143 строки
2.9 KiB
C
143 строки
2.9 KiB
C
/*
|
|
* 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 "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:
|
|
*/
|