odin-lang.Odin/core/os/os2/pipe_posix.odin

//+private
//+build darwin, netbsd, freebsd, openbsd
package os2

import "core:sys/posix"
import "core:strings"

_pipe :: proc() -> (r, w: ^File, err: Error) {
	fds: [2]posix.FD
	if posix.pipe(&fds) != .OK {
		err = _get_platform_error()
		return
	}

	if posix.fcntl(fds[0], .SETFD, i32(posix.FD_CLOEXEC)) == -1 {
		err = _get_platform_error()
		return
	}
	if posix.fcntl(fds[1], .SETFD, i32(posix.FD_CLOEXEC)) == -1 {
		err = _get_platform_error()
		return
	}

	r = __new_file(fds[0])
	ri := (^File_Impl)(r.impl)

	rname := strings.builder_make(file_allocator())
	// TODO(laytan): is this on all the posix targets?
	strings.write_string(&rname, "/dev/fd/")
	strings.write_int(&rname, int(fds[0]))
	ri.name  = strings.to_string(rname)
	ri.cname = strings.to_cstring(&rname)

	w = __new_file(fds[1])
	wi := (^File_Impl)(w.impl)
	
	wname := strings.builder_make(file_allocator())
	// TODO(laytan): is this on all the posix targets?
	strings.write_string(&wname, "/dev/fd/")
	strings.write_int(&wname, int(fds[1]))
	wi.name  = strings.to_string(wname)
	wi.cname = strings.to_cstring(&wname)

	return
}