minix3/tests/test41.c

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2020-02-21 00:59:27 +05:30
/* Tests for getitimer(2)/setitimer(2) - by D.C. van Moolenbroek */
/* Warning: this test deals with (real and virtual) time, and, lacking a proper
* point of reference, its correctness depends on circumstances like CPU speed
* and system load. A succeeding test run says a lot - failure not so much. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <minix/config.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/syslimits.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#define ITERATIONS 3
int max_error = 4;
#include "common.h"
/* we have to keep in mind the millisecond values are rounded up */
#define UPPERUSEC(us) ((us)+(1000000/system_hz))
#define EQUSEC(l,r) \
((l) <= ((r) + (1000000/system_hz)) && (l) >= ((r) - (1000000/system_hz)))
#define FILLITIMER(it, vs, vu, is, iu) \
(it).it_value.tv_sec = (vs); \
(it).it_value.tv_usec = (vu); \
(it).it_interval.tv_sec = (is); \
(it).it_interval.tv_usec = (iu);
/* these two macros are not fully working for all possible values;
* the tests only use values that the macros can deal with, though. */
#define EQITIMER(it, vs, vu, is, iu) \
((it).it_value.tv_sec == (vs) && EQUSEC((it).it_value.tv_usec,vu) && \
(it).it_interval.tv_sec == (is) && (it).it_interval.tv_usec == (iu))
#define LEITIMER(it, vs, vu, is, iu) \
((it).it_value.tv_sec > 0 && ((it).it_value.tv_sec < (vs) || \
((it).it_value.tv_sec == (vs) && (it).it_value.tv_usec <= \
UPPERUSEC(vu))) && \
(it).it_interval.tv_sec == (is) && EQUSEC((it).it_interval.tv_usec,iu))
int main(int argc, char **argv);
void test(int m, int t);
void test_which(void);
void test_getset(void);
void test_neglarge(void);
void test_zero(void);
void test_timer(void);
void test_alarm(void);
void test_fork(void);
void test_exec(void);
int do_check(void);
void got_alarm(int sig);
void busy_wait(int secs);
#define my_e(n) do { printf("Timer %s, ", names[timer]); e(n); } while(0)
static char *executable;
static int signals;
static int timer;
static long system_hz;
static int sigs[] = { SIGALRM, SIGVTALRM, SIGPROF };
static const char *names[] = { "REAL", "VIRTUAL", "PROF" };
int main(argc, argv)
int argc;
char **argv;
{
int i, m = 0xFFFF, n = 0xF;
char cp_cmd[NAME_MAX+10];
system_hz = sysconf(_SC_CLK_TCK);
if (strcmp(argv[0], "DO CHECK") == 0) {
timer = atoi(argv[1]);
exit(do_check());
}
executable = argv[0];
start(41);
snprintf(cp_cmd, sizeof(cp_cmd), "cp ../%s .", executable);
system(cp_cmd);
if (argc >= 2) m = atoi(argv[1]);
if (argc >= 3) n = atoi(argv[2]);
for (i = 0; i < ITERATIONS; i++) {
if (n & 1) test(m, ITIMER_REAL);
if (n & 2) test(m, ITIMER_VIRTUAL);
if (n & 4) test(m, ITIMER_PROF);
}
quit();
return(-1); /* impossible */
}
void test(m, t)
int m;
int t;
{
timer = t;
if (m & 0001) test_which();
if (m & 0002) test_getset();
if (m & 0004) test_neglarge();
if (m & 0010) test_zero();
if (m & 0020) test_timer();
if (m & 0040) test_alarm();
if (m & 0100) test_fork();
if (m & 0200) test_exec();
}
/* test invalid and unsupported 'which' values */
void test_which()
{
struct itimerval it;
subtest = 0;
errno = 0; if (!getitimer(-1, &it) || errno != EINVAL) my_e(1);
errno = 0; if ( getitimer(timer, &it) ) my_e(2);
errno = 0; if (!getitimer( 3, &it) || errno != EINVAL) my_e(3);
}
/* test if we get back what we set */
void test_getset()
{
struct itimerval it, oit;
subtest = 1;
/* no alarm should be set initially */
if (getitimer(timer, &it)) my_e(1);
if (!EQITIMER(it, 0, 0, 0, 0)) my_e(2);
if (setitimer(timer, &it, &oit)) my_e(3);
if (setitimer(timer, &oit, NULL)) my_e(4);
if (!EQITIMER(oit, 0, 0, 0, 0)) my_e(5);
FILLITIMER(it, 123, 0, 456, 0);
if (setitimer(timer, &it, NULL)) my_e(6);
FILLITIMER(it, 987, 0, 654, 0);
if (setitimer(timer, &it, &oit)) my_e(7);
if (!LEITIMER(oit, 123, 0, 456, 0)) my_e(8);
if (getitimer(timer, &oit)) my_e(9);
if (!LEITIMER(oit, 987, 0, 654, 0)) my_e(10);
FILLITIMER(it, 0, 0, 0, 0);
if (setitimer(timer, &it, &oit)) my_e(11);
if (!LEITIMER(oit, 987, 0, 654, 0)) my_e(12);
if (getitimer(timer, &oit)) my_e(13);
if (!EQITIMER(oit, 0, 0, 0, 0)) my_e(14);
}
/* test negative/large values */
void test_neglarge()
{
struct itimerval it;
subtest = 2;
FILLITIMER(it, 4, 0, 5, 0);
if (setitimer(timer, &it, NULL)) my_e(1);
FILLITIMER(it, 1000000000, 0, 0, 0);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(2);
FILLITIMER(it, 0, 1000000, 0, 0);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(3);
FILLITIMER(it, 0, 0, 0, 1000000);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(4);
FILLITIMER(it, -1, 0, 0, 0);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(5);
FILLITIMER(it, 0, -1, 0, 0);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(6);
FILLITIMER(it, 0, 0, -1, 0);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(7);
FILLITIMER(it, 0, 0, 0, -1);
if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(8);
if (getitimer(timer, &it)) my_e(9);
if (!LEITIMER(it, 4, 0, 5, 0)) my_e(10);
}
/* setitimer with a zero timer has to set the interval to zero as well */
void test_zero()
{
struct itimerval it;
subtest = 3;
it.it_value.tv_sec = 0;
it.it_value.tv_usec = 0;
it.it_interval.tv_sec = 1;
it.it_interval.tv_usec = 1;
if (setitimer(timer, &it, NULL)) my_e(1);
if (getitimer(timer, &it)) my_e(2);
if (!EQITIMER(it, 0, 0, 0, 0)) my_e(3);
}
/* test actual timer functioning */
void test_timer()
{
struct itimerval it;
subtest = 4;
if (signal(sigs[timer], got_alarm) == SIG_ERR) my_e(1);
FILLITIMER(it, 0, 100000, 0, 100000);
if (setitimer(timer, &it, NULL)) my_e(2);
signals = 0;
busy_wait(1);
FILLITIMER(it, 0, 0, 0, 0);
if (setitimer(timer, &it, NULL)) my_e(3);
/* we don't know how many signals we'll actually get in practice,
* so these checks more or less cover the extremes of the acceptable */
if (signals < 2) my_e(4);
if (signals > system_hz * 2) my_e(5);
/* only for REAL timer can we check against the clock */
if (timer == ITIMER_REAL) {
FILLITIMER(it, 1, 0, 0, 0);
if (setitimer(timer, &it, NULL)) my_e(6);
signals = 0;
busy_wait(1);
FILLITIMER(it, 0, 0, 0, 0);
if (setitimer(timer, &it, NULL)) my_e(7);
if (signals != 1) my_e(8);
}
signals = 0;
busy_wait(1);
if (signals != 0) my_e(9);
}
/* test itimer/alarm interaction */
void test_alarm(void) {
struct itimerval it;
/* only applicable for ITIMER_REAL */
if (timer != ITIMER_REAL) return;
subtest = 5;
if (signal(SIGALRM, got_alarm) == SIG_ERR) my_e(1);
FILLITIMER(it, 3, 0, 1, 0);
if (setitimer(timer, &it, NULL)) my_e(2);
if (alarm(2) != 3) my_e(3);
if (getitimer(timer, &it)) my_e(4);
if (!LEITIMER(it, 2, 0, 0, 0)) my_e(5);
signals = 0;
busy_wait(5);
if (signals != 1) my_e(6);
if (getitimer(timer, &it)) my_e(7);
if (!EQITIMER(it, 0, 0, 0, 0)) my_e(8);
}
/* test that the timer is reset on forking */
void test_fork(void) {
struct itimerval it, oit;
pid_t pid;
int status;
subtest = 6;
FILLITIMER(it, 12, 34, 56, 78);
if (setitimer(timer, &it, NULL)) my_e(1);
pid = fork();
if (pid < 0) my_e(2);
if (pid == 0) {
if (getitimer(timer, &it)) exit(5);
if (!EQITIMER(it, 0, 0, 0, 0)) exit(6);
exit(0);
}
if (wait(&status) != pid) my_e(3);
if (!WIFEXITED(status)) my_e(4);
if (WEXITSTATUS(status) != 0) my_e(WEXITSTATUS(status));
FILLITIMER(it, 0, 0, 0, 0);
if (setitimer(timer, &it, &oit)) my_e(7);
if (!LEITIMER(oit, 12, 34, 56, 78)) my_e(8);
}
/* test if timer is carried over to exec()'ed process */
void test_exec(void) {
struct itimerval it;
pid_t pid;
int status;
char buf[2];
subtest = 7;
pid = fork();
if (pid < 0) my_e(1);
if (pid == 0) {
FILLITIMER(it, 3, 0, 1, 0);
if (setitimer(timer, &it, NULL)) exit(2);
sprintf(buf, "%d", timer);
execl(executable, "DO CHECK", buf, NULL);
exit(3);
}
if (wait(&status) != pid) my_e(4);
if (WIFSIGNALED(status)) {
/* process should have died from corresponding signal */
if (WTERMSIG(status) != sigs[timer]) my_e(5);
}
else {
if (WIFEXITED(status)) my_e(WEXITSTATUS(status));
else my_e(6);
}
}
/* procedure of the exec()'ed process */
int do_check()
{
struct itimerval it;
if (getitimer(timer, &it)) return(81);
if (!LEITIMER(it, 3, 0, 1, 0)) return(82);
busy_wait(60);
return(83);
}
void busy_wait(secs)
int secs;
{
time_t now, exp;
int i;
exp = time(&now) + secs + 1;
while (now < exp) {
for (i = 0; i < 100000; i++);
time(&now);
}
}
void got_alarm(sig)
int sig;
{
if (sig != sigs[timer]) my_e(1001);
signals++;
}