1 files changed, 143 insertions, 0 deletions
diff --git a/arch/um/drivers/harddog_user.c b/arch/um/drivers/harddog_user.c
new file mode 100644
index 00000000000..d934181b8d4
--- /dev/null
+++ b/arch/um/drivers/harddog_user.c
@@ -0,0 +1,143 @@
+/* 
+ * 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:
+ */