/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include "user_util.h"
#include "user.h"
#include "helper.h"
#include "mconsole.h"
#include "os.h"
#include "choose-mode.h"
#include "mode.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);
os_close_file(data->stdin);
os_close_file(data->stdout);
os_close_file(data->close_me[0]);
os_close_file(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", CHOOSE_MODE(tracing_pid, os_getpid()));
args = pid_args;
}
pid = run_helper(pre_exec, &data, args, NULL);
os_close_file(out_fds[0]);
os_close_file(in_fds[1]);
if(pid < 0){
err = -pid;
printk("harddog_open - run_helper failed, errno = %d\n", -err);
goto out_close_out;
}
n = os_read_file(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", -n);
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:
os_close_file(in_fds[0]);
os_close_file(in_fds[1]);
out_close_out:
os_close_file(out_fds[0]);
os_close_file(out_fds[1]);
out:
return(err);
}
void stop_watchdog(int in_fd, int out_fd)
{
os_close_file(in_fd);
os_close_file(out_fd);
}
int ping_watchdog(int fd)
{
int n;
char c = '\n';
n = os_write_file(fd, &c, sizeof(c));
if(n != sizeof(c)){
printk("ping_watchdog - write failed, err = %d\n", -n);
if(n < 0)
return(n);
return(-EIO);
}
return 1;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
