replay: increase file descriptor limit macOS (#29346)

* Increase file descriptor limit for replay on macos

* Reword comment

* Move set_file_descriptor_limit to common/util.cc

* Include resource.h header

common/util.cc

@@ -2,6 +2,7 @@
 
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/resource.h>
 #include <dirent.h>
 
 #include <cassert>
@@ -60,6 +61,20 @@ int set_core_affinity(std::vector<int> cores) {
 #endif
 }
 
+int set_file_descriptor_limit(uint64_t limit_val) {
+  struct rlimit limit;
+  int status;
+
+  if ((status = getrlimit(RLIMIT_NOFILE, &limit)) < 0)
+    return status;
+
+  limit.rlim_cur = limit_val;
+  if ((status = setrlimit(RLIMIT_NOFILE, &limit)) < 0)
+    return status;
+
+  return 0;
+}
+
 std::string read_file(const std::string& fn) {
   std::ifstream f(fn, std::ios::binary | std::ios::in);
   if (f.is_open()) {

common/util.h

@@ -44,6 +44,7 @@ namespace util {
 void set_thread_name(const char* name);
 int set_realtime_priority(int level);
 int set_core_affinity(std::vector<int> cores);
+int set_file_descriptor_limit(uint64_t limit);
 
 // ***** Time helpers *****
 struct tm get_time();

tools/replay/main.cc

@@ -6,6 +6,11 @@
 #include "tools/replay/replay.h"
 
 int main(int argc, char *argv[]) {
+#ifdef __APPLE__
+  // With all sockets opened, we might hit the default limit of 256 on macOS
+  util::set_file_descriptor_limit(1024);
+#endif
+
   QCoreApplication app(argc, argv);
 
   const QStringList base_blacklist = {"uiDebug", "userFlag"};