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Commit | Line | Data |
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61d0578b LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include "alloc-util.h" | |
4 | #include "fd-util.h" | |
5 | #include "portabled-operation.h" | |
6 | #include "process-util.h" | |
7 | ||
8 | static int operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) { | |
9 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
10 | Operation *o = userdata; | |
11 | int r; | |
12 | ||
13 | assert(o); | |
14 | assert(si); | |
15 | ||
16 | log_debug("Operating " PID_FMT " is now complete with code=%s status=%i", | |
17 | o->pid, | |
18 | sigchld_code_to_string(si->si_code), si->si_status); | |
19 | ||
20 | o->pid = 0; | |
21 | ||
22 | if (si->si_code != CLD_EXITED) { | |
23 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally."); | |
24 | goto fail; | |
25 | } | |
26 | ||
27 | if (si->si_status == EXIT_SUCCESS) | |
28 | r = 0; | |
29 | else if (read(o->errno_fd, &r, sizeof(r)) != sizeof(r)) { /* Try to acquire error code for failed operation */ | |
30 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed."); | |
31 | goto fail; | |
32 | } | |
33 | ||
34 | if (o->done) { | |
35 | /* A completion routine is set for this operation, call it. */ | |
36 | r = o->done(o, r, &error); | |
37 | if (r < 0) { | |
38 | if (!sd_bus_error_is_set(&error)) | |
39 | sd_bus_error_set_errno(&error, r); | |
40 | ||
41 | goto fail; | |
42 | } | |
43 | ||
44 | } else { | |
45 | /* The default operation when done is to simply return an error on failure or an empty success | |
46 | * message on success. */ | |
47 | if (r < 0) { | |
48 | sd_bus_error_set_errno(&error, r); | |
49 | goto fail; | |
50 | } | |
51 | ||
52 | r = sd_bus_reply_method_return(o->message, NULL); | |
53 | if (r < 0) | |
54 | log_error_errno(r, "Failed to reply to message: %m"); | |
55 | } | |
56 | ||
57 | operation_free(o); | |
58 | return 0; | |
59 | ||
60 | fail: | |
61 | r = sd_bus_reply_method_error(o->message, &error); | |
62 | if (r < 0) | |
63 | log_error_errno(r, "Failed to reply to message: %m"); | |
64 | ||
65 | operation_free(o); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | int operation_new(Manager *manager, pid_t child, sd_bus_message *message, int errno_fd, Operation **ret) { | |
70 | Operation *o; | |
71 | int r; | |
72 | ||
73 | assert(manager); | |
74 | assert(child > 1); | |
75 | assert(message); | |
76 | assert(errno_fd >= 0); | |
77 | ||
78 | o = new0(Operation, 1); | |
79 | if (!o) | |
80 | return -ENOMEM; | |
81 | ||
82 | o->extra_fd = -1; | |
83 | ||
84 | r = sd_event_add_child(manager->event, &o->event_source, child, WEXITED, operation_done, o); | |
85 | if (r < 0) { | |
86 | free(o); | |
87 | return r; | |
88 | } | |
89 | ||
90 | o->pid = child; | |
91 | o->message = sd_bus_message_ref(message); | |
92 | o->errno_fd = errno_fd; | |
93 | ||
94 | LIST_PREPEND(operations, manager->operations, o); | |
95 | manager->n_operations++; | |
96 | o->manager = manager; | |
97 | ||
98 | log_debug("Started new operation " PID_FMT ".", child); | |
99 | ||
100 | /* At this point we took ownership of both the child and the errno file descriptor! */ | |
101 | ||
102 | if (ret) | |
103 | *ret = o; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | Operation *operation_free(Operation *o) { | |
109 | if (!o) | |
110 | return NULL; | |
111 | ||
112 | sd_event_source_unref(o->event_source); | |
113 | ||
114 | safe_close(o->errno_fd); | |
115 | safe_close(o->extra_fd); | |
116 | ||
117 | if (o->pid > 1) | |
118 | (void) sigkill_wait(o->pid); | |
119 | ||
120 | sd_bus_message_unref(o->message); | |
121 | ||
122 | if (o->manager) { | |
123 | LIST_REMOVE(operations, o->manager->operations, o); | |
124 | o->manager->n_operations--; | |
125 | } | |
126 | ||
127 | return mfree(o); | |
128 | } |