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On Dec 1 17:02, Xiaofeng Liu via cygwin wrote: > In ftello.c, it intentionally skipped fflush for read mode: > https://github.com/openunix/cygwin/blob/master/newlib/libc/stdio/ftello.c#L121 > > /* Find offset of underlying I/O object, then adjust for buffered bytes. Flush a write stream, since the offset may be altered if the stream is appending. Do not flush a read stream, since we must not lose the ungetc buffer. */ if (fp->_flags & __SWR) _fflush_r (ptr, fp); > But in fseeko.c, when fseek(..., SEEK_CUR) requires to get the current position first. But it calls _fflush_r(ptr, fp) in read mode, which screwed up the current position after fflush. > https://github.com/openunix/cygwin/blob/master/newlib/libc/stdio/fseeko.c#L174 > > > For my job, if I skip _fflush_r for read only mode in fseek(..., SEEK_CUR), the job runs OK. > Considering fseek(..., SEEK_CUR) is a basic call, could my understanding be wrong? Please provide a simple, self-contained testcase. It might clear up the problem. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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