int
main(int argc, char *argv[]) {
pid_t childPid;
int i, j, dummy;
struct tms tms;
setbuf(stdout, NULL);
switch (childPid = fork()) {
case -1:
errExit("fork");
break;
case 0: /* child */
for (i = 0; i < LOOP; i++) {
/* consume some system CPU time */
times(&tms);
/* consume some user CPU time */
for (j = 0; j < LOOP*100; j++)
dummy = dummy * j + i;
}
_exit(EXIT_SUCCESS);
default: /* parent */
sleep(2);
printf("before wait\n");
printRusage(RUSAGE_CHILDREN);
wait(NULL);
printf("after wait\n");
printRusage(RUSAGE_CHILDREN);
}
exit(EXIT_SUCCESS);
}
int
main(int argc, char *argv[])
{
pid_t childPid;
struct rusage ru;
if (argc < 2 || strcmp(argv[1], "--help") == 0)
usageErr("%s command arg...\n", argv[0]);
switch (childPid = fork()) {
case -1:
errExit("fork");
case 0:
execvp(argv[1], &argv[1]);
errExit("execvp");
default:
printf("Command PID: %ld\n", (long) childPid);
if (wait(NULL) == -1)
errExit("wait");
if (getrusage(RUSAGE_CHILDREN, &ru) == -1)
errExit("getrusage");
printf("\n");
printRusage("\t", &ru);
exit(EXIT_SUCCESS);
}
}
int
main(int argc, char *argv[]) {
pid_t childPid;
switch (childPid = fork()) {
case -1:
errExit("fork");
break;
case 0: /* child */
execvp(argv[1], &argv[1]);
errExit("execvp");
default: /* parent */
wait(NULL);
printRusage(argv[1]);
}
exit(EXIT_SUCCESS);
}
