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Add comment to explain why O_EXCL and O_TRUNC can be ignored in

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openFlagsToCreateFileFlags() in certain cases.
This commit is contained in:
Bruce Momjian 2007-02-13 02:06:22 +00:00
parent d1d3f4d015
commit 849b070707
1 changed files with 4 additions and 1 deletions
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5
src/port/open.c
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@ -6,7 +6,7 @@
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/port/open.c,v 1.18 2007/01/05 22:20:02 momjian Exp $
* $PostgreSQL: pgsql/src/port/open.c,v 1.19 2007/02/13 02:06:22 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -25,6 +25,7 @@ openFlagsToCreateFileFlags(int openFlags)
{
switch (openFlags & (O_CREAT | O_TRUNC | O_EXCL))
{
/* O_EXCL is meaningless without O_CREAT */
case 0:
case O_EXCL:
return OPEN_EXISTING;
@ -32,6 +33,7 @@ openFlagsToCreateFileFlags(int openFlags)
case O_CREAT:
return OPEN_ALWAYS;
/* O_EXCL is meaningless without O_CREAT */
case O_TRUNC:
case O_TRUNC | O_EXCL:
return TRUNCATE_EXISTING;
@ -39,6 +41,7 @@ openFlagsToCreateFileFlags(int openFlags)
case O_CREAT | O_TRUNC:
return CREATE_ALWAYS;
/* O_TRUNC is meaningless with O_CREAT */
case O_CREAT | O_EXCL:
case O_CREAT | O_TRUNC | O_EXCL:
return CREATE_NEW;