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/* Copyright (C) 2018-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <sys/resource.h>
#include <support/check.h>
static int resources[] = {
/* The following 7 limits are part of POSIX and must exist. */
RLIMIT_CORE,
RLIMIT_CPU,
RLIMIT_DATA,
RLIMIT_FSIZE,
RLIMIT_NOFILE,
RLIMIT_STACK,
RLIMIT_AS
};
#define nresources (sizeof (resources) / sizeof (resources[0]))
/* Assume that the prlimit64 function calls the prlimit64 syscall without
mangling the arguments. */
#define PRLIMIT64_INFINITY ((rlim64_t) -1)
/* As we don't know which limit will be modified, use a sufficiently high
value to not shoot ourself in the foot. Use a 32-bit value to test
both the 32- and 64-bit versions, and keep the highest bit clear to
avoid sign extension. */
#define PRLIMIT64_TESTVAL ((rlim64_t) 0x42420000)
static void
test_getrlimit (int resource, rlim_t exp_cur, rlim_t exp_max)
{
struct rlimit r;
TEST_VERIFY_EXIT (getrlimit (resource, &r) == 0);
TEST_COMPARE (r.rlim_cur, exp_cur);
TEST_COMPARE (r.rlim_max, exp_max);
}
static void
test_getrlimit64 (int resource, rlim64_t exp_cur, rlim64_t exp_max)
{
struct rlimit64 r;
TEST_VERIFY_EXIT (getrlimit64 (resource, &r) == 0);
TEST_COMPARE (r.rlim_cur, exp_cur);
TEST_COMPARE (r.rlim_max, exp_max);
}
static void
test_prlimit_get (int resource, rlim_t exp_cur, rlim_t exp_max)
{
struct rlimit r;
TEST_VERIFY_EXIT (prlimit (0, resource, NULL, &r) == 0);
TEST_COMPARE (r.rlim_cur, exp_cur);
TEST_COMPARE (r.rlim_max, exp_max);
}
static void
test_prlimit64_get (int resource, rlim64_t exp_cur, rlim64_t exp_max)
{
struct rlimit64 r;
TEST_COMPARE (prlimit64 (0, resource, NULL, &r), 0);
TEST_COMPARE (r.rlim_cur, exp_cur);
TEST_COMPARE (r.rlim_max, exp_max);
}
static void
test_setrlimit (int resource, rlim_t new_cur, rlim_t new_max)
{
struct rlimit r = { new_cur, new_max };
TEST_COMPARE (setrlimit (resource, &r), 0);
}
static void
test_setrlimit64 (int resource, rlim64_t new_cur, rlim64_t new_max)
{
struct rlimit64 r = { new_cur, new_max };
TEST_COMPARE (setrlimit64 (resource, &r), 0);
}
static void
test_prlimit_set (int resource, rlim_t new_cur, rlim_t new_max)
{
struct rlimit r = { new_cur, new_max };
TEST_COMPARE (prlimit (0, resource, &r, NULL), 0);
}
static void
test_prlimit64_set (int resource, rlim64_t new_cur, rlim64_t new_max)
{
struct rlimit64 r = { new_cur, new_max };
TEST_COMPARE (prlimit64 (0, resource, &r, NULL), 0);
}
static int
do_test (void)
{
int resource = -1;
/* Find a resource with hard limit set to infinity, so that the soft limit
can be manipulated to any value. */
for (int i = 0; i < nresources; ++i)
{
struct rlimit64 r64;
int res = prlimit64 (0, resources[i], NULL, &r64);
if ((res == 0) && (r64.rlim_max == PRLIMIT64_INFINITY))
{
resource = resources[i];
break;
}
}
if (resource == -1)
FAIL_UNSUPPORTED
("Could not find and limit with hard limit set to infinity.");
/* First check that the get functions work correctly with the test value. */
test_prlimit64_set (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
test_getrlimit (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
test_getrlimit64 (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
test_prlimit_get (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
/* Then check that the get functions work correctly with infinity. */
test_prlimit64_set (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
test_getrlimit (resource, RLIM_INFINITY, RLIM_INFINITY);
test_getrlimit64 (resource, RLIM64_INFINITY, RLIM64_INFINITY);
test_prlimit_get (resource, RLIM_INFINITY, RLIM_INFINITY);
test_prlimit64_get (resource, RLIM64_INFINITY, RLIM64_INFINITY);
/* Then check that setrlimit works correctly with the test value. */
test_setrlimit (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
/* Then check that setrlimit works correctly with infinity. */
test_setrlimit (resource, RLIM_INFINITY, RLIM_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
/* Then check that setrlimit64 works correctly with the test value. */
test_setrlimit64 (resource, PRLIMIT64_TESTVAL, RLIM64_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
/* Then check that setrlimit64 works correctly with infinity. */
test_setrlimit64 (resource, RLIM64_INFINITY, RLIM64_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
/* Then check that prlimit works correctly with the test value. */
test_prlimit_set (resource, RLIM_INFINITY, RLIM_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_INFINITY, PRLIMIT64_INFINITY);
/* Finally check that prlimit works correctly with infinity. */
test_prlimit_set (resource, PRLIMIT64_TESTVAL, RLIM_INFINITY);
test_prlimit64_get (resource, PRLIMIT64_TESTVAL, PRLIMIT64_INFINITY);
return 0;
}
#include <support/test-driver.c>
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