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const std = @import("std");
const builtins = @import("builtins.zig");
pub fn runExternalProgram(allocator: std.mem.Allocator, program_path: []const u8, argv: []const []const u8) !void {
const argv_z = try allocator.allocSentinel(?[*:0]const u8, argv.len, null);
defer allocator.free(argv_z);
for (argv, 0..) |arg, i| {
argv_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
}
defer {
for (argv_z[0..argv.len]) |arg_ptr| {
if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
}
const program_path_z = try allocator.dupeZ(u8, program_path);
defer allocator.free(program_path_z);
const pid = try std.posix.fork();
if (pid == 0) {
_ = std.posix.execveZ(program_path_z, argv_z, std.c.environ) catch {
std.posix.exit(1);
};
unreachable;
} else {
_ = std.posix.waitpid(pid, 0);
}
}
pub fn runExternalProgramWithRedirect(allocator: std.mem.Allocator, program_path: []const u8, argv: []const []const u8, output_file: ?[]const u8, error_file: ?[]const u8, append_file: ?[]const u8, append_error_file: ?[]const u8) !void {
const argv_z = try allocator.allocSentinel(?[*:0]const u8, argv.len, null);
defer allocator.free(argv_z);
for (argv, 0..) |arg, i| {
argv_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
}
defer {
for (argv_z[0..argv.len]) |arg_ptr| {
if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
}
const program_path_z = try allocator.dupeZ(u8, program_path);
defer allocator.free(program_path_z);
const pid = try std.posix.fork();
if (pid == 0) {
if (output_file) |file| {
const cwd = std.fs.cwd();
const fd = cwd.createFile(file, .{}) catch {
std.posix.exit(1);
};
defer fd.close();
try std.posix.dup2(fd.handle, 1);
} else if (append_file) |file| {
const cwd = std.fs.cwd();
const fd = cwd.openFile(file, .{ .mode = .write_only }) catch |err| blk: {
if (err == error.FileNotFound) {
break :blk cwd.createFile(file, .{}) catch {
std.posix.exit(1);
};
}
std.posix.exit(1);
};
defer fd.close();
fd.seekFromEnd(0) catch {
std.posix.exit(1);
};
try std.posix.dup2(fd.handle, 1);
}
if (error_file) |file| {
const cwd = std.fs.cwd();
const fd = cwd.createFile(file, .{}) catch {
std.posix.exit(1);
};
defer fd.close();
try std.posix.dup2(fd.handle, 2);
} else if (append_error_file) |file| {
const cwd = std.fs.cwd();
const fd = cwd.openFile(file, .{ .mode = .write_only }) catch |err| blk: {
if (err == error.FileNotFound) {
break :blk cwd.createFile(file, .{}) catch {
std.posix.exit(1);
};
}
std.posix.exit(1);
};
defer fd.close();
fd.seekFromEnd(0) catch {
std.posix.exit(1);
};
try std.posix.dup2(fd.handle, 2);
}
_ = std.posix.execveZ(program_path_z, argv_z, std.c.environ) catch {
std.posix.exit(1);
};
unreachable;
} else {
_ = std.posix.waitpid(pid, 0);
}
}
fn runBuiltinInChild(
allocator: std.mem.Allocator,
cmd_name: []const u8,
args: ?[]const u8,
stdin_fd: std.posix.fd_t,
stdout_fd: std.posix.fd_t,
) noreturn {
// Redirect stdin/stdout to provided fds (already valid)
if (stdin_fd != 0) std.posix.dup2(stdin_fd, 0) catch {};
if (stdout_fd != 1) std.posix.dup2(stdout_fd, 1) catch {};
var out_file = std.fs.File{ .handle = 1 };
var out_writer = out_file.writerStreaming(&.{});
const w = &out_writer.interface;
if (std.mem.eql(u8, cmd_name, "echo")) {
builtins.executeEcho(w, args) catch {};
} else if (std.mem.eql(u8, cmd_name, "type")) {
builtins.executeType(allocator, w, args) catch {};
} else if (std.mem.eql(u8, cmd_name, "pwd")) {
builtins.executePwd(allocator, w) catch {};
} else if (std.mem.eql(u8, cmd_name, "cd")) {
builtins.executeCd(allocator, w, args) catch {};
} else if (std.mem.eql(u8, cmd_name, "exit")) {
// exit inside pipeline child just exits child
}
std.posix.exit(0);
}
pub fn runPipeline(
allocator: std.mem.Allocator,
stages: []const Stage,
) !void {
if (stages.len == 0) return;
if (stages.len == 1) {
const s = stages[0];
if (s.is_builtin) {
runBuiltinInChild(allocator, s.name, s.args, 0, 1);
} else {
const argv_z = try allocator.allocSentinel(?[*:0]const u8, s.argv.?.len, @as(?[*:0]const u8, null));
defer allocator.free(argv_z);
for (s.argv.?, 0..) |arg, i| argv_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
defer {
for (argv_z[0..s.argv.?.len]) |arg_ptr| if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
const path_z = try allocator.dupeZ(u8, s.path.?);
defer allocator.free(path_z);
_ = std.posix.execveZ(path_z, argv_z, std.c.environ) catch std.posix.exit(1);
}
}
const pipes = try allocator.alloc([2]std.posix.fd_t, stages.len - 1);
defer allocator.free(pipes);
for (pipes) |*p| p.* = try std.posix.pipe();
var pids = try allocator.alloc(std.posix.pid_t, stages.len);
defer allocator.free(pids);
for (stages, 0..) |s, idx| {
const pid = try std.posix.fork();
if (pid == 0) {
if (idx > 0) {
try std.posix.dup2(pipes[idx - 1][0], 0);
}
if (idx + 1 < stages.len) {
try std.posix.dup2(pipes[idx][1], 1);
}
for (pipes) |p| {
std.posix.close(p[0]);
std.posix.close(p[1]);
}
if (s.is_builtin) {
runBuiltinInChild(allocator, s.name, s.args, 0, 1);
} else {
const argv_z = try allocator.allocSentinel(?[*:0]const u8, s.argv.?.len, @as(?[*:0]const u8, null));
defer allocator.free(argv_z);
for (s.argv.?, 0..) |arg, i| argv_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
defer {
for (argv_z[0..s.argv.?.len]) |arg_ptr| if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
const path_z = try allocator.dupeZ(u8, s.path.?);
defer allocator.free(path_z);
_ = std.posix.execveZ(path_z, argv_z, std.c.environ) catch std.posix.exit(1);
}
unreachable;
}
pids[idx] = pid;
}
for (pipes) |p| {
std.posix.close(p[0]);
std.posix.close(p[1]);
}
for (pids) |pid| {
_ = std.posix.waitpid(pid, 0);
}
}
pub const Stage = struct {
is_builtin: bool,
name: []const u8,
args: ?[]const u8,
path: ?[]const u8,
argv: ?[]const []const u8,
};
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