diff --git a/Makefile b/Makefile
index 1fcfc52..dc62a42 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,7 @@ LDFLAGS ?= -flto
 LDFLAGS += $(call if_coverage,--coverage)
 
 # Project configuration ########################################################
-RL_C      := wireprotocol.c header.c body.c attrs.c frame.c
+RL_C      := wireprotocol.c header.c body.c attrs.c frame.c frontend.c
 RL_O      := $(RL_C:.c=.o)
 CFILES    := main.c log.c utils.c serialization.c ucspi.c npthfix.c
 OFILES    := $(RL_O) $(CFILES:.c=.o)
diff --git a/frob.h b/frob.h
index 685f9b9..d8070ba 100644
--- a/frob.h
+++ b/frob.h
@@ -288,6 +288,7 @@ static_assert(sizeof (struct frob_msg) % 16 == 0, "Message shall fit into 16-byt
 #pragma once
 
 struct fsm_frontend_foreign_args {
+    int in;
     int cs;
 };
 
@@ -300,7 +301,7 @@ struct fsm_frontend_timer_args {
 };
 
 struct fsm_wireformat_args {
-    const int infd;
+    const int in, out;
 };
 
 struct autoresponder_args {
@@ -320,7 +321,7 @@ struct s6_notify_args {
 };
 
 void* fsm_wireformat(const struct fsm_wireformat_args*);
-int fsm_frontend_foreign(struct fsm_frontend_foreign_args*);
+void* fsm_frontend_foreign(struct fsm_frontend_foreign_args*);
 int fsm_frontend_internal(struct fsm_frontend_internal_args*);
 int fsm_frontend_timer(struct fsm_frontend_timer_args*);
 int autoresponder(const struct autoresponder_args*);
diff --git a/fsm/frontend.rl b/fsm/frontend.rl
index 4648c01..8b09efb 100644
--- a/fsm/frontend.rl
+++ b/fsm/frontend.rl
@@ -1,10 +1,10 @@
-#include "multitasking/sus.h"
 #include "frob.h"
 #include "log.h"
 #include "utils.h"
 #include <stdbool.h>
 #include <sys/timerfd.h>
 #include <unistd.h>
+#include <npth.h>
 
 static int cs;
 
@@ -31,18 +31,18 @@ static int cs;
         acknak = 0x15;
     }
     action Send {
-        if (sus_write(6, &acknak, 1) != 1) {
+        LOGDXP(char tmp[4*1], "← % 4d %s", 1, PRETTY(&acknak, &acknak + 1, tmp));
+        if (npth_write(6, &acknak, 1) != 1) {
             LOGE("write");
             fbreak;
         }
-        LOGDXP(char tmp[4*1], "← % 4d %s", 1, PRETTY(&acknak, &acknak + 1, tmp));
     }
     action Process {
         LOGDXP(char tmp[4*(pe-p)], "Lending %zd bytes: %s", pe - p, PRETTY((unsigned char*)p, (unsigned char*)pe, tmp));
-        sus_lend(1, pe - p, (char*)p);// TODO: Remove this cast
+        //sus_lend(1, pe - p, (char*)p);// TODO: Remove this cast
     }
     action Forward {
-        if (sus_write(forwarded_fd, p, pe - p) != pe - p) {
+        if (npth_write(forwarded_fd, p, pe - p) != pe - p) {
             LOGE("write");
             fbreak;
         }
@@ -76,24 +76,22 @@ static int fsm_exec(const char* p, const char* const pe) {
 __attribute__((constructor))
 void fsm_frontend_init() {
     (void)frontend_en_main, (void)frontend_error, (void)frontend_first_final;
-    set_nonblocking(6);
     %% write init;
 }
 
-int fsm_frontend_foreign(struct fsm_frontend_foreign_args* const a) {
+void* fsm_frontend_foreign(struct fsm_frontend_foreign_args* const a) {
     (void)a;
     ssize_t bytes;
+    char buf[1024];
     const char* p;
-    while ((bytes = sus_borrow(0, (void**)&p)) >= 0) {
+    while ((bytes = npth_read(a->in, buf, sizeof buf)) >= 0) {
         LOGDX("Received %zd bytes", bytes);
-        const char* const pe = p + bytes;
+        const char* const pe = (p = buf) + bytes;
         fsm_exec(p, pe);
-        sus_return(0, p, bytes);
     }
     if (bytes < 0)
         LOGE("Closing fronted");
-    sus_disable(1);
-    return -1;
+    return NULL;
 }
 
 int fsm_frontend_internal(struct fsm_frontend_internal_args* const a) {
@@ -114,7 +112,7 @@ int fsm_frontend_timer(struct fsm_frontend_timer_args* const a) {
     const int fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
     ssize_t bytes;
     unsigned char buf[8];
-    while ((bytes = sus_read(fd, buf, sizeof buf)) > 0) {
+    while ((bytes = npth_read(fd, buf, sizeof buf)) > 0) {
         const char* p = (char[]){0}, * const pe = p + 1;
         fsm_exec(p, pe);
     }
diff --git a/fsm/wireprotocol.rl b/fsm/wireprotocol.rl
index 91d97b8..d9fdb81 100644
--- a/fsm/wireprotocol.rl
+++ b/fsm/wireprotocol.rl
@@ -18,9 +18,9 @@
     }
     action LRC_Check {
         if (lrc != fc) {
-            //sus_lend(0, 1, "\x03");
+            npth_write(args->out, "\x03", 1);
         } else {
-            //sus_lend(0, fpc - start, buf);
+            npth_write(args->out, buf, fpc - start);
         }
     }
     action Frame_Start {
@@ -41,7 +41,7 @@ void* fsm_wireformat(const struct fsm_wireformat_args* const args) {
     int cs;
     unsigned char* p = buf, * pe = p;
     %% write init;
-    while ((bytes = npth_read(args->infd, buf, sizeof buf)) > 0) {
+    while ((bytes = npth_read(args->in, buf, sizeof buf)) > 0) {
         pe = (p = buf) + bytes;
         LOGDXP(char tmp[4*bytes], "→ % 4zd %s", bytes, PRETTY(p, pe, tmp));
         %% write exec;
diff --git a/main.c b/main.c
index 0d2a3d4..aa92065 100644
--- a/main.c
+++ b/main.c
@@ -1,22 +1,10 @@
 #include "log.h"
 #include "utils.h"
 #include "frob.h"
+#include "npthfix.h"
 #include <unistd.h>
 #include <signal.h>
 #include <sys/resource.h>
-#include <npth.h>
-
-typedef void* (* const npth_entry_t)(void*);
-
-struct ThreadBag {
-    npth_t handle;
-    const char* const name;
-    npth_entry_t entry;
-    void* const arg;
-};
-
-#define npth_define(Entry, ...) \
-    { .entry = (npth_entry_t)Entry, .name = #Entry, .arg = &(struct Entry ## _args){ __VA_ARGS__ } }
 
 static void adjust_rlimit(void) {
     // This will force syscalls that allocate file descriptors to fail if it
@@ -35,10 +23,13 @@ int main(const int ac, const char* av[static const ac]) {
     adjust_rlimit();
     int fd_fo_main = STDOUT_FILENO, fd_fi_main = STDIN_FILENO;
     ucsp_info_and_adjust_fds(&fd_fo_main, &fd_fi_main);
+    int frontend_pipe[2];
+    xpipe(frontend_pipe);
     struct ThreadBag thr[] = {
-        npth_define(fsm_wireformat, .infd = fd_fi_main)
+        npth_define(fsm_wireformat, .in = fd_fi_main, .out = frontend_pipe[1]),
+        npth_define(fsm_frontend_foreign, .in = frontend_pipe[0])
     };
-    npth_init();
+    xnpth_init();
     npth_sigev_init();
     npth_sigev_add(SIGPWR);
     npth_sigev_fini();
@@ -48,7 +39,6 @@ int main(const int ac, const char* av[static const ac]) {
     }
     for (;;) {
         int sig;
-        LOGDX("Waiting for a signal...");
         xnpth_sigwait(npth_sigev_sigmask(), &sig);
         switch (sig) {
             case SIGPWR:
diff --git a/npthfix.c b/npthfix.c
new file mode 100644
index 0000000..c2240af
--- /dev/null
+++ b/npthfix.c
@@ -0,0 +1,8 @@
+#include "npthfix.h"
+
+int npth_sigwait(const sigset_t *set, int *sig) {
+    npth_unprotect();
+    const int res = sigwait(set, sig);
+    npth_protect();
+    return res;
+}
diff --git a/npthfix.h b/npthfix.h
new file mode 100644
index 0000000..01e1076
--- /dev/null
+++ b/npthfix.h
@@ -0,0 +1,14 @@
+#pragma once
+#include <npth.h>
+
+#define npth_define(Entry, ...) \
+    { .entry = (npth_entry_t)Entry, .name = #Entry, .arg = &(struct Entry ## _args){ __VA_ARGS__ } }
+
+typedef void* (* const npth_entry_t)(void*);
+
+struct ThreadBag {
+    npth_t handle;
+    const char* const name;
+    npth_entry_t entry;
+    void* const arg;
+};
diff --git a/utils.c b/utils.c
index 2fd32bb..2029365 100644
--- a/utils.c
+++ b/utils.c
@@ -10,12 +10,12 @@
 #include <fcntl.h>
 #include <execinfo.h>
 
-void set_nonblocking(const int fd) {
+void set_blocking(const int fd) {
     const int flags = fcntl(fd, F_GETFL, 0);
     if (flags == -1)
         EXITF("fcntl F_GETFL");
-    if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
-        EXITF("fcntl F_SETFL O_NONBLOCK");
+    if (fcntl(fd, F_SETFL, flags & ~O_NONBLOCK) == -1)
+        EXITF("fcntl F_SETFL ~O_NONBLOCK");
 }
 
 input_t calculate_lrc(input_t* p, const input_t* const pe) {
diff --git a/utils.h b/utils.h
index 3fac565..0c3f7f5 100644
--- a/utils.h
+++ b/utils.h
@@ -67,6 +67,7 @@
 #define xnpth_setname_np(...) XCALL(npth_setname_np, __VA_ARGS__)
 #define xnpth_create(...) XCALL(npth_create, __VA_ARGS__)
 #define xnpth_sigwait(...) XCALL(npth_sigwait, __VA_ARGS__)
+#define xnpth_init(...) XCALL(npth_init, __VA_ARGS__)
 #define xfprintf(...) XCALL(fprintf, __VA_ARGS__)
 #define xfputs(...) XCALL(fputs, __VA_ARGS__)
 #define xfflush(...) XCALL(fflush, __VA_ARGS__)
@@ -78,6 +79,7 @@
 #define xwrite(...) XCALL(write, __VA_ARGS__)
 #define xfclose(...) XCALL(fclose, __VA_ARGS__)
 #define xclose(...) XCALL(close, __VA_ARGS__)
+#define xpipe(...) XCALL(pipe, __VA_ARGS__)
 
 #ifdef NDEBUG
 #   define XCALL(Syscall, ...) syscall_exitf(#Syscall, Syscall(__VA_ARGS__))
@@ -102,7 +104,7 @@
 typedef uint8_t input_t;
 
 
-void set_nonblocking(int fd);
+void set_blocking(int fd);
 
 byte_t hex2nibble(char h);
 byte_t unhex(const char h[static 2]);