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54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* Remap a virtual memory address. Linux specific syscall.
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Copyright (C) 2021-2025 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 <sys/mman.h>
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#include <sysdep.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <errno.h>
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#define MREMAP_KNOWN_BITS \
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(MREMAP_MAYMOVE \
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| MREMAP_FIXED \
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| MREMAP_DONTUNMAP)
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void *
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__mremap (void *addr, size_t old_len, size_t new_len, int flags, ...)
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{
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va_list va;
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void *new_addr = NULL;
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if (flags & ~(MREMAP_KNOWN_BITS))
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{
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__set_errno (EINVAL);
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return MAP_FAILED;
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}
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if (flags & (MREMAP_FIXED | MREMAP_DONTUNMAP))
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{
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va_start (va, flags);
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new_addr = va_arg (va, void *);
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va_end (va);
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}
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return (void *) INLINE_SYSCALL_CALL (mremap, addr, old_len, new_len, flags,
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new_addr);
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}
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libc_hidden_def (__mremap)
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weak_alias (__mremap, mremap)
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