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/* Synchronous socket and file I/O operations useful across the core.
*
* Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* 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 Redis 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 "redis.h"
/* ----------------- Blocking sockets I/O with timeouts --------------------- */
/* Redis performs most of the I/O in a nonblocking way, with the exception
* of the SYNC command where the slave does it in a blocking way, and
* the MIGRATE command that must be blocking in order to be atomic from the
* point of view of the two instances (one migrating the key and one receiving
* the key). This is why need the following blocking I/O functions. */
int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nwritten, ret = size;
time_t start = time(NULL);
timeout++;
while(size) {
if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
nwritten = write(fd,ptr,size);
if (nwritten == -1) return -1;
ptr += nwritten;
size -= nwritten;
}
if ((time(NULL)-start) > timeout) {
errno = ETIMEDOUT;
return -1;
}
}
return ret;
}
int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nread, totread = 0;
time_t start = time(NULL);
timeout++;
while(size) {
if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
nread = read(fd,ptr,size);
if (nread <= 0) return -1;
ptr += nread;
size -= nread;
totread += nread;
}
if ((time(NULL)-start) > timeout) {
errno = ETIMEDOUT;
return -1;
}
}
return totread;
}
int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nread = 0;
size--;
while(size) {
char c;
if (syncRead(fd,&c,1,timeout) == -1) return -1;
if (c == '\n') {
*ptr = '\0';
if (nread && *(ptr-1) == '\r') *(ptr-1) = '\0';
return nread;
} else {
*ptr++ = c;
*ptr = '\0';
nread++;
}
}
return nread;
}
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