115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*-
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* Copyright (C) 2016 Bryan Drewery <bdrewery@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Helper for mlock(3) to avoid EAGAIN errors
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <atf-c.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#define VM_MAX_WIRED "vm.max_user_wired"
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static void
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vm_max_wired_sysctl(u_long *old_value, u_long *new_value)
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{
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size_t old_len;
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size_t new_len = (new_value == NULL ? 0 : sizeof(*new_value));
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if (old_value == NULL)
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printf("Setting the new value to %lu\n", *new_value);
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else {
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ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, NULL, &old_len,
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new_value, new_len) == 0,
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"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
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}
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ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, old_value, &old_len,
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new_value, new_len) == 0,
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"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
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if (old_value != NULL)
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printf("Saved the old value (%lu)\n", *old_value);
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}
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void
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set_vm_max_wired(u_long new_value)
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{
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FILE *fp;
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u_long old_value;
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fp = fopen(VM_MAX_WIRED, "w");
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if (fp == NULL) {
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atf_tc_skip("could not open %s for writing: %s",
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VM_MAX_WIRED, strerror(errno));
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return;
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}
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vm_max_wired_sysctl(&old_value, NULL);
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ATF_REQUIRE_MSG(fprintf(fp, "%lu", old_value) > 0,
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"saving %s failed", VM_MAX_WIRED);
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fclose(fp);
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vm_max_wired_sysctl(NULL, &new_value);
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}
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void
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restore_vm_max_wired(void)
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{
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FILE *fp;
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u_long saved_max_wired;
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fp = fopen(VM_MAX_WIRED, "r");
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if (fp == NULL) {
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perror("fopen failed\n");
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return;
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}
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if (fscanf(fp, "%lu", &saved_max_wired) != 1) {
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perror("fscanf failed\n");
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fclose(fp);
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return;
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}
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fclose(fp);
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printf("old value in %s: %lu\n", VM_MAX_WIRED, saved_max_wired);
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if (saved_max_wired == 0) /* This will cripple the test host */
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return;
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vm_max_wired_sysctl(NULL, &saved_max_wired);
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}
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