ubd_user.c

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/* 
 * Copyright (C) 2000, 2001, 2002 Jeff Dike ([email protected])
 * Copyright (C) 2001 Ridgerun,Inc ([email protected])
 * Licensed under the GPL
 */

#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <endian.h>
#include <byteswap.h>

#include "ubd.h"
#include <os.h>

void ignore_sigwinch_sig(void)
{
    signal(SIGWINCH, SIG_IGN);
}

int start_io_thread(unsigned long sp, int *fd_out)
{
    int pid, fds[2], err;

    err = os_pipe(fds, 1, 1);
    if(err < 0){
        printk("start_io_thread - os_pipe failed, err = %d\n", -err);
        goto out;
    }

    kernel_fd = fds[0];
    *fd_out = fds[1];

    err = os_set_fd_block(*fd_out, 0);
    if (err) {
        printk("start_io_thread - failed to set nonblocking I/O.\n");
        goto out_close;
    }

    pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
    if(pid < 0){
        err = -errno;
        printk("start_io_thread - clone failed : errno = %d\n", errno);
        goto out_close;
    }

    return(pid);

 out_close:
    os_close_file(fds[0]);
    os_close_file(fds[1]);
    kernel_fd = -1;
    *fd_out = -1;
 out:
    return err;
}