Commit | Line | Data |
---|---|---|
5bbcbeca | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <stdio.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
1da177e4 | 9 | #include "user.h" |
1da177e4 LT |
10 | #include "mconsole.h" |
11 | #include "os.h" | |
12 | #include "choose-mode.h" | |
13 | #include "mode.h" | |
14 | ||
15 | struct dog_data { | |
16 | int stdin; | |
17 | int stdout; | |
18 | int close_me[2]; | |
19 | }; | |
20 | ||
21 | static void pre_exec(void *d) | |
22 | { | |
23 | struct dog_data *data = d; | |
24 | ||
25 | dup2(data->stdin, 0); | |
26 | dup2(data->stdout, 1); | |
27 | dup2(data->stdout, 2); | |
28 | os_close_file(data->stdin); | |
29 | os_close_file(data->stdout); | |
30 | os_close_file(data->close_me[0]); | |
31 | os_close_file(data->close_me[1]); | |
32 | } | |
33 | ||
34 | int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock) | |
35 | { | |
36 | struct dog_data data; | |
37 | int in_fds[2], out_fds[2], pid, n, err; | |
38 | char pid_buf[sizeof("nnnnn\0")], c; | |
39 | char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL }; | |
5bbcbeca | 40 | char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL, |
1da177e4 LT |
41 | NULL }; |
42 | char **args = NULL; | |
43 | ||
44 | err = os_pipe(in_fds, 1, 0); | |
45 | if(err < 0){ | |
46 | printk("harddog_open - os_pipe failed, err = %d\n", -err); | |
47 | goto out; | |
48 | } | |
49 | ||
50 | err = os_pipe(out_fds, 1, 0); | |
51 | if(err < 0){ | |
52 | printk("harddog_open - os_pipe failed, err = %d\n", -err); | |
53 | goto out_close_in; | |
54 | } | |
55 | ||
56 | data.stdin = out_fds[0]; | |
57 | data.stdout = in_fds[1]; | |
58 | data.close_me[0] = out_fds[1]; | |
59 | data.close_me[1] = in_fds[0]; | |
60 | ||
61 | if(sock != NULL){ | |
62 | mconsole_args[2] = sock; | |
63 | args = mconsole_args; | |
64 | } | |
65 | else { | |
66 | /* XXX The os_getpid() is not SMP correct */ | |
67 | sprintf(pid_buf, "%d", CHOOSE_MODE(tracing_pid, os_getpid())); | |
68 | args = pid_args; | |
69 | } | |
70 | ||
c4399016 | 71 | pid = run_helper(pre_exec, &data, args); |
1da177e4 LT |
72 | |
73 | os_close_file(out_fds[0]); | |
74 | os_close_file(in_fds[1]); | |
75 | ||
76 | if(pid < 0){ | |
77 | err = -pid; | |
78 | printk("harddog_open - run_helper failed, errno = %d\n", -err); | |
79 | goto out_close_out; | |
80 | } | |
81 | ||
a6ea4cce | 82 | n = os_read_file(in_fds[0], &c, sizeof(c)); |
1da177e4 LT |
83 | if(n == 0){ |
84 | printk("harddog_open - EOF on watchdog pipe\n"); | |
85 | helper_wait(pid); | |
86 | err = -EIO; | |
87 | goto out_close_out; | |
88 | } | |
89 | else if(n < 0){ | |
90 | printk("harddog_open - read of watchdog pipe failed, " | |
91 | "err = %d\n", -n); | |
92 | helper_wait(pid); | |
93 | err = n; | |
94 | goto out_close_out; | |
95 | } | |
96 | *in_fd_ret = in_fds[0]; | |
97 | *out_fd_ret = out_fds[1]; | |
5bbcbeca | 98 | return 0; |
1da177e4 LT |
99 | |
100 | out_close_in: | |
101 | os_close_file(in_fds[0]); | |
102 | os_close_file(in_fds[1]); | |
103 | out_close_out: | |
104 | os_close_file(out_fds[0]); | |
105 | os_close_file(out_fds[1]); | |
106 | out: | |
5bbcbeca | 107 | return err; |
1da177e4 LT |
108 | } |
109 | ||
110 | void stop_watchdog(int in_fd, int out_fd) | |
111 | { | |
112 | os_close_file(in_fd); | |
113 | os_close_file(out_fd); | |
114 | } | |
115 | ||
116 | int ping_watchdog(int fd) | |
117 | { | |
118 | int n; | |
119 | char c = '\n'; | |
120 | ||
a6ea4cce | 121 | n = os_write_file(fd, &c, sizeof(c)); |
1da177e4 LT |
122 | if(n != sizeof(c)){ |
123 | printk("ping_watchdog - write failed, err = %d\n", -n); | |
124 | if(n < 0) | |
5bbcbeca JD |
125 | return n; |
126 | return -EIO; | |
1da177e4 LT |
127 | } |
128 | return 1; | |
129 | ||
130 | } |