t_spawnattr.c revision 272345 
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#define MAX(a, b)	(a) > (b) ? (a) : (b)
46#define MIN(a, b)	(a) > (b) ? (b) : (a)
47
48static int get_different_scheduler(void);
49static int get_different_priority(void);
50
51static int
52get_different_scheduler()
53{
54	int scheduler, max, min, new;
55
56	max = MAX(MAX(SCHED_FIFO, SCHED_OTHER), SCHED_RR);
57	min = MIN(MIN(SCHED_FIFO, SCHED_OTHER), SCHED_RR);
58
59	/* get current schedule policy */
60	scheduler = sched_getscheduler(0);
61
62	/* new scheduler */
63	new = (scheduler + 1);
64	if (new > max)
65		new = min;
66
67	return new;
68}
69
70static int
71get_different_priority()
72{
73	int scheduler, max, min, new, priority;
74	struct sched_param param;
75
76	/* get current schedule policy */
77	scheduler = sched_getscheduler(0);
78
79	max = sched_get_priority_max(scheduler);
80	min = sched_get_priority_min(scheduler);
81
82	sched_getparam(0, &param);
83	priority = param.sched_priority;
84
85	/* new schedule policy */
86	new = (priority + 1);
87	if (new > max)
88		new = min;
89
90	return new;
91}
92
93ATF_TC(t_spawnattr);
94
95ATF_TC_HEAD(t_spawnattr, tc)
96{
97	atf_tc_set_md_var(tc, "require.user", "root");
98	atf_tc_set_md_var(tc, "descr",
99	    "Tests posix_spawn with scheduler attributes");
100}
101
102ATF_TC_BODY(t_spawnattr, tc)
103{
104	int pid, scheduler, child_scheduler, priority, status, err, pfd[2];
105	char helper_arg[128];
106	char * const args[] = { __UNCONST("h_spawnattr"), helper_arg, NULL };
107	struct sched_param sp, child_sp;
108	sigset_t sig;
109	posix_spawnattr_t attr;
110	char helper[FILENAME_MAX];
111
112	/*
113	 * create a pipe to controll the child
114	 */
115	err = pipe(pfd);
116	ATF_REQUIRE_MSG(err == 0, "could not create pipe, errno %d", errno);
117	sprintf(helper_arg, "%d", pfd[0]);
118
119	posix_spawnattr_init(&attr);
120
121	scheduler = get_different_scheduler();
122	priority = get_different_priority();
123	sp.sched_priority = priority;
124
125	sigemptyset(&sig);
126	sigaddset(&sig, SIGUSR1);
127
128	posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSCHEDULER |
129		POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETPGROUP |
130		POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF |
131		POSIX_SPAWN_SETSIGDEF);
132	posix_spawnattr_setpgroup(&attr, 0);
133	posix_spawnattr_setschedparam(&attr, &sp);
134	posix_spawnattr_setschedpolicy(&attr, scheduler);
135	posix_spawnattr_setsigmask(&attr, &sig);
136	posix_spawnattr_setsigdefault(&attr, &sig);
137
138	sprintf(helper, "%s/h_spawnattr",
139	    atf_tc_get_config_var(tc, "srcdir"));
140	err = posix_spawn(&pid, helper, NULL, &attr, args, NULL);
141	ATF_REQUIRE_MSG(err == 0, "error %d", err);
142
143	child_scheduler = sched_getscheduler(pid);
144	ATF_REQUIRE_MSG(scheduler == child_scheduler,
145	    "scheduler = %d, child_scheduler = %d, pid %d, errno %d",
146	    scheduler, child_scheduler, pid, errno);
147
148	sched_getparam(pid, &child_sp);
149	ATF_REQUIRE_MSG(child_sp.sched_priority == sp.sched_priority,
150	    "priority is: %d, but we requested: %d",
151	    child_sp.sched_priority, sp.sched_priority);
152
153	ATF_REQUIRE_MSG(pid == getpgid(pid), "child pid: %d, child pgid: %d",
154	    pid, getpgid(pid));
155
156	/* ready, let child go */
157	write(pfd[1], "q", 1);
158	close(pfd[0]);
159	close(pfd[1]);
160
161	/* wait and check result from child */
162	waitpid(pid, &status, 0);
163	ATF_REQUIRE(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
164
165	posix_spawnattr_destroy(&attr);
166}
167
168ATF_TP_ADD_TCS(tp)
169{
170	ATF_TP_ADD_TC(tp, t_spawnattr);
171
172	return atf_no_error();
173}
174