1 files changed, 188 insertions, 0 deletions
diff --git a/src/server/server_create_socket.c b/src/server/server_create_socket.c
new file mode 100644
index 0000000..77e55b7
--- /dev/null
+++ b/src/server/server_create_socket.c
@@ -0,0 +1,188 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "server.h"
+
+static int create_socket (int result [const restrict static 1])
+{
+   const int old_errno = errno;
+
+   errno = 0;
+   *result = socket(AF_UNIX, SOCK_STREAM, 0);
+
+   if (*result == -1)
+   {
+      fprintf
+      (
+         stderr,
+         "[F] Unable to create server socket: %s.\n",
+         strerror(errno)
+      );
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   errno = old_errno;
+
+   return 0;
+}
+
+static int bind_socket
+(
+   const int socket,
+   const char socket_name [const restrict static 1]
+)
+{
+   struct sockaddr_un addr;
+   const int old_errno = errno;
+
+   errno = 0;
+   memset(&addr, 0, sizeof(struct sockaddr_un));
+
+   addr.sun_family = AF_UNIX;
+
+   /* addr.sun_path == 108. Using 107 ensure null-termination. */
+   strncpy(addr.sun_path, socket_name, 107);
+
+   errno = old_errno;
+
+   if
+   (
+      bind
+      (
+         socket,
+         (const struct sockaddr *) &addr,
+         (socklen_t) sizeof(struct sockaddr_un)
+      ) != 0
+   )
+   {
+      fprintf
+      (
+         stderr,
+         "[F] Unable to bind server socket to %s: %s.\n",
+         socket_name,
+         strerror(errno)
+      );
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   errno = old_errno;
+
+   return 0;
+}
+
+static int set_socket_to_unblocking (const int socket)
+{
+   int current_flags;
+   const int old_errno = errno;
+
+   current_flags = fcntl(socket, F_GETFD);
+
+   if (current_flags == -1)
+   {
+      fprintf
+      (
+         stderr,
+         "[F] Unable to get server socket properties: %s.\n",
+         strerror(errno)
+      );
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   /* current_flags = current_flags & (~O_NONBLOCK); */
+
+   current_flags = fcntl(socket, F_SETFD, (current_flags | O_NONBLOCK));
+
+   if (current_flags == -1)
+   {
+      fprintf
+      (
+         stderr,
+         "[F] Unable to set server socket properties: %s.\n",
+         strerror(errno)
+      );
+
+      errno = old_errno;
+
+      return -2;
+   }
+
+   errno = old_errno;
+
+   return 0;
+}
+
+static int set_socket_as_listener (const int socket)
+{
+   const int old_errno = errno;
+
+   if (listen(socket, ZoO_SERVER_SOCKET_LISTEN_BACKLOG) != 0)
+   {
+      fprintf
+      (
+         stderr,
+         "[F] Unable to set server socket properties: %s.\n",
+         strerror(errno)
+      );
+
+      errno = old_errno;
+
+      return -1;
+   }
+
+   errno = old_errno;
+
+   return 0;
+}
+
+int ZoO_server_socket_open
+(
+   struct ZoO_server_socket server_socket [const restrict static 1],
+   const char socket_name [const restrict static 1]
+)
+{
+   if (create_socket(&(server_socket->file_descriptor)) < 0)
+   {
+      return -1;
+   }
+
+   if (bind_socket(server_socket->file_descriptor, socket_name) < 0)
+   {
+      close(server_socket->file_descriptor);
+
+      return -1;
+   }
+
+   if (set_socket_to_unblocking(server_socket->file_descriptor) < 0)
+   {
+      close(server_socket->file_descriptor);
+
+      return -1;
+   }
+
+   if (set_socket_as_listener(server_socket->file_descriptor) < 0)
+   {
+      close(server_socket->file_descriptor);
+
+      return -1;
+   }
+
+   FD_ZERO(&(server_socket->as_a_set));
+   FD_SET(server_socket->file_descriptor, &(server_socket->as_a_set));
+
+   return 0;
+}