// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <os.h>
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struct dog_data {
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int stdin_fd;
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int stdout_fd;
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int close_me[2];
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};
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static void pre_exec(void *d)
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{
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struct dog_data *data = d;
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dup2(data->stdin_fd, 0);
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dup2(data->stdout_fd, 1);
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dup2(data->stdout_fd, 2);
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close(data->stdin_fd);
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close(data->stdout_fd);
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close(data->close_me[0]);
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close(data->close_me[1]);
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}
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int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
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{
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struct dog_data data;
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int in_fds[2], out_fds[2], pid, n, err;
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char pid_buf[sizeof("nnnnnnn\0")], c;
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char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
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char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL,
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NULL };
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char **args = NULL;
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err = os_pipe(in_fds, 1, 0);
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if (err < 0) {
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printk("harddog_open - os_pipe failed, err = %d\n", -err);
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goto out;
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}
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err = os_pipe(out_fds, 1, 0);
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if (err < 0) {
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printk("harddog_open - os_pipe failed, err = %d\n", -err);
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goto out_close_in;
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}
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data.stdin_fd = out_fds[0];
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data.stdout_fd = in_fds[1];
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data.close_me[0] = out_fds[1];
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data.close_me[1] = in_fds[0];
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if (sock != NULL) {
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mconsole_args[2] = sock;
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args = mconsole_args;
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}
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else {
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/* XXX The os_getpid() is not SMP correct */
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sprintf(pid_buf, "%d", os_getpid());
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args = pid_args;
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}
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pid = run_helper(pre_exec, &data, args);
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close(out_fds[0]);
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close(in_fds[1]);
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if (pid < 0) {
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err = -pid;
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printk("harddog_open - run_helper failed, errno = %d\n", -err);
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goto out_close_out;
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}
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n = read(in_fds[0], &c, sizeof(c));
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if (n == 0) {
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printk("harddog_open - EOF on watchdog pipe\n");
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helper_wait(pid);
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err = -EIO;
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goto out_close_out;
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}
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else if (n < 0) {
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printk("harddog_open - read of watchdog pipe failed, "
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"err = %d\n", errno);
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helper_wait(pid);
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err = n;
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goto out_close_out;
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}
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*in_fd_ret = in_fds[0];
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*out_fd_ret = out_fds[1];
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return 0;
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out_close_in:
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close(in_fds[0]);
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close(in_fds[1]);
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out_close_out:
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close(out_fds[0]);
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close(out_fds[1]);
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out:
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return err;
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}
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void stop_watchdog(int in_fd, int out_fd)
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{
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close(in_fd);
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close(out_fd);
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}
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int ping_watchdog(int fd)
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{
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int n;
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char c = '\n';
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n = write(fd, &c, sizeof(c));
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if (n != sizeof(c)) {
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printk("ping_watchdog - write failed, ret = %d, err = %d\n",
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n, errno);
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if (n < 0)
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return n;
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return -EIO;
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}
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return 1;
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}
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