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runtime: fix mmap error return on linux.

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Fixes #1511 again.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/4527070
This commit is contained in:
Dmitry Chestnykh 2011-05-26 21:43:27 -07:00 committed by Ian Lance Taylor
parent bddb75127f
commit e4492ce3c3
1 changed files with 10 additions and 2 deletions
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12
src/pkg/runtime/linux/mem.c
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@ -39,13 +39,19 @@ runtime·SysFree(void *v, uintptr n)
void*
runtime·SysReserve(void *v, uintptr n)
{
void *p;
// On 64-bit, people with ulimit -v set complain if we reserve too
// much address space. Instead, assume that the reservation is okay
// and check the assumption in SysMap.
if(sizeof(void*) == 8)
return v;
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
if(p < (void*)4096) {
return nil;
}
return p;
}
enum
@ -63,6 +69,8 @@ runtime·SysMap(void *v, uintptr n)
// On 64-bit, we don't actually have v reserved, so tread carefully.
if(sizeof(void*) == 8) {
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(p == (void*)ENOMEM)
runtime·throw("runtime: out of memory");
if(p != v) {
runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
runtime·throw("runtime: address space conflict");
@ -71,7 +79,7 @@ runtime·SysMap(void *v, uintptr n)
}
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p == (void*)-ENOMEM)
if(p == (void*)ENOMEM)
runtime·throw("runtime: out of memory");
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");