Differential D19908 Diff 57363 head/lib/libc/tests/sys/mlock_helper.c

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head/lib/libc/tests/sys/mlock_helper.c

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	#include <sys/types.h>			#include <sys/types.h>
	#include <sys/sysctl.h>			#include <sys/sysctl.h>

	#include <atf-c.h>			#include <atf-c.h>
	#include <errno.h>			#include <errno.h>
	#include <limits.h>			#include <limits.h>
	#include <stdio.h>			#include <stdio.h>

	#define VM_MAX_WIRED "vm.max_wired"			#define VM_MAX_WIRED "vm.max_user_wired"

	static void			static void
	vm_max_wired_sysctl(int old_value, int new_value)			vm_max_wired_sysctl(u_long old_value, u_long new_value)
	{			{
	size_t old_len;			size_t old_len;
	size_t new_len = (new_value == NULL ? 0 : sizeof(int));			size_t new_len = (new_value == NULL ? 0 : sizeof(*new_value));

	if (old_value == NULL)			if (old_value == NULL)
	printf("Setting the new value to %d\n", *new_value);			printf("Setting the new value to %lu\n", *new_value);
	else {			else {
	ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, NULL, &old_len,			ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, NULL, &old_len,
	new_value, new_len) == 0,			new_value, new_len) == 0,
	"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));			"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
	}			}

	ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, old_value, &old_len,			ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, old_value, &old_len,
	new_value, new_len) == 0,			new_value, new_len) == 0,
	"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));			"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));

	if (old_value != NULL)			if (old_value != NULL)
	printf("Saved the old value (%d)\n", *old_value);			printf("Saved the old value (%lu)\n", *old_value);
	}			}

	void			void
	set_vm_max_wired(int new_value)			set_vm_max_wired(u_long new_value)
	{			{
	FILE *fp;			FILE *fp;
	int old_value;			u_long old_value;

	fp = fopen(VM_MAX_WIRED, "w");			fp = fopen(VM_MAX_WIRED, "w");
	if (fp == NULL) {			if (fp == NULL) {
	atf_tc_skip("could not open %s for writing: %s",			atf_tc_skip("could not open %s for writing: %s",
	VM_MAX_WIRED, strerror(errno));			VM_MAX_WIRED, strerror(errno));
	return;			return;
	}			}

	vm_max_wired_sysctl(&old_value, NULL);			vm_max_wired_sysctl(&old_value, NULL);

	ATF_REQUIRE_MSG(fprintf(fp, "%d", old_value) > 0,			ATF_REQUIRE_MSG(fprintf(fp, "%lu", old_value) > 0,
	"saving %s failed", VM_MAX_WIRED);			"saving %s failed", VM_MAX_WIRED);

	fclose(fp);			fclose(fp);

	vm_max_wired_sysctl(NULL, &new_value);			vm_max_wired_sysctl(NULL, &new_value);
	}			}

	void			void
	restore_vm_max_wired(void)			restore_vm_max_wired(void)
	{			{
	FILE *fp;			FILE *fp;
	int saved_max_wired;			u_long saved_max_wired;

	fp = fopen(VM_MAX_WIRED, "r");			fp = fopen(VM_MAX_WIRED, "r");
	if (fp == NULL) {			if (fp == NULL) {
	perror("fopen failed\n");			perror("fopen failed\n");
	return;			return;
	}			}

	if (fscanf(fp, "%d", &saved_max_wired) != 1) {			if (fscanf(fp, "%lu", &saved_max_wired) != 1) {
	perror("fscanf failed\n");			perror("fscanf failed\n");
	fclose(fp);			fclose(fp);
	return;			return;
	}			}

	fclose(fp);			fclose(fp);
	printf("old value in %s: %d\n", VM_MAX_WIRED, saved_max_wired);			printf("old value in %s: %lu\n", VM_MAX_WIRED, saved_max_wired);

	if (saved_max_wired == 0) /* This will cripple the test host */			if (saved_max_wired == 0) /* This will cripple the test host */
	return;			return;

	vm_max_wired_sysctl(NULL, &saved_max_wired);			vm_max_wired_sysctl(NULL, &saved_max_wired);
	}			}