Text file src/runtime/cgo/gcc_mmap.c

     1	// Copyright 2015 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build linux,amd64 linux,arm64
     6	
     7	#include <errno.h>
     8	#include <stdint.h>
     9	#include <stdlib.h>
    10	#include <sys/mman.h>
    11	
    12	#include "libcgo.h"
    13	
    14	uintptr_t
    15	x_cgo_mmap(void *addr, uintptr_t length, int32_t prot, int32_t flags, int32_t fd, uint32_t offset) {
    16		void *p;
    17	
    18		_cgo_tsan_acquire();
    19		p = mmap(addr, length, prot, flags, fd, offset);
    20		_cgo_tsan_release();
    21		if (p == MAP_FAILED) {
    22			/* This is what the Go code expects on failure.  */
    23			return (uintptr_t)errno;
    24		}
    25		return (uintptr_t)p;
    26	}
    27	
    28	void
    29	x_cgo_munmap(void *addr, uintptr_t length) {
    30		int r;
    31	
    32		_cgo_tsan_acquire();
    33		r = munmap(addr, length);
    34		_cgo_tsan_release();
    35		if (r < 0) {
    36			/* The Go runtime is not prepared for munmap to fail.  */
    37			abort();
    38		}
    39	}

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