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-rw-r--r--src/machine/operation.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/src/machine/operation.c b/src/machine/operation.c
new file mode 100644
index 0000000..42c51f3
--- /dev/null
+++ b/src/machine/operation.c
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <sys/wait.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "operation.h"
+#include "process-util.h"
+
+static int operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ Operation *o = userdata;
+ int r;
+
+ assert(o);
+ assert(si);
+
+ log_debug("Operating " PID_FMT " is now complete with code=%s status=%i",
+ o->pid,
+ sigchld_code_to_string(si->si_code), si->si_status);
+
+ o->pid = 0;
+
+ if (si->si_code != CLD_EXITED) {
+ r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally.");
+ goto fail;
+ }
+
+ if (si->si_status == EXIT_SUCCESS)
+ r = 0;
+ else if (read(o->errno_fd, &r, sizeof(r)) != sizeof(r)) { /* Try to acquire error code for failed operation */
+ r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed.");
+ goto fail;
+ }
+
+ if (o->done) {
+ /* A completion routine is set for this operation, call it. */
+ r = o->done(o, r, &error);
+ if (r < 0) {
+ if (!sd_bus_error_is_set(&error))
+ sd_bus_error_set_errno(&error, r);
+
+ goto fail;
+ }
+
+ } else {
+ /* The default operation when done is to simply return an error on failure or an empty success
+ * message on success. */
+ if (r < 0) {
+ sd_bus_error_set_errno(&error, r);
+ goto fail;
+ }
+
+ r = sd_bus_reply_method_return(o->message, NULL);
+ if (r < 0)
+ log_error_errno(r, "Failed to reply to message: %m");
+ }
+
+ operation_free(o);
+ return 0;
+
+fail:
+ r = sd_bus_reply_method_error(o->message, &error);
+ if (r < 0)
+ log_error_errno(r, "Failed to reply to message: %m");
+
+ operation_free(o);
+ return 0;
+}
+
+int operation_new(Manager *manager, Machine *machine, pid_t child, sd_bus_message *message, int errno_fd, Operation **ret) {
+ Operation *o;
+ int r;
+
+ assert(manager);
+ assert(child > 1);
+ assert(message);
+ assert(errno_fd >= 0);
+
+ o = new0(Operation, 1);
+ if (!o)
+ return -ENOMEM;
+
+ o->extra_fd = -1;
+
+ r = sd_event_add_child(manager->event, &o->event_source, child, WEXITED, operation_done, o);
+ if (r < 0) {
+ free(o);
+ return r;
+ }
+
+ o->pid = child;
+ o->message = sd_bus_message_ref(message);
+ o->errno_fd = errno_fd;
+
+ LIST_PREPEND(operations, manager->operations, o);
+ manager->n_operations++;
+ o->manager = manager;
+
+ if (machine) {
+ LIST_PREPEND(operations_by_machine, machine->operations, o);
+ o->machine = machine;
+ }
+
+ log_debug("Started new operation " PID_FMT ".", child);
+
+ /* At this point we took ownership of both the child and the errno file descriptor! */
+
+ if (ret)
+ *ret = o;
+
+ return 0;
+}
+
+Operation *operation_free(Operation *o) {
+ if (!o)
+ return NULL;
+
+ sd_event_source_unref(o->event_source);
+
+ safe_close(o->errno_fd);
+ safe_close(o->extra_fd);
+
+ if (o->pid > 1)
+ (void) sigkill_wait(o->pid);
+
+ sd_bus_message_unref(o->message);
+
+ if (o->manager) {
+ LIST_REMOVE(operations, o->manager->operations, o);
+ o->manager->n_operations--;
+ }
+
+ if (o->machine)
+ LIST_REMOVE(operations_by_machine, o->machine->operations, o);
+
+ return mfree(o);
+}