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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
56599585 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2016 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
fe993888 MS |
21 | #include <sys/wait.h> |
22 | ||
56599585 LP |
23 | #include "alloc-util.h" |
24 | #include "fd-util.h" | |
25 | #include "operation.h" | |
26 | #include "process-util.h" | |
27 | ||
28 | static int operation_done(sd_event_source *s, const siginfo_t *si, void *userdata) { | |
29 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
30 | Operation *o = userdata; | |
31 | int r; | |
32 | ||
33 | assert(o); | |
34 | assert(si); | |
35 | ||
61233823 | 36 | log_debug("Operating " PID_FMT " is now complete with code=%s status=%i", |
56599585 LP |
37 | o->pid, |
38 | sigchld_code_to_string(si->si_code), si->si_status); | |
39 | ||
40 | o->pid = 0; | |
41 | ||
42 | if (si->si_code != CLD_EXITED) { | |
43 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child died abnormally."); | |
44 | goto fail; | |
45 | } | |
46 | ||
03c2b288 LP |
47 | if (si->si_status == EXIT_SUCCESS) |
48 | r = 0; | |
49 | else if (read(o->errno_fd, &r, sizeof(r)) != sizeof(r)) { /* Try to acquire error code for failed operation */ | |
50 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed."); | |
56599585 LP |
51 | goto fail; |
52 | } | |
53 | ||
03c2b288 LP |
54 | if (o->done) { |
55 | /* A completion routine is set for this operation, call it. */ | |
56 | r = o->done(o, r, &error); | |
57 | if (r < 0) { | |
58 | if (!sd_bus_error_is_set(&error)) | |
59 | sd_bus_error_set_errno(&error, r); | |
60 | ||
61 | goto fail; | |
62 | } | |
63 | ||
64 | } else { | |
61233823 | 65 | /* The default operation when done is to simply return an error on failure or an empty success |
03c2b288 | 66 | * message on success. */ |
3aca8326 LP |
67 | if (r < 0) { |
68 | sd_bus_error_set_errno(&error, r); | |
03c2b288 | 69 | goto fail; |
3aca8326 | 70 | } |
03c2b288 LP |
71 | |
72 | r = sd_bus_reply_method_return(o->message, NULL); | |
73 | if (r < 0) | |
74 | log_error_errno(r, "Failed to reply to message: %m"); | |
75 | } | |
56599585 LP |
76 | |
77 | operation_free(o); | |
78 | return 0; | |
79 | ||
80 | fail: | |
81 | r = sd_bus_reply_method_error(o->message, &error); | |
82 | if (r < 0) | |
83 | log_error_errno(r, "Failed to reply to message: %m"); | |
84 | ||
85 | operation_free(o); | |
86 | return 0; | |
87 | } | |
88 | ||
03c2b288 | 89 | int operation_new(Manager *manager, Machine *machine, pid_t child, sd_bus_message *message, int errno_fd, Operation **ret) { |
56599585 LP |
90 | Operation *o; |
91 | int r; | |
92 | ||
795c5d31 LP |
93 | assert(manager); |
94 | assert(child > 1); | |
95 | assert(message); | |
96 | assert(errno_fd >= 0); | |
97 | ||
56599585 LP |
98 | o = new0(Operation, 1); |
99 | if (!o) | |
100 | return -ENOMEM; | |
101 | ||
03c2b288 LP |
102 | o->extra_fd = -1; |
103 | ||
795c5d31 | 104 | r = sd_event_add_child(manager->event, &o->event_source, child, WEXITED, operation_done, o); |
56599585 LP |
105 | if (r < 0) { |
106 | free(o); | |
107 | return r; | |
108 | } | |
109 | ||
110 | o->pid = child; | |
111 | o->message = sd_bus_message_ref(message); | |
112 | o->errno_fd = errno_fd; | |
113 | ||
795c5d31 LP |
114 | LIST_PREPEND(operations, manager->operations, o); |
115 | manager->n_operations++; | |
116 | o->manager = manager; | |
117 | ||
118 | if (machine) { | |
119 | LIST_PREPEND(operations_by_machine, machine->operations, o); | |
120 | o->machine = machine; | |
121 | } | |
56599585 LP |
122 | |
123 | log_debug("Started new operation " PID_FMT ".", child); | |
124 | ||
125 | /* At this point we took ownership of both the child and the errno file descriptor! */ | |
126 | ||
03c2b288 LP |
127 | if (ret) |
128 | *ret = o; | |
129 | ||
56599585 LP |
130 | return 0; |
131 | } | |
132 | ||
133 | Operation *operation_free(Operation *o) { | |
134 | if (!o) | |
135 | return NULL; | |
136 | ||
137 | sd_event_source_unref(o->event_source); | |
138 | ||
139 | safe_close(o->errno_fd); | |
03c2b288 | 140 | safe_close(o->extra_fd); |
56599585 LP |
141 | |
142 | if (o->pid > 1) | |
89c9030d | 143 | (void) sigkill_wait(o->pid); |
56599585 LP |
144 | |
145 | sd_bus_message_unref(o->message); | |
146 | ||
147 | if (o->manager) { | |
148 | LIST_REMOVE(operations, o->manager->operations, o); | |
149 | o->manager->n_operations--; | |
150 | } | |
151 | ||
795c5d31 LP |
152 | if (o->machine) |
153 | LIST_REMOVE(operations_by_machine, o->machine->operations, o); | |
154 | ||
6b430fdb | 155 | return mfree(o); |
56599585 | 156 | } |