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Annotation of researchv9/cmd/hang.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: #include <signal.h>
        !             3: #include <sys/pioctl.h>
        !             4: 
        !             5: main(argc,argv)
        !             6: int argc; char **argv;
        !             7: {
        !             8:        int pfd;
        !             9:        char procnam[16];
        !            10:        long mask = (1<<(SIGSTOP-1));
        !            11:        FILE *ttyerr;
        !            12: 
        !            13:        ttyerr = fopen("/dev/tty", "w");
        !            14:        if (argc <= 1) {
        !            15:                if( ttyerr )
        !            16:                        fprintf(ttyerr,"Usage: %s cmd [args...]\n",*argv);
        !            17:                exit(1);
        !            18:        }
        !            19:        sprintf(procnam,"/proc/%05d",getpid());
        !            20:        if ((pfd=open(procnam,0)) < 0) {
        !            21:                if( ttyerr )
        !            22:                        fprintf(ttyerr,"cannot open %s\n",procnam);
        !            23:                exit(1);
        !            24:        }
        !            25:        ioctl(pfd,PIOCSMASK,&mask);
        !            26:        ioctl(pfd,PIOCSEXEC,0);
        !            27:        close(pfd);
        !            28:        if( ttyerr ){
        !            29:                fprintf(ttyerr,"%s\n",procnam);
        !            30:                fclose(ttyerr);
        !            31:        }
        !            32:        execvp(argv[1], argv+1);
        !            33:        perror(argv[1]);
        !            34:        exit(1);
        !            35: }

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