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Annotation of researchv10no/cmd/asd++/locksubs.c, revision 1.1

1.1     ! root        1: #include "decl.h"
        !             2: #include <signal.h>
        !             3: 
        !             4: static lockcount = 0;
        !             5: static SIG_TYP intsav, quitsav, hupsav, pipesave, termsav;
        !             6: 
        !             7: void
        !             8: lock (Path& dir)
        !             9: {
        !            10:        Path com = dir & "L." + String(dec(getpid()));
        !            11:        int snooze = 0;
        !            12: 
        !            13:        if (lockcount++ == 0) {
        !            14:                intsav = signal (SIGINT, SIG_IGN);
        !            15:                quitsav = signal (SIGQUIT, SIG_IGN);
        !            16:                hupsav = signal (SIGHUP, SIG_IGN);
        !            17:                pipesave = signal (SIGPIPE, SIG_IGN);
        !            18:                termsav = signal (SIGTERM, SIG_IGN);
        !            19:        }
        !            20: 
        !            21:        int fd;
        !            22:        if ((fd = creat (com, 0)) < 0) {
        !            23:                cout << "cannot create lock file " << com << "\n";
        !            24:                exit (1);
        !            25:        }
        !            26:        close (fd);
        !            27: 
        !            28:        while (link (com, dir & "lock") < 0)
        !            29:                sleep (snooze++);
        !            30: }
        !            31: 
        !            32: void
        !            33: unlock (Path& dir)
        !            34: {
        !            35:        unlink (dir & "L." + String(dec(getpid())));
        !            36:        unlink (dir & "lock");
        !            37: 
        !            38:        if (--lockcount == 0) {
        !            39:                signal (SIGINT, intsav);
        !            40:                signal (SIGQUIT, quitsav);
        !            41:                signal (SIGHUP, hupsav);
        !            42:                signal (SIGPIPE, pipesave);
        !            43:                signal (SIGTERM, termsav);
        !            44:        }
        !            45: }

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