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Date: Wed, 6 Apr 2011 18:19:35 +0200
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Subject: listen socket / poll block
From: Thomas Stalder <cygwinml AT gmail DOT com>
To: cygwin AT cygwin DOT com
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Hello,

I made a small application that block poll function.

the result is :

before pthread_create
after pthread_create
before poll
before shutdown socket
after shutdown socket
before close socket
after close socket


under linux the result is:

before pthread_create
after pthread_create
before poll
before shutdown socket
after shutdown socket
after poll ret=3D1
error accept failed: Invalid argument


The code of my application are :

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/poll.h>

int SocketFD;

void * my_thread(void* arg)
{
=A0 =A0struct sockaddr_in stSockAddr;
=A0 =A0int ret;
=A0 =A0struct pollfd p;
=A0 =A0SocketFD =3D socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

=A0 =A0if(-1 =3D=3D SocketFD)
=A0 =A0{
=A0 =A0 =A0 =A0perror("can not create socket");
=A0 =A0 =A0 =A0exit(EXIT_FAILURE);
=A0 =A0}

=A0 =A0memset(&stSockAddr, 0, sizeof(stSockAddr));
=A0 =A0stSockAddr.sin_family =3D AF_INET;
=A0 =A0stSockAddr.sin_port =3D htons(1100);
=A0 =A0stSockAddr.sin_addr.s_addr =3D INADDR_ANY;

=A0 =A0if(-1 =3D=3D bind(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(s=
tSockAddr)))
=A0 =A0{
=A0 =A0 =A0 =A0perror("error bind failed");
=A0 =A0 =A0 =A0close(SocketFD);
=A0 =A0 =A0 =A0exit(EXIT_FAILURE);
=A0 =A0}

=A0 =A0if(-1 =3D=3D listen(SocketFD, 10))
=A0 =A0{
=A0 =A0 =A0 =A0perror("error listen failed");
=A0 =A0 =A0 =A0close(SocketFD);
=A0 =A0 =A0 =A0exit(EXIT_FAILURE);
=A0 =A0}

=A0 =A0for(;;)
=A0 =A0{
=A0 =A0 =A0 =A0memset (&p, 0, sizeof (p));
=A0 =A0 =A0 =A0p.fd =3D SocketFD;
=A0 =A0 =A0 =A0p.events =3D POLLIN;
=A0 =A0 =A0 =A0p.revents =3D 0;
=A0 =A0 =A0 =A0printf("before poll\n");

=A0 =A0 =A0 =A0ret =3D poll (&p, 1, -1);
=A0 =A0 =A0 =A0printf("after poll ret=3D%d\n", ret);
=A0 =A0 =A0 =A0int ConnectFD =3D accept(SocketFD, NULL, NULL);

=A0 =A0 =A0 =A0if(0 > ConnectFD)
=A0 =A0 =A0 =A0{
=A0 =A0 =A0 =A0 =A0 =A0perror("error accept failed");
=A0 =A0 =A0 =A0 =A0 =A0close(SocketFD);
=A0 =A0 =A0 =A0 =A0 =A0exit(EXIT_FAILURE);
=A0 =A0 =A0 =A0}

=A0 =A0 =A0 =A0/* perform read write operations ...
=A0 =A0 =A0 =A0read(sockfd,buff,size)*/
=A0 =A0 =A0 =A0shutdown(ConnectFD, SHUT_RDWR);
=A0 =A0 =A0 =A0close(ConnectFD);
=A0 =A0}

=A0 =A0close(SocketFD);
=A0 =A0return 0;
}

int main(void)
{
=A0 =A0pthread_t id;
=A0 =A0printf("before pthread_create\n");
=A0 =A0pthread_create(&id, NULL, my_thread, NULL);
=A0 =A0printf("after pthread_create\n");
=A0 =A0sleep(3);
=A0 =A0printf("before shutdown socket\n");
=A0 =A0shutdown(SocketFD,2);
=A0 =A0printf("after shutdown socket\n");
=A0 =A0sleep(3);
=A0 =A0printf("before close socket\n");
=A0 =A0close(SocketFD);
=A0 =A0printf("after close socket\n");
=A0 =A0sleep(30);
}

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