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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1999-2002
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: os_errno.c,v 11.8 2002/01/11 15:52:59 bostic Exp $";
#endif /* not lint */
#include "db_int.h"
/*
* __os_get_errno_ret_zero --
* Return the value of errno, even if it's zero.
*
* PUBLIC: int __os_get_errno_ret_zero __P((void));
*/
int
__os_get_errno_ret_zero()
{
/* This routine must be able to return the same value repeatedly. */
return (errno);
}
/*
* __os_get_errno --
* Return the value of errno, or EAGAIN if errno is zero.
*
* PUBLIC: int __os_get_errno __P((void));
*/
int
__os_get_errno()
{
/*
* This routine must be able to return the same value repeatedly.
*
* We've seen cases where system calls failed but errno was never set.
* This version of __os_get_errno() sets errno to EAGAIN if it's not
* already set, to work around that problem. For obvious reasons, we
* can only call this function if we know an error has occurred, that
* is, we can't test errno for a non-zero value after this call.
*/
if (errno == 0)
__os_set_errno(EAGAIN);
return (errno);
}
/*
* __os_set_errno --
* Set the value of errno.
*
* PUBLIC: void __os_set_errno __P((int));
*/
void
__os_set_errno(evalue)
int evalue;
{
errno = evalue;
}
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