mirrors/bun.sh
1
0
Fork 0
mirror of https://github.com/oven-sh/bun synced 2026-02-11 03:18:53 +00:00
Code Issues Packages Projects Releases Wiki Activity

expose mmap size and offset option (#141)

Browse Source 
* 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
Download Patch File Download Diff File Expand all files Collapse all files

13
src/javascript/jsc/api/bun.zig
View File

@@ -1619,18 +1619,29 @@ pub fn mmapFile(
const file_flags: u32 = if (@hasDecl(std.os.MAP, "FILE")) std.os.MAP.FILE else 0;
// Conforming applications must specify either MAP_PRIVATE or MAP_SHARED.
var offset: usize = 0;
var flags = file_flags;
var map_size: ?usize = null;
if (args.nextEat()) |opts| {
const sync = opts.get(ctx.ptr(), "sync") orelse JSC.JSValue.jsBoolean(false);
const shared = opts.get(ctx.ptr(), "shared") orelse JSC.JSValue.jsBoolean(true);
flags |= @as(u32, if (sync.toBoolean()) sync_flags else 0);
flags |= @as(u32, if (shared.toBoolean()) std.os.MAP.SHARED else std.os.MAP.PRIVATE);
if (opts.get(ctx.ptr(), "size")) |value| {
map_size = @intCast(usize, value.toInt64());
}
if (opts.get(ctx.ptr(), "offset")) |value| {
offset = @intCast(usize, value.toInt64());
offset = std.mem.alignBackwardAnyAlign(offset, std.mem.page_size);
}
} else {
flags |= std.os.MAP.SHARED;
}
const map = switch (JSC.Node.Syscall.mmapFile(buf_z, flags)) {
const map = switch (JSC.Node.Syscall.mmapFile(buf_z, flags, map_size, offset)) {
.result => |map| map,
.err => |err| {

10
src/javascript/jsc/node/syscall.zig
View File

@@ -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| {