[DNM] debug macos hang

.github/workflows/ci.yml

@@ -4,6 +4,7 @@ on: [push, pull_request]
 
 jobs:
   linux:
+    if: false
     name: Linux
 
     runs-on: ubuntu-latest
@@ -56,13 +57,15 @@ jobs:
 
       - name: Run tests
         run: |
+          export DYLD_FORCE_FLAT_NAMESPACE=1
           jobs=$(sysctl -n hw.ncpu)
-          make -j$jobs distcheck JOBS=-j$jobs
+          make -j$jobs
+          ./bin/bfs bin -exec true {} \;
 
   freebsd:
     name: FreeBSD
 
-    if: ${{ github.repository_owner == 'tavianator' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
+    if: ${{ false && github.repository_owner == 'tavianator' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
 
     runs-on: ubuntu-latest
 

.github/workflows/codecov.yml

@@ -4,6 +4,7 @@ on: [push]
 
 jobs:
   build:
+    if: false
     runs-on: ubuntu-latest
 
     steps:

.github/workflows/codeql.yml

@@ -12,6 +12,7 @@ on:
 
 jobs:
   analyze:
+    if: false
     name: Analyze
     runs-on: ubuntu-latest
     permissions:

src/xspawn.c

@@ -3,6 +3,7 @@
 
 #include "xspawn.h"
 #include "alloc.h"
+#include "atomic.h"
 #include "bfstd.h"
 #include "config.h"
 #include "list.h"
@@ -19,6 +20,45 @@
 #  include <paths.h>
 #endif
 
+#include "thread.h"
+#include <execinfo.h>
+
+static void *bfs_calloc(size_t count, size_t size) {
+	static atomic pid_t apid = 0;
+	pid_t pid = load(&apid, relaxed);
+	if (pid == 0) {
+		store(&apid, getpid(), relaxed);
+	} else {
+		bfs_verify(pid == getpid());
+	}
+
+	static thread_local bool reintr = false;
+	if (!reintr) {
+		reintr = true;
+		void *stack[128];
+		int frames = backtrace(stack, countof(stack));
+		backtrace_symbols_fd(stack, frames, STDERR_FILENO);
+		write(STDERR_FILENO, "---\n", 4);
+		reintr = false;
+	}
+
+	size = array_size(1, size, count);
+	void *ptr = malloc(size);
+	if (ptr) {
+		memset(ptr, 0, size);
+	}
+	return ptr;
+}
+
+__attribute__((used))
+__attribute__((section("__DATA, __interpose")))
+static const struct {
+	void *new_fn;
+	void *old_fn;
+} interposed[] = {
+	{ (void *)bfs_calloc, (void *)calloc },
+};
+
 /**
  * Types of spawn actions.
  */