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Annotation of 43BSD/usr.bin/tip/hunt.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)hunt.c     5.1 (Berkeley) 4/30/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "tip.h"
        !            12: 
        !            13: extern char *getremote();
        !            14: extern char *rindex();
        !            15: 
        !            16: static jmp_buf deadline;
        !            17: static int deadfl;
        !            18: 
        !            19: dead()
        !            20: {
        !            21: 
        !            22:        deadfl = 1;
        !            23:        longjmp(deadline, 1);
        !            24: }
        !            25: 
        !            26: hunt(name)
        !            27:        char *name;
        !            28: {
        !            29:        register char *cp;
        !            30:        int (*f)();
        !            31: 
        !            32:        f = signal(SIGALRM, dead);
        !            33:        deadfl = 0;
        !            34:        while (cp = getremote(name)) {
        !            35:                uucplock = rindex(cp, '/')+1;
        !            36:                if (mlock(uucplock) < 0) {
        !            37:                        delock(uucplock);
        !            38:                        continue;
        !            39:                }
        !            40:                /*
        !            41:                 * Straight through call units, such as the BIZCOMP,
        !            42:                 * VADIC and the DF, must indicate they're hardwired in
        !            43:                 *  order to get an open file descriptor placed in FD.
        !            44:                 * Otherwise, as for a DN-11, the open will have to
        !            45:                 *  be done in the "open" routine.
        !            46:                 */
        !            47:                if (!HW)
        !            48:                        break;
        !            49:                if (setjmp(deadline) == 0) {
        !            50:                        alarm(10);
        !            51:                        FD = open(cp, O_RDWR);
        !            52:                }
        !            53:                alarm(0);
        !            54:                if (FD < 0) {
        !            55:                        perror(cp);
        !            56:                        deadfl = 1;
        !            57:                }
        !            58:                if (!deadfl) {
        !            59:                        ioctl(FD, TIOCEXCL, 0);
        !            60:                        ioctl(FD, TIOCHPCL, 0);
        !            61:                        signal(SIGALRM, SIG_DFL);
        !            62:                        return ((int)cp);
        !            63:                }
        !            64:                delock(uucplock);
        !            65:        }
        !            66:        signal(SIGALRM, f);
        !            67:        return (deadfl ? -1 : (int)cp);
        !            68: }

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