strace/tests/xgetrlimit.c

/*
 * Check decoding of getrlimit/ugetrlimit syscall.
 *
 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/resource.h>
#include <unistd.h>

#include "xlat.h"
#include "xlat/resources.h"

const char *
sprint_rlim(kernel_ulong_t lim)
{
	if (sizeof(lim) == sizeof(uint64_t)) {
		if (lim == (kernel_ulong_t) -1ULL)
			return "RLIM64_INFINITY";
	} else {
		if (lim == (kernel_ulong_t) -1U)
			return "RLIM_INFINITY";
	}

	static char buf[2][sizeof(lim)*3 + sizeof("*1024")];
	static int i;
	i &= 1;
	if (lim > 1024 && lim % 1024 == 0)
		sprintf(buf[i], "%llu*1024", (unsigned long long) lim / 1024);
	else
		sprintf(buf[i], "%llu", (unsigned long long) lim);

	return buf[i++];
}

#ifdef NR_GETRLIMIT

int
main(void)
{
	kernel_ulong_t *const rlimit = tail_alloc(sizeof(*rlimit) * 2);
	const struct xlat *xlat;

	for (xlat = resources; xlat->str; ++xlat) {
		unsigned long res = 0xfacefeed00000000ULL | xlat->val;
		long rc = syscall(NR_GETRLIMIT, res, 0);
		if (rc && ENOSYS == errno)
			perror_msg_and_skip(STR_GETRLIMIT);
		printf("%s(%s, NULL) = %ld %s (%m)\n",
		       STR_GETRLIMIT, xlat->str, rc, errno2name());

		rc = syscall(NR_GETRLIMIT, res, rlimit);
		if (rc)
			printf("%s(%s, NULL) = %ld %s (%m)\n",
			       STR_GETRLIMIT, xlat->str, rc, errno2name());
		else
			printf("%s(%s, {rlim_cur=%s, rlim_max=%s})"
			       " = 0\n", STR_GETRLIMIT, xlat->str,
			       sprint_rlim(rlimit[0]), sprint_rlim(rlimit[1]));
	}

	puts("+++ exited with 0 +++");
	return 0;
}

#endif /* NR_GETRLIMIT */