fix(netbsd): add NetBSD support to daemon IPC and runtime

Extend Linux codepaths in runtime.c to also cover NetBSD, and add
NetBSD-specific peer PID retrieval via LOCAL_PEEREID in ipc.c.

Signed-off-by: Christof Meerwald <cmeerw@cmeerw.org>

Author: cmeerw

src/daemon/ipc.c

@@ -3023,6 +3023,14 @@ uint64_t cbm_daemon_ipc_connection_peer_pid(const cbm_daemon_ipc_connection_t *c
         return 0;
     }
     return (uint64_t)peer_pid;
+#elif defined(SOL_LOCAL) && defined(LOCAL_PEEREID)
+    struct unpcbid peer_id;
+    socklen_t length = sizeof(peer_id);
+    if (getsockopt(connection->fd, SOL_LOCAL, LOCAL_PEEREID, &peer_id, &length) != 0 ||
+        length != sizeof(peer_id) || peer_id.unp_pid <= 0) {
+        return 0;
+    }
+    return (uint64_t)peer_id.unp_pid;
 #else
     return 0;
 #endif

src/daemon/runtime.c

@@ -30,7 +30,7 @@
 #include <sys/proc_info.h>
 #include <sys/stat.h>
 #include <unistd.h>
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__NetBSD__)
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -135,7 +135,7 @@ typedef struct {
     HANDLE file;
     BY_HANDLE_FILE_INFORMATION information;
     LARGE_INTEGER size;
-#elif defined(__APPLE__) || defined(__linux__)
+#elif defined(__APPLE__) || defined(__linux__) || defined(__NetBSD__)
     int fd;
     struct stat status;
 #endif
@@ -490,7 +490,7 @@ static bool runtime_activation_response_decode(
 static uint64_t runtime_current_process_id(void) {
 #ifdef _WIN32
     return (uint64_t)GetCurrentProcessId();
-#elif defined(__APPLE__) || defined(__linux__)
+#elif defined(__APPLE__) || defined(__linux__) || defined(__NetBSD__)
     return (uint64_t)getpid();
 #else
     return 0;
@@ -504,7 +504,7 @@ static void runtime_process_image_reference_init(runtime_process_image_reference
     memset(reference, 0, sizeof(*reference));
 #ifdef _WIN32
     reference->file = INVALID_HANDLE_VALUE;
-#elif defined(__APPLE__) || defined(__linux__)
+#elif defined(__APPLE__) || defined(__linux__) || defined(__NetBSD__)
     reference->fd = -1;
 #endif
 }
@@ -518,7 +518,7 @@ static bool runtime_process_image_reference_release(runtime_process_image_refere
     if (reference->file != INVALID_HANDLE_VALUE && !CloseHandle(reference->file)) {
         ok = false;
     }
-#elif defined(__APPLE__) || defined(__linux__)
+#elif defined(__APPLE__) || defined(__linux__) || defined(__NetBSD__)
     if (reference->fd >= 0 && close(reference->fd) != 0) {
         ok = false;
     }
@@ -658,7 +658,7 @@ static bool runtime_mac_process_maps_file_executable(int process_id, const struc
     return false;
 }
 
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__NetBSD__)
 
 static bool runtime_linux_stat_same_image(const struct stat *first, const struct stat *second) {
     return first && second && S_ISREG(first->st_mode) && S_ISREG(second->st_mode) &&
@@ -753,7 +753,7 @@ static bool runtime_process_image_reference_acquire(
     } else if (fd >= 0) {
         (void)close(fd);
     }
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__NetBSD__)
     char proc_path[64];
     int written =
         snprintf(proc_path, sizeof(proc_path), "/proc/%llu", (unsigned long long)process_id);
@@ -827,7 +827,7 @@ static bool runtime_process_image_reference_matches_process(
            runtime_mac_stat_same(&active->status, &peer.status);
     bool released = runtime_process_image_reference_release(&peer);
     return same && released;
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__NetBSD__)
     runtime_process_image_reference_t peer;
     runtime_process_image_reference_init(&peer);
     bool same = runtime_process_image_reference_acquire(process_id, &peer, NULL);