1 /* $NetBSD: t_spawnattr.c,v 1.1 2012/02/13 21:03:08 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles Zhang <charles@NetBSD.org> and
9 * Martin Husemann <martin@NetBSD.org>.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <atf-c.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <sched.h>
40 #include <signal.h>
41 #include <spawn.h>
42 #include <unistd.h>
43 #include <sys/wait.h>
44
45 static int get_different_scheduler(void);
46 static int get_different_priority(int scheduler);
47
48 static const int schedulers[] = {
49 SCHED_OTHER,
50 SCHED_FIFO,
51 SCHED_RR
52 };
53
54 static int
get_different_scheduler(void)55 get_different_scheduler(void)
56 {
57 u_int i;
58 int scheduler;
59
60 /* get current schedule policy */
61 scheduler = sched_getscheduler(0);
62 for (i = 0; i < __arraycount(schedulers); i++) {
63 if (schedulers[i] == scheduler)
64 break;
65 }
66 ATF_REQUIRE_MSG(i < __arraycount(schedulers),
67 "Unknown current scheduler %d", scheduler);
68
69 /* new scheduler */
70 i++;
71 if (i >= __arraycount(schedulers))
72 i = 0;
73 return schedulers[i];
74 }
75
76 static int
get_different_priority(int scheduler)77 get_different_priority(int scheduler)
78 {
79 int max, min, new, priority;
80 struct sched_param param;
81
82 max = sched_get_priority_max(scheduler);
83 min = sched_get_priority_min(scheduler);
84
85 sched_getparam(0, ¶m);
86 priority = param.sched_priority;
87
88 /*
89 * Change numerical value of the priority, to ensure that it
90 * was set for the spawned child.
91 */
92 new = priority + 1;
93 if (new > max)
94 new = min;
95 return new;
96 }
97
98 ATF_TC(t_spawnattr);
99
ATF_TC_HEAD(t_spawnattr,tc)100 ATF_TC_HEAD(t_spawnattr, tc)
101 {
102 atf_tc_set_md_var(tc, "require.user", "root");
103 atf_tc_set_md_var(tc, "descr",
104 "Tests posix_spawn with scheduler attributes");
105 }
106
ATF_TC_BODY(t_spawnattr,tc)107 ATF_TC_BODY(t_spawnattr, tc)
108 {
109 int pid, scheduler, child_scheduler, priority, status, err, pfd[2];
110 char helper_arg[128];
111 char * const args[] = { __UNCONST("h_spawnattr"), helper_arg, NULL };
112 struct sched_param sp, child_sp;
113 sigset_t sig;
114 posix_spawnattr_t attr;
115 char helper[FILENAME_MAX];
116
117 /*
118 * create a pipe to controll the child
119 */
120 err = pipe(pfd);
121 ATF_REQUIRE_MSG(err == 0, "could not create pipe, errno %d", errno);
122 sprintf(helper_arg, "%d", pfd[0]);
123
124 posix_spawnattr_init(&attr);
125
126 scheduler = get_different_scheduler();
127 priority = get_different_priority(scheduler);
128 sp.sched_priority = priority;
129
130 sigemptyset(&sig);
131 sigaddset(&sig, SIGUSR1);
132
133 posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSCHEDULER |
134 POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETPGROUP |
135 POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF);
136 posix_spawnattr_setpgroup(&attr, 0);
137 posix_spawnattr_setschedparam(&attr, &sp);
138 posix_spawnattr_setschedpolicy(&attr, scheduler);
139 posix_spawnattr_setsigmask(&attr, &sig);
140 posix_spawnattr_setsigdefault(&attr, &sig);
141
142 sprintf(helper, "%s/h_spawnattr",
143 atf_tc_get_config_var(tc, "srcdir"));
144 err = posix_spawn(&pid, helper, NULL, &attr, args, NULL);
145 ATF_REQUIRE_MSG(err == 0, "error %d", err);
146
147 child_scheduler = sched_getscheduler(pid);
148 ATF_REQUIRE_MSG(scheduler == child_scheduler,
149 "scheduler = %d, child_scheduler = %d, pid %d, errno %d",
150 scheduler, child_scheduler, pid, errno);
151
152 sched_getparam(pid, &child_sp);
153 ATF_REQUIRE_MSG(child_sp.sched_priority == sp.sched_priority,
154 "priority is: %d, but we requested: %d",
155 child_sp.sched_priority, sp.sched_priority);
156
157 ATF_REQUIRE_MSG(pid == getpgid(pid), "child pid: %d, child pgid: %d",
158 pid, getpgid(pid));
159
160 /* ready, let child go */
161 write(pfd[1], "q", 1);
162 close(pfd[0]);
163 close(pfd[1]);
164
165 /* wait and check result from child */
166 waitpid(pid, &status, 0);
167 ATF_REQUIRE(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
168
169 posix_spawnattr_destroy(&attr);
170 }
171
ATF_TP_ADD_TCS(tp)172 ATF_TP_ADD_TCS(tp)
173 {
174 ATF_TP_ADD_TC(tp, t_spawnattr);
175
176 return atf_no_error();
177 }
178