57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* Implementation of the _dl_write function. Generic version.
|
|
Copyright (C) 2020-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <ldsodefs.h>
|
|
#include <libc-lock.h>
|
|
#include <sys/uio.h>
|
|
|
|
ssize_t
|
|
_dl_write (int fd, const void *buffer, size_t length)
|
|
{
|
|
struct iovec iov = { .iov_base = (void *) buffer, .iov_len = length };
|
|
ssize_t ret;
|
|
|
|
#if RTLD_PRIVATE_ERRNO
|
|
/* We have to take this lock just to be sure we don't clobber the private
|
|
errno when it's being used by another thread that cares about it.
|
|
Yet we must be sure not to try calling the lock functions before
|
|
the thread library is fully initialized. */
|
|
if (__glibc_unlikely (_dl_starting_up))
|
|
{
|
|
ret = __writev (fd, &iov, 1);
|
|
if (ret < 0)
|
|
ret = -errno;
|
|
}
|
|
else
|
|
{
|
|
__rtld_lock_lock_recursive (GL(dl_load_lock));
|
|
ret = __writev (fd, &iov, 1);
|
|
if (ret < 0)
|
|
ret = -errno;
|
|
__rtld_lock_unlock_recursive (GL(dl_load_lock));
|
|
}
|
|
#else
|
|
ret = __writev (fd, &iov, 1);
|
|
if (ret < 0)
|
|
ret = -errno;
|
|
#endif
|
|
|
|
return ret;
|
|
}
|