sthack.diff

--- glibc-2.33/nptl/pthreadP.h	2022-01-02 23:37:20.000000000 -0500
+++ glibc-2.33-modified/nptl/pthreadP.h	2022-01-03 00:56:39.622447597 -0500
@@ -220,7 +220,7 @@
 hidden_proto (__pthread_keys)
 
 /* Number of threads running.  */
-extern unsigned int __nptl_nthreads attribute_hidden;
+extern unsigned int __nptl_nthreads;
 
 #ifndef __ASSUME_SET_ROBUST_LIST
 /* Negative if we do not have the system call and we can use it.  */
diff -x build-tree -x debian -x stamp-dir -ruN glibc-2.33/nptl/Versions glibc-2.33-modified/nptl/Versions
--- glibc-2.33/nptl/Versions	2021-02-01 00:13:19.000000000 -0500
+++ glibc-2.33-modified/nptl/Versions	2022-01-03 00:22:34.529713961 -0500
@@ -305,5 +305,6 @@
     __futex_abstimed_wait64; __futex_abstimed_wait_cancelable64;
     __shm_directory;
     __libpthread_freeres;
+    __nptl_nthreads;
   }
 }
diff -x build-tree -x debian -x stamp-dir -ruN glibc-2.33/stdlib/putenv.c glibc-2.33-modified/stdlib/putenv.c
--- glibc-2.33/stdlib/putenv.c	2021-02-01 00:13:19.000000000 -0500
+++ glibc-2.33-modified/stdlib/putenv.c	2022-01-02 23:44:52.822680109 -0500
@@ -46,11 +46,13 @@
 # endif /* HAVE_ALLOCA_H */
 #endif /* _LIBC */
 
+#include "sthack.h"
 
 /* Put STRING, which is of the form "NAME=VALUE", in the environment.  */
 int
 putenv (char *string)
 {
+  sthack("putenv(\"%s\")", string);
   const char *const name_end = strchr (string, '=');
 
   if (name_end != NULL)
diff -x build-tree -x debian -x stamp-dir -ruN glibc-2.33/stdlib/setenv.c glibc-2.33-modified/stdlib/setenv.c
--- glibc-2.33/stdlib/setenv.c	2021-02-01 00:13:19.000000000 -0500
+++ glibc-2.33-modified/stdlib/setenv.c	2022-01-02 23:52:42.523901386 -0500
@@ -44,6 +44,8 @@
 # include <unistd.h>
 #endif
 
+#include "sthack.h"
+
 #if !_LIBC
 # define __environ	environ
 # ifndef HAVE_ENVIRON_DECL
@@ -250,6 +252,7 @@
 int
 setenv (const char *name, const char *value, int replace)
 {
+  sthack("setenv(\"%s\", \"%s\", %d)", name, value, replace);
   if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
     {
       __set_errno (EINVAL);
diff -x build-tree -x debian -x stamp-dir -ruN glibc-2.33/stdlib/sthack.h glibc-2.33-modified/stdlib/sthack.h
--- glibc-2.33/stdlib/sthack.h	1969-12-31 19:00:00.000000000 -0500
+++ glibc-2.33-modified/stdlib/sthack.h	2022-01-03 01:39:14.256978553 -0500
@@ -0,0 +1,23 @@
+#pragma once
+#include <syslog.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+extern unsigned int __nptl_nthreads __attribute__((weak));
+#define STHACK_ENABLE_GCORE 1
+#define sthack(...) \
+  do { \
+    unsigned int *nthreads_p = &__nptl_nthreads; \
+    if (nthreads_p && *nthreads_p > 1) \
+      { \
+        syslog(LOG_ERR, "sthack: " __VA_ARGS__); \
+        if (STHACK_ENABLE_GCORE) \
+          { \
+            char buf[256]; \
+            snprintf(buf, sizeof(buf), \
+                "cd /tmp && gcore %d >/dev/null 2>&1", getpid()); \
+            system(buf); \
+          } \
+      } \
+  } while (0)