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