1 files changed, 129 insertions, 0 deletions
diff --git a/src/portable/portabled-operation.c b/src/portable/portabled-operation.c
new file mode 100644
index 0000000..53f33e5
--- /dev/null
+++ b/src/portable/portabled-operation.c
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "portabled-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 = ASSERT_PTR(userdata);
+        int r;
+
+        assert(si);
+
+        log_debug("Operation " 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_set(&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_set(&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, 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 = -EBADF;
+
+        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;
+
+        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--;
+        }
+
+        return mfree(o);
+}