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/*
* Copyright (c) 2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 "config.h"
#include "hs.h"
#include "ue2common.h"
#include "common.h"
#include "huge.h"
#ifndef _WIN32
#include <cstdio>
#include <cstring>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#if defined(HAVE_SHMGET)
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
UNUSED static int hsdb_shmid;
using namespace std;
long gethugepagesize(void);
hs_database_t *get_huge(hs_database_t *db) {
#if defined(HAVE_SHMGET) && defined(SHM_HUGETLB)
/* move the database to huge pages where possible, but fail politely */
hs_error_t err;
size_t len;
char *bytes;
long hpage_size = gethugepagesize();
if (hpage_size < 0) {
printf("Couldn't determine huge page size\n");
hsdb_shmid = -1;
return db;
}
err = hs_serialize_database(db, &bytes, &len);
if (err != HS_SUCCESS) {
printf("Failed to serialize database for copy: %d\n", err);
// this is weird - don't fail gracefully this time
return nullptr;
}
size_t size;
err = hs_serialized_database_size(bytes, len, &size);
if (err != HS_SUCCESS) {
printf("Failed to get database size: %d\n", err);
// this is weird - don't fail gracefully this time
return nullptr;
}
void *shmaddr;
if ((hsdb_shmid = shmget(IPC_PRIVATE, ROUNDUP_N(size, gethugepagesize()),
SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W)) < 0) {
// This could fail if the user doesn't have permission to shmget(),
// which is OK.
goto fini;
}
shmaddr = shmat(hsdb_shmid, nullptr, SHM_RND);
if (shmaddr == (char *)-1) {
perror("Shared memory attach failure");
goto fini;
}
// Mark this segment to be destroyed after this process detaches.
shmctl(hsdb_shmid, IPC_RMID, nullptr);
err = hs_deserialize_database_at(bytes, len, (hs_database_t *)shmaddr);
if (err != HS_SUCCESS) {
printf("Failed to deserialize database into shm: %d\n", err);
shmdt((const void *)shmaddr);
goto fini;
}
free(bytes);
hs_free_database(db);
return (hs_database_t *)shmaddr;
fini:
free(bytes);
hsdb_shmid = -1;
return db;
#else
return db;
#endif
}
void release_huge(hs_database_t *db) {
#if defined(HAVE_SHMGET) && defined(SHM_HUGETLB)
if (hsdb_shmid != -1) {
if (shmdt((const void *)db) != 0) {
perror("Detach failure");
}
} else {
// fallback
hs_free_database(db);
}
#else
hs_free_database(db);
#endif
}
#define BUF_SIZE 4096
static long read_meminfo(const char *tag) {
int fd;
char buf[BUF_SIZE];
int len;
char *p, *q;
long val;
fd = open("/proc/meminfo", O_RDONLY);
if (fd < 0) {
perror("Couldn't open /proc/meminfo");
return -1;
}
len = read(fd, buf, sizeof(buf));
close(fd);
if (len < 0) {
perror("Error reading /proc/meminfo");
return -1;
}
if (len == sizeof(buf)) {
printf("/proc/meminfo is too large\n");
return -1;
}
buf[len] = '\0';
p = strstr(buf, tag);
if (!p) {
return -1;
}
p += strlen(tag);
val = strtol(p, &q, 0);
if (!isspace(*q)) {
printf("Couldn't parse /proc/meminfo value\n");
return -1;
}
return val;
}
long gethugepagesize(void) {
long hpage_size;
int hpage_kb;
hpage_kb = read_meminfo("Hugepagesize:");
if (hpage_kb < 0) {
hpage_size = -1;
} else {
/* convert from kb to bytes */
hpage_size = 1024 * hpage_kb;
}
return hpage_size;
}
#else
/* No huge page support on WIN32. */
hs_database_t *get_huge(hs_database_t *db) { return db; }
void release_huge(hs_database_t *db) { hs_free_database(db); }
#endif
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