_addr;
char str[INET6_ADDRSTRLEN]; // 46
inet_ntop(AF_INET6, &in, str, sizeof(str));
#else
uint16_t port = ntohs(client_addr.sin_port);
struct in_addr in = client_addr.sin_addr;
char str[INET_ADDRSTRLEN]; // 16
inet_ntop(AF_INET, &in, str, sizeof(str));
#endif
time_t t = time(NULL);
printf("> %sAccept client(%d) %s:%u at slot No.%d, ", ctime(&t), timer->accept_fd, str, port, p);
timer->index = p;
timer->touch = time(NULL);
timer->is_open = 0;
timer->fp = NULL;
timer->status = -1;
timer->again_cnt = 0;
if(send_data(timer->accept_fd, "Welcome to simple kanban server.", 33) <= 0) {
puts("Send banner to new client failed");
clean_timer(timer);
goto HANDLE_CLIENTS;
}
FD_SET(timer->accept_fd, &tmpfds);
puts("Add new client into select list");
} else if(FD_ISSET(fd, &erfds)) { // 主套接字错误
int nfd = accept(fd, (struct sockaddr *)&client_addr, &struct_len);
perror("main fd in erfds");
if(nfd > 0) close(nfd);
return;
}
HANDLE_CLIENTS:
for(i = 0; i < THREADCNT; i++) {
if(timers[i].touch && timers[i].accept_fd) {
if(FD_ISSET(timers[i].accept_fd, &rdfds)) {
if(!handle_accept(&timers[i])) clean_timer(&timers[i]);
else FD_SET(timers[i].accept_fd, &tmpfds);
} else if(FD_ISSET(timers[i].accept_fd, &erfds)) {
printf("Close@%d due to error\n", i);
clean_timer(&timers[i]);
}
}
}
}
}
static int bind_server(int* port) {
#ifdef LISTEN_ON_IPV6
server_addr.sin6_family = AF_INET6;
server_addr.sin6_port = htons((uint16_t)(*port));
bzero(&(server_addr.sin6_addr), sizeof(server_addr.sin6_addr));
int fd = socket(PF_INET6, SOCK_STREAM, 0);
#else
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons((uint16_t)(*port));
server_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(server_addr.sin_zero), 8);
int fd = socket(AF_INET, SOCK_STREAM, 0);
#endif
int on = 1;
if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) {
perror("Set socket option failure");
return 0;
}
if(!~bind(fd, (struct sockaddr *)&server_addr, struct_len)) {
perror("Bind server failure");
return 0;
}
#ifdef LISTEN_ON_IPV6
*port = ntohs(server_addr.sin6_port);
struct in6_addr in = server_addr.sin6_addr;
char str[INET6_ADDRSTRLEN]; // 46
inet_ntop(AF_INET6, &in, str, sizeof(str));
#else
*port = ntohs(server_addr.sin_port);
struct in_addr in = server_addr.sin_addr;
char str[INET_ADDRSTRLEN]; // 16
inet_ntop(AF_INET, &in, str, sizeof(str));
#endif
printf("Bind server successfully on %s:%u\n", str, *port);
return fd;
}
static int check_buffer(threadtimer_t *timer) {
printf("Status: %d\n", (int)timer->status);
switch(timer->status) {
case -1: return sm1_pwd(timer); break;
case 0: return s0_init(timer); break;
case 1: return s1_get(timer); break;
case 2: return s2_set(timer); break;
case 3: return s3_set_data(timer); break;
default: return -1; break;
}
}
static void clean_timer(threadtimer_t* timer) {
printf("Start cleaning: ");
if(timer->is_open) {
close_file(timer);
printf("Close file, ");
}
FD_CLR(timer->accept_fd, &tmpfds);
if(timer->accept_fd) {
close(timer->accept_fd);
timer->accept_fd = 0;
printf("Close accept, ");
}
timer->touch = 0;
timer->status = -1;
timer->lock_type = 0;
puts("Finish cleaning");
}
static void close_file(threadtimer_t *timer) {
if(timer->is_open && timer->fp != NULL) {
int lock_type = timer->lock_type;
puts("Close file");
fclose(timer->fp);
timer->is_open = 0;
timer->fp = NULL;
file_mode &= ~lock_type;
if((lock_type&LOCK_KANB_SH) > 0 && --kanb_file_ro_cnt > 0) {
file_mode |= LOCK_KANB_SH;
}
if((lock_type&LOCK_DATA_SH) > 0 && --data_file_ro_cnt > 0) {
file_mode |= LOCK_DATA_SH;
}
timer->lock_type = 0;
}
}
static int close_file_and_send(threadtimer_t *timer, char *data, size_t numbytes) {
close_file(timer);
return send_data(timer->accept_fd, data, numbytes);
}
#define take_word(p, w, buff) if((p)->numbytes >= strlen(w) && strncmp(buff, w, strlen(w)) == buff) {\
printf("<--- Taking: %s in %zd --->\n", w, (p)->numbytes);\
int l = strlen(w);\
char store = buff[l];\
buff[l] = 0;\
ssize_t n = (p)->numbytes - l;\
(p)->numbytes = l;\
if(!(r = check_buffer((p)))) {\
printf("<--- break in %zd --->\n", (p)->numbytes); \
break; \
} \
if(n > 0) { \
buff[0] = store; \
memmove(buff + 1, buff + l + 1, n - 1); \
} \
buff[n] = 0;\
(p)->numbytes = n;\
printf("<--- pass in %zd --->\n", (p)->numbytes); \
}
#define touch_timer(x) ((x)->touch = time(NULL))
#define my_fd(x) ((x)->accept_fd)
#define my_dat(x) ((x)->data)
static int handle_accept(threadtimer_t* p) {
int r = 1;
printf("Recv data from client@%d, ", p->index);
if((p)->status == 3) return s3_set_data(p);
while(((p)->numbytes = recv(my_fd(p), my_dat(p), TIMERDATSZ, MSG_DONTWAIT)) > 0) {
touch_timer(p);
my_dat(p)[(p)->numbytes] = 0;
printf("Get %d bytes: %s, Check buffer...\n", (int)(p)->numbytes, my_dat(p));
//处理允许的粘连
take_word(p, cfg->pwd, my_dat(p));
take_word(p, "get", my_dat(p));
take_word(p, "cat", my_dat(p));
take_word(p, "quit", my_dat(p));
take_word(p, cfg->sps, my_dat(p));
take_word(p, "ver", my_dat(p));
take_word(p, "dat", my_dat(p));
if((p)->numbytes <= 0) {
puts("Taking words finished");
break;
}
puts("Last check_buffer");
r = check_buffer((p));
break;
}
if((p)->numbytes <= 0) {
if(errno == EAGAIN || errno == EINVAL) {
if(!++(p)->again_cnt) {
r = 0;
puts("Max EAGAIN/EINVAL cnt exceeded");
}
} else if(errno) {
perror("recv");
r = 0;
}
}
printf("Recv finished, remain: %zd, continue: %s\n", (p)->numbytes, r?"true":"false");
return r;
}
static void handle_end(int signo) {
puts("Handle kill/term");
close(fd);
fflush(stdout);
exit(0);
}
static void handle_int(int signo) {
puts("Keyboard interrupted");
close(fd);
fflush(stdout);
exit(0);
}
static void handle_quit(int signo) {
puts("Handle sigquit");
close(fd);
fflush(stdout);
exit(0);
}
static void handle_segv(int signo) {
puts("Handle sigsegv");
close(fd);
fflush(stdout);
exit(0);
}
static int listen_socket() {
int flags = fcntl(fd, F_GETFL, 0);
if(!~listen(fd, THREADCNT)) return 1;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
static FILE *open_file(char* file_path, int lock_type, char* mode) {
FILE *fp = NULL;
if((lock_type&LOCK_KANB_SH)) {
if((file_mode&LOCK_KANB_EX) > 0) {
puts("open_file(KANB_SH): file is busy");
return NULL;
}
file_mode |= LOCK_KANB_SH;
kanb_file_ro_cnt++;
} else if((lock_type&LOCK_DATA_SH)) {
if((file_mode&LOCK_DATA_EX) > 0) {
puts("open_file(DATA_SH): file is busy");
return NULL;
}
file_mode |= LOCK_DATA_SH;
data_file_ro_cnt++;
} else if(lock_type&LOCK_KANB_EX) {
if((file_mode&(LOCK_KANB_EX|LOCK_KANB_SH)) > 0) {
puts("open_file(KANB_EX): file is busy");
return NULL;
}
file_mode |= LOCK_KANB_EX;
} else if(lock_type&LOCK_DATA_EX) {
if((file_mode&(LOCK_DATA_EX|LOCK_DATA_SH)) > 0) {
puts("open_file(DATA_EX): file is busy");
return NULL;
}
file_mode |= LOCK_DATA_EX;
}
fp = fopen(file_path, mode);
if(!fp) {
perror("fopen");
file_mode &= ~lock_type;
return NULL;
}
printf("Open file %s in mode %s\n", file_path, mode);
return fp;
}
static int send_all(char* file_path, threadtimer_t *timer) {
int re = 1;
FILE *fp = open_file(file_path, timer->lock_type, "rb");
if(fp) {
timer->fp = fp;
timer->is_open = 1;
uint32_t file_size = (uint32_t)size_of_file(file_path);
printf("Get file size: %d bytes, ", (int)file_size);
off_t len = 0;
int flags = fcntl(timer->accept_fd, F_GETFL, 0);
fcntl(timer->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
#if __APPLE__
#ifdef WORDS_BIGENDIAN
file_size = __DARWIN_OSSwapInt32(file_size);
#endif
struct sf_hdtr hdtr;
struct iovec headers;
headers.iov_base = &file_size;
headers.iov_len = sizeof(uint32_t);
hdtr.headers = &headers;
hdtr.hdr_cnt = 1;
hdtr.trailers = NULL;
hdtr.trl_cnt = 0;
re = !sendfile(fileno(fp), timer->accept_fd, 0, &len, &hdtr, 0);
if(!re) perror("sendfile");
#else
#ifdef WORDS_BIGENDIAN
uint32_t little_fs = __builtin_bswap32(file_size);
send(timer->accept_fd, &little_fs, sizeof(uint32_t), 0);
#else
send(timer->accept_fd, &file_size, sizeof(uint32_t), 0);
#endif
re = sendfile(timer->accept_fd, fileno(fp), &len, file_size) > 0;
if(!re) perror("sendfile");
#endif
printf("Send %d bytes\n", (int)len);
close_file(timer);
fcntl(timer->accept_fd, F_SETFL, flags);
}
return re;
}
static int send_data(int accept_fd, char *data, size_t length) {
char buf[128];
if(length == 0) {
puts("Send data error: zero length");
return 0;
}
if(!~send(accept_fd, data, length, MSG_DONTWAIT)) {
puts("Send data error");
return 0;
}
printf("Send data: ");
if(length >= 128) {
memcpy(buf, data, 124);
buf[124] = '.';
buf[125] = '.';
buf[126] = '.';
buf[127] = 0;
} else memcpy(buf, data, length);
if(buf[length]) buf[length] = 0;
puts(buf);
return 1;
}
static off_t size_of_file(const char* fname) {
struct stat statbuf;
if(stat(fname, &statbuf)==0) return statbuf.st_size;
else return -1;
}
static int sm1_pwd(threadtimer_t *timer) {
if(!strncmp(timer->data, cfg->pwd, strlen(cfg->pwd))) {
timer->status = 0;
puts("Password check passed");
} else puts("Password check failed");
return !timer->status;
}
static int s0_init(threadtimer_t *timer) {
if(!strncmp(timer->data, "get", 3)) timer->status = 1;
else if(!strncmp(timer->data, cfg->sps, strlen(cfg->sps))) timer->status = 2;
else if(!strncmp(timer->data, "cat", 3)) {
timer->lock_type = LOCK_DATA_SH;
return send_all(data_path, timer);
}
else if(!strncmp(timer->data, "quit", 4)) return 0;
return send_data(timer->accept_fd, timer->data, timer->numbytes);
}
static int s1_get(threadtimer_t *timer) { //get kanban
FILE *fp = open_file(kanban_path, LOCK_KANB_SH, "rb");
timer->status = 0;
if(fp) {
timer->fp = fp;
timer->is_open = 1;
timer->lock_type = LOCK_KANB_SH;
uint32_t ver, cli_ver;
if(fscanf(fp, "%u", &ver) > 0) {
if(sscanf(timer->data, "%u", &cli_ver) > 0) {
if(cli_ver < ver) { //need to send a new kanban
timer->is_open = 0;
close_file(timer);
int r = send_all(kanban_path, timer);
if(!strncmp(timer->data, "quit", 4)) {
puts("Found last cmd is quit");
return 0;
}
return r;
}
}
}
}
int r = close_file_and_send(timer, "null", 4);
if(!strncmp(timer->data, "quit", 4)) {
puts("Found last cmd is quit");
return 0;
}
return r;
}
static int s2_set(threadtimer_t *timer) {
FILE *fp = NULL;
int lktp;
if(!strncmp(timer->data, "ver", 3)) {
fp = open_file(kanban_path, LOCK_KANB_EX, "wb");
lktp = LOCK_KANB_EX;
} else if(!strncmp(timer->data, "dat", 3)) {
fp = open_file(data_path, LOCK_DATA_EX, "wb");
lktp = LOCK_DATA_EX;
}
if(fp) {
timer->status = 3;
timer->fp = fp;
timer->is_open = 1;
timer->lock_type = lktp;
return send_data(timer->accept_fd, "data", 4);
} else {
timer->status = 0;
return send_data(timer->accept_fd, "erro", 4);
}
}
static int s3_set_data(threadtimer_t *timer) {
char ret[4] = "succ";
int flags = fcntl(timer->accept_fd, F_GETFL, 0);
fcntl(timer->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
timer->status = 0;
ssize_t n = recv(timer->accept_fd, timer->data, 4, MSG_WAITALL);
if(n < 4) {
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
#ifdef WORDS_BIGENDIAN
uint32_t file_size = __builtin_bswap32(*(uint32_t*)(timer->data));
#else
uint32_t file_size = *(uint32_t*)(timer->data);
#endif
printf("Set data size: %u\n", file_size);
if((timer->numbytes = recv(timer->accept_fd, timer->data, TIMERDATSZ, 0)) < 0 && errno != EAGAIN) {
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
printf("Get data size: %d\n", (int)timer->numbytes);
if(file_size <= TIMERDATSZ) {
while(timer->numbytes != file_size) {
ssize_t n = recv(timer->accept_fd, timer->data + timer->numbytes, TIMERDATSZ - timer->numbytes, MSG_WAITALL);
if(n <= 0) {
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
timer->numbytes += n;
}
if(fwrite(timer->data, file_size, 1, timer->fp) != 1) {
perror("fwrite");
*(uint32_t*)ret = *(uint32_t*)"erro";
}
goto S3_RETURN;
}
if(timer->numbytes > 0 && fwrite(timer->data, timer->numbytes, 1, timer->fp) != 1) {
perror("fwrite");
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
int32_t remain = file_size - timer->numbytes;
while(remain > 0) {
// printf("remain:%d\n", (int)remain);
ssize_t n = recv(timer->accept_fd, timer->data, (remain>TIMERDATSZ)?TIMERDATSZ:remain, MSG_WAITALL);
if(n < 0) {
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
else if(!n) {
usleep(10000); // 10 ms
continue;
}
if(fwrite(timer->data, n, 1, timer->fp) != 1) {
perror("fwrite");
*(uint32_t*)ret = *(uint32_t*)"erro";
goto S3_RETURN;
}
remain -= n;
}
S3_RETURN:
fcntl(timer->accept_fd, F_SETFL, flags);
return close_file_and_send(timer, ret, 4);
}
int main(int argc, char *argv[]) {
if(argc != 5 && argc != 6) {
show_usage(argv[0]);
return 0;
}
int port = 0;
int as_daemon = !strncmp(argv[1], "-d", 3);
sscanf(argv[as_daemon?2:1], "%d", &port);
if(port < 0 || port >= 65536) {
printf("Error port: %d\n", port);
return 1;
}
if(as_daemon && daemon(1, 1) < 0) {
perror("Start daemon error");
return 2;
}
FILE *fp = NULL;
fp = fopen(argv[as_daemon?3:2], "rb+");
if(!fp) fp = fopen(argv[as_daemon?3:2], "wb+");
if(!fp) {
printf("Error opening kanban file: ");
perror(argv[as_daemon?3:2]);
return 3;
}
kanban_path = argv[as_daemon?3:2];
fclose(fp);
fp = NULL;
fp = fopen(argv[as_daemon?4:3], "rb+");
if(!fp) fp = fopen(argv[as_daemon?4:3], "wb+");
if(!fp) {
printf("Error opening data file: ");
perror(argv[as_daemon?4:3]);
return 4;
}
data_path = argv[as_daemon?4:3];
fclose(fp);
fp = NULL;
fp = fopen(argv[as_daemon?5:4], "rb");
if(!fp) {
printf("Error opening config file: ");
perror(argv[as_daemon?5:4]);
return 5;
}
read_pb_into(fp, (SIMPLE_PB*)(&_cfg));
fclose(fp);
if(!(fd = bind_server(&port))) {
return 6;
}
if(listen_socket()) {
perror("Listen failed");
return 7;
}
/*
printf("password: ");
puts(cfg->pwd);
printf("set password: ");
puts(cfg->sps);
*/
accept_client();
close(fd);
return 99;
}
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