386BSD 0.0 development

Work on file usr/src/lib/libc/gen/ttyname.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.0/src

diff --git a/usr/src/lib/libc/gen/ttyname.c b/usr/src/lib/libc/gen/ttyname.c
new file mode 100644 (file)
index 0000000..3a9f09c
--- /dev/null
+++ b/usr/src/lib/libc/gen/ttyname.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ttyname.c  5.10 (Berkeley) 5/6/91";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <sgtty.h>
+#include <db.h>
+#include <unistd.h>
+#include <paths.h>
+
+static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
+
+char *
+ttyname(fd)
+       int fd;
+{
+       struct stat sb;
+       struct sgttyb ttyb;
+       DB *db;
+       DBT data, key;
+       struct {
+               mode_t type;
+               dev_t dev;
+       } bkey;
+       static char *__oldttyname();
+
+       /* Must be a terminal. */
+       if (ioctl(fd, TIOCGETP, &ttyb) < 0)
+               return(NULL);
+       /* Must be a character device. */
+       if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
+               return(NULL);
+
+       if (db = hash_open(_PATH_DEVDB, O_RDONLY, 0, NULL)) {
+               bkey.type = S_IFCHR;
+               bkey.dev = sb.st_rdev;
+               key.data = &bkey;
+               key.size = sizeof(bkey);
+               if (!(db->get)(db, &key, &data, 0)) {
+                       bcopy(data.data,
+                           buf + sizeof(_PATH_DEV) - 1, data.size);
+                       return(buf);
+               }
+       }
+       return(__oldttyname(fd, &sb));
+}
+
+static char *
+__oldttyname(fd, sb)
+       int fd;
+       struct stat *sb;
+{
+       register struct dirent *dirp;
+       register DIR *dp;
+       struct stat dsb;
+       char *rval, *strcpy();
+
+       if ((dp = opendir(_PATH_DEV)) == NULL)
+               return(NULL);
+
+       for (rval = NULL; dirp = readdir(dp);) {
+               if (dirp->d_fileno != sb->st_ino)
+                       continue;
+               bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1,
+                   dirp->d_namlen + 1);
+               if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev ||
+                   sb->st_ino != dsb.st_ino)
+                       continue;
+               (void)closedir(dp);
+               rval = buf;
+               break;
+       }
+       (void)closedir(dp);
+       return(rval);
+}