increase amount of open files for code coverage (#129)

Author: ypopovych

Sources/DatadogSDKTesting/Coverage/DDCoverageHelper.swift

@@ -37,6 +37,7 @@ class DDCoverageHelper {
         coverageWorkQueue = OperationQueue()
         coverageWorkQueue.qualityOfService = .utility
         coverageWorkQueue.maxConcurrentOperationCount = max(ProcessInfo.processInfo.activeProcessorCount - 1, 1)
+        setFileLimit()
     }
 
     func clearCounters() {
@@ -47,6 +48,23 @@ class DDCoverageHelper {
                                  $0.endCountersFuncPtr)
         }
     }
+    
+    private func setFileLimit() {
+        var limit = rlimit()
+        let filesMax = 4096
+        guard getrlimit(RLIMIT_NOFILE, &limit) == 0 else {
+            Log.debug("Can't get open file limit")
+            return
+        }
+        guard limit.rlim_cur < filesMax else { return }
+        limit.rlim_cur = rlim_t(filesMax)
+        limit.rlim_max = rlim_t(filesMax * 8)
+        if setrlimit(RLIMIT_NOFILE, &limit) == 0 {
+            Log.debug("Updated open file limit to \(filesMax)")
+        } else {
+            Log.debug("Can't increase open file limit")
+        }
+    }
 
     func setTest(name: String, testSessionId: UInt64, testSuiteId: UInt64, spanId: UInt64) {
         if !self.initialCoverageSaved {

Sources/EventsExporter/CoverageExporter/CoverageExporter.swift

@@ -63,7 +63,7 @@ internal class CoverageExporter {
         do {
             profData = try DDCoverageConversor.generateProfData(profrawFile: coverage)
         } catch {
-            Log.print("Profiler Data genetation failed: \(error)")
+            Log.print("Profiler Data generation failed: \(error)")
             return
         }
 

Sources/EventsExporter/Utils/Spawn.swift

@@ -51,7 +51,6 @@ public enum Spawn {
 
         var childActions: posix_spawn_file_actions_t?
         dd_posix_spawn_file_actions_init(&childActions)
-        defer { dd_posix_spawn_file_actions_destroy(&childActions) }
 
         let outFile: URL?
         let errFile: URL?
@@ -85,6 +84,8 @@ public enum Spawn {
             dd_posix_spawn(&pid, command, &childActions, nil, argv, nil)
         }
 
+        dd_posix_spawn_file_actions_destroy(&childActions)
+        
         do {
             try _wait(spawn: ret, pid: pid)
         } catch let e as RunErrorCode {