int lxc_execute(const char *name, char *const argv[], int quiet,
struct lxc_handler *handler, const char *lxcpath,
bool backgrounded)
{
struct execute_args args = {.argv = argv, .quiet = quiet};
if (lxc_check_inherited(handler->conf, false, &handler->conf->maincmd_fd, 1))
return -1;
handler->conf->is_execute = 1;
return __lxc_start(name, handler, &execute_start_ops, &args, lxcpath,
backgrounded);
}
int lxc_execute(const char *name, char *const argv[], int quiet,
struct lxc_conf *conf, const char *lxcpath)
{
struct execute_args args = {
.argv = argv,
.quiet = quiet
};
if (lxc_check_inherited(conf, -1))
return -1;
conf->is_execute = 1;
return __lxc_start(name, conf, &execute_start_ops, &args, lxcpath);
}
/* used to spawn a monitord either on startup of a daemon container, or when
* lxc-monitor starts
*/
int lxc_monitord_spawn(const char *lxcpath)
{
pid_t pid1,pid2;
int pipefd[2];
char pipefd_str[11];
char * const args[] = {
LXC_MONITORD_PATH,
(char *)lxcpath,
pipefd_str,
NULL,
};
/* double fork to avoid zombies when monitord exits */
pid1 = fork();
if (pid1 < 0) {
SYSERROR("failed to fork");
return -1;
}
if (pid1) {
if (waitpid(pid1, NULL, 0) != pid1)
return -1;
return 0;
}
if (pipe(pipefd) < 0) {
SYSERROR("failed to create pipe");
exit(EXIT_FAILURE);
}
pid2 = fork();
if (pid2 < 0) {
SYSERROR("failed to fork");
exit(EXIT_FAILURE);
}
if (pid2) {
char c;
/* wait for daemon to create socket */
close(pipefd[1]);
/* sync with child, we're ignoring the return from read
* because regardless if it works or not, either way we've
* synced with the child process. the if-empty-statement
* construct is to quiet the warn-unused-result warning.
*/
if (read(pipefd[0], &c, 1))
;
close(pipefd[0]);
exit(EXIT_SUCCESS);
}
if (setsid() < 0) {
SYSERROR("failed to setsid");
exit(EXIT_FAILURE);
}
lxc_check_inherited(NULL, pipefd[1]);
close(0);
close(1);
close(2);
open("/dev/null", O_RDONLY);
open("/dev/null", O_RDWR);
open("/dev/null", O_RDWR);
close(pipefd[0]);
sprintf(pipefd_str, "%d", pipefd[1]);
execvp(args[0], args);
exit(EXIT_FAILURE);
}