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When casting between a pointer and an integer of a different size, GCC emits a warning (which is escalated to a build failure by -Werror). Indeed, if what you start with is a pointer, which you then cast to a shorter integer and then back again, you're going to cut off some bits of the pointer. But if you start with an integer (such as mach_port_t), then cast it to a longer pointer (void *), and then back to a shorter integer, you are fine. To keep GCC happy, cast through an intermediary uintptr_t, which is always the same size as a pointer. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230212111044.610942-4-bugaevc@gmail.com>
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* Cleanup function for `struct hurd_port' users.
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Copyright (C) 1995-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <mach.h>
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#include <hurd/port.h>
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/* The last user of the send right CLEANUP_DATA is now doing
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`longjmp (ENV, VAL)', and this will unwind the frame of
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that last user. Deallocate the right he will never get back to using. */
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void
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_hurd_port_cleanup (void *cleanup_data, jmp_buf env, int val)
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{
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mach_port_t port = (mach_port_t) (uintptr_t) cleanup_data;
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__mach_port_deallocate (__mach_task_self (), port);
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}
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/* We were cancelled while using a port, and called from the cleanup unwinding.
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*/
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void
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_hurd_port_use_cleanup (void *arg)
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{
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struct _hurd_port_use_data *data = arg;
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_hurd_port_free (data->p, &data->link, data->port);
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}
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