Hello,
I am trying to call another binary/command from zig and provide stdin for it.
This is the shell command I am trying to reproduce:
echo hello | grep o
The following code works, if I remove the .wait and term part.
But I want the exit code to check if everything worked.
Any ideas or help is appreciated.
const std = @import("std");
const print = std.debug.print;
const Child = std.process.Child;
const ArrayList = std.ArrayList;
pub fn main() !void {
const allocator = std.heap.page_allocator;
const argv = [_][]const u8{ "grep", "o" };
var child = Child.init(&argv, allocator);
child.stdin_behavior = .Pipe;
child.stdout_behavior = .Pipe;
child.stderr_behavior = .Pipe;
var stdout = ArrayList(u8).init(allocator);
var stderr = ArrayList(u8).init(allocator);
defer {
stdout.deinit();
stderr.deinit();
}
try child.spawn();
if (child.stdin) |stdin| {
const writer = stdin.writer();
try writer.writeAll("hello");
stdin.close();
}
try child.collectOutput(&stdout, &stderr, 1024);
const term = try child.wait();
try std.testing.expectEqual(term.Exited, 0);
try std.testing.expectEqualStrings("hello\n", stdout.items);
try std.testing.expectEqualStrings("", stderr.items);
}