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Annotation of 43BSDReno/usr.bin/tip/hunt.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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: #ifndef lint
                     21: static char sccsid[] = "@(#)hunt.c     5.6 (Berkeley) 6/1/90";
                     22: #endif /* not lint */
                     23: 
                     24: #include "tip.h"
                     25: 
                     26: extern char *getremote();
                     27: extern char *rindex();
                     28: 
                     29: static jmp_buf deadline;
                     30: static int deadfl;
                     31: 
                     32: void
                     33: dead()
                     34: {
                     35:        deadfl = 1;
                     36:        longjmp(deadline, 1);
                     37: }
                     38: 
                     39: hunt(name)
                     40:        char *name;
                     41: {
                     42:        register char *cp;
                     43:        sig_t f;
                     44: 
                     45:        f = signal(SIGALRM, dead);
                     46:        while (cp = getremote(name)) {
                     47:                deadfl = 0;
                     48:                uucplock = rindex(cp, '/')+1;
                     49:                if (uu_lock(uucplock) < 0)
                     50:                        continue;
                     51:                /*
                     52:                 * Straight through call units, such as the BIZCOMP,
                     53:                 * VADIC and the DF, must indicate they're hardwired in
                     54:                 *  order to get an open file descriptor placed in FD.
                     55:                 * Otherwise, as for a DN-11, the open will have to
                     56:                 *  be done in the "open" routine.
                     57:                 */
                     58:                if (!HW)
                     59:                        break;
                     60:                if (setjmp(deadline) == 0) {
                     61:                        alarm(10);
                     62:                        FD = open(cp, O_RDWR);
                     63:                }
                     64:                alarm(0);
                     65:                if (FD < 0) {
                     66:                        perror(cp);
                     67:                        deadfl = 1;
                     68:                }
                     69:                if (!deadfl) {
                     70:                        ioctl(FD, TIOCEXCL, 0);
                     71:                        ioctl(FD, TIOCHPCL, 0);
                     72:                        signal(SIGALRM, SIG_DFL);
                     73:                        return ((int)cp);
                     74:                }
                     75:                (void)uu_unlock(uucplock);
                     76:        }
                     77:        signal(SIGALRM, f);
                     78:        return (deadfl ? -1 : (int)cp);
                     79: }

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