From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-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! --- arch/um/drivers/harddog_user.c | 143 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 arch/um/drivers/harddog_user.c (limited to 'arch/um/drivers/harddog_user.c') 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 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include +#include +#include +#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: + */ -- cgit v1.2.2