diff options
| -rw-r--r-- | daemon/Makefile.am | 1 | ||||
| -rw-r--r-- | daemon/dmesg.c | 46 | ||||
| -rwxr-xr-x | src/generator.ml | 14 |
3 files changed, 61 insertions, 0 deletions
diff --git a/daemon/Makefile.am b/daemon/Makefile.am index 569f1ecc..20195cb7 100644 --- a/daemon/Makefile.am +++ b/daemon/Makefile.am @@ -29,6 +29,7 @@ guestfsd_SOURCES = \ debug.c \ devsparts.c \ dir.c \ + dmesg.c \ dropcaches.c \ ext2.c \ file.c \ diff --git a/daemon/dmesg.c b/daemon/dmesg.c new file mode 100644 index 00000000..2e58eb94 --- /dev/null +++ b/daemon/dmesg.c @@ -0,0 +1,46 @@ +/* libguestfs - the guestfsd daemon + * Copyright (C) 2009 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> + +#include "daemon.h" +#include "actions.h" + +char * +do_dmesg (void) +{ + char *out, *err; + int r; + + r = command (&out, &err, "dmesg", NULL); + if (r == -1) { + reply_with_error ("dmesg: %s", err); + free (out); + free (err); + return NULL; + } + free (err); + + return out; /* caller frees */ +} diff --git a/src/generator.ml b/src/generator.ml index 2ffe19da..92da3817 100755 --- a/src/generator.ml +++ b/src/generator.ml @@ -1752,6 +1752,20 @@ Setting C<whattodrop> to 3 should drop everything. This automatically calls L<sync(2)> before the operation, so that the maximum guest memory is freed."); + ("dmesg", (RString "kmsgs", []), 91, [], + [InitEmpty, TestRun ( + [["dmesg"]])], + "return kernel messages", + "\ +This returns the kernel messages (C<dmesg> output) from +the guest kernel. This is sometimes useful for extended +debugging of problems. + +Another way to get the same information is to enable +verbose messages with C<guestfs_set_verbose> or by setting +the environment variable C<LIBGUESTFS_DEBUG=1> before +running the program."); + ] let all_functions = non_daemon_functions @ daemon_functions |