diff options
| -rw-r--r-- | glnx-fdio.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/glnx-fdio.c b/glnx-fdio.c index ee69aa1..b1af679 100644 --- a/glnx-fdio.c +++ b/glnx-fdio.c @@ -794,10 +794,21 @@ glnx_regfile_copy_bytes (int fdf, int fdt, off_t max_bytes) /* If we've requested to copy the whole range, try a full-file clone first. */ - if (max_bytes == (off_t) -1) + if (max_bytes == (off_t) -1 && + lseek (fdf, 0, SEEK_CUR) == 0 && + lseek (fdt, 0, SEEK_CUR) == 0) { if (ioctl (fdt, FICLONE, fdf) == 0) - return 0; + { + /* All the other methods advance the fds. Do it here too for consistency. */ + if (lseek (fdf, 0, SEEK_END) < 0) + return -1; + if (lseek (fdt, 0, SEEK_END) < 0) + return -1; + + return 0; + } + /* Fall through */ struct stat stbuf; |