1 /*
2  * Check decoding of getrlimit/ugetrlimit syscall.
3  *
4  * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include <errno.h>
31 #include <stdint.h>
32 #include <stdio.h>
33 #include <sys/resource.h>
34 #include <unistd.h>
35 
36 #include "xlat.h"
37 #include "xlat/resources.h"
38 
39 const char *
40 sprint_rlim(kernel_ulong_t lim)
41 {
42 	if (sizeof(lim) == sizeof(uint64_t)) {
43 		if (lim == (kernel_ulong_t) -1ULL)
44 			return "RLIM64_INFINITY";
45 	} else {
46 		if (lim == (kernel_ulong_t) -1U)
47 			return "RLIM_INFINITY";
48 	}
49 
50 	static char buf[2][sizeof(lim)*3 + sizeof("*1024")];
51 	static int i;
52 	i &= 1;
53 	if (lim > 1024 && lim % 1024 == 0)
54 		sprintf(buf[i], "%llu*1024", (unsigned long long) lim / 1024);
55 	else
56 		sprintf(buf[i], "%llu", (unsigned long long) lim);
57 
58 	return buf[i++];
59 }
60 
61 #ifdef NR_GETRLIMIT
62 
63 int
64 main(void)
65 {
66 	kernel_ulong_t *const rlimit = tail_alloc(sizeof(*rlimit) * 2);
67 	const struct xlat *xlat;
68 
69 	for (xlat = resources; xlat->str; ++xlat) {
70 		unsigned long res = 0xfacefeed00000000ULL | xlat->val;
71 		long rc = syscall(NR_GETRLIMIT, res, 0);
72 		if (rc && ENOSYS == errno)
73 			perror_msg_and_skip(STR_GETRLIMIT);
74 		printf("%s(%s, NULL) = %ld %s (%m)\n",
75 		       STR_GETRLIMIT, xlat->str, rc, errno2name());
76 
77 		rc = syscall(NR_GETRLIMIT, res, rlimit);
78 		if (rc)
79 			printf("%s(%s, NULL) = %ld %s (%m)\n",
80 			       STR_GETRLIMIT, xlat->str, rc, errno2name());
81 		else
82 			printf("%s(%s, {rlim_cur=%s, rlim_max=%s})"
83 			       " = 0\n", STR_GETRLIMIT, xlat->str,
84 			       sprint_rlim(rlimit[0]), sprint_rlim(rlimit[1]));
85 	}
86 
87 	puts("+++ exited with 0 +++");
88 	return 0;
89 }
90 
91 #endif /* NR_GETRLIMIT */
92