mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-15 19:09:58 +08:00
656df313e0
changes of flags and fp lock. * libc/stdio/freopen.c: Ditto. * libc/stdio/freopen64.c: Ditto. * libc/stdio/fgetc.c: Revert change from 2009-04-24, remove sfp locks which guard entire function to avoid potential deadlocks when using stdio functions in multiple thraeds. * libc/stdio/fgets.c: Ditto. * libc/stdio/fgetwc.c: Ditto. * libc/stdio/fgetws.c: Ditto. * libc/stdio/fread.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/getc.c: Ditto. * libc/stdio/getdelim.c: Ditto. * libc/stdio/gets.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vfwscanf.c: Ditto. * libc/stdio/fflush.c (_fflush_r): Split out core functionality into new function __sflush_r. Just lock file and call __sflush_r from here. * libc/stdio/fwalk.c (_fwalk): Remove static helper function and move functionality back into main function. Don't walk a file with flags value of 1. Add comment. (_fwalk_reent): Ditto. * libc/stdio/local.h (__sflush_r): Declare. * libc/stdio/refill.c (__srefill): Before calling fwalk, set flags value to 1 so this file pointer isn't walked. Revert flags afterwards and call __sflush_r for this fp if necessary. Add comments.
116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<getc>>---read a character (macro)
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INDEX
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getc
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INDEX
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_getc_r
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ANSI_SYNOPSIS
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#include <stdio.h>
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int getc(FILE *<[fp]>);
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#include <stdio.h>
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int _getc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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int getc(<[fp]>)
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FILE *<[fp]>;
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#include <stdio.h>
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int _getc_r(<[ptr]>, <[fp]>)
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struct _reent *<[ptr]>;
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FILE *<[fp]>;
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DESCRIPTION
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<<getc>> is a macro, defined in <<stdio.h>>. You can use <<getc>>
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to get the next single character from the file or stream
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identified by <[fp]>. As a side effect, <<getc>> advances the file's
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current position indicator.
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For a subroutine version of this macro, see <<fgetc>>.
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The <<_getc_r>> function is simply the reentrant version of <<getc>>
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which passes an additional reentrancy structure pointer argument: <[ptr]>.
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RETURNS
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The next character (read as an <<unsigned char>>, and cast to
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<<int>>), unless there is no more data, or the host system reports a
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read error; in either of these situations, <<getc>> returns <<EOF>>.
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You can distinguish the two situations that cause an <<EOF>> result by
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using the <<ferror>> and <<feof>> functions.
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PORTABILITY
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ANSI C requires <<getc>>; it suggests, but does not require, that
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<<getc>> be implemented as a macro. The standard explicitly permits
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macro implementations of <<getc>> to use the argument more than once;
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therefore, in a portable program, you should not use an expression
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with side effects as the <<getc>> argument.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Berkeley) %G%";
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#endif /* LIBC_SCCS and not lint */
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#include <_ansi.h>
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#include <stdio.h>
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#include "local.h"
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/*
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* A subroutine version of the macro getc.
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*/
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#undef getc
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int
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_DEFUN(_getc_r, (ptr, fp),
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struct _reent *ptr _AND
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register FILE *fp)
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{
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int result;
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CHECK_INIT (ptr, fp);
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_flockfile (fp);
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result = __sgetc_r (ptr, fp);
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_funlockfile (fp);
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return result;
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}
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#ifndef _REENT_ONLY
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int
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_DEFUN(getc, (fp),
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register FILE *fp)
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{
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int result;
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CHECK_INIT (_REENT, fp);
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_flockfile (fp);
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result = __sgetc_r (_REENT, fp);
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_funlockfile (fp);
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return result;
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}
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#endif /* !_REENT_ONLY */
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