Libc-498.tar.gz

[apple/libc.git] / stdlib / grantpt.c

diff --git a/stdlib/grantpt.c b/stdlib/grantpt.c
new file mode 100644 (file)
index 0000000..d0411ba
--- /dev/null
+++ b/stdlib/grantpt.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/*
+ * posix_openpt call for cloning pty implementation.
+ *
+ * Just open /dev/ptmx
+ */
+int
+posix_openpt(int flags)
+{
+       int fd = open("/dev/ptmx", flags);
+       if (fd >= 0)
+               return fd;
+       return -1;
+}
+
+/*
+ * grantpt call for cloning pty implementation.
+ *
+ * Change UID and GID of slave pty associated with master pty whose
+ * fd is provided, to the real UID and real GID of the calling thread.
+ */
+int
+grantpt(int fd)
+{
+       return ioctl(fd, TIOCPTYGRANT);
+}
+
+/*
+ * ptsname call for cloning pty implementation.
+ *
+ * NOTE: Returns a pointer to a static buffer, which will be overwritten on
+ * subsequent calls.
+ */
+char *
+ptsname(int fd)
+{
+       static char ptsnamebuf[ 128];   /* ioctl knows length */
+       int error;
+       char *retval = NULL;
+       struct stat sbuf;
+
+       error = ioctl(fd, TIOCPTYGNAME, ptsnamebuf);
+       if (!error) {
+               /*
+                * XXX TSD
+                *
+                * POSIX: Handle device rename test case, which is expected
+                * to fail if the pty has been renamed.
+                */
+               if (stat(ptsnamebuf, &sbuf) == 0)
+                       retval = ptsnamebuf;
+       }
+
+       return (retval);
+}
+
+/*
+ * unlockpt call for cloning pty implementation.
+ *
+ * Unlock the slave pty associated with the master to which fd refers.
+ */
+int
+unlockpt(int fd)
+{
+       return ioctl(fd, TIOCPTYUNLK);
+}