github.com/c9s/go@v0.0.0-20180120015821-984e81f64e0c/src/runtime/cgo/gcc_mmap.c (about)

     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
     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  }