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