aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/drivers/harddog_user.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/drivers/harddog_user.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/um/drivers/harddog_user.c')
-rw-r--r--arch/um/drivers/harddog_user.c143
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 000000000000..d934181b8d4c
--- /dev/null
+++ b/arch/um/drivers/harddog_user.c
@@ -0,0 +1,143 @@
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
17struct dog_data {
18 int stdin;
19 int stdout;
20 int close_me[2];
21};
22
23static 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
36int 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
112void stop_watchdog(int in_fd, int out_fd)
113{
114 os_close_file(in_fd);
115 os_close_file(out_fd);
116}
117
118int 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 */