zig
zig copied to clipboard
ziglang
stdin is NotOpenForReading when you run `zig build run`
Zig Version
0.10.0-dev.3315+1a16b7214
Steps to Reproduce
// main.zig
const std = @import("std");
const stdout = std.io.getStdOut().writer();
const stdin = std.io.getStdIn().reader();
pub fn main() !void {
var general_purpose_allocator = std.heap.GeneralPurposeAllocator(.{}){};
const galloc = general_purpose_allocator.allocator();
defer _ = general_purpose_allocator.deinit();
const input = try stdin.readUntilDelimiterAlloc(galloc, '\n', 1000);
defer galloc.free(input);
_ = try stdout.print("input = {s}\n", .{input});
}
// build.zig
const std = @import("std");
pub fn build(b: *std.build.Builder) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard release options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
const mode = b.standardReleaseOptions();
const exe = b.addExecutable("app", "src/main.zig");
exe.setTarget(target);
exe.setBuildMode(mode);
exe.install();
const run_cmd = exe.run();
run_cmd.step.dependOn(b.getInstallStep());
if (b.args) |args| {
run_cmd.addArgs(args);
}
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
const exe_tests = b.addTest("src/main.zig");
exe_tests.setTarget(target);
exe_tests.setBuildMode(mode);
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&exe_tests.step);
}
zig build run
Expected Behavior
should be able to read from stdin
Actual Behavior
~/projects/exp/zig
❯ zig build run
error: NotOpenForReading
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:650:22: 0x228fd5 in std.os.read (app)
.BADF => return error.NotOpenForReading, // Can be a race condition.
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/fs/file.zig:975:13: 0x228e31 in std.fs.file.File.read (app)
return os.read(self.handle, buffer);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/io/reader.zig:26:13: 0x22ca1f in std.io.reader.Reader(std.fs.file.File,std.os.ReadError,std.fs.file.File.read)
.read (app)
return readFn(self.context, buffer);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/io/reader.zig:232:30: 0x22c930 in std.io.reader.Reader(std.fs.file.File,std.os.ReadError,std.fs.file.File.read
).readByte (app)
const amt_read = try self.read(result[0..]);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/io/reader.zig:114:32: 0x22c811 in std.io.reader.Reader(std.fs.file.File,std.os.ReadError,std.fs.file.File.read
).readUntilDelimiterArrayList (app)
var byte: u8 = try self.readByte();
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/io/reader.zig:136:13: 0x22c562 in std.io.reader.Reader(std.fs.file.File,std.os.ReadError,std.fs.file.File.read
).readUntilDelimiterAlloc (app)
try self.readUntilDelimiterArrayList(&array_list, delimiter, max_size);
^
/home/username/projects/exp/zig/src/main.zig:10:19: 0x22a1a3 in main (app)
const input = try stdin.readUntilDelimiterAlloc(galloc, '\n', 1000);
^
The following command exited with error code 1 (expected 0):
cd /home/username/projects/exp/zig && /home/username/projects/exp/zig/zig-out/bin/app
error: UnexpectedExitCode
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:2749:19: 0x2a168b in std.os.mkdiratZ (build)
.EXIST => return error.PathAlreadyExists,
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:2709:9: 0x2a1573 in std.os.mkdirat (build)
return mkdiratZ(dir_fd, &sub_dir_path_c, mode);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/fs.zig:1332:9: 0x2a1466 in std.fs.Dir.makeDir (build)
try os.mkdirat(self.fd, sub_path, default_new_dir_mode);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:1680:23: 0x28afdd in std.os.openatZ (build)
.NOENT => return error.FileNotFound,
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/fs.zig:1081:13: 0x276e4c in std.fs.Dir.openFileZ (build)
try os.openatZ(self.fd, sub_path, os_flags, 0);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/fs.zig:1008:9: 0x274c61 in std.fs.Dir.openFile (build)
return self.openFileZ(&path_c, flags);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:2754:19: 0x2a1702 in std.os.mkdiratZ (build)
.NOENT => return error.FileNotFound,
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/os.zig:2709:9: 0x2a1573 in std.os.mkdirat (build)
return mkdiratZ(dir_fd, &sub_dir_path_c, mode);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/fs.zig:1332:9: 0x2a1466 in std.fs.Dir.makeDir (build)
try os.mkdirat(self.fd, sub_path, default_new_dir_mode);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build/RunStep.zig:277:17: 0x2dc687 in std.build.RunStep.runCommand (build)
return error.UnexpectedExitCode;
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build/RunStep.zig:183:5: 0x2ccad6 in std.build.RunStep.make (build)
try runCommand(
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build.zig:3648:9: 0x2a1b9e in std.build.Step.make (build)
try self.makeFn(self);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build.zig:508:9: 0x2a0fec in std.build.Builder.makeOneStep (build)
try s.make();
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build.zig:502:17: 0x2a0f98 in std.build.Builder.makeOneStep (build)
return err;
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/std/build.zig:463:13: 0x2974c1 in std.build.Builder.make (build)
try self.makeOneStep(s);
^
/home/username/zig/0.10.0-dev.3315+1a16b7214/files/lib/build_runner.zig:213:21: 0x2911b5 in main (build)
else => return err,
^
error: the following build command failed with exit code 1:
/home/username/projects/exp/zig/zig-cache/o/f68e9a1804c76861e552af4fc326bcdf/build /home/username/zig/0.10.0-dev.3315+1a16b7214/files/zig /home/username/projects/exp/z
ig /home/username/projects/exp/zig/zig-cache /home/username/.cache/zig run
this error only happens when build.zig is being compiled when you execute zig build run
so if you run zig build run again this error does not occur
This issue no longer occurs in the latest version 0.11.0-dev.201+3c3def6ac