From 31e7fe4de0502c6065244d07ebbae7410c7da9f7 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Tue, 29 Mar 2022 12:22:42 +1100
Subject: [PATCH] reaper in C (bbonev)

---
 src/Makefile     | 22 ++++++++++++++++++++++
 src/reaper.c     | 19 +++++++++++++++++++
 src/reaper_nsl.c | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 src/Makefile
 create mode 100644 src/reaper.c
 create mode 100644 src/reaper_nsl.c

diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..82cffb0
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,22 @@
+all: reaper reaperc reapernsl
+
+STRIP?=strip
+
+reaper: reaper.asm
+	fasm $^ -s $@.fas $@
+	chmod a+x $@
+
+reaper.map: reaper
+	./fas2txt.lsp $@.fas > $@.map
+
+reaperc: reaper.c
+	$(CC) -O3 -flto -o $@ $^
+	$(STRIP) $@
+
+reapernsl: reaper_nsl.c
+	#$(CC) -O3 -flto -nostdlib -static -fdata-sections -ffunction-sections -o $@ $^ -Wl,--gc-sections -Wl,--strip-all -Wl,--build-id=none
+	$(CC) -O3 -flto -nostdlib -static -o $@ $^ -Wl,--build-id=none
+	$(STRIP) --remove-section=.comment $@
+
+clean:
+	rm -f reaper reaperc reaper.fas reaper.map reapernsl
diff --git a/src/reaper.c b/src/reaper.c
new file mode 100644
index 0000000..f1c2f9a
--- /dev/null
+++ b/src/reaper.c
@@ -0,0 +1,19 @@
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+
+int main(void) {
+	sigset_t set;
+	siginfo_t status;
+
+	if (getpid()!=1)
+		return 1;
+	sigfillset(&set);
+	sigprocmask(SIG_BLOCK,&set,NULL);
+	memset(&status,0,sizeof status);
+	while (-ECHILD!=waitid(P_ALL,0,&status,WEXITED));
+	return 1;
+}
diff --git a/src/reaper_nsl.c b/src/reaper_nsl.c
new file mode 100644
index 0000000..b788562
--- /dev/null
+++ b/src/reaper_nsl.c
@@ -0,0 +1,36 @@
+//#include <errno.h>
+//#include <signal.h>
+//#include <string.h>
+//#include <unistd.h>
+//#include <sys/wait.h>
+//#include <sys/types.h>
+
+//int main(void) {
+//	sigset_t set;
+//	siginfo_t status;
+//
+//	if (getpid()!=1)
+//		return 1;
+//	sigfillset(&set);
+//	sigprocmask(SIG_BLOCK,&set,NULL);
+//	memset(&status,0,sizeof status);
+//	while (-ECHILD!=waitid(P_ALL,0,&status,WEXITED));
+//	return 1;
+//}
+
+#define _GNU_SOURCE
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <linux/unistd.h>
+
+static inline void nsl_exit1(void) {
+	asm("mov $60,%eax");
+	asm("mov $1,%rdi");
+	asm("syscall");
+}
+
+__attribute__((naked)) void _start(void) {
+	nsl_exit1();
+}
-- 
2.39.2