153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "operation.h"
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#include "process-util.h"
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static int operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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Operation *o = userdata;
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int r;
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assert(o);
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assert(si);
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log_debug("Operating " PID_FMT " is now complete with code=%s status=%i",
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o->pid,
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sigchld_code_to_string(si->si_code), si->si_status);
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o->pid = 0;
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if (si->si_code != CLD_EXITED) {
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r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally.");
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goto fail;
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}
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if (si->si_status == EXIT_SUCCESS)
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r = 0;
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else if (read(o->errno_fd, &r, sizeof(r)) != sizeof(r)) { /* Try to acquire error code for failed operation */
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r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed.");
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goto fail;
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}
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if (o->done) {
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/* A completion routine is set for this operation, call it. */
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r = o->done(o, r, &error);
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if (r < 0) {
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if (!sd_bus_error_is_set(&error))
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sd_bus_error_set_errno(&error, r);
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goto fail;
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}
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} else {
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/* The default operation when done is to simply return an error on failure or an empty success
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* message on success. */
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if (r < 0)
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goto fail;
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r = sd_bus_reply_method_return(o->message, NULL);
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if (r < 0)
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log_error_errno(r, "Failed to reply to message: %m");
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}
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operation_free(o);
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return 0;
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fail:
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r = sd_bus_reply_method_error(o->message, &error);
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if (r < 0)
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log_error_errno(r, "Failed to reply to message: %m");
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operation_free(o);
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return 0;
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}
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int operation_new(Manager *manager, Machine *machine, pid_t child, sd_bus_message *message, int errno_fd, Operation **ret) {
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Operation *o;
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int r;
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assert(manager);
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assert(child > 1);
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assert(message);
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assert(errno_fd >= 0);
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o = new0(Operation, 1);
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if (!o)
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return -ENOMEM;
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o->extra_fd = -1;
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r = sd_event_add_child(manager->event, &o->event_source, child, WEXITED, operation_done, o);
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if (r < 0) {
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free(o);
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return r;
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}
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o->pid = child;
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o->message = sd_bus_message_ref(message);
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o->errno_fd = errno_fd;
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LIST_PREPEND(operations, manager->operations, o);
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manager->n_operations++;
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o->manager = manager;
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if (machine) {
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LIST_PREPEND(operations_by_machine, machine->operations, o);
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o->machine = machine;
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}
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log_debug("Started new operation " PID_FMT ".", child);
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/* At this point we took ownership of both the child and the errno file descriptor! */
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if (ret)
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*ret = o;
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return 0;
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}
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Operation *operation_free(Operation *o) {
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if (!o)
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return NULL;
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sd_event_source_unref(o->event_source);
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safe_close(o->errno_fd);
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safe_close(o->extra_fd);
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if (o->pid > 1)
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(void) sigkill_wait(o->pid);
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sd_bus_message_unref(o->message);
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if (o->manager) {
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LIST_REMOVE(operations, o->manager->operations, o);
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o->manager->n_operations--;
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}
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if (o->machine)
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LIST_REMOVE(operations_by_machine, o->machine->operations, o);
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free(o);
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return NULL;
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}
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