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Annotation of 43BSDReno/lib/libc/gen/ttyname.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)ttyname.c  5.6 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/dir.h>
                     26: #include <sys/stat.h>
                     27: #include <sgtty.h>
                     28: #include <paths.h>
                     29: 
                     30: char *
                     31: ttyname(fd)
                     32:        int fd;
                     33: {
                     34:        register struct direct *dirp;
                     35:        register DIR *dp;
                     36:        struct stat sb1, sb2;
                     37:        struct sgttyb ttyb;
                     38:        static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
                     39:        char *rval, *strcpy();
                     40: 
                     41:        if (ioctl(fd, TIOCGETP, &ttyb) < 0)
                     42:                return(NULL);
                     43:        if (fstat(fd, &sb1) < 0 || (sb1.st_mode&S_IFMT) != S_IFCHR)
                     44:                return(NULL);
                     45:        if ((dp = opendir(_PATH_DEV)) == NULL)
                     46:                return(NULL);
                     47:        for (rval = NULL; dirp = readdir(dp);) {
                     48:                if (dirp->d_ino != sb1.st_ino)
                     49:                        continue;
                     50:                (void)strcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name);
                     51:                if (stat(buf, &sb2) < 0 || sb1.st_dev != sb2.st_dev ||
                     52:                    sb1.st_ino != sb2.st_ino)
                     53:                        continue;
                     54:                closedir(dp);
                     55:                rval = buf;
                     56:                break;
                     57:        }
                     58:        closedir(dp);
                     59:        return(rval);
                     60: }

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