[PATCH] restart: rename and cleanup switch to indicate signal-on-interrupt
Serge E. Hallyn
serue at us.ibm.com
Tue Sep 22 21:37:05 PDT 2009
Quoting Oren Laadan (orenl at librato.com):
> When restartinig in --wait mode, an interrupt to the coordinator
> translates to a signal to the root task. This patch fixes and
> imrpoves the interface and logic of sending such signals.
>
> Signed-off-by: Oren Laadan <orenl at cs.columbia.edu>
Acked-by: Serge Hallyn <serue at us.ibm.com>
> ---
> restart.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++-----------
> 1 files changed, 109 insertions(+), 23 deletions(-)
>
> diff --git a/restart.c b/restart.c
> index fbcc299..a25aaa9 100644
> --- a/restart.c
> +++ b/restart.c
> @@ -58,21 +58,22 @@ static char usage_str[] =
> "usage: restart [opts]\n"
> " restart restores from a checkpoint image by first creating in userspace\n"
> " the original tasks tree, and then calling sys_restart by each task.\n"
> -"\tOptions:\n"
> -"\t -h,--help print this help message\n"
> -"\t -p,--pidns create a new pid namspace (default with --pids)\n"
> -"\t -P,--no-pidns do not create a new pid namspace (default)\n"
> -"\t --pidns-intr=SIG send SIG to root task on SIGINT (default: SIGKILL)\n"
> -"\t --pids restore original pids (default with --pidns)\n"
> -"\t -i,--inspect inspect image on-the-fly for error records\n"
> -"\t -r,--root=ROOT restart under the directory ROOT instead of current\n"
> -"\t -w,--wait wait for (root) task to termiate (default)\n"
> -"\t --show-status show exit status of (root) task (implies -w)\n"
> -"\t --copy-status imitate exit status of (root) task (implies -w)\n"
> -"\t -W,--no-wait do not wait for (root) task to terminate\n"
> -"\t -F,--freezer=CGROUP freeze tasks in freezer group CGROUP on success\n"
> -"\t -v,--verbose verbose output\n"
> -"\t -d,--debug debugging output\n"
> +"Options:\n"
> +" -h,--help print this help message\n"
> +" -p,--pidns create a new pid namspace (default with --pids)\n"
> +" -P,--no-pidns do not create a new pid namespace (default)\n"
> +" --pids restore original pids (default with --pidns)\n"
> +" -i,--inspect inspect image on-the-fly for error records\n"
> +" -r,--root=ROOT restart under the directory ROOT instead of current\n"
> +" --signal=SIG send SIG to root task on SIGINT (default: SIGKILL\n"
> +" to container root, SIGINT otherwise)\n"
> +" -w,--wait wait for root task to termiate (default)\n"
> +" --show-status show exit status of root task (implies -w)\n"
> +" --copy-status imitate exit status of root task (implies -w)\n"
> +" -W,--no-wait do not wait for root task to terminate\n"
> +" -F,--freezer=CGROUP freeze tasks in freezer group CGROUP on success\n"
> +" -v,--verbose verbose output\n"
> +" -d,--debug debugging output\n"
> "";
>
> /*
> @@ -128,6 +129,69 @@ static char usage_str[] =
> printf(__VA_ARGS__); \
> } while(0)
>
> +#define SIGNAL_ENTRY(signal) { SIG ## signal, #signal }
> +
> +struct {
> + int signum;
> + char *sigstr;
> +} signal_array[] = {
> + { 0, "NONE" },
> + SIGNAL_ENTRY(ALRM),
> + SIGNAL_ENTRY(HUP),
> + SIGNAL_ENTRY(INT),
> + SIGNAL_ENTRY(KILL),
> + SIGNAL_ENTRY(PIPE),
> + SIGNAL_ENTRY(POLL),
> + SIGNAL_ENTRY(PROF),
> + SIGNAL_ENTRY(TERM),
> + SIGNAL_ENTRY(USR1),
> + SIGNAL_ENTRY(USR2),
> + SIGNAL_ENTRY(VTALRM),
> + SIGNAL_ENTRY(STKFLT),
> + SIGNAL_ENTRY(PWR),
> + SIGNAL_ENTRY(WINCH),
> + SIGNAL_ENTRY(CHLD),
> + SIGNAL_ENTRY(URG),
> + SIGNAL_ENTRY(TTIN),
> + SIGNAL_ENTRY(TTOU),
> + SIGNAL_ENTRY(STOP),
> + SIGNAL_ENTRY(CONT),
> + SIGNAL_ENTRY(ABRT),
> + SIGNAL_ENTRY(FPE),
> + SIGNAL_ENTRY(ILL),
> + SIGNAL_ENTRY(QUIT),
> + SIGNAL_ENTRY(SEGV),
> + SIGNAL_ENTRY(TRAP),
> + SIGNAL_ENTRY(SYS),
> + SIGNAL_ENTRY(BUS),
> + SIGNAL_ENTRY(XCPU),
> + SIGNAL_ENTRY(XFSZ),
> + { -1, "LAST" },
> +};
> +
> +static char *sig2str(int sig)
> +{
> + int i = 0;
> +
> + do {
> + if (signal_array[i].signum == sig)
> + return signal_array[i].sigstr;
> + } while (signal_array[++i].signum >= 0);
> + return "UNKNOWN SIGNAL";
> +}
> +
> +static int str2sig(char *str)
> +{
> + int sig = 0;
> +
> + do {
> + if (!strcmp(signal_array[sig].sigstr, str))
> + return signal_array[sig].signum;
> + } while (signal_array[++sig].signum >= 0);
> +
> + return -1;
> +}
> +
> inline static int restart(pid_t pid, int fd, unsigned long flags)
> {
> return syscall(__NR_restart, pid, fd, flags);
> @@ -287,14 +351,26 @@ static void usage(char *str)
> exit(1);
> }
>
> +/* negative retval means error */
> +static int str2num(char *str)
> +{
> + char *nptr;
> + int num;
> +
> + num = strtol(str, &nptr, 10);
> + if (nptr - str != strlen(str))
> + num = -1;
> + return num;
> +}
> +
> static void parse_args(struct args *args, int argc, char *argv[])
> {
> static struct option opts[] = {
> { "help", no_argument, NULL, 'h' },
> { "pidns", no_argument, NULL, 'p' },
> - { "pidns-signal", required_argument, NULL, '4' },
> { "no-pidns", no_argument, NULL, 'P' },
> { "pids", no_argument, NULL, 3 },
> + { "signal", required_argument, NULL, 4 },
> { "inspect", no_argument, NULL, 'i' },
> { "root", required_argument, NULL, 'r' },
> { "wait", no_argument, NULL, 'w' },
> @@ -336,9 +412,11 @@ static void parse_args(struct args *args, int argc, char *argv[])
> args->no_pidns = 1;
> break;
> case 4:
> - sig = atoi(optarg);
> + sig = str2sig(optarg);
> + if (sig < 0)
> + sig = str2num(optarg);
> if (sig < 0 || sig >= NSIG) {
> - printf("restart: invalid signal number\n");
> + printf("restart: invalid signal\n");
> exit(1);
> }
> global_send_sigint = sig;
> @@ -461,13 +539,21 @@ static void sigint_handler(int sig)
> {
> pid_t pid = global_child_pid;
>
> - ckpt_verbose("SIGINT sent to restarted tasks\n");
> + sig = global_send_sigint;
> + if (!sig) {
> + ckpt_verbose("Interrupt attempt .. ignored.\n");
> + return;
> + }
> +
> + ckpt_verbose("Interrupted: sent SIG%s to "
> + "restarted tasks\n", sig2str(sig));
>
> if (pid) {
> - ckpt_dbg("delegating SIGINT to child %d "
> - "(coordinator or root task)\n", pid);
> - kill(-pid, SIGINT);
> - kill(pid, SIGINT);
> + ckpt_dbg("delegating SIG%s to child %d "
> + "(coordinator/root task)\n",
> + sig2str(sig), pid);
> + kill(-pid, sig);
> + kill(pid, sig);
> }
> }
>
> --
> 1.6.0.4
>
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