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/*
ctdb logging code
Copyright (C) Andrew Tridgell 2008
This program 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; either version 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "system/network.h"
#include "system/time.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/util/dlinklist.h"
#include "lib/util/debug.h"
#include "lib/util/blocking.h"
#include "lib/util/sys_rw.h"
#include "lib/util/time.h"
#include "ctdb_private.h"
#include "ctdb_client.h"
#include "common/common.h"
#include "common/logging.h"
struct ctdb_log_state {
const char *prefix;
int fd, pfd;
char buf[1024];
uint16_t buf_used;
void (*logfn)(const char *, uint16_t, void *);
void *logfn_private;
};
/* Used by ctdb_set_child_logging() */
static struct ctdb_log_state *log_state;
/* Initialise logging */
bool ctdb_logging_init(TALLOC_CTX *mem_ctx, const char *logging,
const char *debug_level)
{
int ret;
log_state = talloc_zero(mem_ctx, struct ctdb_log_state);
if (log_state == NULL) {
return false;
}
ret = logging_init(mem_ctx, logging, debug_level, "ctdbd");
if (ret != 0) {
return false;
}
return true;
}
/* Note that do_debug always uses the global log state. */
static void write_to_log(struct ctdb_log_state *log,
const char *buf, unsigned int len)
{
if (script_log_level <= DEBUGLEVEL) {
if (log != NULL && log->prefix != NULL) {
dbgtext("%s: %*.*s\n", log->prefix, len, len, buf);
} else {
dbgtext("%*.*s\n", len, len, buf);
}
/* log it in the eventsystem as well */
if (log && log->logfn) {
log->logfn(log->buf, len, log->logfn_private);
}
}
}
/*
called when log data comes in from a child process
*/
static void ctdb_child_log_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private)
{
struct ctdb_log_state *log = talloc_get_type(private, struct ctdb_log_state);
char *p;
int n;
if (!(flags & TEVENT_FD_READ)) {
return;
}
n = sys_read(log->pfd, &log->buf[log->buf_used],
sizeof(log->buf) - log->buf_used);
if (n > 0) {
log->buf_used += n;
} else if (n == 0) {
if (log != log_state) {
talloc_free(log);
}
return;
}
while (log->buf_used > 0 &&
(p = memchr(log->buf, '\n', log->buf_used)) != NULL) {
int n1 = (p - log->buf)+1;
int n2 = n1 - 1;
/* swallow \r from child processes */
if (n2 > 0 && log->buf[n2-1] == '\r') {
n2--;
}
write_to_log(log, log->buf, n2);
memmove(log->buf, p+1, sizeof(log->buf) - n1);
log->buf_used -= n1;
}
/* the buffer could have completely filled - unfortunately we have
no choice but to dump it out straight away */
if (log->buf_used == sizeof(log->buf)) {
write_to_log(log, log->buf, log->buf_used);
log->buf_used = 0;
}
}
/*
setup for logging of child process stdout
*/
int ctdb_set_child_logging(struct ctdb_context *ctdb)
{
int p[2];
int old_stdout, old_stderr;
struct tevent_fd *fde;
/* setup a pipe to catch IO from subprocesses */
if (pipe(p) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to setup for child logging pipe\n"));
return -1;
}
/* We'll fail if stderr/stdout not already open; it's simpler. */
old_stdout = dup(STDOUT_FILENO);
if (old_stdout < 0) {
DEBUG(DEBUG_ERR, ("Failed to dup stdout for child logging\n"));
return -1;
}
old_stderr = dup(STDERR_FILENO);
if (old_stderr < 0) {
DEBUG(DEBUG_ERR, ("Failed to dup stderr for child logging\n"));
close(old_stdout);
return -1;
}
if (dup2(p[1], STDOUT_FILENO) < 0 || dup2(p[1], STDERR_FILENO) < 0) {
int saved_errno = errno;
dup2(old_stdout, STDOUT_FILENO);
dup2(old_stderr, STDERR_FILENO);
close(old_stdout);
close(old_stderr);
close(p[0]);
close(p[1]);
errno = saved_errno;
printf(__location__ " dup2 failed: %s\n",
strerror(errno));
return -1;
}
close(p[1]);
close(old_stdout);
close(old_stderr);
fde = tevent_add_fd(ctdb->ev, log_state, p[0], TEVENT_FD_READ,
ctdb_child_log_handler, log_state);
tevent_fd_set_auto_close(fde);
log_state->pfd = p[0];
DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d for logging\n", p[0]));
return 0;
}
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