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56599585 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2016 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include "alloc-util.h" | |
21 | #include "fd-util.h" | |
22 | #include "operation.h" | |
23 | #include "process-util.h" | |
24 | ||
25 | static int operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) { | |
26 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
27 | Operation *o = userdata; | |
28 | int r; | |
29 | ||
30 | assert(o); | |
31 | assert(si); | |
32 | ||
61233823 | 33 | log_debug("Operating " PID_FMT " is now complete with code=%s status=%i", |
56599585 LP |
34 | o->pid, |
35 | sigchld_code_to_string(si->si_code), si->si_status); | |
36 | ||
37 | o->pid = 0; | |
38 | ||
39 | if (si->si_code != CLD_EXITED) { | |
40 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally."); | |
41 | goto fail; | |
42 | } | |
43 | ||
03c2b288 LP |
44 | if (si->si_status == EXIT_SUCCESS) |
45 | r = 0; | |
46 | else if (read(o->errno_fd, &r, sizeof(r)) != sizeof(r)) { /* Try to acquire error code for failed operation */ | |
47 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed."); | |
56599585 LP |
48 | goto fail; |
49 | } | |
50 | ||
03c2b288 LP |
51 | if (o->done) { |
52 | /* A completion routine is set for this operation, call it. */ | |
53 | r = o->done(o, r, &error); | |
54 | if (r < 0) { | |
55 | if (!sd_bus_error_is_set(&error)) | |
56 | sd_bus_error_set_errno(&error, r); | |
57 | ||
58 | goto fail; | |
59 | } | |
60 | ||
61 | } else { | |
61233823 | 62 | /* The default operation when done is to simply return an error on failure or an empty success |
03c2b288 LP |
63 | * message on success. */ |
64 | if (r < 0) | |
65 | goto fail; | |
66 | ||
67 | r = sd_bus_reply_method_return(o->message, NULL); | |
68 | if (r < 0) | |
69 | log_error_errno(r, "Failed to reply to message: %m"); | |
70 | } | |
56599585 LP |
71 | |
72 | operation_free(o); | |
73 | return 0; | |
74 | ||
75 | fail: | |
76 | r = sd_bus_reply_method_error(o->message, &error); | |
77 | if (r < 0) | |
78 | log_error_errno(r, "Failed to reply to message: %m"); | |
79 | ||
80 | operation_free(o); | |
81 | return 0; | |
82 | } | |
83 | ||
03c2b288 | 84 | int operation_new(Manager *manager, Machine *machine, pid_t child, sd_bus_message *message, int errno_fd, Operation **ret) { |
56599585 LP |
85 | Operation *o; |
86 | int r; | |
87 | ||
795c5d31 LP |
88 | assert(manager); |
89 | assert(child > 1); | |
90 | assert(message); | |
91 | assert(errno_fd >= 0); | |
92 | ||
56599585 LP |
93 | o = new0(Operation, 1); |
94 | if (!o) | |
95 | return -ENOMEM; | |
96 | ||
03c2b288 LP |
97 | o->extra_fd = -1; |
98 | ||
795c5d31 | 99 | r = sd_event_add_child(manager->event, &o->event_source, child, WEXITED, operation_done, o); |
56599585 LP |
100 | if (r < 0) { |
101 | free(o); | |
102 | return r; | |
103 | } | |
104 | ||
105 | o->pid = child; | |
106 | o->message = sd_bus_message_ref(message); | |
107 | o->errno_fd = errno_fd; | |
108 | ||
795c5d31 LP |
109 | LIST_PREPEND(operations, manager->operations, o); |
110 | manager->n_operations++; | |
111 | o->manager = manager; | |
112 | ||
113 | if (machine) { | |
114 | LIST_PREPEND(operations_by_machine, machine->operations, o); | |
115 | o->machine = machine; | |
116 | } | |
56599585 LP |
117 | |
118 | log_debug("Started new operation " PID_FMT ".", child); | |
119 | ||
120 | /* At this point we took ownership of both the child and the errno file descriptor! */ | |
121 | ||
03c2b288 LP |
122 | if (ret) |
123 | *ret = o; | |
124 | ||
56599585 LP |
125 | return 0; |
126 | } | |
127 | ||
128 | Operation *operation_free(Operation *o) { | |
129 | if (!o) | |
130 | return NULL; | |
131 | ||
132 | sd_event_source_unref(o->event_source); | |
133 | ||
134 | safe_close(o->errno_fd); | |
03c2b288 | 135 | safe_close(o->extra_fd); |
56599585 LP |
136 | |
137 | if (o->pid > 1) | |
89c9030d | 138 | (void) sigkill_wait(o->pid); |
56599585 LP |
139 | |
140 | sd_bus_message_unref(o->message); | |
141 | ||
142 | if (o->manager) { | |
143 | LIST_REMOVE(operations, o->manager->operations, o); | |
144 | o->manager->n_operations--; | |
145 | } | |
146 | ||
795c5d31 LP |
147 | if (o->machine) |
148 | LIST_REMOVE(operations_by_machine, o->machine->operations, o); | |
149 | ||
56599585 LP |
150 | free(o); |
151 | return NULL; | |
152 | } |