mcst-linux-kernel/glibc-2.35/stdio-common/flockfile.c

60 lines
2.3 KiB
C

/* Lock I/O stream. Singlethreaded version.
Copyright (C) 1996-2022 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 <stdio.h>
#include <stdio-lock.h>
void
__flockfile (FILE *stream)
{
stream->_flags2 |= _IO_FLAGS2_NEED_LOCK;
_IO_lock_lock (*stream->_lock);
}
#if ! (defined __e2k__ && defined SHARED)
weak_alias (__flockfile, flockfile);
weak_alias (__flockfile, _IO_flockfile)
#else /* defined __e2k__ && defined SHARED */
weak_alias (__flockfile, __flockfile_weak)
# include <shlib-compat.h>
/* These symbols were also present in libc-2.29.so. Note that they don't
take care of preserving the original non-WEAKness of _IO_-symbol it
used to have (see `weak_alias ()'es above). See also below. */
versioned_symbol (libc, __flockfile_weak, flockfile, GLIBC_2_0);
versioned_symbol (libc, __flockfile_weak, _IO_flockfile, GLIBC_2_0);
/* For the sake of runtime compatibility with libpthread-2.29.so. Note that
_IO_flockfile@@GLIBC_2.0 used to be created as strong_alias () in it
which was "accidentally" changed when getting rid of the implementation in
sysdeps/pthread. */
compat_symbol (libpthread, __flockfile_weak, flockfile, GLIBC_2_0);
/* This extra strong_alias () is required because `__f{,un}lockfile ()'s turn
out to be HIDDEN unlike `__ftrylockfile ()' (???!!!) and the created dynamic
symbol should not inherit this inappropriate visibility which is sure to
eventually make it LOCAL. */
strong_alias (__flockfile, __flockfile_strong)
compat_symbol (libpthread, __flockfile_strong, _IO_flockfile, GLIBC_2_0);
#endif /* defined __e2k__ && defined SHARED */