add the beginning of an api for managing ptys

src/ply-terminal.c

@@ -0,0 +1,174 @@
+/* ply-terminal.c - psuedoterminal abstraction
+ *
+ * Copyright (C) 2006, 2007 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Written by: Kristian Høgsberg <krh@redhat.com>
+ *             Ray Strode <rstrode@redhat.com>
+ */
+#include "config.h"
+#include "ply-terminal.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "ply-utils.h"
+
+struct _ply_terminal
+{
+  char  *name;
+  int fd;
+};
+
+ply_terminal_t *
+ply_terminal_new (void)
+{
+  ply_terminal_t *terminal;
+
+  terminal = calloc (1, sizeof (ply_terminal_t));
+  terminal->fd = -1;
+
+  return terminal;
+}
+
+void
+ply_terminal_free (ply_terminal_t *terminal)
+{
+  assert (terminal != NULL);
+
+  ply_terminal_close (terminal);
+  free (terminal);
+}
+
+bool
+ply_terminal_open (ply_terminal_t *terminal)
+{
+  int saved_errno;
+
+  assert (terminal != NULL);
+  assert (!ply_terminal_is_open (terminal));
+
+  terminal->fd = posix_openpt (O_RDWR | O_NOCTTY);
+
+  if (terminal->fd < 0)
+    return false;
+
+  if (grantpt (terminal->fd) < 0)
+    {
+      saved_errno = errno;
+      ply_terminal_close (terminal);
+      errno = saved_errno;
+      return false;
+    }
+
+  if (unlockpt (terminal->fd) < 0)
+    {
+      saved_errno = errno;
+      ply_terminal_close (terminal);
+      errno = saved_errno;
+      return false;
+    }
+
+  terminal->name = strdup (ptsname (terminal->fd));
+
+  return true;
+}
+
+bool
+ply_terminal_is_open (ply_terminal_t *terminal)
+{
+  assert (terminal != NULL);
+
+  return terminal->fd >= 0;
+}
+
+void
+ply_terminal_close (ply_terminal_t *terminal)
+{
+  assert (terminal != NULL);
+
+  free (terminal->name);
+  terminal->name = NULL;
+
+  close (terminal->fd);
+  terminal->fd = -1;
+}
+
+int 
+ply_terminal_get_fd (ply_terminal_t *terminal)
+{
+  assert (terminal != NULL);
+
+  return terminal->fd;
+}
+
+char *
+ply_terminal_get_name (ply_terminal_t *terminal)
+{
+  assert (terminal != NULL);
+  assert (ply_terminal_is_open (terminal));
+
+  assert (terminal->name != NULL);
+  return strdup (terminal->name);
+}
+
+#ifdef PLY_TERMINAL_ENABLE_TEST
+
+#include <stdio.h>
+
+int
+main (int    argc,
+      char **argv)
+{
+  ply_terminal_t *terminal;
+  char *name;
+  uint8_t byte;
+  int exit_code;
+
+  exit_code = 0;
+
+  terminal = ply_terminal_new ();
+
+  if (!ply_terminal_open (terminal))
+    {
+      exit_code = errno;
+      perror ("could not open new terminal");
+      return exit_code;
+    }
+
+  name = ply_terminal_get_name (terminal);
+  printf ("terminal name is '%s'\n", name);
+
+  while (read (ply_terminal_get_fd (terminal), 
+               &byte, sizeof (byte)) == 1)
+    printf ("%c", byte);
+
+  ply_terminal_free (terminal);
+
+  return exit_code;
+}
+
+#endif /* PLY_TERMINAL_ENABLE_TEST */
+/* vim: set ts=4 sw=4 expandtab autoindent cindent cino={.5s,(0: */

src/ply-terminal.h

@@ -0,0 +1,42 @@
+/* ply-terminal.h - psuedoterminal abstraction
+ *
+ * Copyright (C) 2007 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Written By: Ray Strode <rstrode@redhat.com>
+ */
+#ifndef PLY_TERMINAL_H
+#define PLY_TERMINAL_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <unistd.h>
+
+typedef struct _ply_terminal ply_terminal_t;
+
+#ifndef PLY_HIDE_FUNCTION_DECLARATIONS
+ply_terminal_t *ply_terminal_new ();
+void ply_terminal_free (ply_terminal_t *terminal);
+bool ply_terminal_open (ply_terminal_t *terminal);
+bool ply_terminal_is_open (ply_terminal_t *terminal);
+void ply_terminal_close (ply_terminal_t *terminal);
+int ply_terminal_get_fd (ply_terminal_t *terminal);
+char *ply_terminal_get_name (ply_terminal_t *terminal);
+#endif
+
+#endif /* PLY_TERMINAL_H */
+/* vim: set ts=4 sw=4 expandtab autoindent cindent cino={.5s,(0: */