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c3b287be74
During critical sections, signal handling is deferred and thus RPCs return EINTR, even if SA_RESTART is set. We thus have to restart the whole critical section in that case. This also adds HURD_CRITICAL_UNLOCK in the cases where one wants to break the section in the middle.
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Change a port cell to a directory in an open file descriptor.
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Copyright (C) 1999-2021 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 <errno.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/port.h>
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#include <hurd/fd.h>
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#include <fcntl.h>
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int
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_hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd)
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{
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int ret;
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struct hurd_fd *d = _hurd_fd_get (fd);
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if (!d)
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return __hurd_fail (EBADF);
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retry:
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HURD_CRITICAL_BEGIN;
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ret = HURD_PORT_USE (&d->port,
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({
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int ret;
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/* We look up "." to force ENOTDIR if it's not a
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directory and EACCES if we don't have search
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permission. */
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file_t dir = __file_name_lookup_under (port, ".",
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O_NOTRANS, 0);
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if (dir == MACH_PORT_NULL)
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ret = -1;
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else
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{
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_hurd_port_set (portcell, dir);
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ret = 0;
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}
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ret;
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}));
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HURD_CRITICAL_END;
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if (ret == -1 && errno == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry again */
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goto retry;
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return ret;
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}
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