1 /*
2  * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
3  * Copyright (c) 2016-2017 The strace developers.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include "tests.h"
30 #include <asm/unistd.h>
31 
32 #ifdef HAVE_READAHEAD
33 /* Check for glibc readahead argument passing bugs. */
34 # ifdef __GLIBC__
35 /*
36  * glibc < 2.8 had an incorrect order of higher and lower parts of offset,
37  * see https://sourceware.org/bugzilla/show_bug.cgi?id=5208
38  */
39 #  if !(defined __GLIBC_MINOR__ && \
40 	(__GLIBC__ << 16) + __GLIBC_MINOR__ >= (2 << 16) + 8)
41 #   undef HAVE_READAHEAD
42 #  endif /* glibc < 2.8 */
43 /*
44  * glibc < 2.25 had an incorrect implementation on mips n64,
45  * see https://sourceware.org/bugzilla/show_bug.cgi?id=21026
46  */
47 #  if defined LINUX_MIPSN64 && !(defined __GLIBC_MINOR__ && \
48 	(__GLIBC__ << 16) + __GLIBC_MINOR__ >= (2 << 16) + 25)
49 #   undef HAVE_READAHEAD
50 #  endif /* LINUX_MIPSN64 && glibc < 2.25 */
51 # endif /* __GLIBC__ */
52 #endif /* HAVE_READAHEAD */
53 
54 #ifdef HAVE_READAHEAD
55 
56 # include <fcntl.h>
57 # include <stdio.h>
58 
59 static const int fds[] = {
60 	-0x80000000,
61 	-100,
62 	-1,
63 	0,
64 	1,
65 	2,
66 	0x7fffffff,
67 };
68 
69 static const off64_t offsets[] = {
70 	-0x8000000000000000LL,
71 	-0x5060708090a0b0c0LL,
72 	-1LL,
73 	 0,
74 	 1,
75 	 0xbadfaced,
76 	 0x7fffffffffffffffLL,
77 };
78 
79 static const unsigned long counts[] = {
80 	0UL,
81 	0xdeadca75,
82 	(unsigned long) 0xface1e55beeff00dULL,
83 	(unsigned long) 0xffffffffffffffffULL,
84 };
85 
86 int
87 main(void)
88 {
89 	unsigned i;
90 	unsigned j;
91 	unsigned k;
92 	ssize_t rc;
93 
94 	for (i = 0; i < ARRAY_SIZE(fds); i++)
95 		for (j = 0; j < ARRAY_SIZE(offsets); j++)
96 			for (k = 0; k < ARRAY_SIZE(counts); k++) {
97 				rc = readahead(fds[i], offsets[j], counts[k]);
98 
99 				printf("readahead(%d, %lld, %lu) = %s\n",
100 					fds[i], (long long) offsets[j],
101 					counts[k], sprintrc(rc));
102 			}
103 
104 	puts("+++ exited with 0 +++");
105 	return 0;
106 }
107 
108 #else
109 
110 SKIP_MAIN_UNDEFINED("HAVE_READAHEAD")
111 
112 #endif
113