diff options
Diffstat (limited to 'src/nspawn/nspawn-stub-pid1.c')
| -rw-r--r-- | src/nspawn/nspawn-stub-pid1.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/src/nspawn/nspawn-stub-pid1.c b/src/nspawn/nspawn-stub-pid1.c deleted file mode 100644 index 2de87e3c63..0000000000 --- a/src/nspawn/nspawn-stub-pid1.c +++ /dev/null @@ -1,170 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2016 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <sys/reboot.h> -#include <sys/unistd.h> -#include <sys/wait.h> - -#include "fd-util.h" -#include "log.h" -#include "nspawn-stub-pid1.h" -#include "process-util.h" -#include "signal-util.h" -#include "time-util.h" -#include "def.h" - -int stub_pid1(void) { - enum { - STATE_RUNNING, - STATE_REBOOT, - STATE_POWEROFF, - } state = STATE_RUNNING; - - sigset_t fullmask, oldmask, waitmask; - usec_t quit_usec = USEC_INFINITY; - pid_t pid; - int r; - - /* Implements a stub PID 1, that reaps all processes and processes a couple of standard signals. This is useful - * for allowing arbitrary processes run in a container, and still have all zombies reaped. */ - - assert_se(sigfillset(&fullmask) >= 0); - assert_se(sigprocmask(SIG_BLOCK, &fullmask, &oldmask) >= 0); - - pid = fork(); - if (pid < 0) - return log_error_errno(errno, "Failed to fork child pid: %m"); - - if (pid == 0) { - /* Return in the child */ - assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) >= 0); - setsid(); - return 0; - } - - reset_all_signal_handlers(); - - log_close(); - close_all_fds(NULL, 0); - log_open(); - - rename_process("STUBINIT"); - - assert_se(sigemptyset(&waitmask) >= 0); - assert_se(sigset_add_many(&waitmask, - SIGCHLD, /* posix: process died */ - SIGINT, /* sysv: ctrl-alt-del */ - SIGRTMIN+3, /* systemd: halt */ - SIGRTMIN+4, /* systemd: poweroff */ - SIGRTMIN+5, /* systemd: reboot */ - SIGRTMIN+6, /* systemd: kexec */ - SIGRTMIN+13, /* systemd: halt */ - SIGRTMIN+14, /* systemd: poweroff */ - SIGRTMIN+15, /* systemd: reboot */ - SIGRTMIN+16, /* systemd: kexec */ - -1) >= 0); - - /* Note that we ignore SIGTERM (sysv's reexec), SIGHUP (reload), and all other signals here, since we don't - * support reexec/reloading in this stub process. */ - - for (;;) { - siginfo_t si; - usec_t current_usec; - - si.si_pid = 0; - r = waitid(P_ALL, 0, &si, WEXITED|WNOHANG); - if (r < 0) { - r = log_error_errno(errno, "Failed to reap children: %m"); - goto finish; - } - - current_usec = now(CLOCK_MONOTONIC); - - if (si.si_pid == pid || current_usec >= quit_usec) { - - /* The child we started ourselves died or we reached a timeout. */ - - if (state == STATE_REBOOT) { /* dispatch a queued reboot */ - (void) reboot(RB_AUTOBOOT); - r = log_error_errno(errno, "Failed to reboot: %m"); - goto finish; - - } else if (state == STATE_POWEROFF) - (void) reboot(RB_POWER_OFF); /* if this fails, fall back to normal exit. */ - - if (si.si_pid == pid && si.si_code == CLD_EXITED) - r = si.si_status; /* pass on exit code */ - else - r = 255; /* signal, coredump, timeout, … */ - - goto finish; - } - if (si.si_pid != 0) - /* We reaped something. Retry until there's nothing more to reap. */ - continue; - - if (quit_usec == USEC_INFINITY) - r = sigwaitinfo(&waitmask, &si); - else { - struct timespec ts; - r = sigtimedwait(&waitmask, &si, timespec_store(&ts, quit_usec - current_usec)); - } - if (r < 0) { - if (errno == EINTR) /* strace -p attach can result in EINTR, let's handle this nicely. */ - continue; - if (errno == EAGAIN) /* timeout reached */ - continue; - - r = log_error_errno(errno, "Failed to wait for signal: %m"); - goto finish; - } - - if (si.si_signo == SIGCHLD) - continue; /* Let's reap this */ - - if (state != STATE_RUNNING) - continue; - - /* Would love to use a switch() statement here, but SIGRTMIN is actually a function call, not a - * constant… */ - - if (si.si_signo == SIGRTMIN+3 || - si.si_signo == SIGRTMIN+4 || - si.si_signo == SIGRTMIN+13 || - si.si_signo == SIGRTMIN+14) - - state = STATE_POWEROFF; - - else if (si.si_signo == SIGINT || - si.si_signo == SIGRTMIN+5 || - si.si_signo == SIGRTMIN+6 || - si.si_signo == SIGRTMIN+15 || - si.si_signo == SIGRTMIN+16) - - state = STATE_REBOOT; - else - assert_not_reached("Got unexpected signal"); - - /* (void) kill_and_sigcont(pid, SIGTERM); */ - quit_usec = now(CLOCK_MONOTONIC) + DEFAULT_TIMEOUT_USEC; - } - -finish: - _exit(r < 0 ? EXIT_FAILURE : r); -} |