noblock.c

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/*-------------------------------------------------------------------------
 *
 * noblock.c
 *    set a file descriptor as non-blocking
 *
 * Portions Copyright (c) 1996-2013, 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>


bool
pg_set_noblock(pgsocket sock)
{
#if !defined(WIN32)
    return (fcntl(sock, F_SETFL, O_NONBLOCK) != -1);
#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
}


bool
pg_set_block(pgsocket sock)
{
#if !defined(WIN32)
    int         flags;

    flags = fcntl(sock, F_GETFL);
    if (flags < 0 || fcntl(sock, F_SETFL, (long) (flags & ~O_NONBLOCK)))
        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
}