diff --git a/Makefile b/Makefile
index a30a9f6..b8a9229 100644
--- a/Makefile
+++ b/Makefile
@@ -12,8 +12,8 @@ ifeq ($(UNAME_SYS), Linux)
 			  -Wstrict-prototypes -Wmissing-prototypes \
 			  -pie -fPIE \
 			  -fno-strict-aliasing
-	XMPPIPE_SANDBOX ?= seccomp
-	XMPPIPE_SANDBOX_RLIMIT_NOFILE ?= 0
+	XMPPIPE_RESTRICT_PROCESS ?= seccomp
+	XMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE ?= 0
 	LDFLAGS ?= -Wl,-z,relro,-z,now -Wl,-z,noexecstack
 else ifeq ($(UNAME_SYS), FreeBSD)
 	CFLAGS ?= -DHAVE_STRTONUM \
@@ -21,7 +21,7 @@ else ifeq ($(UNAME_SYS), FreeBSD)
 			  -Wformat -Werror=format-security \
 			  -pie -fPIE \
 			  -fno-strict-aliasing
-	XMPPIPE_SANDBOX ?= capsicum
+	XMPPIPE_RESTRICT_PROCESS ?= capsicum
 	LDFLAGS ?= -Wl,-z,relro,-z,now -Wl,-z,noexecstack
 else ifeq ($(UNAME_SYS), OpenBSD)
 	CFLAGS ?= -DHAVE_STRTONUM \
@@ -29,7 +29,7 @@ else ifeq ($(UNAME_SYS), OpenBSD)
 			  -Wformat -Werror=format-security \
 			  -pie -fPIE \
 			  -fno-strict-aliasing
-	XMPPIPE_SANDBOX ?= pledge
+	XMPPIPE_RESTRICT_PROCESS ?= pledge
 	LDFLAGS ?= -Wl,-z,relro,-z,now -Wl,-z,noexecstack
 else ifeq ($(UNAME_SYS), SunOS)
 else ifeq ($(UNAME_SYS), Darwin)
@@ -39,15 +39,15 @@ else ifeq ($(UNAME_SYS), Darwin)
 			  -fno-strict-aliasing
 endif
 
-XMPPIPE_SANDBOX ?= rlimit
-XMPPIPE_SANDBOX_RLIMIT_NOFILE ?= -1
+XMPPIPE_RESTRICT_PROCESS ?= rlimit
+XMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE ?= -1
 
 XMPPIPE_CFLAGS ?= -g -Wall
 CFLAGS += $(XMPPIPE_CFLAGS) \
 		  -fwrapv \
-		  -DXMPPIPE_SANDBOX=\"$(XMPPIPE_SANDBOX)\" \
-		  -DXMPPIPE_SANDBOX_$(XMPPIPE_SANDBOX) \
-		  -DXMPPIPE_SANDBOX_RLIMIT_NOFILE=$(XMPPIPE_SANDBOX_RLIMIT_NOFILE)
+		  -DXMPPIPE_RESTRICT_PROCESS=\"$(XMPPIPE_RESTRICT_PROCESS)\" \
+		  -DXMPPIPE_RESTRICT_PROCESS_$(XMPPIPE_RESTRICT_PROCESS) \
+		  -DXMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE=$(XMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE)
 
 LDFLAGS += $(XMPPIPE_LDFLAGS)
 
diff --git a/src/strtonum.c b/src/strtonum.c
index a593c10..509fdec 100644
--- a/src/strtonum.c
+++ b/src/strtonum.c
@@ -23,6 +23,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
+
 #include "strtonum.h"
 
 #define INVALID 1
diff --git a/src/xmppipe.c b/src/xmppipe.c
index 7d944e5..f4b3119 100644
--- a/src/xmppipe.c
+++ b/src/xmppipe.c
@@ -97,8 +97,8 @@ int main(int argc, char **argv) {
   jid = xmppipe_getenv("XMPPIPE_USERNAME");
   pass = xmppipe_getenv("XMPPIPE_PASSWORD");
 
-  if (xmppipe_sandbox_init(state) < 0)
-    err(EXIT_FAILURE, "sandbox failed");
+  if (xmppipe_restrict_process_init(state) < 0)
+    err(EXIT_FAILURE, "restrict_process failed");
 
   while ((ch = getopt_long(argc, argv, "a:b:c:dDeF:hI:k:K:o:P:p:r:sS:u:U:vx",
                            long_options, NULL)) != -1) {
@@ -264,10 +264,11 @@ int main(int argc, char **argv) {
     errx(EXIT_FAILURE, "XMPP handshake failed");
 
   if (state->verbose)
-    (void)fprintf(stderr, "sandbox: stdin: %s\n", XMPPIPE_SANDBOX);
+    (void)fprintf(stderr, "restrict_process: stdin: %s\n",
+                  XMPPIPE_RESTRICT_PROCESS);
 
-  if (xmppipe_sandbox_stdin(state) < 0)
-    err(EXIT_FAILURE, "sandbox failed");
+  if (xmppipe_restrict_process_stdin(state) < 0)
+    err(EXIT_FAILURE, "restrict_process failed");
 
   if (xmppipe_stream_init(state) < 0)
     errx(EXIT_FAILURE, "enabling stream management failed");
@@ -555,8 +556,8 @@ static long long xmppipe_strtonum(xmppipe_state_t *state, const char *nptr,
 }
 
 static void usage(xmppipe_state_t *state) {
-  (void)fprintf(stderr, "%s %s (using %s sandbox)\n", __progname,
-                XMPPIPE_VERSION, XMPPIPE_SANDBOX);
+  (void)fprintf(stderr, "%s %s (using %s mode process restriction)\n",
+                __progname, XMPPIPE_VERSION, XMPPIPE_RESTRICT_PROCESS);
   (void)fprintf(
       stderr,
       "usage: %s [OPTIONS]\n"
diff --git a/src/xmppipe.h b/src/xmppipe.h
index dc27e81..8386b6e 100644
--- a/src/xmppipe.h
+++ b/src/xmppipe.h
@@ -166,8 +166,8 @@ void xmppipe_stanza_set_text(xmpp_stanza_t *, const char *const);
 void xmppipe_stanza_set_type(xmpp_stanza_t *const, const char *const);
 void xmppipe_stanza_add_child(xmpp_stanza_t *, xmpp_stanza_t *);
 
-int xmppipe_sandbox_init(xmppipe_state_t *state);
-int xmppipe_sandbox_stdin(xmppipe_state_t *state);
+int xmppipe_restrict_process_init(xmppipe_state_t *state);
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state);
 int xmppipe_conn_fd(xmppipe_state_t *state);
 
 int b64_ntop(u_char const *src, size_t srclength, char *target,
diff --git a/src/xmppipe_fmt.c b/src/xmppipe_fmt.c
index f12d0c1..3974b88 100644
--- a/src/xmppipe_fmt.c
+++ b/src/xmppipe_fmt.c
@@ -12,8 +12,8 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#include "xmppipe.h"
 #include "errno.h"
+#include "xmppipe.h"
 
 static unsigned char rfc3986[256];
 
diff --git a/src/xmppipe_sandbox_capsicum.c b/src/xmppipe_restrict_process_capsicum.c
similarity index 91%
rename from src/xmppipe_sandbox_capsicum.c
rename to src/xmppipe_restrict_process_capsicum.c
index efbb17c..1ff8025 100644
--- a/src/xmppipe_sandbox_capsicum.c
+++ b/src/xmppipe_restrict_process_capsicum.c
@@ -12,7 +12,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#ifdef XMPPIPE_SANDBOX_capsicum
+#ifdef XMPPIPE_RESTRICT_PROCESS_capsicum
 #include <sys/capability.h>
 #include <sys/param.h>
 #include <sys/resource.h>
@@ -23,13 +23,13 @@
 
 #include "xmppipe.h"
 
-int xmppipe_sandbox_init(xmppipe_state_t *state) {
+int xmppipe_restrict_process_init(xmppipe_state_t *state) {
   struct rlimit rl = {0};
 
   return setrlimit(RLIMIT_NPROC, &rl);
 }
 
-int xmppipe_sandbox_stdin(xmppipe_state_t *state) {
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state) {
   struct rlimit rl = {0};
   cap_rights_t policy_read;
   cap_rights_t policy_write;
diff --git a/src/xmppipe_sandbox_null.c b/src/xmppipe_restrict_process_null.c
similarity index 82%
rename from src/xmppipe_sandbox_null.c
rename to src/xmppipe_restrict_process_null.c
index 740308a..e1bb315 100644
--- a/src/xmppipe_sandbox_null.c
+++ b/src/xmppipe_restrict_process_null.c
@@ -12,10 +12,10 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#ifdef XMPPIPE_SANDBOX_null
+#ifdef XMPPIPE_RESTRICT_PROCESS_null
 #include "xmppipe.h"
 
-int xmppipe_sandbox_init(xmppipe_state_t *state) { return 0; }
+int xmppipe_restrict_process_init(xmppipe_state_t *state) { return 0; }
 
-int xmppipe_sandbox_stdin(xmppipe_state_t *state) { return 0; }
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state) { return 0; }
 #endif
diff --git a/src/xmppipe_sandbox_pledge.c b/src/xmppipe_restrict_process_pledge.c
similarity index 85%
rename from src/xmppipe_sandbox_pledge.c
rename to src/xmppipe_restrict_process_pledge.c
index 16244f3..16ee5cb 100644
--- a/src/xmppipe_sandbox_pledge.c
+++ b/src/xmppipe_restrict_process_pledge.c
@@ -12,15 +12,15 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#ifdef XMPPIPE_SANDBOX_pledge
+#ifdef XMPPIPE_RESTRICT_PROCESS_pledge
 #include "xmppipe.h"
 #include <unistd.h>
 
-int xmppipe_sandbox_init(xmppipe_state_t *state) {
+int xmppipe_restrict_process_init(xmppipe_state_t *state) {
   return pledge("stdio inet dns rpath", NULL);
 }
 
-int xmppipe_sandbox_stdin(xmppipe_state_t *state) {
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state) {
   return pledge("stdio", NULL);
 }
 #endif
diff --git a/src/xmppipe_sandbox_rlimit.c b/src/xmppipe_restrict_process_rlimit.c
similarity index 81%
rename from src/xmppipe_sandbox_rlimit.c
rename to src/xmppipe_restrict_process_rlimit.c
index 8213f42..b2ab094 100644
--- a/src/xmppipe_sandbox_rlimit.c
+++ b/src/xmppipe_restrict_process_rlimit.c
@@ -12,23 +12,23 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#ifdef XMPPIPE_SANDBOX_rlimit
+#ifdef XMPPIPE_RESTRICT_PROCESS_rlimit
 #include <sys/resource.h>
 #include <sys/time.h>
 
 #include "xmppipe.h"
 
-int xmppipe_sandbox_init(xmppipe_state_t *state) {
+int xmppipe_restrict_process_init(xmppipe_state_t *state) {
   struct rlimit rl_zero = {0};
 
   return setrlimit(RLIMIT_NPROC, &rl_zero);
 }
 
-int xmppipe_sandbox_stdin(xmppipe_state_t *state) {
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state) {
   struct rlimit rl = {0};
 
-  rl.rlim_cur = XMPPIPE_SANDBOX_RLIMIT_NOFILE;
-  rl.rlim_max = XMPPIPE_SANDBOX_RLIMIT_NOFILE;
+  rl.rlim_cur = XMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE;
+  rl.rlim_max = XMPPIPE_RESTRICT_PROCESS_RLIMIT_NOFILE;
 
   if (rl.rlim_cur == (rlim_t)-1) {
     int fd = xmppipe_conn_fd(state);
diff --git a/src/xmppipe_sandbox_seccomp.c b/src/xmppipe_restrict_process_seccomp.c
similarity index 93%
rename from src/xmppipe_sandbox_seccomp.c
rename to src/xmppipe_restrict_process_seccomp.c
index 32a7fc8..98895ea 100644
--- a/src/xmppipe_sandbox_seccomp.c
+++ b/src/xmppipe_restrict_process_seccomp.c
@@ -12,7 +12,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
-#ifdef XMPPIPE_SANDBOX_seccomp
+#ifdef XMPPIPE_RESTRICT_PROCESS_seccomp
 #include <errno.h>
 #include <linux/audit.h>
 #include <linux/filter.h>
@@ -23,16 +23,16 @@
 
 #include "xmppipe.h"
 
-/* macros from openssh-7.2/sandbox-seccomp-filter.c */
+/* macros from openssh-7.2/restrict_process-seccomp-filter.c */
 
-/* Linux seccomp_filter sandbox */
+/* Linux seccomp_filter restrict_process */
 #define SECCOMP_FILTER_FAIL SECCOMP_RET_KILL
 
 /* Use a signal handler to emit violations when debugging */
-#ifdef SANDBOX_SECCOMP_FILTER_DEBUG
+#ifdef RESTRICT_PROCESS_SECCOMP_FILTER_DEBUG
 #undef SECCOMP_FILTER_FAIL
 #define SECCOMP_FILTER_FAIL SECCOMP_RET_TRAP
-#endif /* SANDBOX_SECCOMP_FILTER_DEBUG */
+#endif /* RESTRICT_PROCESS_SECCOMP_FILTER_DEBUG */
 
 /* Simple helpers to avoid manual errors (but larger BPF programs). */
 #define SC_DENY(_nr, _errno)                                                   \
@@ -47,10 +47,9 @@
       BPF_STMT(BPF_LD + BPF_W + BPF_ABS,                                       \
                offsetof(struct seccomp_data, args[(_arg_nr)])),                \
       BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (_arg_val), 0, 1),                   \
-      BPF_STMT(                                                                \
-          BPF_RET + BPF_K, SECCOMP_RET_ALLOW), /* reload syscall number; all   \
-                                                  rules expect it in           \
-                                                  accumulator */               \
+      BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW), /* reload syscall number;  \
+                                                       all rules expect it in                                                            \
+                                                       accumulator */          \
       BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct seccomp_data, nr))
 
 /*
@@ -74,7 +73,7 @@
 #define SECCOMP_AUDIT_ARCH 0
 #endif
 
-int xmppipe_sandbox_init(xmppipe_state_t *state) {
+int xmppipe_restrict_process_init(xmppipe_state_t *state) {
   struct sock_filter filter[] = {
       /* Ensure the syscall arch convention is as expected. */
       BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct seccomp_data, arch)),
@@ -305,7 +304,7 @@ int xmppipe_sandbox_init(xmppipe_state_t *state) {
   return prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
 }
 
-int xmppipe_sandbox_stdin(xmppipe_state_t *state) {
+int xmppipe_restrict_process_stdin(xmppipe_state_t *state) {
   struct sock_filter filter[] = {
       /* Ensure the syscall arch convention is as expected. */
       BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct seccomp_data, arch)),