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don't try to mmap 0-sized things (#26)

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This commit is contained in:
Ethan Roseman
2022-09-25 02:03:40 +09:00
committed by GitHub
parent b65a585ee3
commit 681137902b
1 changed files with 15 additions and 4 deletions
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11
dll/kernel32.cpp
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@@ -405,8 +405,10 @@ namespace kernel32 {
fclose(fp);
}
} else if (data.type == handles::TYPE_MAPPED) {
if (data.ptr != (void *) 0x1) {
munmap(data.ptr, data.size);
}
}
return 1;
}
@@ -665,7 +667,11 @@ namespace kernel32 {
void *mmapped;
if (hFile == (void*) -1) { // INVALID_HANDLE_VALUE
if (size == 0) {
mmapped = (void *) 0x1;
} else {
mmapped = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
}
} else {
int fd = fileno(files::fpFromHandle(hFile));
@@ -675,8 +681,13 @@ namespace kernel32 {
return (void*) -1;
}
}
if (size == 0) {
mmapped = (void *) 0x1;
} else {
mmapped = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
}
}
assert(mmapped != MAP_FAILED);
return handles::allocDataHandle({handles::TYPE_MAPPED, mmapped, (unsigned int) size});