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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 | ||
33 | log_debug("Operating " PID_FMT " is now complete with with code=%s status=%i", | |
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 | ||
44 | if (si->si_status != EXIT_SUCCESS) { | |
45 | if (read(o->errno_fd, &r, sizeof(r)) == sizeof(r)) | |
46 | r = sd_bus_error_set_errnof(&error, r, "%m"); | |
47 | else | |
48 | r = sd_bus_error_setf(&error, SD_BUS_ERROR_FAILED, "Child failed."); | |
49 | ||
50 | goto fail; | |
51 | } | |
52 | ||
53 | r = sd_bus_reply_method_return(o->message, NULL); | |
54 | if (r < 0) | |
55 | log_error_errno(r, "Failed to reply to message: %m"); | |
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 *m, pid_t child, sd_bus_message *message, int errno_fd) { | |
70 | Operation *o; | |
71 | int r; | |
72 | ||
73 | o = new0(Operation, 1); | |
74 | if (!o) | |
75 | return -ENOMEM; | |
76 | ||
77 | r = sd_event_add_child(m->event, &o->event_source, child, WEXITED, operation_done, o); | |
78 | if (r < 0) { | |
79 | free(o); | |
80 | return r; | |
81 | } | |
82 | ||
83 | o->pid = child; | |
84 | o->message = sd_bus_message_ref(message); | |
85 | o->errno_fd = errno_fd; | |
86 | ||
87 | LIST_PREPEND(operations, m->operations, o); | |
88 | m->n_operations++; | |
89 | o->manager = m; | |
90 | ||
91 | log_debug("Started new operation " PID_FMT ".", child); | |
92 | ||
93 | /* At this point we took ownership of both the child and the errno file descriptor! */ | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | Operation *operation_free(Operation *o) { | |
99 | if (!o) | |
100 | return NULL; | |
101 | ||
102 | sd_event_source_unref(o->event_source); | |
103 | ||
104 | safe_close(o->errno_fd); | |
105 | ||
106 | if (o->pid > 1) | |
107 | (void) sigkill_wait(&o->pid); | |
108 | ||
109 | sd_bus_message_unref(o->message); | |
110 | ||
111 | if (o->manager) { | |
112 | LIST_REMOVE(operations, o->manager->operations, o); | |
113 | o->manager->n_operations--; | |
114 | } | |
115 | ||
116 | free(o); | |
117 | return NULL; | |
118 | } |