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Annotation of Net2/tests/benchmarks/vforks.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Benchmark program to calculate vfork+wait
        !             3:  * overhead (approximately).  Process
        !             4:  * vvforks and exits while parent waits.
        !             5:  * The time to run this program is used
        !             6:  * in calculating exec overhead.
        !             7:  */
        !             8: 
        !             9: main(argc, argv)
        !            10:        char *argv[];
        !            11: {
        !            12:        register int nvforks, i;
        !            13:        char *cp;
        !            14:        int pid, child, status, brksize;
        !            15: 
        !            16:        if (argc < 2) {
        !            17:                printf("usage: %s number-of-vforks sbrk-size\n", argv[0]);
        !            18:                exit(1);
        !            19:        }
        !            20:        nvforks = atoi(argv[1]);
        !            21:        if (nvforks < 0) {
        !            22:                printf("%s: bad number of vforks\n", argv[1]);
        !            23:                exit(2);
        !            24:        }
        !            25:        brksize = atoi(argv[2]);
        !            26:        if (brksize < 0) {
        !            27:                printf("%s: bad size to sbrk\n", argv[2]);
        !            28:                exit(3);
        !            29:        }
        !            30:        cp = (char *)sbrk(brksize);
        !            31:        if ((int)cp == -1) {
        !            32:                perror("sbrk");
        !            33:                exit(4);
        !            34:        }
        !            35:        for (i = 0; i < brksize; i += 1024)
        !            36:                cp[i] = i;
        !            37:        while (nvforks-- > 0) {
        !            38:                child = vfork();
        !            39:                if (child == -1) {
        !            40:                        perror("vfork");
        !            41:                        exit(-1);
        !            42:                }
        !            43:                if (child == 0)
        !            44:                        _exit(-1);
        !            45:                while ((pid = wait(&status)) != -1 && pid != child)
        !            46:                        ;
        !            47:        }
        !            48:        exit(0);
        !            49: }

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