From 269caa8ae18eb33e1286e4c21d434ea07228a619 Mon Sep 17 00:00:00 2001
From: johannst <johannst@users.noreply.github.com>
Date: Wed, 10 Apr 2024 19:37:02 +0000
Subject: deploy: ae498864bb638e597b589c52ff27237835625281
---
development/ldso/samename/Makefile | 13 +++++++++++++
development/ldso/samename/lib.c | 9 +++++++++
development/ldso/samename/main.c | 36 ++++++++++++++++++++++++++++++++++++
3 files changed, 58 insertions(+)
create mode 100644 development/ldso/samename/Makefile
create mode 100644 development/ldso/samename/lib.c
create mode 100644 development/ldso/samename/main.c
(limited to 'development/ldso')
diff --git a/development/ldso/samename/Makefile b/development/ldso/samename/Makefile
new file mode 100644
index 0000000..f35a1e3
--- /dev/null
+++ b/development/ldso/samename/Makefile
@@ -0,0 +1,13 @@
+all:
+ mkdir -p foo bar
+ gcc -g -o foo/lib.so lib.c -shared -fPIC -DNAME=\"foo\"
+ gcc -g -o bar/lib.so lib.c -shared -fPIC -DNAME=\"bar\"
+ gcc -g -o main main.c -ldl
+ ./main foo/lib.so bar/lib.so
+ LD_LIBRARY_PATH=foo:bar ./main lib.so lib.so
+ LD_LIBRARY_PATH=bar:foo ./main lib.so lib.so
+ LD_LIBRARY_PATH=foo ./main lib.so foo/lib.so
+ LD_LIBRARY_PATH=foo ./main lib.so bar/lib.so
+
+clean:
+ $(RM) -r foo bar main
diff --git a/development/ldso/samename/lib.c b/development/ldso/samename/lib.c
new file mode 100644
index 0000000..d467d7f
--- /dev/null
+++ b/development/ldso/samename/lib.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+#ifndef NAME
+#define NAME __FILE_NAME__
+#endif
+
+void moose() {
+ puts(NAME " says moose");
+}
diff --git a/development/ldso/samename/main.c b/development/ldso/samename/main.c
new file mode 100644
index 0000000..6d6a8ea
--- /dev/null
+++ b/development/ldso/samename/main.c
@@ -0,0 +1,36 @@
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+
+void print_libso() {
+ FILE* m = fopen("/proc/self/maps", "r");
+ assert(m);
+
+ char line[256];
+ while (fgets(line, sizeof(line), m)) {
+ if (strstr(line, "lib.so")) {
+ printf("%s", line);
+ }
+ }
+ fclose(m);
+}
+
+int main(int argc, char* argv[]) {
+ for (int i = 1; i < argc; ++i) {
+ void* h = dlopen(argv[i], RTLD_LAZY | RTLD_GLOBAL);
+ if (!h) {
+ puts(dlerror());
+ return 1;
+ }
+
+ void (*next)() = dlsym(h, "moose");
+ assert(next);
+ next();
+
+ // leak lib, we want to priint the mmap.
+ }
+
+ print_libso();
+ return 0;
+}
--
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