int main(void)
{
int n;
int fd[2];
pid_t pid;
char line[MAXLINE];
if (pipe(fd) < 0)
err_sys("pipe error");
pid = fork();
switch (pid) {
case -1: err_sys("fork error");
case 0: write(STDOUT_FILENO, "child:", 7);
close(fd[1]);
n = read(fd[0], line, MAXLINE);
write(STDOUT_FILENO, line, n);
default: write(STDOUT_FILENO, "parent:", 8);
close(fd[0]);
write(fd[1], "hello world\n", 12);
break;
}
if (pid > 0) {
pid_t child;
int status;
child = wait(&status);
pr_wait(status);
}
exit(0);
}
/*exec commod and printf exec times*/
static void do_cmd(char *cmd)
{
struct tms tmsstart, tmsend;
clock_t start, end;
int status;
printf("\ncommond: %s\n", cmd);
if ((start = times(&tmsstart)) == -1)
err_sys("times error");
if ((status = system(cmd)) < 0)
err_sys("syster() error");
if ((end = times(&tmsend)) == -1)
err_sys("times error");
pr_times(end - start, &tmsstart, &tmsend);
pr_wait(status);
}
static void print_lkb(char *line, struct rinfo *ri)
{
struct lkb lkb;
char type[4];
int rv;
rv = sscanf(line, "%s %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu",
type,
&lkb.id,
&lkb.nodeid,
&lkb.remid,
&lkb.ownpid,
(unsigned long long *)&lkb.xid,
&lkb.exflags,
&lkb.flags,
&lkb.status,
&lkb.grmode,
&lkb.rqmode,
&lkb.highbast,
&lkb.rsb_lookup,
&lkb.wait_type,
&lkb.lvbseq,
(unsigned long long *)&lkb.timestamp,
(unsigned long long *)&lkb.time_bast);
ri->lkb_count++;
if (lkb.status == DLM_LKSTS_GRANTED) {
if (!ri->print_granted++)
printf("Granted\n");
ri->lkb_granted++;
}
if (lkb.status == DLM_LKSTS_CONVERT) {
if (!ri->print_convert++)
printf("Convert\n");
ri->lkb_convert++;
}
if (lkb.status == DLM_LKSTS_WAITING) {
if (!ri->print_waiting++)
printf("Waiting\n");
ri->lkb_waiting++;
}
if (lkb.rsb_lookup) {
if (!ri->print_lookup++)
printf("Lookup\n");
ri->lkb_lookup++;
}
if (lkb.wait_type)
ri->lkb_wait_msg++;
if (!ri->nodeid) {
if (lkb.nodeid)
ri->lkb_master_copy++;
else
ri->lkb_local_copy++;
} else {
ri->lkb_process_copy++;
}
printf("%08x %s %s %s %s %s\n",
lkb.id, pr_grmode(&lkb), pr_rqmode(&lkb),
pr_remote(&lkb, ri), pr_wait(&lkb),
(verbose && wide) ? pr_verbose(&lkb) : "");
if (verbose && !wide)
printf("%s\n", pr_verbose(&lkb));
}
