1 /*
2 * Copyright (c) International Business Machines Corp., 2004
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /*
20 * FILE NAME : mmapfile.c
21 *
22 * PURPOSE : This executable is invoked by the mmap test case to invoke
23 * mmap() from a process different than mmap. If mmap() is
24 * invoked by the mmap process, a hang will generally occur
25 * because sys_mmap obtains write access to mmap_sem, and any
26 * page fault within the same process (while process is
27 * responding to read/write event generated by mmap() call)
28 * requires read access to the same mmap_sem.
29 *
30 * PARAMETERS : argv[1] - name of file being memory mapped
31 * argv[2] - open flags:
32 * 0 - read-only
33 * 1 - write-only
34 * 2 - read-write
35 * argv[3] - offset within file of memory mapped region
36 * argv[4] - length of memory mapped region
37 * argv[5] - mmap() expected pass/fail status
38 * 0 - fail
39 * 1 - pass
40 *
41 */
42 #include <stdio.h>
43 #include <string.h>
44 #include <stdlib.h>
45 #include <errno.h>
46 #include <unistd.h>
47 #include <sys/mman.h>
48 #include <fcntl.h>
49 #include "dm_test.h"
50
51 char DummyFile[FILENAME_MAX];
52
main(int argc,char ** argv)53 int main(int argc, char **argv)
54 {
55 int rc;
56 int fd;
57 int openflags;
58 int offset;
59 int length;
60 int passflag;
61 int flags;
62 void *memmap;
63
64 if (--argc != 5) {
65 printf("usage: %s filename openflags offset length passflag\n",
66 argv[0]);
67 exit(-1);
68 }
69
70 passflag = atoi(argv[5]);
71 if ((passflag != 0) && (passflag != 1)) {
72 printf("%s error: invalid passflag %s\n", argv[0], argv[5]);
73 exit(-1);
74 }
75
76 length = atoi(argv[4]);
77 if (length < 0) {
78 printf("%s error: invalid length %s\n", argv[0], argv[4]);
79 exit(-1);
80 }
81
82 offset = atoi(argv[3]);
83 if (offset < 0) {
84 printf("%s error: invalid offset %s\n", argv[0], argv[3]);
85 exit(-1);
86 }
87 if (offset & (PAGE_SIZE - 1)) {
88 printf("%s error: unaligned offset %d\n", argv[0], offset);
89 exit(-1);
90 }
91
92 openflags = atoi(argv[2]);
93 if (openflags == O_RDONLY) {
94 flags = PROT_READ;
95 } else if (openflags == O_WRONLY) {
96 flags = PROT_WRITE;
97 } else if (openflags == O_RDWR) {
98 flags = PROT_READ | PROT_WRITE;
99 } else {
100 printf("%s error: invalid openflags %s\n", argv[0], argv[2]);
101 exit(-1);
102 }
103
104 printf("invoking open(%s, %d)\n", argv[1], openflags);
105 fd = open(argv[1], openflags);
106 if (fd == -1) {
107 printf("%s error: open failed with rc = %d (errno = %d)\n",
108 argv[0], rc, errno);
109 exit(-1);
110 }
111
112 printf("invoking memmap(%d, %d, %s, %d)\n", length, flags, argv[1],
113 offset);
114 memmap = mmap(NULL, length, flags, MAP_SHARED, fd, offset);
115 if (memmap == MAP_FAILED) {
116 printf("%s error: mmap failed with errno = %d\n", argv[0],
117 errno);
118 if (passflag) {
119 close(fd);
120 exit(-1);
121 }
122 }
123
124 EVENT_DELIVERY_DELAY;
125
126 if (memmap != MAP_FAILED) {
127 printf("invoking munmap(%p, %d)\n", memmap, length);
128 munmap(memmap, length);
129 }
130
131 close(fd);
132
133 _exit(0);
134 tst_exit();
135 }
136