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d7f89a9da4
The ubd io thread and UML kernel thread share the same errno, which can lead to conflicts when both call syscalls concurrently. Switch to the pthread-based helper to address this issue. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20250319135523.97050-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sched.h>
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#include <signal.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <endian.h>
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#include <byteswap.h>
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#include "ubd.h"
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#include <os.h>
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#include <poll.h>
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static struct pollfd kernel_pollfd;
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int start_io_thread(struct os_helper_thread **td_out, int *fd_out)
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{
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int fds[2], err;
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err = os_pipe(fds, 1, 1);
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if(err < 0){
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printk("start_io_thread - os_pipe failed, err = %d\n", -err);
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goto out;
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}
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kernel_fd = fds[0];
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kernel_pollfd.fd = kernel_fd;
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kernel_pollfd.events = POLLIN;
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*fd_out = fds[1];
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err = os_set_fd_block(*fd_out, 0);
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err = os_set_fd_block(kernel_fd, 0);
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if (err) {
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printk("start_io_thread - failed to set nonblocking I/O.\n");
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goto out_close;
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}
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err = os_run_helper_thread(td_out, io_thread, NULL);
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if (err < 0) {
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printk("%s - failed to run helper thread, err = %d\n",
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__func__, -err);
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goto out_close;
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}
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return 0;
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out_close:
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os_close_file(fds[0]);
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os_close_file(fds[1]);
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kernel_fd = -1;
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*fd_out = -1;
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out:
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return err;
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}
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int ubd_read_poll(int timeout)
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{
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kernel_pollfd.events = POLLIN;
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return poll(&kernel_pollfd, 1, timeout);
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}
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int ubd_write_poll(int timeout)
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{
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kernel_pollfd.events = POLLOUT;
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return poll(&kernel_pollfd, 1, timeout);
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}
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