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const std = @import("std");
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);
}
}
pub fn runExternalPipeline(allocator: std.mem.Allocator, program1_path: []const u8, argv1: []const []const u8, program2_path: []const u8, argv2: []const []const u8) !void {
const argv1_z = try allocator.allocSentinel(?[*:0]const u8, argv1.len, null);
defer allocator.free(argv1_z);
for (argv1, 0..) |arg, i| {
argv1_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
}
defer {
for (argv1_z[0..argv1.len]) |arg_ptr| {
if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
}
const argv2_z = try allocator.allocSentinel(?[*:0]const u8, argv2.len, null);
defer allocator.free(argv2_z);
for (argv2, 0..) |arg, i| {
argv2_z[i] = (try allocator.dupeZ(u8, arg)).ptr;
}
defer {
for (argv2_z[0..argv2.len]) |arg_ptr| {
if (arg_ptr) |ptr| allocator.free(std.mem.span(ptr));
}
}
const program1_path_z = try allocator.dupeZ(u8, program1_path);
defer allocator.free(program1_path_z);
const program2_path_z = try allocator.dupeZ(u8, program2_path);
defer allocator.free(program2_path_z);
const fds = try std.posix.pipe();
const pid1 = try std.posix.fork();
if (pid1 == 0) {
std.posix.close(fds[0]);
try std.posix.dup2(fds[1], 1);
std.posix.close(fds[1]);
_ = std.posix.execveZ(program1_path_z, argv1_z, std.c.environ) catch {
std.posix.exit(1);
};
unreachable;
}
const pid2 = try std.posix.fork();
if (pid2 == 0) {
std.posix.close(fds[1]);
try std.posix.dup2(fds[0], 0);
std.posix.close(fds[0]);
_ = std.posix.execveZ(program2_path_z, argv2_z, std.c.environ) catch {
std.posix.exit(1);
};
unreachable;
}
std.posix.close(fds[0]);
std.posix.close(fds[1]);
_ = std.posix.waitpid(pid1, 0);
_ = std.posix.waitpid(pid2, 0);
}
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