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89711996 ZJS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 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 <dirent.h> | |
21 | #include <errno.h> | |
22 | #include <sys/prctl.h> | |
23 | #include <sys/types.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "alloc-util.h" | |
27 | #include "dirent-util.h" | |
28 | #include "exec-util.h" | |
29 | #include "fd-util.h" | |
30 | #include "hashmap.h" | |
31 | #include "macro.h" | |
32 | #include "process-util.h" | |
33 | #include "set.h" | |
34 | #include "signal-util.h" | |
35 | #include "stat-util.h" | |
36 | #include "string-util.h" | |
37 | #include "strv.h" | |
38 | #include "util.h" | |
39 | ||
40 | /* Put this test here for a lack of better place */ | |
41 | assert_cc(EAGAIN == EWOULDBLOCK); | |
42 | ||
43 | static int do_execute(char **directories, usec_t timeout, char *argv[]) { | |
44 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; | |
45 | _cleanup_set_free_free_ Set *seen = NULL; | |
46 | char **directory; | |
47 | ||
48 | /* We fork this all off from a child process so that we can | |
49 | * somewhat cleanly make use of SIGALRM to set a time limit */ | |
50 | ||
51 | (void) reset_all_signal_handlers(); | |
52 | (void) reset_signal_mask(); | |
53 | ||
54 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); | |
55 | ||
56 | pids = hashmap_new(NULL); | |
57 | if (!pids) | |
58 | return log_oom(); | |
59 | ||
60 | seen = set_new(&string_hash_ops); | |
61 | if (!seen) | |
62 | return log_oom(); | |
63 | ||
64 | STRV_FOREACH(directory, directories) { | |
65 | _cleanup_closedir_ DIR *d; | |
66 | struct dirent *de; | |
67 | ||
68 | d = opendir(*directory); | |
69 | if (!d) { | |
70 | if (errno == ENOENT) | |
71 | continue; | |
72 | ||
73 | return log_error_errno(errno, "Failed to open directory %s: %m", *directory); | |
74 | } | |
75 | ||
76 | FOREACH_DIRENT(de, d, break) { | |
77 | _cleanup_free_ char *path = NULL; | |
78 | pid_t pid; | |
79 | int r; | |
80 | ||
81 | if (!dirent_is_file(de)) | |
82 | continue; | |
83 | ||
84 | if (set_contains(seen, de->d_name)) { | |
85 | log_debug("%1$s/%2$s skipped (%2$s was already seen).", *directory, de->d_name); | |
86 | continue; | |
87 | } | |
88 | ||
89 | r = set_put_strdup(seen, de->d_name); | |
90 | if (r < 0) | |
91 | return log_oom(); | |
92 | ||
93 | path = strjoin(*directory, "/", de->d_name); | |
94 | if (!path) | |
95 | return log_oom(); | |
96 | ||
97 | if (null_or_empty_path(path)) { | |
98 | log_debug("%s is empty (a mask).", path); | |
99 | continue; | |
100 | } | |
101 | ||
102 | pid = fork(); | |
103 | if (pid < 0) { | |
104 | log_error_errno(errno, "Failed to fork: %m"); | |
105 | continue; | |
106 | } else if (pid == 0) { | |
107 | char *_argv[2]; | |
108 | ||
109 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); | |
110 | ||
111 | if (!argv) { | |
112 | _argv[0] = path; | |
113 | _argv[1] = NULL; | |
114 | argv = _argv; | |
115 | } else | |
116 | argv[0] = path; | |
117 | ||
118 | execv(path, argv); | |
119 | return log_error_errno(errno, "Failed to execute %s: %m", path); | |
120 | } | |
121 | ||
122 | log_debug("Spawned %s as " PID_FMT ".", path, pid); | |
123 | ||
124 | r = hashmap_put(pids, PID_TO_PTR(pid), path); | |
125 | if (r < 0) | |
126 | return log_oom(); | |
127 | path = NULL; | |
128 | } | |
129 | } | |
130 | ||
131 | /* Abort execution of this process after the timout. We simply | |
132 | * rely on SIGALRM as default action terminating the process, | |
133 | * and turn on alarm(). */ | |
134 | ||
135 | if (timeout != USEC_INFINITY) | |
136 | alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC); | |
137 | ||
138 | while (!hashmap_isempty(pids)) { | |
139 | _cleanup_free_ char *path = NULL; | |
140 | pid_t pid; | |
141 | ||
142 | pid = PTR_TO_PID(hashmap_first_key(pids)); | |
143 | assert(pid > 0); | |
144 | ||
145 | path = hashmap_remove(pids, PID_TO_PTR(pid)); | |
146 | assert(path); | |
147 | ||
148 | wait_for_terminate_and_warn(path, pid, true); | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | void execute_directories(const char* const* directories, usec_t timeout, char *argv[]) { | |
155 | pid_t executor_pid; | |
156 | int r; | |
157 | char *name; | |
158 | char **dirs = (char**) directories; | |
159 | ||
160 | assert(!strv_isempty(dirs)); | |
161 | ||
162 | name = basename(dirs[0]); | |
163 | assert(!isempty(name)); | |
164 | ||
165 | /* Executes all binaries in the directories in parallel and waits | |
166 | * for them to finish. Optionally a timeout is applied. If a file | |
167 | * with the same name exists in more than one directory, the | |
168 | * earliest one wins. */ | |
169 | ||
170 | executor_pid = fork(); | |
171 | if (executor_pid < 0) { | |
172 | log_error_errno(errno, "Failed to fork: %m"); | |
173 | return; | |
174 | ||
175 | } else if (executor_pid == 0) { | |
176 | r = do_execute(dirs, timeout, argv); | |
177 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); | |
178 | } | |
179 | ||
180 | wait_for_terminate_and_warn(name, executor_pid, true); | |
181 | } |