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103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/* Copyright (C) 2000-2014 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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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <sysdep-cancel.h> /* Must come before <fcntl.h>. */
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#include <fcntl.h>
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#include <stdarg.h>
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#include <sys/syscall.h>
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#include <kernel-features.h>
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#ifdef __ASSUME_F_GETOWN_EX
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# define miss_F_GETOWN_EX 0
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#else
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static int miss_F_GETOWN_EX;
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#endif
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static int
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do_fcntl (int fd, int cmd, void *arg)
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{
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if (cmd != F_GETOWN || miss_F_GETOWN_EX)
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return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
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INTERNAL_SYSCALL_DECL (err);
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struct f_owner_ex fex;
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int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
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if (!INTERNAL_SYSCALL_ERROR_P (res, err))
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return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
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#ifndef __ASSUME_F_GETOWN_EX
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if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
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{
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res = INLINE_SYSCALL (fcntl, 3, fd, F_GETOWN, arg);
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miss_F_GETOWN_EX = 1;
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return res;
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}
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#endif
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__set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
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return -1;
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}
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#ifndef NO_CANCELLATION
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int
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__fcntl_nocancel (int fd, int cmd, ...)
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{
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va_list ap;
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void *arg;
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va_start (ap, cmd);
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arg = va_arg (ap, void *);
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va_end (ap);
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return do_fcntl (fd, cmd, arg);
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}
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#endif
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int
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__libc_fcntl (int fd, int cmd, ...)
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{
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va_list ap;
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void *arg;
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va_start (ap, cmd);
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arg = va_arg (ap, void *);
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va_end (ap);
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if (SINGLE_THREAD_P || cmd != F_SETLKW)
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return do_fcntl (fd, cmd, arg);
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int oldtype = LIBC_CANCEL_ASYNC ();
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int result = do_fcntl (fd, cmd, arg);
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LIBC_CANCEL_RESET (oldtype);
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return result;
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}
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libc_hidden_def (__libc_fcntl)
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weak_alias (__libc_fcntl, __fcntl)
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libc_hidden_weak (__fcntl)
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weak_alias (__libc_fcntl, fcntl)
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