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expose mmap size and offset option (#141)

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* expose mmap size and offset option

* fix panics
This commit is contained in:
evan
2022-04-14 05:08:56 +03:00
committed by GitHub
parent 95101870e4
commit 95aa76b9fa
2 changed files with 18 additions and 5 deletions
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10
src/javascript/jsc/node/syscall.zig
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@@ -486,21 +486,23 @@ fn mmap(
return Maybe([]align(mem.page_size) u8){ .result = @ptrCast([*]align(mem.page_size) u8, @alignCast(mem.page_size, rc))[0..length] };
}
pub fn mmapFile(path: [:0]const u8, flags: u32) Maybe([]align(mem.page_size) u8) {
pub fn mmapFile(path: [:0]const u8, flags: u32, wanted_size: ?usize, offset: usize) Maybe([]align(mem.page_size) u8) {
const fd = switch (open(path, os.O.RDWR, 0)) {
.result => |fd| fd,
.err => |err| return .{ .err = err },
};
const size = switch (fstat(fd)) {
var size = std.math.sub(usize, @intCast(usize, switch (fstat(fd)) {
.result => |result| result.size,
.err => |err| {
_ = close(fd);
return .{ .err = err };
},
};
}), offset) catch 0;
const map = switch (mmap(null, @intCast(usize, size), os.PROT.READ | os.PROT.WRITE, flags, fd, 0)) {
if (wanted_size) |size_| size = @minimum(size, size_);
const map = switch (mmap(null, size, os.PROT.READ | os.PROT.WRITE, flags, fd, offset)) {
.result => |map| map,
.err => |err| {