This is the user-cr patch corresponding to the logfile kernel
patch.
Logfile is specified using -l LOGFILE or --logfile=LOGFILE, i.e.
checkpoint $pid -o ckpt.out -l ckpt.debug
restart -l rstr.debug -i ckpt.out
If the logfile is unspecified, -1 will be sent for logfd to the kernel,
and there will be no debug log. If specified, then checkpoint and
restart debug msgs will be sent to the logfile.
Signed-off-by: Serge E. Hallyn <[email protected]>
---
checkpoint.c | 22 ++++++++++++++++++----
restart.c | 29 +++++++++++++++++++++++------
2 files changed, 41 insertions(+), 10 deletions(-)
diff --git a/checkpoint.c b/checkpoint.c
index c116daf..989e5c4 100644
--- a/checkpoint.c
+++ b/checkpoint.c
@@ -32,6 +32,7 @@ static char usage_str[] =
"\tOptions:\n"
" -h,--help print this help message\n"
" -o,--output=FILE write data to FILE instead of standard output\n"
+" -l,--logfile=FILE write kernel debug data to FILE (default=nowhere)\n"
" -c,--container require the PID is a container-init\n"
" -v,--verbose verbose output\n"
"";
@@ -40,11 +41,12 @@ struct args {
char *output;
int container;
int verbose;
+ char *logfile;
};
-inline static int checkpoint(pid_t pid, int fd, unsigned long flags)
+inline static int checkpoint(pid_t pid, int fd, unsigned long flags, int logfd)
{
- return syscall(__NR_checkpoint, pid, fd, flags);
+ return syscall(__NR_checkpoint, pid, fd, flags, logfd);
}
static void usage(char *str)
@@ -59,10 +61,11 @@ static void parse_args(struct args *args, int argc, char
*argv[])
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "container", no_argument, NULL, 'c' },
+ { "logfile", required_argument, NULL, 'l' },
{ "verbose", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 }
};
- static char optc[] = "hvco:";
+ static char optc[] = "hvco:l:";
while (1) {
int c = getopt_long(argc, argv, optc, opts, NULL);
@@ -79,6 +82,9 @@ static void parse_args(struct args *args, int argc, char
*argv[])
case 'c':
args->container = 1;
break;
+ case 'l':
+ args->logfile = optarg;
+ break;
case 'v':
args->verbose = 1;
break;
@@ -94,6 +100,7 @@ int main(int argc, char *argv[])
unsigned long flags = 0;
pid_t pid;
int ret;
+ int logfd;
memset(&args, 0, sizeof(args));
parse_args(&args, argc, argv);
@@ -125,8 +132,15 @@ int main(int argc, char *argv[])
if (ret != STDOUT_FILENO)
close(ret);
}
+ if (args.logfile) {
+ logfd = open(args.logfile, O_RDWR | O_CREAT, 0600);
+ if (logfd < 0) {
+ perror("open logfile");
+ exit(1);
+ }
+ }
- ret = checkpoint(pid, STDOUT_FILENO, flags);
+ ret = checkpoint(pid, STDOUT_FILENO, flags, logfd);
if (ret < 0) {
perror("checkpoint");
diff --git a/restart.c b/restart.c
index fbaab88..561b941 100644
--- a/restart.c
+++ b/restart.c
@@ -75,6 +75,7 @@ static char usage_str[] =
" -i,--input=FILE read data from FILE instead of standard input\n"
" --inspect inspect image on-the-fly for error records\n"
" -v,--verbose verbose output\n"
+" -l,--log=FILE logfile for kernel debug info\n"
" -d,--debug debugging output\n"
"";
@@ -194,9 +195,9 @@ static int str2sig(char *str)
return -1;
}
-inline static int restart(pid_t pid, int fd, unsigned long flags)
+inline static int restart(pid_t pid, int fd, unsigned long flags, int logfd)
{
- return syscall(__NR_restart, pid, fd, flags);
+ return syscall(__NR_restart, pid, fd, flags, logfd);
}
#define BUFSIZE (4 * 4096)
@@ -252,6 +253,8 @@ struct ckpt_ctx {
int pipe_out;
int pids_nr;
+ int logfd;
+
int pipe_child[2]; /* for children to report status */
int pipe_feed[2]; /* for feeder to provide input */
@@ -352,6 +355,7 @@ struct args {
int copy_status;
char *freezer;
char *input;
+ char *logfile;
};
static void usage(char *str)
@@ -390,10 +394,11 @@ static void parse_args(struct args *args, int argc, char
*argv[])
{ "no-wait", no_argument, NULL, 'W' },
{ "freezer", required_argument, NULL, 'F' },
{ "verbose", no_argument, NULL, 'v' },
+ { "log", required_argument, NULL, 'l' },
{ "debug", no_argument, NULL, 'd' },
{ NULL, 0, NULL, 0 }
};
- static char optc[] = "hdvpPwWF:r:i:";
+ static char optc[] = "hdvpPwWF:r:i:l:";
int sig;
@@ -416,6 +421,9 @@ static void parse_args(struct args *args, int argc, char
*argv[])
case 5: /* --inspect */
args->inspect = 1;
break;
+ case 'l':
+ args->logfile = optarg;
+ break;
case 'i':
args->input = optarg;
break;
@@ -666,6 +674,15 @@ int main(int argc, char *argv[])
close(ret);
}
+ ctx.logfd = -1;
+ if (args.logfile) {
+ ctx.logfd = open(args.logfile, O_RDWR | O_CREAT, 0600);
+ if (ctx.logfd < 0) {
+ perror("open log file");
+ exit(1);
+ }
+ }
+
/* freezer preparation */
if (args.freezer && freezer_prepare(&ctx) < 0)
exit(1);
@@ -678,7 +695,7 @@ int main(int argc, char *argv[])
/* self-restart ends here: */
if (args.self) {
- restart(getpid(), STDIN_FILENO, RESTART_TASKSELF);
+ restart(getpid(), STDIN_FILENO, RESTART_TASKSELF, ctx.logfd);
/* reach here if restart(2) failed ! */
perror("restart");
exit(1);
@@ -929,7 +946,7 @@ static int ckpt_coordinator(struct ckpt_ctx *ctx)
if (ctx->args->freezer)
flags |= RESTART_FROZEN;
- ret = restart(root_pid, STDIN_FILENO, flags);
+ ret = restart(root_pid, STDIN_FILENO, flags, ctx->logfd);
if (ret < 0) {
perror("restart failed");
@@ -1590,7 +1607,7 @@ static int ckpt_make_tree(struct ckpt_ctx *ctx, struct
task *task)
/* on success this doesn't return */
ckpt_dbg("about to call sys_restart(), flags %#lx\n", flags);
- ret = restart(0, STDIN_FILENO, flags);
+ ret = restart(0, STDIN_FILENO, flags, ctx->logfd);
if (ret < 0)
perror("task restore failed");
return ret;
--
1.6.1.1
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