/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org> * * GNU Library General Public License (LGPL) version 2 or later. * * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details. */ #include "_stdio.h" #ifndef __DO_LARGEFILE # define FILEDES_ARG (-1) #endif FILE *freopen(const char * __restrict filename, const char * __restrict mode, register FILE * __restrict stream) { /* * ANSI/ISO allow (implementation-defined) change of mode for an * existing file if filename is NULL. It doesn't look like Linux * supports this, so we don't here. * * NOTE: Whether or not the stream is free'd on failure is unclear * w.r.t. ANSI/ISO. This implementation chooses to NOT free * the stream and associated buffer if they were dynamically * allocated. * NOTE: Previous versions of uClibc did free dynamic storage. * * TODO: Apparently linux allows setting append mode. Implement? */ unsigned short dynmode; register FILE *fp; __STDIO_AUTO_THREADLOCK_VAR; __STDIO_AUTO_THREADLOCK(stream); __STDIO_STREAM_VALIDATE(stream); __STDIO_OPENLIST_INC_USE; /* Do not remove the file from the list. */ /* First, flush and close, but don't deallocate, the stream. */ /* This also removes the stream for the open file list. */ dynmode = (stream->__modeflags & (__FLAG_FREEBUF|__FLAG_FREEFILE)); stream->__modeflags &= ~(__FLAG_FREEBUF|__FLAG_FREEFILE); /* Only call fclose on the stream if it is not already closed. */ if ((stream->__modeflags & (__FLAG_READONLY|__FLAG_WRITEONLY)) != (__FLAG_READONLY|__FLAG_WRITEONLY) ) { fclose(stream); /* Failures are ignored. */ /* NOTE: fclose always does __STDIO_OPENLIST_INC_DEL_CNT. But we don't * want to remove this FILE from the open list, even if the freopen fails. * Consider the case of a failed freopen() on stdin. You probably still * want to be able to call freopen() again. Similarly for other "malloc'd" * streams. */ __STDIO_OPENLIST_DEC_DEL_CNT; } fp = _stdio_fopen(((intptr_t) filename), mode, stream, FILEDES_ARG); if (!fp) { /* Don't remove stream from the open file list and (potentially) free it. * See _stdio_openlist_dec_use() in fflush.c. */ stream->__modeflags = __FLAG_READONLY|__FLAG_WRITEONLY|__FLAG_FAILED_FREOPEN; } /* Reset the allocation flags. */ stream->__modeflags |= dynmode; __STDIO_OPENLIST_DEC_USE; __STDIO_AUTO_THREADUNLOCK(stream); return fp; }