diff options
Diffstat (limited to 'libio/fileops.c')
| -rw-r--r-- | libio/fileops.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/libio/fileops.c b/libio/fileops.c index be65d42fb2..8930f6f3cd 100644 --- a/libio/fileops.c +++ b/libio/fileops.c @@ -567,7 +567,7 @@ _IO_new_file_seekoff (fp, offset, dir, mode) _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); { _IO_mask_flags (fp, 0, _IO_EOF_SEEN); - return offset; + goto resync; } } #ifdef TODO @@ -579,7 +579,7 @@ _IO_new_file_seekoff (fp, offset, dir, mode) if (ignore (to_skip) != to_skip) goto dumb; _IO_mask_flags (fp, 0, _IO_EOF_SEEN); - return offset; + goto resync; } #endif } @@ -590,7 +590,7 @@ _IO_new_file_seekoff (fp, offset, dir, mode) _IO_switch_to_backup_area (fp); gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); _IO_mask_flags (fp, 0, _IO_EOF_SEEN); - return offset; + goto resync; } #endif } @@ -646,6 +646,16 @@ _IO_new_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->_offset >= 0) + _IO_SYSSEEK (fp, fp->_offset, 0); + + return offset; } _IO_ssize_t |