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|
/* -*-pgsql-c-*- */
/*
* pgpool: a language independent connection pool server for PostgreSQL
* written by Tatsuo Ishii
*
* Copyright (c) 2003-2019 PgPool Global Development Group
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of the
* author not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. The author makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* pool_stream.c: stream I/O modules
*
*/
#include "config.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "pool.h"
#include "utils/socket_stream.h"
#ifndef POOL_PRIVATE
#include "utils/elog.h"
#else
#include "utils/fe_ports.h"
#endif
/*
* set non-block flag
*/
void
socket_set_nonblock(int fd)
{
int var;
/* set fd to none blocking */
var = fcntl(fd, F_GETFL, 0);
if (var == -1)
{
ereport(FATAL,
(errmsg("unable to set options on socket"),
errdetail("fcntl system call failed with error \"%m\"")));
}
if (fcntl(fd, F_SETFL, var | O_NONBLOCK) == -1)
{
ereport(FATAL,
(errmsg("unable to set options on socket"),
errdetail("fcntl system call failed with error \"%m\"")));
}
}
/*
* unset non-block flag
*/
void
socket_unset_nonblock(int fd)
{
int var;
/* set fd to none blocking */
var = fcntl(fd, F_GETFL, 0);
if (var == -1)
{
ereport(FATAL,
(errmsg("unable to set options on socket"),
errdetail("fcntl system call failed with error \"%m\"")));
}
if (fcntl(fd, F_SETFL, var & ~O_NONBLOCK) == -1)
{
ereport(FATAL,
(errmsg("unable to set options on socket"),
errdetail("fcntl system call failed with error \"%m\"")));
}
}
#ifdef DEBUG
/*
* Debug aid
*/
static void
dump_buffer(char *buf, int len)
{
if (!message_level_is_interesting(DEBUG5))
return;
while (--len)
{
ereport(DEBUG5,
(errmsg("%02x", *buf++)));
}
}
#endif
int
socket_write(int fd, void *buf, size_t len)
{
int bytes_send = 0;
do
{
int ret;
ret = write(fd, buf + bytes_send, (len - bytes_send));
if (ret <= 0)
{
if (errno == EINTR || errno == EAGAIN)
{
ereport(DEBUG5,
(errmsg("write on socket failed with error :\"%m\""),
errdetail("retrying...")));
continue;
}
ereport(LOG,
(errmsg("write on socket failed"),
errdetail("%m")));
return -1;
}
bytes_send += ret;
} while (bytes_send < len);
return bytes_send;
}
int
socket_read(int fd, void *buf, size_t len, int timeout)
{
int ret,
read_len;
read_len = 0;
struct timeval timeoutval;
fd_set readmask;
int fds;
while (read_len < len)
{
FD_ZERO(&readmask);
FD_SET(fd, &readmask);
timeoutval.tv_sec = timeout;
timeoutval.tv_usec = 0;
fds = select(fd + 1, &readmask, NULL, NULL, timeout ? &timeoutval : NULL);
if (fds == -1)
{
if (errno == EAGAIN || errno == EINTR)
continue;
ereport(WARNING,
(errmsg("system call select() failed"),
errdetail("%m")));
return -1;
}
else if (fds == 0)
{
return -2;
}
ret = read(fd, buf + read_len, (len - read_len));
if (ret < 0)
{
if (errno == EINTR || errno == EAGAIN)
{
ereport(DEBUG5,
(errmsg("read from socket failed with error :\"%m\""),
errdetail("retrying...")));
continue;
}
ereport(LOG,
(errmsg("read from socket failed with error :\"%m\"")));
return -1;
}
if (ret == 0)
{
ereport(LOG,
(errmsg("read from socket failed, remote end closed the connection")));
return 0;
}
read_len += ret;
}
return read_len;
}
|
