greenplumn noblock 源码
greenplumn noblock 代码
文件路径：/src/port/noblock.c
/*-------------------------------------------------------------------------
*
* noblock.c
* set a file descriptor as blocking or non-blocking
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/port/noblock.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include <fcntl.h>
/*
* Put socket into nonblock mode.
* Returns true on success, false on failure.
*/
bool
pg_set_noblock(pgsocket sock)
{
#if !defined(WIN32)
int flags;
flags = fcntl(sock, F_GETFL);
if (flags < 0)
return false;
if (fcntl(sock, F_SETFL, (flags | O_NONBLOCK)) == -1)
return false;
return true;
#else
unsigned long ioctlsocket_ret = 1;
/* Returns non-0 on failure, while fcntl() returns -1 on failure */
return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
#endif
}
/*
* Put socket into blocking mode.
* Returns true on success, false on failure.
*/
bool
pg_set_block(pgsocket sock)
{
#if !defined(WIN32)
int flags;
flags = fcntl(sock, F_GETFL);
if (flags < 0)
return false;
if (fcntl(sock, F_SETFL, (flags & ~O_NONBLOCK)) == -1)
return false;
return true;
#else
unsigned long ioctlsocket_ret = 0;
/* Returns non-0 on failure, while fcntl() returns -1 on failure */
return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
#endif
}
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