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Annotation of coherent/b/lib/libc/XSTDIO/other/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 <stdio.h>
                     11: #include <sys/stat.h>
                     12: #include <sys/dir.h>
                     13: 
                     14: extern char *index();
                     15: 
                     16: static char dev_buff[DIRSIZ+8] = "/dev/console";
                     17: 
                     18: char *
                     19: ttyname(fd) int fd;
                     20: {
                     21:        if (_ttyslot(fd) >= 0)
                     22:                return dev_buff;
                     23:        return NULL;
                     24: }
                     25: 
                     26: /*
                     27:  * Return the /etc/ttys slot for fd, -1 on error.
                     28:  * The /dev/... name is left in dev_buff.
                     29:  * Used by ttyname() and ttyslot().
                     30:  */
                     31: int
                     32: _ttyslot(fd) int fd;
                     33: {
                     34:        register FILE *fp;
                     35:        register short fd_mode;
                     36:        register dev_t fd_rdev;
                     37:        register int slot;
                     38:        struct stat sb;
                     39: 
                     40:        if (fstat(fd, &sb) < 0
                     41:         || (fp = fopen("/etc/ttys", "r")) == NULL)
                     42:                return -1;
                     43:        fd_mode = sb.st_mode;
                     44:        fd_rdev = sb.st_rdev;
                     45:        for (slot = 0; ; slot += 1) {
                     46:                if (getc(fp) == '\n'    /* Missing status */
                     47: #if NEWTTYS
                     48:                 || getc(fp) == '\n'    /* Missing line type, ie loc or rem */
                     49: #endif
                     50:                 || getc(fp) == '\n'    /* Missing getty arg */
                     51:                 || fgets(dev_buff+5, DIRSIZ, fp) == NULL
                     52:                 || index(dev_buff, '\n') == NULL) {
                     53:                        slot = -1;
                     54:                        break;
                     55:                }
                     56:                *index(dev_buff, '\n') = 0;
                     57:                if (stat(dev_buff, &sb) >= 0
                     58:                 && sb.st_mode == fd_mode
                     59:                 && sb.st_rdev == fd_rdev)
                     60:                        break;
                     61:        }
                     62:        fclose(fp);
                     63:        return slot;
                     64: }
                     65: 
                     66: /* end of libc/gen/ttyname.c */

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