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1 /* $NetBSD: t_pidfile.c,v 1.3 2011/03/29 13:55:37 jmmv Exp $ */
2
3 /*
4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  * POSSIBILITY OF SUCH DAMAGE.
27  */
28
29 /*
30  * This file implements tests for the pidfile(3) functions.
31  *
32  * The tests here are tricky because we need to validate that the atexit(3)
33  * handler registered by pidfile(3) correctly deletes the generated pidfile.
34  * To do so:
35  * 1) We spawn a subprocess in every test case,
36  * 2) Run our test code in such subprocesses.  We cannot call any of the ATF
37  *    primitives from inside these.
38  * 3) Wait for the subprocess to terminate and ensure it exited successfully.
39  * 4) Check that the pidfile(s) created in the subprocess are gone.
40  *
41  * Additionally, pidfile(3) hardcodes a path to a directory writable only by
42  * root (/var/run).  This makes us require root privileges to execute these
43  * tests.
44  */
45
46 #include <sys/cdefs.h>
47 __COPYRIGHT("@(#) Copyright (c) 2011\
48  The NetBSD Foundation, inc. All rights reserved.");
49 __RCSID("$NetBSD: t_pidfile.c,v 1.3 2011/03/29 13:55:37 jmmv Exp $");
50
51 #include <sys/stat.h>
52 #include <sys/wait.h>
53
54 #include <assert.h>
55 #include <err.h>
56 #include <stdbool.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <paths.h>
60 #include <unistd.h>
61 #include <util.h>
62
63 #include <atf-c.h>
64
65 /* Used by routines that can be called both from the parent and the child
66  * code to implement proper error reporting. */
67 static bool in_child = false;
68
69 /* Callable from the test case child code. */
70 static void
71 check_pidfile(const char *path)
72 {
73         FILE *file;
74         int pid;
75
76         printf("Validating contents of pidfile '%s'\n", path);
77
78         if ((file = fopen(path, "r")) == NULL)
79                 errx(EXIT_FAILURE, "Cannot open expected pidfile '%s'", path);
80
81         if (fscanf(file, "%d", &pid) == -1)
82                 errx(EXIT_FAILURE, "Failed to read pid from pidfile '%s'",
83                     path);
84
85         printf("Read pid %d, current pid %d\n", pid, getpid());
86         if (pid != getpid())
87                 errx(EXIT_FAILURE, "Pid in pidfile (%d) does not match "
88                     "current pid (%d)", pid, getpid());
89 }
90
91 /* Callable from the test case parent/child code. */
92 static void
93 ensure_deleted(const char *path)
94 {
95         printf("Ensuring pidfile %s does not exist any more\n", path);
96         if (access(path, R_OK) != -1) {
97                 unlink(path);
98                 if (in_child)
99                         errx(EXIT_FAILURE, "The pidfile %s was not deleted",
100                             path);
101                 else
102                         atf_tc_fail("The pidfile %s was not deleted", path);
103         }
104 }
105
106 /* Callable from the test case parent code. */
107 static void
108 run_child(void (*child)(const char *), const char *cookie)
109 {
110         pid_t pid;
111
112         pid = fork();
113         ATF_REQUIRE(pid != -1);
114         if (pid == 0) {
115                 in_child = true;
116                 child(cookie);
117                 assert(false);
118                 /* UNREACHABLE */
119         } else {
120                 int status;
121
122                 ATF_REQUIRE(waitpid(pid, &status, 0) != -1);
123                 if (!WIFEXITED(status) || WEXITSTATUS(status) != EXIT_SUCCESS)
124                         atf_tc_fail("See stderr for details");
125         }
126 }
127
128 /* Callable from the test case parent/child code. */
129 static char *
130 generate_varrun_pidfile(const char *basename)
131 {
132         char *path;
133
134         if (asprintf(&path, "%s%s.pid", _PATH_VARRUN,
135             basename == NULL ? getprogname() : basename) == -1) {
136                 if (in_child)
137                         errx(EXIT_FAILURE, "Cannot allocate memory for path");
138                 else
139                         atf_tc_fail("Cannot allocate memory for path");
140         }
141
142         return path;
143 }
144
145 static void
146 helper_default_path(const char *path)
147 {
148
149         if (pidfile(NULL) == -1)
150                 errx(EXIT_FAILURE, "Failed to create pidfile with default "
151                     "basename");
152
153         check_pidfile(path);
154         exit(EXIT_SUCCESS);
155 }
156
157 ATF_TC(default_path);
158 ATF_TC_HEAD(default_path, tc)
159 {
160         atf_tc_set_md_var(tc, "require.user", "root");
161 }
162 ATF_TC_BODY(default_path, tc)
163 {
164         char *path;
165
166         path = generate_varrun_pidfile(NULL);
167         run_child(helper_default_path, path);
168         ensure_deleted(path);
169         free(path);
170 }
171
172 static void
173 helper_custom_basename(const char *path)
174 {
175
176         if (pidfile("custom-basename") == -1)
177                 errx(EXIT_FAILURE, "Failed to create pidfile with custom "
178                     "basename");
179
180         check_pidfile(path);
181         exit(EXIT_SUCCESS);
182 }
183
184 ATF_TC(custom_basename);
185 ATF_TC_HEAD(custom_basename, tc)
186 {
187         atf_tc_set_md_var(tc, "require.user", "root");
188 }
189 ATF_TC_BODY(custom_basename, tc)
190 {
191         char *path;
192
193         path = generate_varrun_pidfile("custom-basename");
194         run_child(helper_custom_basename, path);
195         ensure_deleted(path);
196         free(path);
197 }
198
199 static void
200 helper_custom_path(const char *path)
201 {
202
203         if (pidfile(path) == -1)
204                 errx(EXIT_FAILURE, "Failed to create pidfile '%s'", path);
205         check_pidfile(path);
206         exit(EXIT_SUCCESS);
207 }
208
209 ATF_TC_WITHOUT_HEAD(custom_path);
210 ATF_TC_BODY(custom_path, tc)
211 {
212
213         ATF_REQUIRE(mkdir("var", 0777) != -1);
214         ATF_REQUIRE(mkdir("var/run", 0777) != -1);
215
216         run_child(helper_custom_path, "./var/run/my-pidfile.pid");
217
218         ensure_deleted("./var/run/my-pidfile.pid");
219 }
220
221 static void
222 helper_change_basenames(const char *unused_cookie)
223 {
224         char *default_path;
225         char *custom_path;
226
227         default_path = generate_varrun_pidfile(NULL);
228         if (pidfile(NULL) == -1)
229                 errx(EXIT_FAILURE, "Failed to create pidfile with default "
230                     "basename");
231         check_pidfile(default_path);
232         if (pidfile(NULL) == -1)
233                 errx(EXIT_FAILURE, "Failed to recreate pidfile with default "
234                     "basename");
235         check_pidfile(default_path);
236
237         custom_path = generate_varrun_pidfile("custom-basename");
238         if (pidfile("custom-basename") == -1)
239                 errx(EXIT_FAILURE, "Failed to create pidfile with custom "
240                     "basename");
241         ensure_deleted(default_path);
242         check_pidfile(custom_path);
243         if (pidfile("custom-basename") == -1)
244                 errx(EXIT_FAILURE, "Failed to recreate pidfile with custom "
245                     "basename");
246         check_pidfile(custom_path);
247
248         free(custom_path);
249         free(default_path);
250         exit(EXIT_SUCCESS);
251 }
252
253 ATF_TC(change_basenames);
254 ATF_TC_HEAD(change_basenames, tc)
255 {
256         atf_tc_set_md_var(tc, "require.user", "root");
257 }
258 ATF_TC_BODY(change_basenames, tc)
259 {
260         char *default_path;
261         char *custom_path;
262
263         run_child(helper_change_basenames, NULL);
264
265         default_path = generate_varrun_pidfile(NULL);
266         custom_path = generate_varrun_pidfile("custom-basename");
267
268         ensure_deleted(default_path);
269         ensure_deleted(custom_path);
270
271         free(custom_path);
272         free(default_path);
273 }
274
275 static void
276 helper_change_paths(const char *unused_cookie)
277 {
278
279         if (pidfile("./var/run/first.pid") == -1)
280                 errx(EXIT_FAILURE, "Failed to create pidfile "
281                     "'./var/run/first.pid'");
282         check_pidfile("./var/run/first.pid");
283
284         if (pidfile("./second.pid") == -1)
285                 errx(EXIT_FAILURE, "Failed to create pidfile 'second.pid'");
286         ensure_deleted("./var/run/first.pid");
287         check_pidfile("./second.pid");
288
289         exit(EXIT_SUCCESS);
290 }
291
292 ATF_TC_WITHOUT_HEAD(change_paths);
293 ATF_TC_BODY(change_paths, tc)
294 {
295
296         ATF_REQUIRE(mkdir("var", 0777) != -1);
297         ATF_REQUIRE(mkdir("var/run", 0777) != -1);
298
299         run_child(helper_change_paths, NULL);
300
301         ensure_deleted("./var/run/my-pidfile.pid");
302         ensure_deleted("second.pid");
303 }
304
305 static void
306 helper_mix(const char *unused_cookie)
307 {
308         char *default_path;
309         char *custom_path;
310
311         default_path = generate_varrun_pidfile(NULL);
312         custom_path = generate_varrun_pidfile("custom-basename");
313
314         if (pidfile(NULL) == -1)
315                 errx(EXIT_FAILURE, "Failed to create default pidfile");
316         check_pidfile(default_path);
317
318         if (pidfile("./second.pid") == -1)
319                 errx(EXIT_FAILURE, "Failed to create pidfile 'second.pid'");
320         ensure_deleted(default_path);
321         check_pidfile("./second.pid");
322
323         if (pidfile("custom-basename") == -1)
324                 errx(EXIT_FAILURE, "Failed to create pidfile 'second.pid'");
325         ensure_deleted(default_path);
326         ensure_deleted("./second.pid");
327         ensure_deleted("./custom-basename");
328         check_pidfile(custom_path);
329
330         free(custom_path);
331         free(default_path);
332         exit(EXIT_SUCCESS);
333 }
334
335 ATF_TC(change_mix);
336 ATF_TC_HEAD(change_mix, tc)
337 {
338         atf_tc_set_md_var(tc, "require.user", "root");
339 }
340 ATF_TC_BODY(change_mix, tc)
341 {
342         char *default_path;
343
344         run_child(helper_mix, NULL);
345
346         default_path = generate_varrun_pidfile(NULL);
347         ensure_deleted(default_path);
348         ensure_deleted("second.pid");
349         free(default_path);
350 }
351
352 ATF_TP_ADD_TCS(tp)
353 {
354
355         ATF_TP_ADD_TC(tp, default_path);
356         ATF_TP_ADD_TC(tp, custom_basename);
357         ATF_TP_ADD_TC(tp, custom_path);
358         ATF_TP_ADD_TC(tp, change_basenames);
359         ATF_TP_ADD_TC(tp, change_paths);
360         ATF_TP_ADD_TC(tp, change_mix);
361
362         return atf_no_error();
363 }