break accept() with close()/shutdown()

q.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <pthread.h>

/* gcc -lpthread q.c  && ./a.out */

int fd;

    void*
worker(void *data)
{
    int rc;
    usleep( 1000*100 );

    rc = close( fd );
    /* rc = shutdown( fd, SHUT_RDWR ); */
    if ( rc != 0 ) {
        printf( "error close:%s\n", strerror( errno ) );
    }   
}

    int
main( int argc, char **argv )
{
    int rc;
    int cfd;
    struct sockaddr_in saddr;
    pthread_t tid;

    fd = socket( AF_INET, SOCK_STREAM, 0 );
    printf( "fd=%d\n", fd );

    bzero( &saddr, sizeof( saddr ) );
    saddr.sin_family = AF_INET;
    saddr.sin_addr.s_addr = htonl( INADDR_ANY );
    saddr.sin_port = htons( 8000 );

    rc = bind( fd, (struct sockaddr*)&saddr, sizeof(saddr) );
    if ( rc != 0 ) {
        printf( "error bind:%s\n", strerror( errno ) );
        exit( 1 );
    }

    rc = listen( fd, 128 );
    if ( rc != 0 ) {
        printf( "error listen:%s\n", strerror( errno ) );
        exit( 1 );
    }

    rc = pthread_create( &tid, NULL, worker, NULL );
    if ( 0 != rc ) {
        printf( "error pthread_create:%s\n", strerror( errno ) );
        exit( 1 );
    }

    cfd = accept( fd, (struct sockaddr*)NULL, NULL );
    printf( "client fd=%d\n", cfd );
    printf( "error accept:%s\n", strerror( errno ) );

    return 0;
}