test/test8.c
/* test8: pipe()		Author: Jan-Mark Wams (jms@cs.vu.nl) */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include <time.h>
#include <stdio.h>

#define MAX_ERROR	4
#define ITERATIONS     60

#define Fstat(a,b)	if (fstat(a,b) != 0) printf("Can't fstat %d\n", a)
#define Time(t)		if (time(t) == (time_t)-1) printf("Time error\n")

#include "common.c"

int subtest;

void test8a(void);
void test8b(void);

int main(int argc, char *argv[])
{
  int i, m = 0xFFFF;

  if (argc == 2) m = atoi(argv[1]);
  start(8);
  for (i = 0; i < ITERATIONS; i++) {
	if (m & 0001) test8a();
	if (m & 0002) test8b();
  }
  quit();
  return(-1);	/* Unreachable */
}

void test8a()
{				/* Test fcntl flags. */
  int tube[2], t1[2], t2[2], t3[2];
  time_t time1, time2;
  char buf[128];
  struct stat st1, st2;
  int stat_loc, flags;

  subtest = 1;

  /* Check if lowest fds are returned. */
  if (pipe(tube) != 0) e(1);
  if (tube[0] != 3 && tube[1] != 3) e(2);
  if (tube[1] != 4 && tube[0] != 4) e(3);
  if (tube[1] == tube[0]) e(4);
  if (pipe(t1) != 0) e(5);
  if (t1[0] != 5 && t1[1] != 5) e(6);
  if (t1[1] != 6 && t1[0] != 6) e(7);
  if (t1[1] == t1[0]) e(8);
  if (close(t1[0]) != 0) e(9);
  if (close(tube[0]) != 0) e(10);
  if (pipe(t2) != 0) e(11);
  if (t2[0] != tube[0] && t2[1] != tube[0]) e(12);
  if (t2[1] != t1[0] && t2[0] != t1[0]) e(13);
  if (t2[1] == t2[0]) e(14);
  if (pipe(t3) != 0) e(15);
  if (t3[0] != 7 && t3[1] != 7) e(16);
  if (t3[1] != 8 && t3[0] != 8) e(17);
  if (t3[1] == t3[0]) e(18);
  if (close(tube[1]) != 0) e(19);
  if (close(t1[1]) != 0) e(20);
  if (close(t2[0]) != 0) e(21);
  if (close(t2[1]) != 0) e(22);
  if (close(t3[0]) != 0) e(23);
  if (close(t3[1]) != 0) e(24);

  /* All time fields should be marked for update. */
  Time(&time1);
  if (pipe(tube) != 0) e(25);
  Fstat(tube[0], &st1);
  Fstat(tube[1], &st2);
  Time(&time2);
  if (st1.st_atime < time1) e(26);
  if (st1.st_ctime < time1) e(27);
  if (st1.st_mtime < time1) e(28);
  if (st1.st_atime > time2) e(29);
  if (st1.st_ctime > time2) e(30);
  if (st1.st_mtime > time2) e(31);
  if (st2.st_atime < time1) e(32);
  if (st2.st_ctime < time1) e(33);
  if (st2.st_mtime < time1) e(34);
  if (st2.st_atime > time2) e(35);
  if (st2.st_ctime > time2) e(36);
  if (st2.st_mtime > time2) e(37);

  /* Check the file characteristics. */
  if ((flags = fcntl(tube[0], F_GETFD)) != 0) e(38);
  if ((flags & FD_CLOEXEC) != 0) e(39);
  if ((flags = fcntl(tube[0], F_GETFL)) != 0) e(40);
  if ((flags & O_RDONLY) != O_RDONLY) e(41);
  if ((flags & O_NONBLOCK) != 0) e(42);
  if ((flags & O_RDWR) != 0) e(43);
  if ((flags & O_WRONLY) != 0) e(44);

  if ((flags = fcntl(tube[1], F_GETFD)) != 0) e(45);
  if ((flags & FD_CLOEXEC) != 0) e(46);
  if ((flags = fcntl(tube[1], F_GETFL)) == -1) e(47);
  if ((flags & O_WRONLY) != O_WRONLY) e(48);
  if ((flags & O_NONBLOCK) != 0) e(49);
  if ((flags & O_RDWR) != 0) e(50);
  if ((flags & O_RDONLY) != 0) e(51);

  /* Check if we can read and write. */
  switch (fork()) {
      case -1:	printf("Can't fork\n");	break;
      case 0:
	alarm(20);
	if (close(tube[0]) != 0) e(52);
	if (write(tube[1], "Hello", 6) != 6) e(53);
	if (close(tube[1]) != 0) e(54);
	exit(0);
      default:
	if (read(tube[0], buf, sizeof(buf)) != 6) e(55);
	if (strncmp(buf, "Hello", 6) != 0) e(56);
	wait(&stat_loc);
	if (stat_loc != 0) e(57);	/* Alarm? */
  }
  if (close(tube[0]) != 0) e(58);
  if (close(tube[1]) != 0) e(59);
}

void test8b()
{
  int tube[2], child2parent[2], parent2child[2];
  int i, nchild = 0, nopen = 3, stat_loc;
  int fd;
  int forkfailed = 0;
  char c;

  subtest = 2;

  /* Take all the pipes we can get. */
  while (nopen < OPEN_MAX - 2) {
	if (pipe(tube) != 0) {
		/* We have not reached OPEN_MAX yet, so we have ENFILE. */
		if (errno != ENFILE) e(1);
		sleep(2);	/* Wait for others to (maybe) closefiles. */
		break;
	}
	nopen += 2;
  }

  if (nopen < OPEN_MAX - 2) {
	if (pipe(tube) != -1) e(2);
	switch (errno) {
	    case EMFILE:	/* Errno value is ok. */
		break;
	    case ENFILE:	/* No process can open files any more. */
		switch (fork()) {
		    case -1:
			printf("Can't fork\n");
			break;
		    case 0:
			alarm(20);
			if (open("/", O_RDONLY) != -1) e(3);
			if (errno != ENFILE) e(4);
			exit(0);
		    default:
			wait(&stat_loc);
			if (stat_loc != 0) e(5);	/* Alarm? */
		}
		break;
	    default:		/* Wrong value for errno. */
		e(6);
	}
  }

  /* Close all but stdin,out,err. */
  for (i = 3; i < OPEN_MAX; i++) (void) close(i);

  /* ENFILE test. Have children each grab OPEN_MAX fds. */
  if (pipe(child2parent) != 0) e(7);
  if (pipe(parent2child) != 0) e(8);
  while (!forkfailed && (fd = open("/", O_RDONLY)) != -1) {
	close(fd);
	switch (fork()) {
	    case -1:
		forkfailed = 1;
		break;
	    case 0:
		alarm(60);

		/* Grab all the fds. */
		while (pipe(tube) != -1);
		while (open("/", O_RDONLY) != -1);

		/* Signal parent OPEN_MAX fds gone. */
		if (write(child2parent[1], "*", 1) != 1) e(9);

		/* Wait for parent befor freeing all the fds. */
		if (read(parent2child[0], &c, 1) != 1) e(10);
		exit(0);
	    default:

		/* Wait for child to grab OPEN_MAX fds. */
		if (read(child2parent[0], &c, 1) != 1) e(11);
		nchild++;
		break;
	}
  }

  if (!forkfailed) {
	if (pipe(tube) != -1) e(12);
	if (errno != ENFILE) e(13);
  }

  /* Signal children to die and wait for it. */
  while (nchild-- > 0) {
	if (write(parent2child[1], "*", 1) != 1) e(14);
	wait(&stat_loc);
	if (stat_loc != 0) e(15);	/* Alarm? */
  }

  /* Close all but stdin,out,err. */
  for (i = 3; i < OPEN_MAX; i++) (void) close(i);
}

