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Merge "Add mmap64()"

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Elliott Hughes 2013-09-19 21:22:42 +00:00 committed by Gerrit Code Review
commit f8e71bac14
2 changed files with 7 additions and 2 deletions
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8
libc/bionic/mmap.cpp
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@ -37,13 +37,13 @@ extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
#define MMAP2_SHIFT 12 // 2**12 == 4096
void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset) {
void* mmap64(void* addr, size_t size, int prot, int flags, int fd, off64_t offset) {
if (offset & ((1UL << MMAP2_SHIFT)-1)) {
errno = EINVAL;
return MAP_FAILED;
}
size_t unsigned_offset = static_cast<size_t>(offset); // To avoid sign extension.
uint64_t unsigned_offset = static_cast<uint64_t>(offset); // To avoid sign extension.
void* result = __mmap2(addr, size, prot, flags, fd, unsigned_offset >> MMAP2_SHIFT);
if (result != MAP_FAILED && (flags & (MAP_PRIVATE | MAP_ANONYMOUS)) != 0) {
@ -53,3 +53,7 @@ void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset) {
return result;
}
void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset) {
return mmap64(addr, size, prot, flags, fd, static_cast<off64_t>(offset));
}

1
libc/include/sys/mman.h
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@ -45,6 +45,7 @@ __BEGIN_DECLS
#define MREMAP_FIXED 2
extern void* mmap(void *, size_t, int, int, int, off_t);
extern void* mmap64(void *, size_t, int, int, int, off64_t);
extern int munmap(void *, size_t);
extern int msync(const void *, size_t, int);
extern int mprotect(const void *, size_t, int);