Jeff Dike | 5bbcbec | 2007-02-10 01:43:58 -0800 | [diff] [blame] | 1 | /* |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <unistd.h> |
| 8 | #include <errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include "os.h" |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 10 | #include "user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | struct dog_data { |
| 13 | int stdin; |
| 14 | int stdout; |
| 15 | int close_me[2]; |
| 16 | }; |
| 17 | |
| 18 | static void pre_exec(void *d) |
| 19 | { |
| 20 | struct dog_data *data = d; |
| 21 | |
| 22 | dup2(data->stdin, 0); |
| 23 | dup2(data->stdout, 1); |
| 24 | dup2(data->stdout, 2); |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 25 | close(data->stdin); |
| 26 | close(data->stdout); |
| 27 | close(data->close_me[0]); |
| 28 | close(data->close_me[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | } |
| 30 | |
| 31 | int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock) |
| 32 | { |
| 33 | struct dog_data data; |
| 34 | int in_fds[2], out_fds[2], pid, n, err; |
| 35 | char pid_buf[sizeof("nnnnn\0")], c; |
| 36 | char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL }; |
Jeff Dike | 5bbcbec | 2007-02-10 01:43:58 -0800 | [diff] [blame] | 37 | char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | NULL }; |
| 39 | char **args = NULL; |
| 40 | |
| 41 | err = os_pipe(in_fds, 1, 0); |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 42 | if (err < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | printk("harddog_open - os_pipe failed, err = %d\n", -err); |
| 44 | goto out; |
| 45 | } |
| 46 | |
| 47 | err = os_pipe(out_fds, 1, 0); |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 48 | if (err < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | printk("harddog_open - os_pipe failed, err = %d\n", -err); |
| 50 | goto out_close_in; |
| 51 | } |
| 52 | |
| 53 | data.stdin = out_fds[0]; |
| 54 | data.stdout = in_fds[1]; |
| 55 | data.close_me[0] = out_fds[1]; |
| 56 | data.close_me[1] = in_fds[0]; |
| 57 | |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 58 | if (sock != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | mconsole_args[2] = sock; |
| 60 | args = mconsole_args; |
| 61 | } |
| 62 | else { |
| 63 | /* XXX The os_getpid() is not SMP correct */ |
Jeff Dike | 6aa802c | 2007-10-16 01:26:56 -0700 | [diff] [blame] | 64 | sprintf(pid_buf, "%d", os_getpid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | args = pid_args; |
| 66 | } |
| 67 | |
Jeff Dike | c439901 | 2007-07-15 23:38:56 -0700 | [diff] [blame] | 68 | pid = run_helper(pre_exec, &data, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 70 | close(out_fds[0]); |
| 71 | close(in_fds[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 73 | if (pid < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | err = -pid; |
| 75 | printk("harddog_open - run_helper failed, errno = %d\n", -err); |
| 76 | goto out_close_out; |
| 77 | } |
| 78 | |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 79 | n = read(in_fds[0], &c, sizeof(c)); |
| 80 | if (n == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | printk("harddog_open - EOF on watchdog pipe\n"); |
| 82 | helper_wait(pid); |
| 83 | err = -EIO; |
| 84 | goto out_close_out; |
| 85 | } |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 86 | else if (n < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | printk("harddog_open - read of watchdog pipe failed, " |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 88 | "err = %d\n", errno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | helper_wait(pid); |
| 90 | err = n; |
| 91 | goto out_close_out; |
| 92 | } |
| 93 | *in_fd_ret = in_fds[0]; |
| 94 | *out_fd_ret = out_fds[1]; |
Jeff Dike | 5bbcbec | 2007-02-10 01:43:58 -0800 | [diff] [blame] | 95 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | out_close_in: |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 98 | close(in_fds[0]); |
| 99 | close(in_fds[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | out_close_out: |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 101 | close(out_fds[0]); |
| 102 | close(out_fds[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | out: |
Jeff Dike | 5bbcbec | 2007-02-10 01:43:58 -0800 | [diff] [blame] | 104 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | void stop_watchdog(int in_fd, int out_fd) |
| 108 | { |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 109 | close(in_fd); |
| 110 | close(out_fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | int ping_watchdog(int fd) |
| 114 | { |
| 115 | int n; |
| 116 | char c = '\n'; |
| 117 | |
Jeff Dike | 8ca842c | 2007-10-16 01:27:08 -0700 | [diff] [blame] | 118 | n = write(fd, &c, sizeof(c)); |
| 119 | if (n != sizeof(c)) { |
| 120 | printk("ping_watchdog - write failed, ret = %d, err = %d\n", |
| 121 | n, errno); |
| 122 | if (n < 0) |
Jeff Dike | 5bbcbec | 2007-02-10 01:43:58 -0800 | [diff] [blame] | 123 | return n; |
| 124 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | } |
| 126 | return 1; |
| 127 | |
| 128 | } |