Fixed DragonFly BSD shared memory implementation.

Author: igorsysoev

auto/os/conf

@@ -167,6 +167,26 @@ case "$NXT_SYSTEM" in
         NXT_LIBS="$NXT_PTHREAD"
     ;;
 
+    DragonFly)
+        nxt_have=NXT_DRAGONFLY . auto/have
+
+        NXT_STATIC_LINK="ar -r -c"
+        NXT_SHARED_LINK="\$(CC) -shared"
+        NXT_SHARED_LOCAL_LINK="\$(CC) -shared"
+        NXT_MODULE_LINK="\$(CC) -shared"
+
+        # "-Wl,-E" exports symbols of executable file.
+        NXT_EXEC_LINK="\$(CC) -Wl,-E"
+        NXT_SHARED_LOCAL_EXEC_LINK=
+
+        NXT_LIB_STATIC="libnxt.a"
+        NXT_LIB_SHARED="libnxt.so"
+        NXT_LIB_SHARED_LOCAL="$NXT_BUILD_DIR/libnxt.so"
+
+        NXT_LIBM="-lm"
+        NXT_LIBS="$NXT_LIBRT $NXT_PTHREAD"
+    ;;
+
     AIX)
         nxt_have=NXT_AIX . auto/have
 

auto/os/test

@@ -16,7 +16,7 @@ case "$NXT_SYSTEM" in
         CC=${CC:-cc}
         ;;
 
-    FreeBSD | NetBSD | OpenBSD)
+    FreeBSD | NetBSD | OpenBSD | DragonFly)
         NXT_SYSTEM_VERSION=`uname -r 2>/dev/null`
         NXT_SYSTEM_PLATFORM=`uname -m 2>/dev/null`
         echo=echo

auto/shmem

@@ -3,6 +3,8 @@
 # Copyright (C) NGINX, Inc.
 
 
+NXT_SHM_PREFIX="/"
+
 # FreeBSD, Solaris, MacOSX
 
 nxt_feature="shm_open()"
@@ -12,10 +14,12 @@ nxt_feature_incs=
 nxt_feature_libs=
 nxt_feature_test="#include <sys/mman.h>
                   #include <fcntl.h>
+                  #include <unistd.h>
                   #include <sys/stat.h>
                   #include <sys/types.h>
 
                   int main() {
+                      int         ret;
                       static char name[] = \"/unit.configure\";
 
                       shm_unlink(name);
@@ -25,8 +29,10 @@ nxt_feature_test="#include <sys/mman.h>
                       if (fd == -1)
                           return 1;
 
+                      ret = (access(name, F_OK) == 0);
                       shm_unlink(name);
-                      return 0;
+
+                      return ret;
                   }"
 . auto/feature
 
@@ -45,6 +51,40 @@ if [ $nxt_found = no ]; then
 fi
 
 
+if [ $nxt_found = no ]; then
+
+    # DragonFly has no separate namespace for shm_open().
+
+    nxt_feature="shm_open() in /tmp directory"
+    nxt_feature_libs=
+    nxt_feature_test="#include <sys/mman.h>
+                      #include <fcntl.h>
+                      #include <sys/stat.h>
+                      #include <sys/types.h>
+
+                      int main() {
+                          static char name[] = \"/tmp/unit.configure\";
+
+                          shm_unlink(name);
+
+                          int fd = shm_open(name, O_CREAT | O_EXCL | O_RDWR,
+                              S_IRUSR | S_IWUSR);
+                          if (fd == -1)
+                              return 1;
+
+                          shm_unlink(name);
+                          return 0;
+                      }"
+    . auto/feature
+
+    if [ $nxt_found = yes ]; then
+        NXT_SHM_PREFIX="/tmp/"
+    fi
+fi
+
+nxt_shm_open_found=$nxt_found
+
+
 # Linux
 
 nxt_feature="memfd_create()"
@@ -67,3 +107,10 @@ nxt_feature_test="#include <linux/memfd.h>
                   }"
 . auto/feature
 
+
+if [ "$nxt_shm_open_found$nxt_found" = nono ]; then
+    $echo
+    $echo $0: error: no shared memory implementation found.
+    $echo
+    exit 1;
+fi

configure

@@ -145,6 +145,8 @@ cat << END >> $NXT_AUTO_CONFIG_H
 #define NXT_DEBUG  $nxt_debug
 #endif
 
+#define NXT_SHM_PREFIX  "$NXT_SHM_PREFIX"
+
 END
 
 . auto/test_build

src/go/unit/nxt_go_port_memory.c

@@ -49,7 +49,8 @@ nxt_go_new_port_mmap(nxt_go_process_t *process, nxt_port_id_t id,
         return NULL;
     }
 
-    name_len = snprintf(name, sizeof(name) - 1, "/unit.go.%p", name);
+    name_len = snprintf(name, sizeof(name) - 1,
+                        NXT_SHM_PREFIX "unit.go.%p", name);
 
 #if (NXT_HAVE_MEMFD_CREATE)
 

src/nxt_port_memory.c

@@ -280,7 +280,7 @@ nxt_port_new_port_mmap(nxt_task_t *task, nxt_process_t *process,
         return NULL;
     }
 
-    p = nxt_sprintf(name, name + sizeof(name), "/unit.%PI.%uxD",
+    p = nxt_sprintf(name, name + sizeof(name), NXT_SHM_PREFIX "unit.%PI.%uxD",
                     nxt_pid, nxt_random(&task->thread->random));
     *p = '\0';