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langref: update WASI preopens example

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This commit is contained in:
Andrew Kelley 2022-12-05 17:21:33 -07:00
parent 823d1e7087
commit 4451786c66
1 changed files with 11 additions and 7 deletions
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18
doc/langref.html.in
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@ -10961,24 +10961,28 @@ pub fn main() !void {
{#code_begin|exe|preopens#}
{#target_wasi#}
const std = @import("std");
const PreopenList = std.fs.wasi.PreopenList;
const fs = std.fs;
pub fn main() !void {
var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){};
const gpa = general_purpose_allocator.allocator();
var preopens = PreopenList.init(gpa);
defer preopens.deinit();
var arena_instance = std.heap.ArenaAllocator.init(gpa);
defer arena_instance.deinit();
const arena = arena_instance.allocator();
try preopens.populate(null);
const preopens = try fs.wasi.preopensAlloc(arena);
for (preopens.asSlice()) |preopen, i| {
std.debug.print("{}: {}\n", .{ i, preopen });
for (preopens.names) |preopen, i| {
std.debug.print("{}: {s}\n", .{ i, preopen });
}
}
{#code_end#}
{#shell_samp#}$ wasmtime --dir=. preopens.wasm
0: Preopen{ .fd = 3, .type = PreopenType{ .Dir = '.' } }
0: stdin
1: stdout
2: stderr
3: .
{#end_shell_samp#}
{#header_close#}
{#header_close#}