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