t_spawnattr.c revision 287551 
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 <sys/param.h>
34#include <atf-c.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <sched.h>
41#include <signal.h>
42#include <spawn.h>
43#include <unistd.h>
44#include <sys/wait.h>
45
46static int get_different_scheduler(void);
47static int get_different_priority(int scheduler);
48
49static const int schedulers[] = {
50	SCHED_OTHER,
51	SCHED_FIFO,
52	SCHED_RR
53};
54
55static int
56get_different_scheduler(void)
57{
58	u_int i;
59	int scheduler;
60
61	/* get current schedule policy */
62	scheduler = sched_getscheduler(0);
63	for (i = 0; i < nitems(schedulers); i++) {
64		if (schedulers[i] == scheduler)
65			break;
66	}
67	ATF_REQUIRE_MSG(i < nitems(schedulers),
68	    "Unknown current scheduler %d", scheduler);
69
70	/* new scheduler */
71	i++;
72	if (i >= nitems(schedulers))
73		i = 0;
74	return schedulers[i];
75}
76
77static int
78get_different_priority(int scheduler)
79{
80	int max, min, new, priority;
81	struct sched_param param;
82
83	max = sched_get_priority_max(scheduler);
84	min = sched_get_priority_min(scheduler);
85
86	sched_getparam(0, &param);
87	priority = param.sched_priority;
88
89	/*
90	 * Change numerical value of the priority, to ensure that it
91	 * was set for the spawned child.
92	 */
93	new = priority + 1;
94	if (new > max)
95		new = min;
96	return new;
97}
98
99ATF_TC(t_spawnattr);
100
101ATF_TC_HEAD(t_spawnattr, tc)
102{
103	atf_tc_set_md_var(tc, "require.user", "root");
104	atf_tc_set_md_var(tc, "descr",
105	    "Tests posix_spawn with scheduler attributes");
106}
107
108ATF_TC_BODY(t_spawnattr, tc)
109{
110	int pid, scheduler, child_scheduler, priority, status, err, pfd[2];
111	char helper_arg[128];
112	char * const args[] = { __UNCONST("h_spawnattr"), helper_arg, NULL };
113	struct sched_param sp, child_sp;
114	sigset_t sig;
115	posix_spawnattr_t attr;
116	char helper[FILENAME_MAX];
117
118	/*
119	 * create a pipe to controll the child
120	 */
121	err = pipe(pfd);
122	ATF_REQUIRE_MSG(err == 0, "could not create pipe, errno %d", errno);
123	sprintf(helper_arg, "%d", pfd[0]);
124
125	posix_spawnattr_init(&attr);
126
127	scheduler = get_different_scheduler();
128	priority = get_different_priority(scheduler);
129	sp.sched_priority = priority;
130
131	sigemptyset(&sig);
132	sigaddset(&sig, SIGUSR1);
133
134	posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSCHEDULER |
135	    POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETPGROUP |
136	    POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF);
137	posix_spawnattr_setpgroup(&attr, 0);
138	posix_spawnattr_setschedparam(&attr, &sp);
139	posix_spawnattr_setschedpolicy(&attr, scheduler);
140	posix_spawnattr_setsigmask(&attr, &sig);
141	posix_spawnattr_setsigdefault(&attr, &sig);
142
143	sprintf(helper, "%s/h_spawnattr",
144	    atf_tc_get_config_var(tc, "srcdir"));
145	err = posix_spawn(&pid, helper, NULL, &attr, args, NULL);
146	ATF_REQUIRE_MSG(err == 0, "error %d", err);
147
148	child_scheduler = sched_getscheduler(pid);
149	ATF_REQUIRE_MSG(scheduler == child_scheduler,
150	    "scheduler = %d, child_scheduler = %d, pid %d, errno %d",
151	    scheduler, child_scheduler, pid, errno);
152
153	sched_getparam(pid, &child_sp);
154	ATF_REQUIRE_MSG(child_sp.sched_priority == sp.sched_priority,
155	    "priority is: %d, but we requested: %d",
156	    child_sp.sched_priority, sp.sched_priority);
157
158	ATF_REQUIRE_MSG(pid == getpgid(pid), "child pid: %d, child pgid: %d",
159	    pid, getpgid(pid));
160
161	/* ready, let child go */
162	write(pfd[1], "q", 1);
163	close(pfd[0]);
164	close(pfd[1]);
165
166	/* wait and check result from child */
167	waitpid(pid, &status, 0);
168	ATF_REQUIRE(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
169
170	posix_spawnattr_destroy(&attr);
171}
172
173ATF_TP_ADD_TCS(tp)
174{
175	ATF_TP_ADD_TC(tp, t_spawnattr);
176
177	return atf_no_error();
178}
179