1 /*	$NetBSD: t_renamerace.c,v 1.14 2017/01/13 21:30:40 christos Exp $	*/
2 
3 /*
4  * Modified for rump and atf from a program supplied
5  * by Nicolas Joly in kern/40948
6  */
7 
8 #include <sys/types.h>
9 #include <sys/mount.h>
10 #include <sys/utsname.h>
11 
12 #include <atf-c.h>
13 #include <errno.h>
14 #include <fcntl.h>
15 #include <pthread.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <unistd.h>
20 
21 #include <rump/rump.h>
22 #include <rump/rump_syscalls.h>
23 
24 #include <fs/tmpfs/tmpfs_args.h>
25 
26 #include "h_macros.h"
27 
28 ATF_TC(renamerace2);
29 ATF_TC_HEAD(renamerace2, tc)
30 {
31 	atf_tc_set_md_var(tc, "descr", "rename(2) lock order inversion");
32 	atf_tc_set_md_var(tc, "timeout", "6");
33 }
34 
35 static volatile int quittingtime = 0;
36 static pid_t wrkpid;
37 
38 static void *
39 r2w1(void *arg)
40 {
41 	int fd;
42 
43 	rump_pub_lwproc_newlwp(wrkpid);
44 
45 	fd = rump_sys_open("/file", O_CREAT | O_RDWR, 0777);
46 	if (fd == -1)
47 		atf_tc_fail_errno("creat");
48 	rump_sys_close(fd);
49 
50 	while (!quittingtime) {
51 		if (rump_sys_rename("/file", "/dir/file") == -1)
52 			atf_tc_fail_errno("rename 1");
53 		if (rump_sys_rename("/dir/file", "/file") == -1)
54 			atf_tc_fail_errno("rename 2");
55 	}
56 
57 	return NULL;
58 }
59 
60 static void *
61 r2w2(void *arg)
62 {
63 	int fd;
64 
65 	rump_pub_lwproc_newlwp(wrkpid);
66 
67 	while (!quittingtime) {
68 		fd = rump_sys_open("/dir/file1", O_RDWR);
69 		if (fd != -1)
70 			rump_sys_close(fd);
71 	}
72 
73 	return NULL;
74 }
75 
76 ATF_TC_BODY(renamerace2, tc)
77 {
78 	struct tmpfs_args args;
79 	pthread_t pt[2];
80 
81 	/*
82 	 * Force SMP regardless of how many host CPUs there are.
83 	 * Deadlock is highly unlikely to trigger otherwise.
84 	 */
85 	setenv("RUMP_NCPU", "2", 1);
86 
87 	rump_init();
88 	memset(&args, 0, sizeof(args));
89 	args.ta_version = TMPFS_ARGS_VERSION;
90 	args.ta_root_mode = 0777;
91 	if (rump_sys_mount(MOUNT_TMPFS, "/", 0, &args, sizeof(args)) == -1)
92 		atf_tc_fail_errno("could not mount tmpfs");
93 
94 	if (rump_sys_mkdir("/dir", 0777) == -1)
95 		atf_tc_fail_errno("cannot create directory");
96 
97 	RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
98 	RL(wrkpid = rump_sys_getpid());
99 	pthread_create(&pt[0], NULL, r2w1, NULL);
100 	pthread_create(&pt[1], NULL, r2w2, NULL);
101 
102 	/* usually triggers in <<1s for me */
103 	sleep(4);
104 	quittingtime = 1;
105 
106 	pthread_join(pt[0], NULL);
107 	pthread_join(pt[1], NULL);
108 }
109 
110 ATF_TP_ADD_TCS(tp)
111 {
112 	ATF_TP_ADD_TC(tp, renamerace2);
113 
114 	return atf_no_error();
115 }
116