diff options
Diffstat (limited to 'libio/oldfileops.c')
| -rw-r--r-- | libio/oldfileops.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/libio/oldfileops.c b/libio/oldfileops.c index 59de8d8818..e0f8e65255 100644 --- a/libio/oldfileops.c +++ b/libio/oldfileops.c @@ -514,7 +514,7 @@ _IO_old_file_seekoff (fp, offset, dir, mode) _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, fp->_IO_read_end); _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); - return offset; + goto resync; } #ifdef TODO /* If we have streammarkers, seek forward by reading ahead. */ @@ -524,7 +524,7 @@ _IO_old_file_seekoff (fp, offset, dir, mode) - (fp->_IO_read_ptr - fp->_IO_read_base); if (ignore (to_skip) != to_skip) goto dumb; - return offset; + goto resync; } #endif } @@ -534,7 +534,7 @@ _IO_old_file_seekoff (fp, offset, dir, mode) if (!_IO_in_backup (fp)) _IO_switch_to_backup_area (fp); gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); - return offset; + goto resync; } #endif } @@ -590,6 +590,16 @@ _IO_old_file_seekoff (fp, offset, dir, mode) _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); } return result; + +resync: + /* We need to do it since it is possible that the file offset in + the kernel may be changed behind our back. It may happen when + we fopen a file and then do a fork. One process may access the + the file and the kernel file offset will be changed. */ + if (fp->_old_offset >= 0) + _IO_SYSSEEK (fp, fp->_old_offset, 0); + + return offset; } _IO_ssize_t |