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Annotation of coherent/b/lib/libc/gen/ttyname.c, revision 1.1.1.1

1.1       root        1: #define        NEWTTYS 1
                      2: /*
                      3:  * libc/gen/ttyname.c
                      4:  * Coherent I/O Library.
                      5:  * Return the name of the terminal device
                      6:  * associated with the given file descriptor.
                      7:  * The names in /etc/ttys define the domain.
                      8:  */
                      9: 
                     10: #include <limits.h>
                     11: #include <stdio.h>
                     12: #include <string.h>
                     13: #include <sys/stat.h>
                     14: 
                     15: static char dev_buff [PATH_MAX + 8] = "/dev/console";
                     16: 
                     17: char *
                     18: ttyname(fd) int fd;
                     19: {
                     20:        if (_ttyslot (fd) >= 0)
                     21:                return dev_buff;
                     22:        return NULL;
                     23: }
                     24: 
                     25: /*
                     26:  * Return the /etc/ttys slot for fd, -1 on error.
                     27:  * The /dev/... name is left in dev_buff.
                     28:  * Used by ttyname() and ttyslot().
                     29:  */
                     30: int
                     31: _ttyslot(fd) int fd;
                     32: {
                     33:        register FILE *fp;
                     34:        register short fd_mode;
                     35:        register dev_t fd_rdev;
                     36:        register int slot;
                     37:        struct stat sb;
                     38: 
                     39:        if (fstat(fd, &sb) < 0 ||
                     40:            (fp = fopen("/etc/ttys", "r")) == NULL)
                     41:                return -1;
                     42:        fd_mode = sb.st_mode;
                     43:        fd_rdev = sb.st_rdev;
                     44:        for (slot = 0; ; slot += 1) {
                     45:                if (getc (fp) == '\n' || /* Missing status */
                     46: #if NEWTTYS
                     47:                    getc (fp) == '\n' || /* Missing line type, ie loc or rem */
                     48: #endif
                     49:                    getc (fp) == '\n' ||        /* Missing getty arg */
                     50:                    fgets (dev_buff + 5, NAME_MAX, fp) == NULL ||
                     51:                    strchr (dev_buff, '\n') == NULL) {
                     52:                        slot = -1;
                     53:                        break;
                     54:                }
                     55:                * strchr (dev_buff, '\n') = 0;
                     56:                if (stat (dev_buff, & sb) >= 0 && sb.st_mode == fd_mode &&
                     57:                    sb.st_rdev == fd_rdev)
                     58:                        break;
                     59:        }
                     60:        fclose (fp);
                     61:        return slot;
                     62: }
                     63: 
                     64: /* end of libc/gen/ttyname.c */

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