bug in function ngx_write_file?

lu wenbin luwenbin84 at gmail.com
Wed Jun 30 07:26:46 MSD 2010

        I read the code in src/os/ngx_files.c, function ngx_write_file, but
get a little confused
       * for ( ;; ) {
        n = pwrite(file->fd, buf, size, offset);

        if (n == -1) {
            ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
                          "pwrite() \"%s\" failed", file->name.data);
            return NGX_ERROR;

        file->offset += n;
        written += n;

        if ((size_t) n == size) {
            return written;

        offset += n;
        size -= n;
  *   the code seems want to write all content in buf to file(file->fd), but
I think *n = pwrite(file->fd, buf, size, offset) *should be changed to* **n
= pwrite(file->fd, buf+written, size, offset);
     man pwrite:
     **pwrite() writes up to count bytes from the buffer starting  at  buf
to the  file  descriptor  fd  at  offset  offset.   The file offset is not

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