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harddog_user.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include "os.h"
#include "user.h"

struct dog_data {
      int stdin;
      int stdout;
      int close_me[2];
};

static void pre_exec(void *d)
{
      struct dog_data *data = d;

      dup2(data->stdin, 0);
      dup2(data->stdout, 1);
      dup2(data->stdout, 2);
      close(data->stdin);
      close(data->stdout);
      close(data->close_me[0]);
      close(data->close_me[1]);
}

int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
{
      struct dog_data data;
      int in_fds[2], out_fds[2], pid, n, err;
      char pid_buf[sizeof("nnnnn\0")], c;
      char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
      char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL,
                          NULL };
      char **args = NULL;

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

      err = os_pipe(out_fds, 1, 0);
      if (err < 0) {
            printk("harddog_open - os_pipe failed, err = %d\n", -err);
            goto out_close_in;
      }

      data.stdin = out_fds[0];
      data.stdout = in_fds[1];
      data.close_me[0] = out_fds[1];
      data.close_me[1] = in_fds[0];

      if (sock != NULL) {
            mconsole_args[2] = sock;
            args = mconsole_args;
      }
      else {
            /* XXX The os_getpid() is not SMP correct */
            sprintf(pid_buf, "%d", os_getpid());
            args = pid_args;
      }

      pid = run_helper(pre_exec, &data, args);

      close(out_fds[0]);
      close(in_fds[1]);

      if (pid < 0) {
            err = -pid;
            printk("harddog_open - run_helper failed, errno = %d\n", -err);
            goto out_close_out;
      }

      n = read(in_fds[0], &c, sizeof(c));
      if (n == 0) {
            printk("harddog_open - EOF on watchdog pipe\n");
            helper_wait(pid);
            err = -EIO;
            goto out_close_out;
      }
      else if (n < 0) {
            printk("harddog_open - read of watchdog pipe failed, "
                   "err = %d\n", errno);
            helper_wait(pid);
            err = n;
            goto out_close_out;
      }
      *in_fd_ret = in_fds[0];
      *out_fd_ret = out_fds[1];
      return 0;

 out_close_in:
      close(in_fds[0]);
      close(in_fds[1]);
 out_close_out:
      close(out_fds[0]);
      close(out_fds[1]);
 out:
      return err;
}

void stop_watchdog(int in_fd, int out_fd)
{
      close(in_fd);
      close(out_fd);
}

int ping_watchdog(int fd)
{
      int n;
      char c = '\n';

      n = write(fd, &c, sizeof(c));
      if (n != sizeof(c)) {
            printk("ping_watchdog - write failed, ret = %d, err = %d\n",
                   n, errno);
            if (n < 0)
                  return n;
            return -EIO;
      }
      return 1;

}

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