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Annotation of coherent/d/bin/lpr/lpskip.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Cause the line printer daemon to
        !             3:  * skip the current listing.
        !             4:  * With `-r' option, make it restart the
        !             5:  * current listing.
        !             6:  * SIGTRAP is used for skipping; SIGREST for restarting.
        !             7:  * (NOTE: this should be setuid to daemon).
        !             8:  */
        !             9: 
        !            10: #include <stdio.h>
        !            11: #include <signal.h>
        !            12: 
        !            13: #ifdef LASER
        !            14: char   lockfile[] = "/usr/spool/hpd/dpid";
        !            15: #else
        !            16: char   lockfile[] = "/usr/spool/lpd/dpid";
        !            17: #endif
        !            18: char *argv0;
        !            19: 
        !            20: main(argc, argv)
        !            21: char *argv[];
        !            22: {
        !            23:        int pid;
        !            24:        register int fd;
        !            25:        register int sig = SIGTRAP;
        !            26: 
        !            27:        argv0 = argv[0];
        !            28:        if (argc>1 && *argv[1]=='-') {
        !            29:                if (argv[1][1]=='r' && argv[1][2]=='\0')
        !            30:                        sig = SIGREST;
        !            31:                else
        !            32:                        usage();
        !            33:        }
        !            34:        if ((fd = open(lockfile, 0)) < 0
        !            35:         || read(fd, &pid, sizeof pid) != sizeof (pid)
        !            36:         || kill(pid, sig) < 0) {
        !            37:                fprintf(stderr, "Line printer daemon not active\n");
        !            38:                exit(1);
        !            39:        }
        !            40: }
        !            41: 
        !            42: usage()
        !            43: {
        !            44:        fprintf(stderr, "Usage: %s [-r]\n", argv0);
        !            45:        exit(1);
        !            46: }

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