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https://github.com/golang/go
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3b9702c9c8
On Darwin and FreeBSD, the mmap syscall return value is returned unmodified. This means that the return value will either be a valid address or a positive error number. Also check return value from mmap in SysReserve - the callers of SysReserve expect nil to be returned if the allocation failed. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/7871043
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
// Copyright 2010 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 "runtime.h"
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#include "arch_GOARCH.h"
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#include "defs_GOOS_GOARCH.h"
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#include "os_GOOS.h"
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#include "malloc.h"
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enum
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{
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ENOMEM = 12,
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};
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void*
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runtime·SysAlloc(uintptr n)
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{
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void *v;
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mstats.sys += n;
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v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(v < (void*)4096)
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return nil;
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return v;
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}
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void
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runtime·SysUnused(void *v, uintptr n)
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{
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runtime·madvise(v, n, MADV_FREE);
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}
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void
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runtime·SysFree(void *v, uintptr n)
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{
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mstats.sys -= n;
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runtime·munmap(v, n);
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}
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void*
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runtime·SysReserve(void *v, uintptr n)
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{
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void *p;
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// On 64-bit, people with ulimit -v set complain if we reserve too
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// much address space. Instead, assume that the reservation is okay
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// and check the assumption in SysMap.
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if(sizeof(void*) == 8)
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return v;
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p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(p < (void*)4096)
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return nil;
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return p;
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}
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void
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runtime·SysMap(void *v, uintptr n)
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{
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void *p;
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mstats.sys += n;
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// On 64-bit, we don't actually have v reserved, so tread carefully.
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if(sizeof(void*) == 8) {
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p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(p == (void*)ENOMEM)
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runtime·throw("runtime: out of memory");
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if(p != v) {
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runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
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runtime·throw("runtime: address space conflict");
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}
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return;
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}
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p = runtime·mmap(v, n, PROT_READ|PROT_WRITE, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
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if(p == (void*)ENOMEM)
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runtime·throw("runtime: out of memory");
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if(p != v)
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runtime·throw("runtime: cannot map pages in arena address space");
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}
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