11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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***/
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#include <sys/wait.h>
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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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sd_bus_error_set_errno(&error, r);
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goto fail;
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}
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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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return mfree(o);
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}
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