1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * Author: Rajeev Tiwari: rajeevti@in.ibm.com
4 * Copyright (c) 2004 Gernot Payer <gpayer@suse.de>
5 * Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /*
23 * This test case provides a functional validation for mincore system call.
24 * We mmap a file of known size (multiple of page size) and lock it in
25 * memory. Then we obtain page location information via mincore and compare
26 * the result with the expected value.
27 */
28
29 #include <sys/mman.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include <sys/wait.h>
33 #include <fcntl.h>
34 #include <unistd.h>
35 #include <signal.h>
36 #include <errno.h>
37
38 #include "test.h"
39 #include "safe_macros.h"
40
41 char *TCID = "mincore02";
42 int TST_TOTAL = 1;
43
44 static int fd = 0;
45 static void *addr = NULL;
46 static int page_size;
47 static int num_pages = 4;
48 static unsigned char *vec = NULL;
49
cleanup(void)50 static void cleanup(void)
51 {
52 free(vec);
53 munlock(addr, page_size * num_pages);
54 munmap(addr, page_size * num_pages);
55 close(fd);
56 tst_rmdir();
57 }
58
setup(void)59 static void setup(void)
60 {
61 char *buf;
62 size_t size;
63
64 tst_tmpdir();
65
66 page_size = getpagesize();
67 if (page_size == -1)
68 tst_brkm(TBROK | TERRNO, cleanup, "Unable to get page size");
69
70 size = page_size * num_pages;
71 buf = malloc(size);
72
73 memset(buf, 42, size);
74 vec = malloc((size + page_size - 1) / page_size);
75
76 fd = SAFE_OPEN(cleanup, "mincore02", O_CREAT | O_RDWR,
77 S_IRUSR | S_IWUSR);
78
79 /* fill the temporary file with two pages of data */
80 if (write(fd, buf, size) < 0) {
81 tst_brkm(TBROK | TERRNO, cleanup,
82 "Error in writing to the file");
83 }
84 free(buf);
85
86 addr = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
87 MAP_SHARED, fd, 0);
88
89 if (addr == MAP_FAILED) {
90 tst_brkm(TBROK | TERRNO, cleanup,
91 "Unable to map file for read/write");
92 }
93
94 /* lock mmapped file, so mincore returns "in core" for all pages */
95 if (mlock(addr, size) == -1)
96 tst_brkm(TBROK | TERRNO, cleanup, "Unable to lock the file");
97 }
98
main(int argc,char ** argv)99 int main(int argc, char **argv)
100 {
101 int lock_pages, counter;
102 int lc;
103
104 tst_parse_opts(argc, argv, NULL, NULL);
105
106 setup();
107
108 for (lc = 0; TEST_LOOPING(lc); lc++) {
109 tst_count = 0;
110
111 if (mincore(addr, num_pages * page_size, vec) == -1) {
112 tst_brkm(TBROK | TERRNO, cleanup,
113 "Unable to execute mincore system call");
114 }
115
116 /* check status of pages */
117 lock_pages = 0;
118
119 for (counter = 0; counter < num_pages; counter++) {
120 if (vec[counter] & 1)
121 lock_pages++;
122 }
123
124 if (lock_pages == num_pages) {
125 tst_resm(TPASS, "%d pages locked, %d pages in-core", num_pages,
126 lock_pages);
127 } else {
128 tst_resm(TFAIL,
129 "not all locked pages are in-core: no. locked: %d, no. in-core: %d",
130 num_pages, lock_pages);
131 }
132 }
133
134 cleanup();
135 tst_exit();
136 }
137