hcq/MaxScale
hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
MaxScale/server/modules/routing/binlog/blr_file.c
MassimilianoPinto 21509616e9 Fix routine argument type 
Fix routine argument type
2015-09-30 14:47:48 +02:00

1622 lines
51 KiB
C
Raw Blame History

/*
* This file is distributed as part of MaxScale. It is free
* software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation,
* version 2.
*
* This program 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright MariaDB Corporation Ab 2014-2015
*/
/**
* @file blr_file.c - contains code for the router binlog file management
*
*
* @verbatim
* Revision History
*
* Date Who Description
* 14/04/2014 Mark Riddoch Initial implementation
* 07/05/2015 Massimiliano Pinto Added MAX_EVENT_TYPE_MARIADB10
* 08/06/2015 Massimiliano Pinto Addition of blr_cache_read_master_data()
* 15/06/2015 Massimiliano Pinto Addition of blr_file_get_next_binlogname()
* 23/06/2015 Massimiliano Pinto Addition of blr_file_use_binlog, blr_file_create_binlog
* 29/06/2015 Massimiliano Pinto Addition of blr_file_write_master_config()
* Cache directory is now 'cache' under router->binlogdir
* 05/08/2015 Massimiliano Pinto Initial implementation of transaction safety
* 24/08/2015 Massimiliano Pinto Added strerror_r
* 26/08/2015 Massimiliano Pinto Added MariaDB 10 GTID event check with flags = 0
* This is the current supported condition for detecting
* MariaDB 10 transaction start point.
* It's no longer using QUERY_EVENT with BEGIN
*
* @endverbatim
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <service.h>
#include <server.h>
#include <router.h>
#include <atomic.h>
#include <spinlock.h>
#include <blr.h>
#include <dcb.h>
#include <spinlock.h>
#include <gwdirs.h>
#include <skygw_types.h>
#include <skygw_utils.h>
#include <log_manager.h>
extern int lm_enabled_logfiles_bitmask;
extern size_t log_ses_count[];
extern __thread log_info_t tls_log_info;
static int blr_file_create(ROUTER_INSTANCE *router, char *file);
static void blr_file_append(ROUTER_INSTANCE *router, char *file);
static void blr_log_header(logfile_id_t file, char *msg, uint8_t *ptr);
void blr_cache_read_master_data(ROUTER_INSTANCE *router);
int blr_file_get_next_binlogname(ROUTER_INSTANCE *router);
int blr_file_new_binlog(ROUTER_INSTANCE *router, char *file);
void blr_file_use_binlog(ROUTER_INSTANCE *router, char *file);
int blr_file_write_master_config(ROUTER_INSTANCE *router, char *error);
extern uint32_t extract_field(uint8_t *src, int bits);
static void blr_format_event_size(double *event_size, char *label);
/**
* Initialise the binlog file for this instance. MaxScale will look
* for all the binlogs that it has on local disk, determine the next
* binlog to use and initialise it for writing, determining the
* next record to be fetched from the real master.
*
* @param router The router instance this defines the master for this replication chain
*/
int
blr_file_init(ROUTER_INSTANCE *router)
{
char *ptr;
char path[PATH_MAX+1] = "";
char filename[PATH_MAX+1] = "";
int file_found, n = 1;
int root_len, i;
DIR *dirp;
struct dirent *dp;
if (router->binlogdir == NULL)
{
strncpy(path, get_datadir(), PATH_MAX);
strncat(path,"/",PATH_MAX);
strncat(path, router->service->name,PATH_MAX);
if (access(path, R_OK) == -1)
mkdir(path, 0700);
router->binlogdir = strdup(path);
}
else
{
strncpy(path, router->binlogdir, PATH_MAX);
}
if (access(router->binlogdir, R_OK) == -1)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Unable to read the binlog directory %s.",
router->service->name, router->binlogdir)));
return 0;
}
/* First try to find a binlog file number by reading the directory */
root_len = strlen(router->fileroot);
if ((dirp = opendir(path)) == NULL)
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1]="";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Unable to read the binlog directory %s, %s.",
router->service->name, router->binlogdir,
err_msg)));
return 0;
}
while ((dp = readdir(dirp)) != NULL)
{
if (strncmp(dp->d_name, router->fileroot, root_len) == 0)
{
i = atoi(dp->d_name + root_len + 1);
if (i > n)
n = i;
}
}
closedir(dirp);
file_found = 0;
do {
snprintf(filename,PATH_MAX, "%s/" BINLOG_NAMEFMT, path, router->fileroot, n);
if (access(filename, R_OK) != -1)
{
file_found = 1;
n++;
}
else
file_found = 0;
} while (file_found);
n--;
if (n == 0) // No binlog files found
{
if (router->initbinlog)
snprintf(filename,PATH_MAX, BINLOG_NAMEFMT, router->fileroot,
router->initbinlog);
else
snprintf(filename,PATH_MAX, BINLOG_NAMEFMT, router->fileroot, 1);
if (! blr_file_create(router, filename))
return 0;
}
else
{
snprintf(filename,PATH_MAX, BINLOG_NAMEFMT, router->fileroot, n);
blr_file_append(router, filename);
}
return 1;
}
int
blr_file_rotate(ROUTER_INSTANCE *router, char *file, uint64_t pos)
{
return blr_file_create(router, file);
}
/**
* binlog files need an initial 4 magic bytes at the start. blr_file_add_magic()
* adds them.
*
* @param router The router instance
* @param fd file descriptor to the open binlog file
* @return Nothing
*/
static void
blr_file_add_magic(ROUTER_INSTANCE *router, int fd)
{
unsigned char magic[] = BINLOG_MAGIC;
write(fd, magic, 4);
router->current_pos = 4; /* Initial position after the magic number */
router->binlog_position = 4; /* Initial position after the magic number */
}
/**
* Create a new binlog file for the router to use.
*
* @param router The router instance
* @param file The binlog file name
* @return Non-zero if the fie creation succeeded
*/
static int
blr_file_create(ROUTER_INSTANCE *router, char *file)
{
char path[PATH_MAX + 1] = "";
int fd;
strcpy(path, router->binlogdir);
strcat(path, "/");
strcat(path, file);
if ((fd = open(path, O_RDWR|O_CREAT, 0666)) != -1)
{
blr_file_add_magic(router,fd);
}
else
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Failed to create binlog file %s, %s.",
router->service->name, path, err_msg)));
return 0;
}
fsync(fd);
close(router->binlog_fd);
spinlock_acquire(&router->binlog_lock);
strncpy(router->binlog_name, file, BINLOG_FNAMELEN);
router->binlog_fd = fd;
spinlock_release(&router->binlog_lock);
return 1;
}
/**
* Prepare an existing binlog file to be appened to.
*
* @param router The router instance
* @param file The binlog file name
*/
static void
blr_file_append(ROUTER_INSTANCE *router, char *file)
{
char path[PATH_MAX+1] = "";
int fd;
strcpy(path, router->binlogdir);
strcat(path, "/");
strcat(path, file);
if ((fd = open(path, O_RDWR|O_APPEND, 0666)) == -1)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Failed to open binlog file %s for append.",
path)));
return;
}
fsync(fd);
close(router->binlog_fd);
spinlock_acquire(&router->binlog_lock);
memmove(router->binlog_name, file, BINLOG_FNAMELEN);
router->current_pos = lseek(fd, 0L, SEEK_END);
if (router->current_pos < 4) {
if (router->current_pos == 0) {
blr_file_add_magic(router, fd);
} else {
/* If for any reason the file's length is between 1 and 3 bytes
* then report an error. */
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: binlog file %s has an invalid length %d.",
router->service->name, path, router->current_pos)));
close(fd);
spinlock_release(&router->binlog_lock);
return;
}
}
router->binlog_fd = fd;
spinlock_release(&router->binlog_lock);
}
/**
* Write a binlog entry to disk.
*
* @param router The router instance
* @param buf The binlog record
* @param len The length of the binlog record
* @return Return the number of bytes written
*/
int
blr_write_binlog_record(ROUTER_INSTANCE *router, REP_HEADER *hdr, uint8_t *buf)
{
int n;
if ((n = pwrite(router->binlog_fd, buf, hdr->event_size,
hdr->next_pos - hdr->event_size)) != hdr->event_size)
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Failed to write binlog record at %d of %s, %s. "
"Truncating to previous record.",
router->service->name, hdr->next_pos - hdr->event_size,
router->binlog_name,
err_msg)));
/* Remove any partual event that was written */
ftruncate(router->binlog_fd, hdr->next_pos - hdr->event_size);
return 0;
}
spinlock_acquire(&router->binlog_lock);
router->current_pos = hdr->next_pos;
router->last_written = hdr->next_pos - hdr->event_size;
spinlock_release(&router->binlog_lock);
return n;
}
/**
* Flush the content of the binlog file to disk.
*
* @param router The binlog router
*/
void
blr_file_flush(ROUTER_INSTANCE *router)
{
fsync(router->binlog_fd);
}
/**
* Open a binlog file for reading binlog records
*
* @param router The router instance
* @param binlog The binlog filename
* @return a binlog file record
*/
BLFILE *
blr_open_binlog(ROUTER_INSTANCE *router, char *binlog)
{
char path[PATH_MAX + 1] = "";
BLFILE *file;
spinlock_acquire(&router->fileslock);
file = router->files;
while (file && strcmp(file->binlogname, binlog) != 0)
file = file->next;
if (file)
{
file->refcnt++;
spinlock_release(&router->fileslock);
return file;
}
if ((file = (BLFILE *)calloc(1, sizeof(BLFILE))) == NULL)
{
spinlock_release(&router->fileslock);
return NULL;
}
strncpy(file->binlogname, binlog, BINLOG_FNAMELEN);
file->refcnt = 1;
file->cache = 0;
spinlock_init(&file->lock);
strncpy(path, router->binlogdir, PATH_MAX);
strncat(path, "/", PATH_MAX);
strncat(path, binlog, PATH_MAX);
if ((file->fd = open(path, O_RDONLY, 0666)) == -1)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Failed to open binlog file %s", path)));
free(file);
spinlock_release(&router->fileslock);
return NULL;
}
file->next = router->files;
router->files = file;
spinlock_release(&router->fileslock);
return file;
}
/**
* Read a replication event into a GWBUF structure.
*
* @param router The router instance
* @param file File record
* @param pos Position of binlog record to read
* @param hdr Binlog header to populate
* @return The binlog record wrapped in a GWBUF structure
*/
GWBUF *
blr_read_binlog(ROUTER_INSTANCE *router, BLFILE *file, unsigned long pos, REP_HEADER *hdr)
{
uint8_t hdbuf[BINLOG_EVENT_HDR_LEN];
GWBUF *result;
unsigned char *data;
int n;
unsigned long filelen = 0;
struct stat statb;
memset(&hdbuf, '\0', BINLOG_EVENT_HDR_LEN);
if (!file)
{
return NULL;
}
if (fstat(file->fd, &statb) == 0)
filelen = statb.st_size;
if (pos > filelen)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Attempting to read off the end of the binlog file %s, "
"event at %lu.", file->binlogname, pos)));
return NULL;
}
if (strcmp(router->binlog_name, file->binlogname) == 0 &&
pos >= router->binlog_position)
{
if (pos > router->binlog_position)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Attempting to read off the binlog pos in file %s, "
"event at %lu.", file->binlogname, pos)));
}
return NULL;
}
/* Read the header information from the file */
if ((n = pread(file->fd, hdbuf, BINLOG_EVENT_HDR_LEN, pos)) != BINLOG_EVENT_HDR_LEN)
{
switch (n)
{
case 0:
LOGIF(LD, (skygw_log_write(LOGFILE_DEBUG,
"Reached end of binlog file at %d.",
pos)));
break;
case -1:
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Failed to read binlog file %s at position %d"
" (%s).", file->binlogname,
pos, err_msg)));
if (errno == EBADF)
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Bad file descriptor in read binlog for file %s"
", reference count is %d, descriptor %d.",
file->binlogname, file->refcnt, file->fd)));
break;
}
default:
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Short read when reading the header. "
"Expected 19 bytes but got %d bytes. "
"Binlog file is %s, position %d",
n, file->binlogname, pos)));
break;
}
return NULL;
}
hdr->timestamp = EXTRACT32(hdbuf);
hdr->event_type = hdbuf[4];
hdr->serverid = EXTRACT32(&hdbuf[5]);
hdr->event_size = extract_field(&hdbuf[9], 32);
hdr->next_pos = EXTRACT32(&hdbuf[13]);
hdr->flags = EXTRACT16(&hdbuf[17]);
if (router->mariadb10_compat) {
if (hdr->event_type > MAX_EVENT_TYPE_MARIADB10) {
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Invalid MariaDB 10 event type 0x%x. "
"Binlog file is %s, position %d",
hdr->event_type,
file->binlogname, pos)));
return NULL;
}
} else {
if (hdr->event_type > MAX_EVENT_TYPE) {
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Invalid event type 0x%x. "
"Binlog file is %s, position %d",
hdr->event_type,
file->binlogname, pos)));
return NULL;
}
}
if (hdr->next_pos < pos && hdr->event_type != ROTATE_EVENT)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Next position in header appears to be incorrect "
"rereading event header at pos %lu in file %s, "
"file size is %lu. Master will write %lu in %s next.",
pos, file->binlogname, filelen, router->binlog_position,
router->binlog_name)));
if ((n = pread(file->fd, hdbuf, BINLOG_EVENT_HDR_LEN, pos)) != BINLOG_EVENT_HDR_LEN)
{
switch (n)
{
case 0:
LOGIF(LD, (skygw_log_write(LOGFILE_DEBUG,
"Reached end of binlog file at %d.",
pos)));
break;
case -1:
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Failed to read binlog file %s at position %d"
" (%s).", file->binlogname,
pos, err_msg)));
if (errno == EBADF)
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Bad file descriptor in read binlog for file %s"
", reference count is %d, descriptor %d.",
file->binlogname, file->refcnt, file->fd)));
break;
}
default:
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Short read when reading the header. "
"Expected 19 bytes but got %d bytes. "
"Binlog file is %s, position %d",
file->binlogname, pos, n)));
break;
}
return NULL;
}
hdr->timestamp = EXTRACT32(hdbuf);
hdr->event_type = hdbuf[4];
hdr->serverid = EXTRACT32(&hdbuf[5]);
hdr->event_size = extract_field(&hdbuf[9], 32);
hdr->next_pos = EXTRACT32(&hdbuf[13]);
hdr->flags = EXTRACT16(&hdbuf[17]);
if (hdr->next_pos < pos && hdr->event_type != ROTATE_EVENT)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Next position still incorrect after "
"rereading")));
return NULL;
}
else
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Next position corrected by "
"rereading")));
}
}
if ((result = gwbuf_alloc(hdr->event_size)) == NULL)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Failed to allocate memory for binlog entry, "
"size %d at %d.",
hdr->event_size, pos)));
return NULL;
}
data = GWBUF_DATA(result);
memcpy(data, hdbuf, BINLOG_EVENT_HDR_LEN); // Copy the header in
if ((n = pread(file->fd, &data[BINLOG_EVENT_HDR_LEN], hdr->event_size - BINLOG_EVENT_HDR_LEN, pos + BINLOG_EVENT_HDR_LEN))
!= hdr->event_size - BINLOG_EVENT_HDR_LEN) // Read the balance
{
if (n == -1)
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Error reading the event at %ld in %s. "
"%s, expected %d bytes.",
pos, file->binlogname,
err_msg, hdr->event_size - BINLOG_EVENT_HDR_LEN)));
}
else
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Short read when reading the event at %ld in %s. "
"Expected %d bytes got %d bytes.",
pos, file->binlogname, hdr->event_size - BINLOG_EVENT_HDR_LEN, n)));
if (filelen != 0 && filelen - pos < hdr->event_size)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Binlog event is close to the end of the binlog file, "
"current file size is %u.",
filelen)));
}
blr_log_header(LOGFILE_ERROR, "Possible malformed event header", hdbuf);
}
gwbuf_free(result);
return NULL;
}
return result;
}
/**
* Close a binlog file that has been opened to read binlog records
*
* The open binlog files are shared between multiple slaves that are
* reading the same binlog file.
*
* @param router The router instance
* @param file The file to close
*/
void
blr_close_binlog(ROUTER_INSTANCE *router, BLFILE *file)
{
spinlock_acquire(&file->lock);
file->refcnt--;
if (file->refcnt == 0)
{
spinlock_acquire(&router->fileslock);
if (router->files == file)
router->files = file->next;
else
{
BLFILE *ptr = router->files;
while (ptr && ptr->next != file)
ptr = ptr->next;
if (ptr)
ptr->next = file->next;
}
spinlock_release(&router->fileslock);
close(file->fd);
file->fd = -1;
}
if (file->refcnt == 0) {
spinlock_release(&file->lock);
free(file);
} else {
spinlock_release(&file->lock);
}
}
/**
* Log the event header of binlog event
*
* @param file The log file into which to write the entry
* @param msg A message strign to preceed the header with
* @param ptr The event header raw data
*/
static void
blr_log_header(logfile_id_t file, char *msg, uint8_t *ptr)
{
char buf[400], *bufp;
int i;
bufp = buf;
bufp += sprintf(bufp, "%s: ", msg);
for (i = 0; i < BINLOG_EVENT_HDR_LEN; i++)
bufp += sprintf(bufp, "0x%02x ", ptr[i]);
skygw_log_write_flush(file, "%s", buf);
}
/**
* Return the size of the current binlog file
*
* @param file The binlog file
* @return The current size of the binlog file
*/
unsigned long
blr_file_size(BLFILE *file)
{
struct stat statb;
if (fstat(file->fd, &statb) == 0)
return statb.st_size;
return 0;
}
/**
* Write the response packet to a cache file so that MaxScale can respond
* even if there is no master running when MaxScale starts.
*
* cache dir is 'cache' under router->binlogdir
*
* @param router The instance of the router
* @param response The name of the response, used to name the cached file
* @param buf The buffer to written to the cache
*/
void
blr_cache_response(ROUTER_INSTANCE *router, char *response, GWBUF *buf)
{
char path[PATH_MAX+1] = "";
char *ptr;
int fd;
strncpy(path, router->binlogdir, PATH_MAX);
strncat(path, "/cache", PATH_MAX);
if (access(path, R_OK) == -1) {
int mkdir_ret;
mkdir_ret = mkdir(path, 0700);
}
strncat(path, "/", PATH_MAX);
strncat(path, response, PATH_MAX);
if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
return;
write(fd, GWBUF_DATA(buf), GWBUF_LENGTH(buf));
close(fd);
}
/**
* Read a cached copy of a master response message. This allows
* the router to start and serve any binlogs it already has on disk
* if the master is not available.
*
* cache dir is 'cache' under router->binlogdir
*
* @param router The router instance structure
* @param response The name of the response
* @return A pointer to a GWBUF structure
*/
GWBUF *
blr_cache_read_response(ROUTER_INSTANCE *router, char *response)
{
struct stat statb;
char path[PATH_MAX+1] = "";
char *ptr;
int fd;
GWBUF *buf;
strncpy(path, router->binlogdir, PATH_MAX);
strncat(path, "/cache", PATH_MAX);
strncat(path, "/", PATH_MAX);
strncat(path, response, PATH_MAX);
if ((fd = open(path, O_RDONLY)) == -1)
return NULL;
if (fstat(fd, &statb) != 0)
{
close(fd);
return NULL;
}
if ((buf = gwbuf_alloc(statb.st_size)) == NULL)
{
close(fd);
return NULL;
}
read(fd, GWBUF_DATA(buf), statb.st_size);
close(fd);
return buf;
}
/**
* Does the next binlog file in the sequence for the slave exist.
*
* @param router The router instance
* @param slave The slave in question
* @retuen 0 if the next file does not exist
*/
int
blr_file_next_exists(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
char *sptr, buf[BLRM_BINLOG_NAME_STR_LEN], bigbuf[PATH_MAX + 1];
int filenum;
if ((sptr = strrchr(slave->binlogfile, '.')) == NULL)
return 0;
filenum = atoi(sptr + 1);
sprintf(buf, BINLOG_NAMEFMT, router->fileroot, filenum + 1);
sprintf(bigbuf, "%s/%s", router->binlogdir, buf);
if (access(bigbuf, R_OK) == -1)
return 0;
return 1;
}
/**
* Read all replication events from a binlog file.
*
* Routine detects errors and pending transactions
*
* @param router The router instance
* @param fix Whether to fix or not errors
* @param debug Whether to enable or not the debug for events
* @return 0 on success, >0 on failure
*/
int
blr_read_events_all_events(ROUTER_INSTANCE *router, int fix, int debug) {
unsigned long filelen = 0;
struct stat statb;
uint8_t hdbuf[BINLOG_EVENT_HDR_LEN];
uint8_t *data;
GWBUF *result;
unsigned long long pos = 4;
unsigned long long last_known_commit = 4;
REP_HEADER hdr;
int pending_transaction = 0;
int n;
int db_name_len;
char *statement_sql;
uint8_t *ptr;
int len;
int var_block_len;
int statement_len;
int found_chksum = 0;
int event_error = 0;
unsigned long transaction_events = 0;
unsigned long total_events = 0;
unsigned long total_bytes = 0;
unsigned long n_transactions = 0;
unsigned long max_events = 0;
unsigned long event_bytes = 0;
unsigned long max_bytes = 0;
double average_events = 0;
double average_bytes = 0;
if (router->binlog_fd == -1) {
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Current binlog file %s is not open",
router->binlog_name)));
return 1;
}
if (fstat(router->binlog_fd, &statb) == 0)
filelen = statb.st_size;
router->current_pos = 4;
router->binlog_position = 4;
while (1){
/* Read the header information from the file */
if ((n = pread(router->binlog_fd, hdbuf, BINLOG_EVENT_HDR_LEN, pos)) != BINLOG_EVENT_HDR_LEN) {
switch (n)
{
case 0:
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"End of binlog file [%s] at %llu.",
router->binlog_name,
pos)));
if (n_transactions)
average_events = (double)((double)total_events / (double)n_transactions) * (1.0);
if (n_transactions)
average_bytes = (double)((double)total_bytes / (double)n_transactions) * (1.0);
if (n_transactions != 0) {
char total_label[2]="";
char average_label[2]="";
char max_label[2]="";
double format_total_bytes = total_bytes;
double format_max_bytes = max_bytes;
blr_format_event_size(&format_total_bytes, total_label);
blr_format_event_size(&average_bytes, average_label);
blr_format_event_size(&format_max_bytes, max_label);
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Transaction Summary for binlog '%s'\n"
"\t\t\tDescription %17s%17s%17s\n\t\t\t"
"No. of Transactions %16llu\n\t\t\t"
"No. of Events %16llu %16.1f %16llu\n\t\t\t"
"No. of Bytes %16.1f%s%16.1f%s%16.1f%s", router->binlog_name,
"Total", "Average", "Max",
n_transactions, total_events,
average_events, max_events,
format_total_bytes, total_label, average_bytes, average_label, format_max_bytes, max_label)));
}
if (pending_transaction) {
LOGIF(LT, (skygw_log_write_flush(LOGFILE_TRACE,
"Warning : Binlog file %s contains a previous Opened Transaction"
" @ %llu. This pos is safe for slaves",
router->binlog_name,
last_known_commit)));
}
break;
case -1:
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Failed to read binlog file %s at position %llu"
" (%s).", router->binlog_name,
pos, err_msg)));
if (errno == EBADF)
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Bad file descriptor in read binlog for file %s"
", descriptor %d.",
router->binlog_name, router->binlog_fd)));
break;
}
default:
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Short read when reading the header. "
"Expected 19 bytes but got %d bytes. "
"Binlog file is %s, position %llu",
n, router->binlog_name, pos)));
break;
}
/**
* Check for errors and force last_known_commit position
* and current pos
*/
if (pending_transaction) {
router->binlog_position = last_known_commit;
router->current_pos = pos;
router->pending_transaction = 1;
pending_transaction = 0;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Warning : pending transaction has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
return 0;
} else {
/* any error */
if (n != 0) {
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 1;
} else {
router->binlog_position = pos;
router->current_pos = pos;
return 0;
}
}
}
/* fill replication header struct */
hdr.timestamp = EXTRACT32(hdbuf);
hdr.event_type = hdbuf[4];
hdr.serverid = EXTRACT32(&hdbuf[5]);
hdr.event_size = extract_field(&hdbuf[9], 32);
hdr.next_pos = EXTRACT32(&hdbuf[13]);
hdr.flags = EXTRACT16(&hdbuf[17]);
/* Check event type against MAX_EVENT_TYPE */
if (router->mariadb10_compat) {
if (hdr.event_type > MAX_EVENT_TYPE_MARIADB10) {
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Invalid MariaDB 10 event type 0x%x. "
"Binlog file is %s, position %d",
hdr.event_type,
router->binlog_name, pos)));
event_error = 1;
}
} else {
if (hdr.event_type > MAX_EVENT_TYPE) {
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"Invalid event type 0x%x. "
"Binlog file is %s, position %d",
hdr.event_type,
router->binlog_name, pos)));
event_error = 1;
}
}
if (event_error) {
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found in %s. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_name,
router->binlog_position,
router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 1;
}
if (hdr.event_size <= 0)
{
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Event size error: "
"size %d at %llu.",
hdr.event_size, pos)));
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 1;
}
/* Allocate a GWBUF for the event */
if ((result = gwbuf_alloc(hdr.event_size)) == NULL)
{
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Failed to allocate memory for binlog entry, "
"size %d at %llu.",
hdr.event_size, pos)));
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 1;
}
/* Copy the header in the buffer */
data = GWBUF_DATA(result);
memcpy(data, hdbuf, BINLOG_EVENT_HDR_LEN);// Copy the header in
/* Read event data */
if ((n = pread(router->binlog_fd, &data[BINLOG_EVENT_HDR_LEN], hdr.event_size - BINLOG_EVENT_HDR_LEN, pos + BINLOG_EVENT_HDR_LEN)) != hdr.event_size - BINLOG_EVENT_HDR_LEN)
{
if (n == -1)
{
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Error reading the event at %llu in %s. "
"%s, expected %d bytes.",
pos, router->binlog_name,
err_msg, hdr.event_size - BINLOG_EVENT_HDR_LEN)));
}
else
{
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Short read when reading the event at %llu in %s. "
"Expected %d bytes got %d bytes.",
pos, router->binlog_name, hdr.event_size - BINLOG_EVENT_HDR_LEN, n)));
if (filelen > 0 && filelen - pos < hdr.event_size)
{
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Binlog event is close to the end of the binlog file %s, "
" size is %lu.",
router->binlog_name, filelen)));
}
}
gwbuf_free(result);
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 1;
}
/* check for pending transaction */
if (pending_transaction == 0) {
last_known_commit = pos;
}
/* get event content */
ptr = data+BINLOG_EVENT_HDR_LEN;
/* check for FORMAT DESCRIPTION EVENT */
if(hdr.event_type == FORMAT_DESCRIPTION_EVENT) {
int event_header_length;
int event_header_ntypes;
int n_events;
int check_alg;
uint8_t *checksum;
if(debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"- Format Description event FDE @ %llu, size %lu",
pos, (unsigned long)hdr.event_size)));
event_header_length = ptr[2 + 50 + 4];
event_header_ntypes = hdr.event_size - event_header_length - (2 + 50 + 4 + 1);
if (event_header_ntypes == 168) {
/* mariadb 10 LOG_EVENT_TYPES*/
event_header_ntypes -= 163;
} else {
if (event_header_ntypes == 165) {
/* mariadb 5 LOG_EVENT_TYPES*/
event_header_ntypes -= 160;
} else {
/* mysql 5.6 LOG_EVENT_TYPES = 35 */
event_header_ntypes -= 35;
}
}
n_events = hdr.event_size - event_header_length - (2 + 50 + 4 + 1);
if(debug) {
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
" FDE ServerVersion [%50s]", ptr + 2)));
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
" FDE Header EventLength %i"
", N. of supported MySQL/MariaDB events %i",
event_header_length,
(n_events - event_header_ntypes))));
}
if (event_header_ntypes < n_events) {
checksum = ptr + hdr.event_size - event_header_length - event_header_ntypes;
check_alg = checksum[0];
if(debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
" FDE Checksum alg desc %i, alg type %s",
check_alg,
check_alg == 1 ? "BINLOG_CHECKSUM_ALG_CRC32" : "NONE or UNDEF")));
if (check_alg == 1) {
found_chksum = 1;
} else {
found_chksum = 0;
}
}
}
/* Decode ROTATE EVENT */
if(hdr.event_type == ROTATE_EVENT) {
int len, slen;
uint64_t new_pos;
char file[BINLOG_FNAMELEN+1];
len = hdr.event_size - BINLOG_EVENT_HDR_LEN;
new_pos = extract_field(ptr+4, 32);
new_pos <<= 32;
new_pos |= extract_field(ptr, 32);
slen = len - (8 + 4); // Allow for position and CRC
if (found_chksum == 0)
slen += 4;
if (slen > BINLOG_FNAMELEN)
slen = BINLOG_FNAMELEN;
memcpy(file, ptr + 8, slen);
file[slen] = 0;
if(debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"- Rotate event @ %llu, next file is [%s] @ %llu",
pos, file, new_pos)));
}
/* If MariaDB 10 compatibility:
* check for MARIADB10_GTID_EVENT with flags = 0
* This marks the transaction starts instead of
* QUERY_EVENT with "BEGIN"
*/
if (router->mariadb10_compat) {
if (hdr.event_type == MARIADB10_GTID_EVENT) {
uint64_t n_sequence; /* 8 bytes */
uint32_t domainid; /* 4 bytes */
unsigned int flags; /* 1 byte */
n_sequence = extract_field(ptr, 64);
domainid = extract_field(ptr + 8, 32);
flags = *(ptr + 8 + 4);
if (flags == 0) {
if (pending_transaction > 0) {
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Transaction cannot be @ pos %llu: "
"Another MariaDB 10 transaction (GTID %lu-%lu-%llu)"
" was opened at %llu",
pos, domainid, hdr.serverid, n_sequence, last_known_commit)));
gwbuf_free(result);
break;
} else {
pending_transaction = 1;
transaction_events = 0;
event_bytes = 0;
if (debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"> MariaDB 10 Transaction (GTID %lu-%lu-%llu)"
" starts @ pos %llu",
domainid, hdr.serverid, n_sequence, pos)));
}
}
}
}
/**
* Check QUERY_EVENT
*
* Check for BEGIN ( ONLY for mysql 5.6, mariadb 5.5 )
* Check for COMMIT (not transactional engines)
*/
if(hdr.event_type == QUERY_EVENT) {
char *statement_sql;
db_name_len = ptr[4 + 4];
var_block_len = ptr[4 + 4 + 1 + 2];
statement_len = hdr.event_size - BINLOG_EVENT_HDR_LEN - (4+4+1+2+2+var_block_len+1+db_name_len);
statement_sql = calloc(1, statement_len+1);
strncpy(statement_sql, (char *)ptr+4+4+1+2+2+var_block_len+1+db_name_len, statement_len);
/* A transaction starts with this event */
if (strncmp(statement_sql, "BEGIN", 5) == 0) {
if (pending_transaction > 0) {
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"ERROR: Transaction cannot be @ pos %llu: "
"Another transaction was opened at %llu",
pos, last_known_commit)));
free(statement_sql);
gwbuf_free(result);
break;
} else {
pending_transaction = 1;
transaction_events = 0;
event_bytes = 0;
if (debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"> Transaction starts @ pos %llu", pos)));
}
}
/* Commit received for non transactional tables, i.e. MyISAM */
if (strncmp(statement_sql, "COMMIT", 6) == 0) {
if (pending_transaction > 0) {
pending_transaction = 3;
if (debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
" Transaction @ pos %llu, closing @ %llu", last_known_commit, pos)));
}
}
free(statement_sql);
}
if(hdr.event_type == XID_EVENT) {
/* Commit received for a transactional tables, i.e. InnoDB */
if (pending_transaction > 0) {
pending_transaction = 2;
if (debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
" Transaction XID @ pos %llu, closing @ %llu", last_known_commit, pos)));
}
}
if (pending_transaction > 1) {
if (debug)
LOGIF(LD, (skygw_log_write_flush(LOGFILE_DEBUG,
"< Transaction @ pos %llu, is now closed @ %llu. %lu events seen", last_known_commit, pos, transaction_events)));
pending_transaction = 0;
last_known_commit = pos;
total_events += transaction_events;
if (transaction_events > max_events)
max_events = transaction_events;
n_transactions++;
}
gwbuf_free(result);
/* pos and next_pos sanity checks */
if (hdr.next_pos > 0 && hdr.next_pos < pos) {
LOGIF(LT, (skygw_log_write_flush(LOGFILE_TRACE,
"Binlog %s: next pos %llu < pos %llu, truncating to %llu",
router->binlog_name,
hdr.next_pos,
pos,
pos)));
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 2;
}
if (hdr.next_pos > 0 && hdr.next_pos != (pos + hdr.event_size)) {
LOGIF(LT, (skygw_log_write_flush(LOGFILE_TRACE,
"Binlog %s: next pos %llu != (pos %llu + event_size %llu), truncating to %llu",
router->binlog_name,
hdr.next_pos,
pos,
hdr.event_size,
pos)));
router->binlog_position = last_known_commit;
router->current_pos = pos;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
if (fix) {
if (ftruncate(router->binlog_fd, router->binlog_position) == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,
"Binlog file %s has been truncated at %lu",
router->binlog_name,
router->binlog_position)));
fsync(router->binlog_fd);
}
}
return 2;
}
/* set pos to new value */
if (hdr.next_pos > 0) {
if (pending_transaction) {
total_bytes += hdr.event_size;
event_bytes += hdr.event_size;
if (event_bytes > max_bytes)
max_bytes = event_bytes;
}
pos = hdr.next_pos;
} else {
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"Current event type %lu @ %llu has nex pos = %llu : exiting", hdr.event_type, pos, hdr.next_pos)));
break;
}
transaction_events++;
}
if (pending_transaction) {
LOGIF(LT, (skygw_log_write_flush(LOGFILE_TRACE,
"Binlog %s contains an Open Transaction, truncating to %llu",
router->binlog_name,
last_known_commit)));
router->binlog_position = last_known_commit;
router->current_pos = pos;
router->pending_transaction = 1;
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,
"warning : an error has been found. "
"Setting safe pos to %lu, current pos %lu",
router->binlog_position, router->current_pos)));
return 0;
} else {
router->binlog_position = pos;
router->current_pos = pos;
return 0;
}
}
/**
* Format a number to G, M, k, or B size
*
* @param event_size The number to format
* @param label Label to use for display the formattted number
*/
static void
blr_format_event_size(double *event_size, char *label)
{
if (*event_size > (1024 * 1024 * 1024)) {
*event_size = *event_size / (1024 * 1024 * 1024);
label[0] = 'G';
} else if (*event_size > (1024 * 1024)) {
*event_size = *event_size / (1024 * 1024);
label[0] = 'M';
} else if (*event_size > 1024) {
*event_size = *event_size / (1024);
label[0] = 'k';
} else
label[0] = 'B';
}
/**
* Read any previously saved master data
*
* @param router The router instance
*/
void
blr_cache_read_master_data(ROUTER_INSTANCE *router)
{
router->saved_master.server_id = blr_cache_read_response(router, "serverid");
router->saved_master.heartbeat = blr_cache_read_response(router, "heartbeat");
router->saved_master.chksum1 = blr_cache_read_response(router, "chksum1");
router->saved_master.chksum2 = blr_cache_read_response(router, "chksum2");
router->saved_master.gtid_mode = blr_cache_read_response(router, "gtidmode");
router->saved_master.uuid = blr_cache_read_response(router, "uuid");
router->saved_master.setslaveuuid = blr_cache_read_response(router, "ssuuid");
router->saved_master.setnames = blr_cache_read_response(router, "setnames");
router->saved_master.utf8 = blr_cache_read_response(router, "utf8");
router->saved_master.select1 = blr_cache_read_response(router, "select1");
router->saved_master.selectver = blr_cache_read_response(router, "selectver");
router->saved_master.selectvercom = blr_cache_read_response(router, "selectvercom");
router->saved_master.selecthostname = blr_cache_read_response(router, "selecthostname");
router->saved_master.map = blr_cache_read_response(router, "map");
router->saved_master.mariadb10 = blr_cache_read_response(router, "mariadb10");
}
/**
* Get the next binlog file name.
*
* @param router The router instance
* @return 0 on error, >0 as sequence number
*/
int
blr_file_get_next_binlogname(ROUTER_INSTANCE *router)
{
char *sptr;
int filenum;
if ((sptr = strrchr(router->binlog_name, '.')) == NULL)
return 0;
filenum = atoi(sptr+1);
if (filenum)
filenum++;
return filenum;
}
/**
* Create a new binlog file
*
* @param router The router instance
* @param file The new binlog file
* @return 1 on success, 0 on failure
*/
int
blr_file_new_binlog(ROUTER_INSTANCE *router, char *file)
{
return blr_file_create(router, file);
}
/**
* Use current binlog file
* @param router The router instance
* @param file The binlog file
*/
void
blr_file_use_binlog(ROUTER_INSTANCE *router, char *file)
{
return blr_file_append(router, file);
}
/**
* Write a new ini file with master configuration
*
* File is 'inst->binlogdir/master.ini.tmp'
* When done it's renamed to 'inst->binlogdir/master.ini'
*
* @param router The current router instance
* @param error Preallocated error message
* @return 0 on success, >0 on failure
*
*/
int
blr_file_write_master_config(ROUTER_INSTANCE *router, char *error) {
char *section = "binlog_configuration";
FILE *config_file;
int rc;
char path[(PATH_MAX - 15) + 1] = "";
char filename[(PATH_MAX - 4) + 1] = "";
char tmp_file[PATH_MAX + 1] = "";
char err_msg[BLRM_STRERROR_R_MSG_SIZE+1] = "";
strncpy(path, router->binlogdir, (PATH_MAX - 15));
snprintf(filename,(PATH_MAX - 4), "%s/master.ini", path);
snprintf(tmp_file, (PATH_MAX -4), filename);
strcat(tmp_file, ".tmp");
/* open file for writing */
config_file = fopen(tmp_file,"wb");
if (config_file == NULL) {
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
snprintf(error, BINLOG_ERROR_MSG_LEN, "%s, errno %u", err_msg, errno);
return 2;
}
if(chmod(tmp_file, S_IRUSR | S_IWUSR) < 0) {
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
snprintf(error, BINLOG_ERROR_MSG_LEN, "%s, errno %u", err_msg, errno);
return 2;
}
/* write ini file section */
fprintf(config_file,"[%s]\n", section);
/* write ini file key=value */
fprintf(config_file,"master_host=%s\n", router->service->dbref->server->name);
fprintf(config_file,"master_port=%d\n", router->service->dbref->server->port);
fprintf(config_file,"master_user=%s\n", router->user);
fprintf(config_file,"master_password=%s\n", router->password);
fprintf(config_file,"filestem=%s\n", router->fileroot);
fclose(config_file);
/* rename tmp file to right filename */
rc = rename(tmp_file, filename);
if (rc == -1) {
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
snprintf(error, BINLOG_ERROR_MSG_LEN, "%s, errno %u", err_msg, errno);
return 3;
}
if(chmod(filename, S_IRUSR | S_IWUSR) < 0) {
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
snprintf(error, BINLOG_ERROR_MSG_LEN, "%s, errno %u", err_msg, errno);
return 3;
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink