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...include | |
#define BUF_SIZE 256 | |
int main(int argc, char *argv[]) | |
{ | |
int sfd, rfd, portno, clilen; | |
char buffer[BUF_SIZE]; | |
struct sockaddr_in serv_addr, cli_addr; | |
int n; | |
int flags = 1; | |
if (argc < 2) { perror("ERROR: no port\n"); exit(0); } | |
sfd = socket(AF_INET, SOCK_STREAM, 0); | |
if (sfd < 0) { perror("ERROR: socket()"); exit(0); } | |
flags = 10; | |
if (setsockopt(sfd, SOL_TCP, TCP_KEEPIDLE, (void *)&flags, sizeof(flags))) { perror("ERROR: setsocketopt(), SO_KEEPIDLE"); exit(0); }; | |
flags = 5; | |
if (setsockopt(sfd, SOL_TCP, TCP_KEEPCNT, (void *)&flags, sizeof(flags))) { perror("ERROR: setsocketopt(), SO_KEEPCNT"); exit(0); }; | |
flags = 5; | |
if (setsockopt(sfd, SOL_TCP, TCP_KEEPINTVL, (void *)&flags, sizeof(flags))) { perror("ERROR: setsocketopt(), SO_KEEPINTVL"); exit(0); }; | |
bzero((char *) &serv_addr, sizeof(serv_addr)); | |
portno = atoi(argv[1]); | |
serv_addr.sin_family = AF_INET; | |
serv_addr.sin_addr.s_addr = INADDR_ANY; | |
serv_addr.sin_port = htons(portno); | |
if (bind(sfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) { perror("ERROR: bind()"); exit(0); } | |
listen(sfd, 5); | |
while (1) { | |
clilen = sizeof(cli_addr); | |
rfd = accept(sfd, (struct sockaddr *) &cli_addr, &clilen); | |
if (rfd < 0) { perror("ERROR: accept()"); exit(0); } | |
while (1) { | |
flags =1; | |
if (setsockopt(rfd, SOL_SOCKET, SO_KEEPALIVE, (void *)&flags, sizeof(flags))) { perror("ERROR: setsocketopt(), SO_KEEPALIVE"); exit(0); }; | |
n = read(rfd, buffer, BUF_SIZE); | |
if (n <= 0) { printf("read() ends\n"); break; } | |
printf("received: %s %d\n", buffer, n); | |
snprintf(buffer, BUF_SIZE, "got it"); | |
n = write(rfd, buffer, BUF_SIZE); | |
if (n < 0) { perror("ERROR: write()"); exit(0); } | |
} | |
} | |
return 0; | |
} | |
70,0-1 Bo |
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