Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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> | |
9 | #include "user_util.h" | |
10 | #include "user.h" | |
11 | #include "helper.h" | |
12 | #include "mconsole.h" | |
13 | #include "os.h" | |
14 | #include "choose-mode.h" | |
15 | #include "mode.h" | |
16 | ||
17 | struct dog_data { | |
18 | int stdin; | |
19 | int stdout; | |
20 | int close_me[2]; | |
21 | }; | |
22 | ||
23 | static void pre_exec(void *d) | |
24 | { | |
25 | struct dog_data *data = d; | |
26 | ||
27 | dup2(data->stdin, 0); | |
28 | dup2(data->stdout, 1); | |
29 | dup2(data->stdout, 2); | |
30 | os_close_file(data->stdin); | |
31 | os_close_file(data->stdout); | |
32 | os_close_file(data->close_me[0]); | |
33 | os_close_file(data->close_me[1]); | |
34 | } | |
35 | ||
36 | int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock) | |
37 | { | |
38 | struct dog_data data; | |
39 | int in_fds[2], out_fds[2], pid, n, err; | |
40 | char pid_buf[sizeof("nnnnn\0")], c; | |
41 | char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL }; | |
42 | char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL, | |
43 | NULL }; | |
44 | char **args = NULL; | |
45 | ||
46 | err = os_pipe(in_fds, 1, 0); | |
47 | if(err < 0){ | |
48 | printk("harddog_open - os_pipe failed, err = %d\n", -err); | |
49 | goto out; | |
50 | } | |
51 | ||
52 | err = os_pipe(out_fds, 1, 0); | |
53 | if(err < 0){ | |
54 | printk("harddog_open - os_pipe failed, err = %d\n", -err); | |
55 | goto out_close_in; | |
56 | } | |
57 | ||
58 | data.stdin = out_fds[0]; | |
59 | data.stdout = in_fds[1]; | |
60 | data.close_me[0] = out_fds[1]; | |
61 | data.close_me[1] = in_fds[0]; | |
62 | ||
63 | if(sock != NULL){ | |
64 | mconsole_args[2] = sock; | |
65 | args = mconsole_args; | |
66 | } | |
67 | else { | |
68 | /* XXX The os_getpid() is not SMP correct */ | |
69 | sprintf(pid_buf, "%d", CHOOSE_MODE(tracing_pid, os_getpid())); | |
70 | args = pid_args; | |
71 | } | |
72 | ||
73 | pid = run_helper(pre_exec, &data, args, NULL); | |
74 | ||
75 | os_close_file(out_fds[0]); | |
76 | os_close_file(in_fds[1]); | |
77 | ||
78 | if(pid < 0){ | |
79 | err = -pid; | |
80 | printk("harddog_open - run_helper failed, errno = %d\n", -err); | |
81 | goto out_close_out; | |
82 | } | |
83 | ||
84 | n = os_read_file(in_fds[0], &c, sizeof(c)); | |
85 | if(n == 0){ | |
86 | printk("harddog_open - EOF on watchdog pipe\n"); | |
87 | helper_wait(pid); | |
88 | err = -EIO; | |
89 | goto out_close_out; | |
90 | } | |
91 | else if(n < 0){ | |
92 | printk("harddog_open - read of watchdog pipe failed, " | |
93 | "err = %d\n", -n); | |
94 | helper_wait(pid); | |
95 | err = n; | |
96 | goto out_close_out; | |
97 | } | |
98 | *in_fd_ret = in_fds[0]; | |
99 | *out_fd_ret = out_fds[1]; | |
100 | return(0); | |
101 | ||
102 | out_close_in: | |
103 | os_close_file(in_fds[0]); | |
104 | os_close_file(in_fds[1]); | |
105 | out_close_out: | |
106 | os_close_file(out_fds[0]); | |
107 | os_close_file(out_fds[1]); | |
108 | out: | |
109 | return(err); | |
110 | } | |
111 | ||
112 | void stop_watchdog(int in_fd, int out_fd) | |
113 | { | |
114 | os_close_file(in_fd); | |
115 | os_close_file(out_fd); | |
116 | } | |
117 | ||
118 | int ping_watchdog(int fd) | |
119 | { | |
120 | int n; | |
121 | char c = '\n'; | |
122 | ||
123 | n = os_write_file(fd, &c, sizeof(c)); | |
124 | if(n != sizeof(c)){ | |
125 | printk("ping_watchdog - write failed, err = %d\n", -n); | |
126 | if(n < 0) | |
127 | return(n); | |
128 | return(-EIO); | |
129 | } | |
130 | return 1; | |
131 | ||
132 | } | |
133 | ||
134 | /* | |
135 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
136 | * Emacs will notice this stuff at the end of the file and automatically | |
137 | * adjust the settings for this buffer only. This must remain at the end | |
138 | * of the file. | |
139 | * --------------------------------------------------------------------------- | |
140 | * Local variables: | |
141 | * c-file-style: "linux" | |
142 | * End: | |
143 | */ |