works, need to add tests

slsReceiverSoftware/src/CommandLineOptions.cpp

@@ -7,6 +7,11 @@
 #include "sls/ToString.h"
 #include "sls/logger.h"
 
+#include <csignal>
+#include <cstring>
+#include <getopt.h>
+#include <unistd.h>
+
 #define MAX_RECEIVERS 1024
 
 ParsedOptions parseCommandLine(AppType app, int argc, char* argv[]) {
@@ -108,7 +113,7 @@ ParsedOptions parseCommandLine(AppType app, int argc, char* argv[]) {
                         multi.numReceivers = sls::StringTo<uint16_t>(optarg);
                     else if (app == AppType::FrameSynchronizer)
                         frame.numReceivers = sls::StringTo<uint16_t>(optarg);
-                    if (numReceivers < 0 || numReceivers > MAX_RECEIVERS) {
+                    if (numReceivers == 0 || numReceivers > MAX_RECEIVERS) {
                         throw sls::RuntimeError("Invalid number of receivers. Max: "   + std::to_string(MAX_RECEIVERS));
                     }
                     multi.numReceivers = numReceivers;
@@ -257,4 +262,16 @@ std::string getHelpMessage(AppType app) {
             "\t-u, --uid           : Set effective user id if receiver started "
             "with privileges. \n\n";
     }
+    throw sls::RuntimeError("Unknown AppType for help message");
+}
+
+void setupSignalHandler(int signal, void (*handler)(int)) {
+    // Catch signal SIGINT to close files and call destructors properly
+    struct sigaction sa{};
+    sa.sa_handler = handler;
+    sigemptyset(&sa.sa_mask); // dont block additional signals
+    sa.sa_flags = 0;
+    if (sigaction(signal, &sa, nullptr) == -1) {
+        LOG(sls::logERROR) << "Could not set handler for " << strsignal(signal);
+    }
 }

slsReceiverSoftware/src/CommandLineOptions.h

@@ -2,12 +2,9 @@
 // Copyright (C) 2021 Contributors to the SLS Detector Package
 #pragma once
 
-
-
-#include <variant>
-#include <getopt.h>
-#include <unistd.h>
 #include <cstdint>
+#include <string>
+#include <variant>
 
 enum class AppType {
     MultiReceiver,
@@ -41,4 +38,4 @@ void setEffectiveUID(uid_t uid);
 std::string getTypeString(const AppType app);
 std::string getVersion(AppType app);
 std::string getHelpMessage(AppType app);
-
+void setupSignalHandler(int signal, void (*handler)(int));

slsReceiverSoftware/src/FrameSynchronizerApp.cpp

@@ -5,12 +5,12 @@
  * reconstructing image. Sample python script for pull socket for this combiner
  * in python/scripts folder. TODO: Not handling empty frames from one socket
  */
+#include "CommandLineOptions.h"
 #include "sls/Receiver.h"
 #include "sls/ToString.h"
 #include "sls/container_utils.h"
 #include "sls/logger.h"
 #include "sls/sls_detector_defs.h"
-#include "CommandLineOptions.h"
 
 #include <csignal> //SIGINT
 #include <cstdio>
@@ -28,7 +28,6 @@
 #include <zmq.h>
 
 std::vector<std::thread> threads;
-std::vector<sem_t *> semaphores;
 sls::TLogLevel printHeadersLevel = sls::logDEBUG;
 
 /** Define Colors to print data call back in different colors for different
@@ -57,16 +56,6 @@ struct FrameStatus {
 };
 FrameStatus *global_frame_status = nullptr;
 
-/**
- * Control+C Interrupt Handler
- * to let all the processes know to exit properly
- */
-void sigInterruptHandler(int p) {
-    for (size_t i = 0; i != semaphores.size(); ++i) {
-        sem_post(semaphores[i]);
-    }
-}
-
 void cleanup() {
     if (global_frame_status) {
         std::lock_guard<std::mutex> lock(global_frame_status->mtx);
@@ -499,38 +488,37 @@ void GetDataCallback(slsDetectorDefs::sls_receiver_header &header,
     sem_post(&stat->available);
 }
 
+std::vector<sem_t> semaphores;
+
+/**
+ * Control+C Interrupt Handler
+ * to let all the processes know to exit properly
+ * Only the main thread will call this handler
+ */
+void sigInterruptHandler(int p) {
+    (void)signal; // suppress unused warning if needed
+    for (auto &s : semaphores) {
+        sem_post(&s);
+    }
+}
+
 int main(int argc, char *argv[]) {
     auto opts = parseCommandLine(AppType::MultiReceiver, argc, argv);
-    auto& o = std::get<CommonOptions>(opts);
+    auto &o = std::get<CommonOptions>(opts);
+    auto &f = std::get<FrameSyncOptions>(opts);
     if (o.versionRequested || o.helpRequested) {
         return EXIT_SUCCESS;
     }
 
     LOG(sls::logINFOBLUE) << "Current Process [ Tid: " << gettid() << ']';
 
-    /** - Catch signal SIGINT to close files and call destructors properly */
+    setupSignalHandler(SIGINT, sigInterruptHandler); // close files on ctrl+c
-    struct sigaction sa;
+    setupSignalHandler(SIGPIPE, SIG_IGN); // handle locally on socket crash
-    sa.sa_flags = 0;                     // no flags
+    semaphores.resize(f.numReceivers);
-    sa.sa_handler = sigInterruptHandler; // handler function
+    for (auto &s : semaphores) {
-    sigemptyset(&sa.sa_mask); // dont block additional signals during invocation
+        sem_init(&s, 1, 0);
-                              // of handler
-    if (sigaction(SIGINT, &sa, nullptr) == -1) {
-        cprintf(RED, "Could not set handler function for SIGINT\n");
     }
 
-    /** - Ignore SIG_PIPE, prevents global signal handler, handle locally,
-       instead of a server crashing due to client crash when writing, it just
-       gives error */
-    struct sigaction asa;
-    asa.sa_flags = 0;          // no flags
-    asa.sa_handler = SIG_IGN;  // handler function
-    sigemptyset(&asa.sa_mask); // dont block additional signals during
-                               // invocation of handler
-    if (sigaction(SIGPIPE, &asa, nullptr) == -1) {
-        cprintf(RED, "Could not set handler function for SIGPIPE\n");
-    }
-
-    auto& f = std::get<FrameSyncOptions>(opts);
     FrameStatus stat{true, false, f.numReceivers};
     // store pointer for signal handler
     global_frame_status = &stat;
@@ -540,11 +528,8 @@ int main(int argc, char *argv[]) {
     std::thread combinerThread(Correlate, &stat);
 
     for (int i = 0; i != f.numReceivers; ++i) {
-        sem_t *semaphore = new sem_t;
-        sem_init(semaphore, 1, 0);
-        semaphores.push_back(semaphore);
-
         uint16_t port = o.port + i;
+        sem_t *semaphore = &semaphores[i];
         threads.emplace_back([i, semaphore, port, user_data]() {
             sls::Receiver receiver(port);
             receiver.registerCallBackStartAcquisition(StartAcquisitionCallback,
@@ -552,10 +537,11 @@ int main(int argc, char *argv[]) {
             receiver.registerCallBackAcquisitionFinished(
                 AcquisitionFinishedCallback, user_data);
             receiver.registerCallBackRawDataReady(GetDataCallback, user_data);
+
             /**	- as long as no Ctrl+C */
+            // each child shares the common semaphore
             sem_wait(semaphore);
             sem_destroy(semaphore);
-            delete semaphore;
 
             // clean up frames
             if (i == 0)
@@ -563,8 +549,8 @@ int main(int argc, char *argv[]) {
         });
     }
 
-    for (auto &thread : threads) {
+    for (auto &t : threads) {
-        thread.join();
+        t.join();
     }
 
     {

slsReceiverSoftware/src/MultiReceiverApp.cpp

@@ -2,12 +2,12 @@
 // Copyright (C) 2021 Contributors to the SLS Detector Package
 /* Creates the slsMultiReceiver for running multiple receivers form a single
  * binary */
+#include "CommandLineOptions.h"
 #include "sls/Receiver.h"
 #include "sls/ToString.h"
 #include "sls/container_utils.h"
 #include "sls/logger.h"
 #include "sls/sls_detector_defs.h"
-#include "CommandLineOptions.h"
 
 #include <csignal> //SIGINT
 #include <cstring>
@@ -26,8 +26,6 @@
 #define PRINT_IN_COLOR(c, f, ...)                                              \
     printf("\033[%dm" f RESET, 30 + c + 1, ##__VA_ARGS__)
 
-sem_t semaphore;
-
 /**
  * Start Acquisition Call back (slsMultiReceiver writes data if file write
  * enabled) if registerCallBackRawDataReady or
@@ -131,49 +129,34 @@ void GetData(slsDetectorDefs::sls_receiver_header &header,
     // imageSize = 26000;
 }
 
+sem_t semaphore;
+
 /**
  * Control+C Interrupt Handler
  * to let all the processes know to exit properly
+ * All child processes will call the handler (parent process set to ignore)
  */
-void sigInterruptHandler(int p) { sem_post(&semaphore); }
+void sigInterruptHandler(int signal) {
-
+    (void)signal; // suppress unused warning if needed
-
+    sem_post(&semaphore);
+}
 
 int main(int argc, char *argv[]) {
 
     auto opts = parseCommandLine(AppType::MultiReceiver, argc, argv);
     auto& o = std::get<CommonOptions>(opts);
+    auto &m = std::get<MultiReceiverOptions>(opts);
     if (o.versionRequested || o.helpRequested) {
         return EXIT_SUCCESS;
     }
 
     LOG(sls::logINFOBLUE) << "Current Process [ Tid: " << gettid() << ']';
 
-    /** - Catch signal SIGINT to close files and call destructors properly */
+    setupSignalHandler(SIGINT, sigInterruptHandler); // close files on ctrl+c
-    struct sigaction sa;
+    setupSignalHandler(SIGPIPE, SIG_IGN); // handle locally on socket crash
-    sa.sa_flags = 0;                     // no flags
-    sa.sa_handler = sigInterruptHandler; // handler function
-    sigemptyset(&sa.sa_mask); // dont block additional signals during invocation
-                              // of handler
-    if (sigaction(SIGINT, &sa, nullptr) == -1) {
-        LOG(sls::logERROR) << "Could not set handler function for SIGINT";
-    }
-
-    /** - Ignore SIG_PIPE, prevents global signal handler, handle locally,
-       instead of a server crashing due to client crash when writing, it just
-       gives error */
-    struct sigaction asa;
-    asa.sa_flags = 0;          // no flags
-    asa.sa_handler = SIG_IGN;  // handler function
-    sigemptyset(&asa.sa_mask); // dont block additional signals during
-                               // invocation of handler
-    if (sigaction(SIGPIPE, &asa, nullptr) == -1) {
-        LOG(sls::logERROR) << "Could not set handler function for SIGPIPE";
-    }
-
-    /** - loop over number of receivers */
     sem_init(&semaphore, 1, 0);
-    auto& m = std::get<MultiReceiverOptions>(opts);
+
+    /** - loop over receivers */
     for (int i = 0; i < m.numReceivers; ++i) {
 
         /**	- fork process to create child process */
@@ -218,6 +201,7 @@ int main(int argc, char *argv[]) {
                 }
 
                 /**	- as long as no Ctrl+C */
+                // each child process gets a copy of the semaphore
                 sem_wait(&semaphore);
                 sem_destroy(&semaphore);
 
@@ -233,15 +217,9 @@ int main(int argc, char *argv[]) {
         }
     }
 
-    /** - Parent process ignores SIGINT (exits only when all child process
+    /** - Parent process ignores SIGINT and waits for all the child processes to
-     * exits) */
+     * handle the signal */
-    sa.sa_flags = 0;          // no flags
+    setupSignalHandler(SIGINT, SIG_IGN);
-    sa.sa_handler = SIG_IGN;  // handler function
-    sigemptyset(&sa.sa_mask); // dont block additional signals during invocation
-                              // of handler
-    if (sigaction(SIGINT, &sa, nullptr) == -1) {
-        LOG(sls::logERROR) << "Could not set handler function for SIGINT";
-    }
 
     /** - Print Ready and Instructions how to exit */
     std::cout << "Ready ... \n";

slsReceiverSoftware/src/ReceiverApp.cpp

@@ -1,12 +1,12 @@
 // SPDX-License-Identifier: LGPL-3.0-or-other
 // Copyright (C) 2021 Contributors to the SLS Detector Package
 /* slsReceiver */
+#include "CommandLineOptions.h"
 #include "sls/Receiver.h"
 #include "sls/ToString.h"
 #include "sls/container_utils.h"
 #include "sls/logger.h"
 #include "sls/sls_detector_defs.h"
-#include "CommandLineOptions.h"
 
 #include <csignal> //SIGINT
 #include <semaphore.h>
@@ -20,7 +20,14 @@
 
 sem_t semaphore;
 
-void sigInterruptHandler(int p) { sem_post(&semaphore); }
+/**
+ * Control+C Interrupt Handler
+ * to let all the other process know to exit properly
+ */
+void sigInterruptHandler(int signal) {
+    (void)signal; // suppress unused warning if needed
+    sem_post(&semaphore);
+}
 
 int main(int argc, char *argv[]) {
 
@@ -32,28 +39,10 @@ int main(int argc, char *argv[]) {
 
     LOG(sls::logINFOBLUE) << "Current Process [ Tid: " << gettid() << " ]";
 
-    // Catch signal SIGINT to close files and call destructors properly
+    setupSignalHandler(SIGINT, sigInterruptHandler); // close files on ctrl+c
-    struct sigaction sa;
+    setupSignalHandler(SIGPIPE, SIG_IGN); // handle locally on socket crash
-    sa.sa_flags = 0;                     // no flags
-    sa.sa_handler = sigInterruptHandler; // handler function
-    sigemptyset(&sa.sa_mask); // dont block additional signals during invocation
-                              // of handler
-    if (sigaction(SIGINT, &sa, nullptr) == -1) {
-        LOG(sls::logERROR) << "Could not set handler function for SIGINT";
-    }
-
-    // if socket crash, ignores SISPIPE, prevents global signal handler
-    // subsequent read/write to socket gives error - must handle locally
-    struct sigaction asa;
-    asa.sa_flags = 0;          // no flags
-    asa.sa_handler = SIG_IGN;  // handler function
-    sigemptyset(&asa.sa_mask); // dont block additional signals during
-                               // invocation of handler
-    if (sigaction(SIGPIPE, &asa, nullptr) == -1) {
-        LOG(sls::logERROR) << "Could not set handler function for SIGPIPE";
-    }
-
     sem_init(&semaphore, 1, 0);
+
     try {
         sls::Receiver r(o.port);
         LOG(sls::logINFO) << "[ Press \'Ctrl+c\' to exit ]";

slsReceiverSoftware/tests/CMakeLists.txt

@@ -4,6 +4,7 @@ target_sources(tests PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}/test-GeneralData.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test-CircularFifo.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test-ArrangeDataBasedOnBitList.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test-Apps.cpp
 )
 
 target_include_directories(tests PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../src>")