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      1 /*	$NetBSD: t_nice.c,v 1.8 2012/03/18 07:00:51 jruoho Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jukka Ruohonen.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: t_nice.c,v 1.8 2012/03/18 07:00:51 jruoho Exp $");
     33 
     34 #include <sys/resource.h>
     35 #include <sys/wait.h>
     36 
     37 #include <atf-c.h>
     38 #include <errno.h>
     39 #include <limits.h>
     40 #include <pthread.h>
     41 #include <stdlib.h>
     42 #include <unistd.h>
     43 
     44 static void	*threadfunc(void *);
     45 
     46 static void *
     47 threadfunc(void *arg)
     48 {
     49 	int pri, val;
     50 
     51 	val = *(int *)arg;
     52 
     53 	errno = 0;
     54 	pri = getpriority(PRIO_PROCESS, 0);
     55 	ATF_REQUIRE(errno == 0);
     56 
     57 	if (pri != val)
     58 		atf_tc_fail("nice(3) value was not propagated to threads");
     59 
     60 	return NULL;
     61 }
     62 
     63 ATF_TC(nice_err);
     64 ATF_TC_HEAD(nice_err, tc)
     65 {
     66 	atf_tc_set_md_var(tc, "descr",
     67 	    "Test nice(3) for invalid parameters (PR lib/42587)");
     68 	atf_tc_set_md_var(tc, "require.user", "unprivileged");
     69 }
     70 
     71 ATF_TC_BODY(nice_err, tc)
     72 {
     73 	int i;
     74 
     75 	/*
     76 	 * The call should fail with EPERM if the
     77 	 * supplied parameter is negative and the
     78 	 * caller does not have privileges.
     79 	 */
     80 	for (i = -20; i < 0; i++) {
     81 
     82 		errno = 0;
     83 
     84 		ATF_REQUIRE_ERRNO(EPERM, nice(i) == -1);
     85 	}
     86 }
     87 
     88 ATF_TC(nice_priority);
     89 ATF_TC_HEAD(nice_priority, tc)
     90 {
     91 	atf_tc_set_md_var(tc, "descr", "Test nice(3) vs. getpriority(2)");
     92 }
     93 
     94 ATF_TC_BODY(nice_priority, tc)
     95 {
     96 	int i, pri, nic;
     97 	pid_t pid;
     98 	int sta;
     99 
    100 	for (i = 0; i <= 20; i++) {
    101 
    102 		nic = nice(i);
    103 		ATF_REQUIRE(nic != -1);
    104 
    105 		errno = 0;
    106 		pri = getpriority(PRIO_PROCESS, 0);
    107 		ATF_REQUIRE(errno == 0);
    108 
    109 		if (nic != pri)
    110 			atf_tc_fail("nice(3) and getpriority(2) conflict");
    111 
    112 		/*
    113 		 * Also verify that the nice(3) values
    114 		 * are inherited by child processes.
    115 		 */
    116 		pid = fork();
    117 		ATF_REQUIRE(pid >= 0);
    118 
    119 		if (pid == 0) {
    120 
    121 			errno = 0;
    122 			pri = getpriority(PRIO_PROCESS, 0);
    123 			ATF_REQUIRE(errno == 0);
    124 
    125 			if (nic != pri)
    126 				_exit(EXIT_FAILURE);
    127 
    128 			_exit(EXIT_SUCCESS);
    129 		}
    130 
    131 		(void)wait(&sta);
    132 
    133 		if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
    134 			atf_tc_fail("nice(3) value was not inherited");
    135 	}
    136 }
    137 
    138 ATF_TC(nice_root);
    139 ATF_TC_HEAD(nice_root, tc)
    140 {
    141 	atf_tc_set_md_var(tc, "descr", "Test that nice(3) works");
    142 	atf_tc_set_md_var(tc, "require.user", "root");
    143 }
    144 
    145 ATF_TC_BODY(nice_root, tc)
    146 {
    147 	int i;
    148 
    149 	for (i = -20; i <= 20; i++) {
    150 
    151 		ATF_REQUIRE(nice(i) != -1);
    152 	}
    153 }
    154 
    155 ATF_TC(nice_thread);
    156 ATF_TC_HEAD(nice_thread, tc)
    157 {
    158 	atf_tc_set_md_var(tc, "descr", "Test nice(3) with threads");
    159 }
    160 
    161 ATF_TC_BODY(nice_thread, tc)
    162 {
    163 	pthread_t tid[5];
    164 	int rv, val;
    165 	size_t i;
    166 
    167 	/*
    168 	 * Test that the scheduling priority is
    169 	 * propagated to all system scope threads.
    170 	 */
    171 	for (i = 0; i < __arraycount(tid); i++) {
    172 
    173 		val = nice(i);
    174 		ATF_REQUIRE(val != -1);
    175 
    176 		rv = pthread_create(&tid[i], NULL, threadfunc, &val);
    177 		ATF_REQUIRE(rv == 0);
    178 
    179 		rv = pthread_join(tid[i], NULL);
    180 		ATF_REQUIRE(rv == 0);
    181 	}
    182 }
    183 
    184 ATF_TP_ADD_TCS(tp)
    185 {
    186 
    187 	ATF_TP_ADD_TC(tp, nice_err);
    188 	ATF_TP_ADD_TC(tp, nice_priority);
    189 	ATF_TP_ADD_TC(tp, nice_root);
    190 	ATF_TP_ADD_TC(tp, nice_thread);
    191 
    192 	return atf_no_error();
    193 }
    194