Avoid exceptions

src/connection_registry.cpp

@@ -1,15 +1,16 @@
 #include "connection_registry.hpp"
 #include "connection.hpp"
 #include <atomic>
+#include <cstdlib>
 #include <cstring>
-#include <stdexcept>
 #include <unistd.h>
 
 ConnectionRegistry::ConnectionRegistry() : connections_(nullptr), max_fds_(0) {
   // Get the process file descriptor limit
   struct rlimit rlim;
   if (getrlimit(RLIMIT_NOFILE, &rlim) == -1) {
-    throw std::runtime_error("Failed to get RLIMIT_NOFILE");
+    perror("getrlimit");
+    std::abort();
   }
   max_fds_ = rlim.rlim_cur;
 
@@ -25,7 +26,8 @@ ConnectionRegistry::ConnectionRegistry() : connections_(nullptr), max_fds_(0) {
            MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
 
   if (connections_ == MAP_FAILED) {
-    throw std::runtime_error("Failed to mmap for connection registry");
+    perror("mmap");
+    std::abort();
   }
 
   // Store aligned size for munmap

src/connection_registry.hpp

@@ -22,7 +22,7 @@ public:
    * Initialize the connection registry.
    * Allocates virtual address space based on RLIMIT_NOFILE.
    *
-   * @throws std::runtime_error if mmap fails or RLIMIT_NOFILE cannot be read
+   * Aborts the process if mmap fails or RLIMIT_NOFILE cannot be read
    */
   ConnectionRegistry();
 

src/main.cpp

@@ -37,7 +37,7 @@ std::vector<int> create_listen_sockets(const weaseldb::Config &config) {
     int sfd = socket(AF_UNIX, SOCK_STREAM, 0);
     if (sfd == -1) {
       perror("socket");
-      throw std::runtime_error("Failed to create unix socket");
+      std::abort();
     }
 
     // Remove existing socket file if it exists
@@ -49,7 +49,8 @@ std::vector<int> create_listen_sockets(const weaseldb::Config &config) {
 
     if (config.server.unix_socket_path.length() >= sizeof(addr.sun_path)) {
       close(sfd);
-      throw std::runtime_error("Unix socket path too long");
+      std::fprintf(stderr, "Unix socket path too long\n");
+      std::abort();
     }
 
     strncpy(addr.sun_path, config.server.unix_socket_path.c_str(),
@@ -58,13 +59,13 @@ std::vector<int> create_listen_sockets(const weaseldb::Config &config) {
     if (bind(sfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
       perror("bind");
       close(sfd);
-      throw std::runtime_error("Failed to bind unix socket");
+      std::abort();
     }
 
     if (listen(sfd, SOMAXCONN) == -1) {
       perror("listen");
       close(sfd);
-      throw std::runtime_error("Failed to listen on unix socket");
+      std::abort();
     }
 
     listen_fds.push_back(sfd);
@@ -89,7 +90,7 @@ std::vector<int> create_listen_sockets(const weaseldb::Config &config) {
                   std::to_string(config.server.port).c_str(), &hints, &result);
   if (s != 0) {
     fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
-    throw std::runtime_error("Failed to resolve bind address");
+    std::abort();
   }
 
   int sfd = -1;
@@ -126,13 +127,14 @@ std::vector<int> create_listen_sockets(const weaseldb::Config &config) {
   freeaddrinfo(result);
 
   if (rp == nullptr || sfd == -1) {
-    throw std::runtime_error("Could not bind to any address");
+    std::fprintf(stderr, "Could not bind to any address\n");
+    std::abort();
   }
 
   if (listen(sfd, SOMAXCONN) == -1) {
     perror("listen");
     close(sfd);
-    throw std::runtime_error("Failed to listen on socket");
+    std::abort();
   }
 
   listen_fds.push_back(sfd);
@@ -236,13 +238,7 @@ int main(int argc, char *argv[]) {
             << std::endl;
 
   // Create listen sockets
-  std::vector<int> listen_fds;
+  std::vector<int> listen_fds = create_listen_sockets(*config);
-  try {
-    listen_fds = create_listen_sockets(*config);
-  } catch (const std::exception &e) {
-    std::cerr << "Failed to create listen sockets: " << e.what() << std::endl;
-    return 1;
-  }
 
   // Create handler and server
   HttpHandler http_handler;

src/server.cpp

@@ -9,7 +9,6 @@
 #include <netdb.h>
 #include <netinet/tcp.h>
 #include <pthread.h>
-#include <stdexcept>
 #include <sys/epoll.h>
 #include <sys/socket.h>
 #include <sys/un.h>
@@ -39,12 +38,12 @@ Server::Server(const weaseldb::Config &config, ConnectionHandler &handler,
   for (int fd : listen_fds_) {
     int flags = fcntl(fd, F_GETFL, 0);
     if (flags == -1) {
-      perror("fcntl F_GETFL on provided listen fd");
+      perror("fcntl F_GETFL");
-      throw std::runtime_error("Failed to get flags for provided listen fd");
+      std::abort();
     }
     if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
-      perror("fcntl F_SETFL O_NONBLOCK on provided listen fd");
+      perror("fcntl F_SETFL O_NONBLOCK");
-      throw std::runtime_error("Failed to set provided listen fd non-blocking");
+      std::abort();
     }
   }
 
@@ -179,14 +178,14 @@ int Server::createLocalConnection() {
 
   int flags = fcntl(server_fd, F_GETFL, 0);
   if (flags == -1) {
-    perror("fcntl F_GETFL on provided listen fd");
+    std::fprintf(stderr,
-    throw std::runtime_error(
+                 "Server::createLocalConnection: fcntl F_GETFL failed\n");
-        "Failed to get flags for server side of local connection");
+    std::abort();
   }
   if (fcntl(server_fd, F_SETFL, flags | O_NONBLOCK) == -1) {
-    perror("fcntl F_SETFL O_NONBLOCK on provided listen fd");
+    std::fprintf(stderr,
-    throw std::runtime_error(
+                 "Server::createLocalConnection: fcntl F_SETFL failed\n");
-        "Failed to set server side of local connection to non-blocking");
+    std::abort();
   }
 
   // Create sockaddr_storage for the connection
@@ -226,14 +225,14 @@ int Server::createLocalConnection() {
 void Server::setup_shutdown_pipe() {
   if (pipe(shutdown_pipe_) == -1) {
     perror("pipe");
-    throw std::runtime_error("Failed to create shutdown pipe");
+    std::abort();
   }
 
   // Set both ends to close-on-exec
   if (fcntl(shutdown_pipe_[0], F_SETFD, FD_CLOEXEC) == -1 ||
       fcntl(shutdown_pipe_[1], F_SETFD, FD_CLOEXEC) == -1) {
     perror("fcntl FD_CLOEXEC");
-    throw std::runtime_error("Failed to set close-on-exec for shutdown pipe");
+    std::abort();
   }
 }
 
@@ -244,8 +243,8 @@ void Server::create_epoll_instances() {
   for (int i = 0; i < config_.server.epoll_instances; ++i) {
     epoll_fds_[i] = epoll_create1(EPOLL_CLOEXEC);
     if (epoll_fds_[i] == -1) {
-      perror("epoll_create");
+      perror("epoll_create1");
-      throw std::runtime_error("Failed to create epoll instance");
+      std::abort();
     }
 
     // Add shutdown pipe to each epoll instance
@@ -256,7 +255,7 @@ void Server::create_epoll_instances() {
     if (epoll_ctl(epoll_fds_[i], EPOLL_CTL_ADD, shutdown_pipe_[0],
                   &shutdown_event) == -1) {
       perror("epoll_ctl shutdown pipe");
-      throw std::runtime_error("Failed to add shutdown pipe to epoll");
+      std::abort();
     }
 
     // Add all listen sockets to each epoll instance with EPOLLEXCLUSIVE to
@@ -268,7 +267,7 @@ void Server::create_epoll_instances() {
       if (epoll_ctl(epoll_fds_[i], EPOLL_CTL_ADD, listen_fd, &listen_event) ==
           -1) {
         perror("epoll_ctl listen socket");
-        throw std::runtime_error("Failed to add listen socket to epoll");
+        std::abort();
       }
     }
   }

src/server.hpp

@@ -66,7 +66,7 @@ struct Server : std::enable_shared_from_this<Server> {
    * - Starts all worker threads
    * - Blocks until shutdown() is called or an error occurs
    *
-   * @throws std::runtime_error on socket creation or configuration errors
+   * Aborts the process on socket creation or configuration errors
    */
   void run();
 

style.md

@@ -301,8 +301,7 @@ arena.reset();  // Reset arena memory
 
 ### Error Reporting
 - **Return codes** for expected errors
-- **Exceptions** only for exceptional circumstances
+- **Avoid exceptions** - If we can't uphold the component's contract, perror/fprintf then abort. If we want to try to recover, change the component's contract to allow returning an error code.
-- **fprintf + abort()** for unrecoverable errors
 - **Error messages are for humans only** - never parse error message strings programmatically
 - **Error codes are the contract** - use enums/codes for programmatic error handling
 ```cpp
@@ -317,9 +316,13 @@ if (result == ParseResult::InvalidJson) {
 // Bad: Don't test or parse error message strings
 // CHECK(parser.get_error() == "Expected '}' at line 5");  // BRITTLE!
 
-if (!memory) {
+// System resource failures: abort immediately
-  std::fprintf(stderr, "ArenaAllocator: Failed to allocate memory\n");
+void ArenaAllocator::allocate() {
-  std::abort();
+  void* memory = malloc(size);
+  if (!memory) {
+    perror("malloc");
+    std::abort();  // Process is likely in bad state
+  }
 }
 ```