diff options
Diffstat (limited to 'REORG.TODO/hurd/fd-read.c')
-rw-r--r-- | REORG.TODO/hurd/fd-read.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/fd-read.c b/REORG.TODO/hurd/fd-read.c new file mode 100644 index 0000000000..361b96f969 --- /dev/null +++ b/REORG.TODO/hurd/fd-read.c @@ -0,0 +1,54 @@ +/* Copyright (C) 1993-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <unistd.h> +#include <hurd.h> +#include <hurd/fd.h> +#include <string.h> + +error_t +_hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, loff_t offset) +{ + error_t err; + char *data; + mach_msg_type_number_t nread; + + error_t readfd (io_t port) + { + return __io_read (port, &data, &nread, offset, *nbytes); + } + + data = buf; + nread = *nbytes; + if (err = HURD_FD_PORT_USE (fd, _hurd_ctty_input (port, ctty, readfd))) + return err; + + if (data != buf) + { + if (nread > *nbytes) /* Sanity check for bogus server. */ + { + __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); + return EGRATUITOUS; + } + memcpy (buf, data, nread); + __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread); + } + + *nbytes = nread; + return 0; +} |