t_nullpts.c revision 314817 
1/*	$NetBSD: t_nullpts.c,v 1.6 2017/01/13 21:30:40 christos Exp $	*/
2
3#include <sys/types.h>
4#include <sys/mount.h>
5#include <sys/ioctl.h>
6
7#include <atf-c.h>
8#include <err.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <stdio.h>
12#include <unistd.h>
13#include <string.h>
14#include <stdlib.h>
15
16#include <rump/rump.h>
17#include <rump/rump_syscalls.h>
18
19#include <fs/ptyfs/ptyfs.h>
20#include <miscfs/nullfs/null.h>
21
22#include "h_macros.h"
23
24static void
25mountptyfs(const char *mp, int flags)
26{
27	struct ptyfs_args args;
28
29	if (rump_sys_mkdir(mp, 0777) == -1) {
30		if (errno != EEXIST)
31			atf_tc_fail_errno("null create %s", mp);
32	}
33	memset(&args, 0, sizeof(args));
34	args.version = PTYFS_ARGSVERSION;
35	args.mode = 0777;
36	if (rump_sys_mount(MOUNT_PTYFS, mp, flags, &args, sizeof(args)) == -1)
37		atf_tc_fail_errno("could not mount ptyfs");
38}
39
40static void
41mountnull(const char *what, const char *mp, int flags)
42{
43	struct null_args nargs;
44
45	if (rump_sys_mkdir(what, 0777) == -1) {
46		if (errno != EEXIST)
47			atf_tc_fail_errno("null create %s", what);
48	}
49	if (rump_sys_mkdir(mp, 0777) == -1) {
50		if (errno != EEXIST)
51			atf_tc_fail_errno("null create %s", mp);
52	}
53	memset(&nargs, 0, sizeof(nargs));
54	nargs.nulla_target = __UNCONST(what);
55	if (rump_sys_mount(MOUNT_NULL, mp, flags, &nargs, sizeof(nargs)) == -1)
56		atf_tc_fail_errno("could not mount nullfs");
57}
58
59ATF_TC(nullrevoke);
60ATF_TC_HEAD(nullrevoke, tc)
61{
62	atf_tc_set_md_var(tc, "descr", "null mount ptyfs and revoke");
63}
64
65ATF_TC_BODY(nullrevoke, tc)
66{
67	char path[MAXPATHLEN];
68	struct ptmget ptg;
69	int ptm;
70
71	rump_init();
72
73	/*
74	 * mount /dev/pts
75	 */
76	mountptyfs("/dev/pts", 0);
77
78	/*
79	 * null mount /dev/pts to /null/dev/pts
80	 */
81	if (rump_sys_mkdir("/null", 0777) == -1) {
82		if (errno != EEXIST)
83			atf_tc_fail_errno("null create /null");
84	}
85	if (rump_sys_mkdir("/null/dev", 0777) == -1) {
86		if (errno != EEXIST)
87			atf_tc_fail_errno("null create /null/dev");
88	}
89
90	mountnull("/dev/pts", "/null/dev/pts", 0);
91
92	/*
93	 * get slave/master pair.
94	 */
95	ptm = rump_sys_open("/dev/ptm", O_RDWR);
96	if (rump_sys_ioctl(ptm, TIOCPTMGET, &ptg) == -1)
97		atf_tc_fail_errno("get pty");
98
99	/*
100	 * Build nullfs path to slave.
101	 */
102	strcpy(path, "/null");
103	strcat(path, ptg.sn);
104
105	/*
106	 * Open slave tty via nullfs.
107	 */
108	if (rump_sys_open(path, O_RDWR) == -1)
109		atf_tc_fail_errno("slave null open");
110
111	/*
112	 * Close slave opened with /dev/ptm.  Need purely non-null refs to it.
113	 */
114	rump_sys_close(ptg.sfd);
115
116	/* revoke slave tty. */
117	rump_sys_revoke(path);
118
119	/* done */
120}
121
122ATF_TP_ADD_TCS(tp)
123{
124
125	ATF_TP_ADD_TC(tp, nullrevoke);
126
127	return atf_no_error();
128}
129