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efecb298d8
The final argument to mmap, of type off_t, varies. In CL 445375 we changed it to always use the C off_t type, but that broke 32-bit big-endian Linux systems. On those systems, using the C off_t type requires calling the mmap64 function. In C this is automatically handled by the <sys/mman.h> file. In Go, we would have to change the magic //extern comment to call mmap64 when appropriate. Rather than try to get that right, we instead go through a C function that uses C implicit type conversions to pick the right type. Fixes PR go/110297 Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/504415
22 lines
648 B
C
22 lines
648 B
C
/* go-mmap.c -- functions for calling C mmap functions.
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Copyright 2023 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "config.h"
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#include <stdint.h>
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#include <sys/mman.h>
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/* The exact C function to call varies between mmap and mmap64, and
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the size of the off_t argument also varies. Here we provide a
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function that Go code can call with consistent types. */
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void *
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__go_mmap(void *addr, uintptr_t length, int32_t prot, int32_t flags,
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int32_t fd, uintptr_t offset)
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{
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return mmap(addr, length, prot, flags, fd, offset);
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}
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