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Annotation of coherent/d/lib/libc/gen/ttyname.c, revision 1.1

1.1     ! root        1: #define        NEWTTYS 1
        !             2: /*
        !             3:  * Coherent I/O Library
        !             4:  * Return the name of the terminal device
        !             5:  * associated with the given file descriptor.
        !             6:  * The names in /etc/ttys define the domain.
        !             7:  */
        !             8: #include <stdio.h>
        !             9: #include <sys/stat.h>
        !            10: #include <sys/dir.h>
        !            11: 
        !            12: static char dev_buff[DIRSIZ+8] = "/dev/console";
        !            13: 
        !            14: char *
        !            15: ttyname(fd)
        !            16: int fd;
        !            17: {
        !            18:        if (fttyslot(fd) >= 0)
        !            19:                return (dev_buff);
        !            20:        return (NULL);
        !            21: }
        !            22: 
        !            23: /*
        !            24:  * Return the /etc/ttys slot for fd, -1 on error.
        !            25:  * The /dev/... name is left in dev_buff.
        !            26:  * Used by ttyname and ttyslot.
        !            27:  */
        !            28: fttyslot(fd)
        !            29: {
        !            30:        register FILE *fp;
        !            31:        register short fd_mode;
        !            32:        register dev_t fd_rdev;
        !            33:        register int slot;
        !            34:        struct stat sb;
        !            35:        extern char *index();
        !            36: 
        !            37:        if (fstat(fd, &sb) < 0
        !            38:         || (fp = fopen("/etc/ttys", "r")) == NULL)
        !            39:                return (-1);
        !            40:        fd_mode = sb.st_mode;
        !            41:        fd_rdev = sb.st_rdev;
        !            42:        for (slot = 0; ; slot += 1) {
        !            43:                if (getc(fp) == '\n'    /* Missing status */
        !            44: #if NEWTTYS
        !            45:                 || getc(fp) == '\n'    /* Missing line type, ie loc or rem */
        !            46: #endif
        !            47:                 || getc(fp) == '\n'    /* Missing getty arg */
        !            48:                 || fgets(dev_buff+5, DIRSIZ, fp) == NULL
        !            49:                 || index(dev_buff, '\n') == NULL) {
        !            50:                        slot = -1;
        !            51:                        break;
        !            52:                }
        !            53:                *index(dev_buff, '\n') = 0;
        !            54:                if (stat(dev_buff, &sb) >= 0
        !            55:                 && sb.st_mode == fd_mode
        !            56:                 && sb.st_rdev == fd_rdev)
        !            57:                        break;
        !            58:        }
        !            59:        fclose(fp);
        !            60:        return (slot);
        !            61: }

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