escribir en un socket cerrado no generó un SIGPIPE como se esperaba

I've already read about how to prevent SIGPIPE, then I write a small program to test it. Here is the code.

servidor.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

void hdl(int sig_num, siginfo_t *sig_info, void *context)
{
    printf("got you, SIGPIPE!\n");
}

int main()
{
    int sfd, cfd;
    struct sockaddr_in saddr, caddr;


    struct sigaction act;

    memset (&act, '\0', sizeof(act));
    act.sa_sigaction = hdl;
    act.sa_flags = SA_SIGINFO;

    if (sigaction(SIGPIPE, &act, NULL) < 0) {
        return 1;
    }

    sfd= socket(AF_INET, SOCK_STREAM, 0);
    saddr.sin_family=AF_INET;
    saddr.sin_addr.s_addr=inet_addr("192.168.22.91");
    saddr.sin_port=htons(12345);

    if(bind(sfd, (struct sockaddr *)&saddr, sizeof(saddr)) )
    {
        printf("bind error\n");
        return -1;
    }
    if(listen(sfd, 1))
    {
        printf("error\n");
        return -1;
    }

    char buf[1024] = {0};
    while(1) {
            printf("Server listening...\n");
            cfd=accept(sfd, (struct sockaddr *)NULL, NULL);

            fcntl(cfd, F_SETFL, O_NONBLOCK);
            int size = read(cfd, buf, 1024);

            if(size == -1)
                printf("read error\n");

            sleep(2); // sleep for a while to make sure the client closed the socket

            int ret;
            if((ret = write(cfd, buf, strlen(buf)))<0)
            {
                if(errno == EPIPE)
                    fprintf(stderr, "SIGPIPE");
            }

            ret = write(cfd, buf, strlen(buf)); // write again.
            printf("write return %d\n", ret);
    }
    close(sfd);
}

cliente.c

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


int main()
{
    int ret, fd;
    struct sockaddr_in sa_dst;
    char buffer[] = "hello, world";
    char rcv_buf[128] = {0};

    fd = socket(AF_INET, SOCK_STREAM, 0);

    memset(&sa_dst, 0, sizeof(struct sockaddr_in));
    sa_dst.sin_family = AF_INET;
    sa_dst.sin_port = htons(12345);
    sa_dst.sin_addr.s_addr = inet_addr("192.168.22.91"); 

    ret = connect(fd, (struct sockaddr *)&sa_dst, sizeof(struct sockaddr));
    if(ret != -1)
    {
        send(fd, buffer, strlen(buffer), 0);
        close(fd);
    }
    return 0;
}

When I run the server and the client on the same linux machine, on the server side, the first write() returns the number of bytes written while I expect a SIGPIPE signal because I closed the socket on the client side, the second write() does generate a SIGPIPE señal.
But when I ran the client on another linux machine or on a Windows machine(implement the same client with Winsock), I did't catch any SIGPIPE signal, and the second write() still returns the size of the buffer. Can someone tell me what's going on?