-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)ttyname.c 5.2 (Berkeley) 3/9/86";
-#endif LIBC_SCCS and not lint
-
/*
- * ttyname(f): return "/dev/ttyXX" which the the name of the
- * tty belonging to file f.
- * NULL if it is not a tty
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that: (1) source distributions retain this entire copyright
+ * notice and comment, and (2) distributions including binaries display
+ * the following acknowledgement: ``This product includes software
+ * developed by the University of California, Berkeley and its contributors''
+ * in the documentation or other materials provided with the distribution
+ * and in all advertising materials mentioning features or use of this
+ * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#define NULL 0
-#include <sys/param.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ttyname.c 5.6 (Berkeley) 6/1/90";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
-
-static char dev[] = "/dev/";
-char *strcpy();
-char *strcat();
+#include <sgtty.h>
+#include <paths.h>
char *
-ttyname(f)
+ttyname(fd)
+ int fd;
{
- struct stat fsb;
- struct stat tsb;
- register struct direct *db;
- register DIR *df;
- static char rbuf[32];
+ register struct direct *dirp;
+ register DIR *dp;
+ struct stat sb1, sb2;
+ struct sgttyb ttyb;
+ static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
+ char *rval, *strcpy();
- if (isatty(f)==0)
- return(NULL);
- if (fstat(f, &fsb) < 0)
+ if (ioctl(fd, TIOCGETP, &ttyb) < 0)
return(NULL);
- if ((fsb.st_mode&S_IFMT) != S_IFCHR)
+ if (fstat(fd, &sb1) < 0 || (sb1.st_mode&S_IFMT) != S_IFCHR)
return(NULL);
- if ((df = opendir(dev)) == NULL)
+ if ((dp = opendir(_PATH_DEV)) == NULL)
return(NULL);
- while ((db = readdir(df)) != NULL) {
- if (db->d_ino != fsb.st_ino)
+ for (rval = NULL; dirp = readdir(dp);) {
+ if (dirp->d_ino != sb1.st_ino)
continue;
- strcpy(rbuf, dev);
- strcat(rbuf, db->d_name);
- if (stat(rbuf, &tsb) < 0)
+ (void)strcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name);
+ if (stat(buf, &sb2) < 0 || sb1.st_dev != sb2.st_dev ||
+ sb1.st_ino != sb2.st_ino)
continue;
- if (tsb.st_dev == fsb.st_dev && tsb.st_ino == fsb.st_ino) {
- closedir(df);
- return(rbuf);
- }
+ closedir(dp);
+ rval = buf;
+ break;
}
- closedir(df);
- return(NULL);
+ closedir(dp);
+ return(rval);
}