From 4c91cf7a6e0803fe2ad83d534ff3bcb419410e8a Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Wed, 13 Aug 2025 12:26:10 +0200
Subject: [PATCH] proj: Add perf/

---
 .gitignore                     |  1 +
 proj/intercept/src/intercept.c |  2 +-
 proj/perf/Makefile             | 16 ++++++++++++++++
 proj/perf/main.c               | 33 +++++++++++++++++++++++++++++++++
 proj/perf/test.sh              | 22 ++++++++++++++++++++++
 5 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 proj/perf/Makefile
 create mode 100644 proj/perf/main.c
 create mode 100755 proj/perf/test.sh

diff --git a/.gitignore b/.gitignore
index 4f8bb60..e4db9f5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ bin/
 *.log
 *.pdf
 related-work/
+main
diff --git a/proj/intercept/src/intercept.c b/proj/intercept/src/intercept.c
index 7a95e40..6d70f82 100644
--- a/proj/intercept/src/intercept.c
+++ b/proj/intercept/src/intercept.c
@@ -1240,7 +1240,7 @@ void sym(exit)(int status) {
         char msg_buf[BUFFER_SIZE];
         rcv(msg_buf, sizeof(msg_buf));
         if_modify_int("exit", int, status)
-        else if_invalid(getopt)
+        else if_invalid(exit)
     }
     __real_exit(status);
 }
diff --git a/proj/perf/Makefile b/proj/perf/Makefile
new file mode 100644
index 0000000..ec3ec12
--- /dev/null
+++ b/proj/perf/Makefile
@@ -0,0 +1,16 @@
+
+CC=gcc
+CFLAGS=-std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -D_POSIX_C_SOURCE=200809L -g
+
+.PHONY: all clean
+all: default
+default: main
+
+main.o: main.c
+	$(CC) -c -o $@ $^ $(CFLAGS)
+
+main: main.o
+	$(CC) -o $@ $^ $(CFLAGS) -lc
+
+clean:
+	rm -rf main *.o
diff --git a/proj/perf/main.c b/proj/perf/main.c
new file mode 100644
index 0000000..fa84381
--- /dev/null
+++ b/proj/perf/main.c
@@ -0,0 +1,33 @@
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+int main(const int argc, const char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "usage: main <cycles>\n");
+        return 1;
+    }
+
+    const long cycles = strtol(argv[1], NULL, 10);
+
+    struct timespec start, end;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    int pipes[2];
+    for (int i = 0; i < cycles; i++) {
+        if (pipe(pipes) != 0) {
+            fprintf(stderr, "unable to create pipes: %s\n", strerror(errno));
+            exit(1);
+        }
+        close(pipes[0]);
+        close(pipes[1]);
+    }
+
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    const long duration = end.tv_sec * 1000000000 + end.tv_nsec - start.tv_sec * 1000000000 - start.tv_nsec;
+    printf("start: %li.%09li\nend:   %li.%09li\nduration: %li,%03li,%03li ns\n", start.tv_sec, start.tv_nsec, end.tv_sec, end.tv_nsec, duration / 1000000, duration / 1000 % 1000, duration % 1000);
+}
diff --git a/proj/perf/test.sh b/proj/perf/test.sh
new file mode 100755
index 0000000..e98cd13
--- /dev/null
+++ b/proj/perf/test.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+REPEAT=30
+CYCLES=50
+
+function test() {
+  echo $@
+  for c in $(seq 1 $CYCLES); do
+    for i in $(seq 1 $REPEAT); do
+      echo "cycles: $((c * 100)) ($i/$REPEAT)"
+      $@ $((c * 100))
+      sleep 1
+    done
+  done
+}
+
+test ./main
+cd ../intercept
+test ./intercept -o -i - -- ../perf/main
+test ./intercept -o -i stderr -- ../perf/main
+test ./intercept -o -i file:out.log -- ../perf/main
+#test ./intercept -o -i unix:/ -- ../perf/main