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linux: Update the mremap C implementation [BZ #31968]
Update the mremap C implementation to support the optional argument for MREMAP_DONTUNMAP added in Linux 5.7 since it may not always be correct to implement a variadic function as a non-variadic function on all Linux targets. Return MAP_FAILED and set errno to EINVAL for unknown flag bits. This fixes BZ #31968. Note: A test must be added when a new flag bit is introduced. Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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@ -20,6 +20,12 @@
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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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@ -27,7 +33,13 @@ __mremap (void *addr, size_t old_len, size_t new_len, int flags, ...)
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va_list va;
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void *new_addr = NULL;
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if (flags & MREMAP_FIXED)
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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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