Re: Problem with socket in gcc programming

[Pavel Tsekov <ptsekov at gmx dot net>]

Hello,

Works fine here. I'm running your testcase on:

$ uname -a
CYGWIN_NT-5.0 mordor 1.3.20(0.73/3/2) 2003-02-08 12:10 i686 unknown 
unknown Cygwin

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and the version of Cygwin that you are running. To learn how to do this
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reporting guidelines'. 

On Thu, 13 Feb 2003, Henry wrote:

> This is a demo program to issue my problem i'm facing to.
> #include <stdio.h>
> #include <sys/socket.h>
> #include <netinet/in.h>
> 
> int main(int argc, char *argv[]) {
> 	    int sockfd, accefd, rsinlen, on = 1;
> 	    pid_t pid;
> 	    struct sockaddr_in sin, rsin;
> 	    unsigned long waittime;
> 
> 	    if (fork()) exit(0);
>  
>  		sockfd = socket(PF_INET, SOCK_STREAM, 0);
> 	    setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
> 	    memset(&sin, 0, sizeof(struct sockaddr));
> 	    rsinlen = sizeof(struct sockaddr);
> 	    sin.sin_family = AF_INET;
> 	    sin.sin_port = htons(80);
> 	    sin.sin_addr.s_addr = INADDR_ANY;
>         bind(sockfd, (struct sockaddr *)&sin, sizeof(struct sockaddr));
>         listen(sockfd, 256);
>         while (1) {
>                 accefd = accept(sockfd, (struct sockaddr *)&rsin, &rsinlen);
>                 if (accefd >= 0) {
>                         pid = fork();
>                         if (pid < 0) {
>                                 printf("Parent: fork error\n");
>                                 close(accefd);
>                                 continue;
>                         }
>                         if (pid == 0) {
>                                 close(sockfd);
>                                 //close(accefd);
> 		/* in my test, althought I add this line the second time,
> 			it ran into the same situation */
>                                 process(accefd);
>                                 printf("Child return to parent\n");
>                                 close(accefd);
>                                 exit(0);
>                         } else {
>                                 waitpid(pid, NULL, 0);
>                                 printf("Parent exiting\n");
>                                 close(accefd);
>                                 exit(0);
>                         }
>                 }
>         }
>         return 0;
> }
> 
> int process(int fd) {
>         int i;
> 
>         printf("Child start\n");
>         close(fd);
>         printf("fd %d closed\n", fd);
> 
>         if (fork() > 0)
>                 return 0;
>         printf("in grandchild, infinite loop\n");
> 		while (1) ;
> }
> 
> While I compile and run this program in cygwin with gcc, and then telnet to 80 port, my telnet client can't disconnect and I have to use ^] to terminate. The same program tested in FreeBSD 5.0RC2, and got the following result.
> 
> su-2.05b# ./test
> su-2.05b# telnet localhost 80
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> Child start
> accept fd closed
> Child return to parent
> Parent exiting
> in grandchild, infinite loop
> Connection closed by foreign host.
> 
> The socket was closed automatively.
> 
> I'm wondering whether I dismissed something or this is a bug in cygwin. I spent hours in google and find many bugs description, but none of them is familiar with my problem.
> 
> My cygwin version is 2.194.2.24.


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