t_spawnattr.c revision 314817 
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
45static int get_different_scheduler(void);
46static int get_different_priority(int scheduler);
47
48static const int schedulers[] = {
49	SCHED_OTHER,
50	SCHED_FIFO,
51	SCHED_RR
52};
53
54static int
55get_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
76static int
77get_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, &param);
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
98ATF_TC(t_spawnattr);
99
100ATF_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
107ATF_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
172ATF_TP_ADD_TCS(tp)
173{
174	ATF_TP_ADD_TC(tp, t_spawnattr);
175
176	return atf_no_error();
177}
178