test/test8.c

   1 /* test8: pipe()                Author: Jan-Mark Wams (jms@cs.vu.nl) */
   2
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <sys/wait.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <string.h>
   9 #include <fcntl.h>
  10 #include <limits.h>
  11 #include <errno.h>
  12 #include <time.h>
  13 #include <stdio.h>
  14
  15 int max_error =         4;
  16 #include "common.h"
  17
  18 #define ITERATIONS     60
  19
  20 #define Fstat(a,b)      if (fstat(a,b) != 0) printf("Can't fstat %d\n", a)
  21 #define Time(t)         if (time(t) == (time_t)-1) printf("Time error\n")
  22
  23
  24 int subtest;
  25
  26 void test8a(void);
  27 void test8b(void);
  28
  29 int main(int argc, char *argv[])
  30 {
  31   int i, m = 0xFFFF;
  32
  33   if (argc == 2) m = atoi(argv[1]);
  34   start(8);
  35   for (i = 0; i < ITERATIONS; i++) {
  36         if (m & 0001) test8a();
  37         if (m & 0002) test8b();
  38   }
  39   quit();
  40   return(-1);   /* Unreachable */
  41 }
  42
  43 void test8a()
  44 {                               /* Test fcntl flags. */
  45   int tube[2], t1[2], t2[2], t3[2];
  46   time_t time1, time2;
  47   char buf[128];
  48   struct stat st1, st2;
  49   int stat_loc, flags;
  50
  51   subtest = 1;
  52
  53   /* Check if lowest fds are returned. */
  54   if (pipe(tube) != 0) e(1);
  55   if (tube[0] != 3 && tube[1] != 3) e(2);
  56   if (tube[1] != 4 && tube[0] != 4) e(3);
  57   if (tube[1] == tube[0]) e(4);
  58   if (pipe(t1) != 0) e(5);
  59   if (t1[0] != 5 && t1[1] != 5) e(6);
  60   if (t1[1] != 6 && t1[0] != 6) e(7);
  61   if (t1[1] == t1[0]) e(8);
  62   if (close(t1[0]) != 0) e(9);
  63   if (close(tube[0]) != 0) e(10);
  64   if (pipe(t2) != 0) e(11);
  65   if (t2[0] != tube[0] && t2[1] != tube[0]) e(12);
  66   if (t2[1] != t1[0] && t2[0] != t1[0]) e(13);
  67   if (t2[1] == t2[0]) e(14);
  68   if (pipe(t3) != 0) e(15);
  69   if (t3[0] != 7 && t3[1] != 7) e(16);
  70   if (t3[1] != 8 && t3[0] != 8) e(17);
  71   if (t3[1] == t3[0]) e(18);
  72   if (close(tube[1]) != 0) e(19);
  73   if (close(t1[1]) != 0) e(20);
  74   if (close(t2[0]) != 0) e(21);
  75   if (close(t2[1]) != 0) e(22);
  76   if (close(t3[0]) != 0) e(23);
  77   if (close(t3[1]) != 0) e(24);
  78
  79   /* All time fields should be marked for update. */
  80   Time(&time1);
  81   if (pipe(tube) != 0) e(25);
  82   Fstat(tube[0], &st1);
  83   Fstat(tube[1], &st2);
  84   Time(&time2);
  85   if (st1.st_atime < time1) e(26);
  86   if (st1.st_ctime < time1) e(27);
  87   if (st1.st_mtime < time1) e(28);
  88   if (st1.st_atime > time2) e(29);
  89   if (st1.st_ctime > time2) e(30);
  90   if (st1.st_mtime > time2) e(31);
  91   if (st2.st_atime < time1) e(32);
  92   if (st2.st_ctime < time1) e(33);
  93   if (st2.st_mtime < time1) e(34);
  94   if (st2.st_atime > time2) e(35);
  95   if (st2.st_ctime > time2) e(36);
  96   if (st2.st_mtime > time2) e(37);
  97
  98   /* Check the file characteristics. */
  99   if ((flags = fcntl(tube[0], F_GETFD)) != 0) e(38);
 100   if ((flags & FD_CLOEXEC) != 0) e(39);
 101   if ((flags = fcntl(tube[0], F_GETFL)) != 0) e(40);
 102   if ((flags & O_RDONLY) != O_RDONLY) e(41);
 103   if ((flags & O_NONBLOCK) != 0) e(42);
 104   if ((flags & O_RDWR) != 0) e(43);
 105   if ((flags & O_WRONLY) != 0) e(44);
 106
 107   if ((flags = fcntl(tube[1], F_GETFD)) != 0) e(45);
 108   if ((flags & FD_CLOEXEC) != 0) e(46);
 109   if ((flags = fcntl(tube[1], F_GETFL)) == -1) e(47);
 110   if ((flags & O_WRONLY) != O_WRONLY) e(48);
 111   if ((flags & O_NONBLOCK) != 0) e(49);
 112   if ((flags & O_RDWR) != 0) e(50);
 113   if ((flags & O_RDONLY) != 0) e(51);
 114
 115   /* Check if we can read and write. */
 116   switch (fork()) {
 117       case -1:  printf("Can't fork\n"); break;
 118       case 0:
 119         alarm(20);
 120         if (close(tube[0]) != 0) e(52);
 121         if (write(tube[1], "Hello", 6) != 6) e(53);
 122         if (close(tube[1]) != 0) e(54);
 123         exit(0);
 124       default:
 125         if (read(tube[0], buf, sizeof(buf)) != 6) e(55);
 126         if (strncmp(buf, "Hello", 6) != 0) e(56);
 127         wait(&stat_loc);
 128         if (stat_loc != 0) e(57);       /* Alarm? */
 129   }
 130   if (close(tube[0]) != 0) e(58);
 131   if (close(tube[1]) != 0) e(59);
 132 }
 133
 134 void test8b()
 135 {
 136   int tube[2], child2parent[2], parent2child[2];
 137   int i, nchild = 0, nopen = 3, stat_loc;
 138   int fd;
 139   int forkfailed = 0;
 140   char c;
 141
 142   subtest = 2;
 143
 144   /* Take all the pipes we can get. */
 145   while (nopen < OPEN_MAX - 2) {
 146         if (pipe(tube) != 0) {
 147                 /* We have not reached OPEN_MAX yet, so we have ENFILE. */
 148                 if (errno != ENFILE) e(1);
 149                 sleep(2);       /* Wait for others to (maybe) closefiles. */
 150                 break;
 151         }
 152         nopen += 2;
 153   }
 154
 155   if (nopen < OPEN_MAX - 2) {
 156         if (pipe(tube) != -1) e(2);
 157         switch (errno) {
 158             case EMFILE:        /* Errno value is ok. */
 159                 break;
 160             case ENFILE:        /* No process can open files any more. */
 161                 switch (fork()) {
 162                     case -1:
 163                         printf("Can't fork\n");
 164                         break;
 165                     case 0:
 166                         alarm(20);
 167                         if (open("/", O_RDONLY) != -1) e(3);
 168                         if (errno != ENFILE) e(4);
 169                         exit(0);
 170                     default:
 171                         wait(&stat_loc);
 172                         if (stat_loc != 0) e(5);        /* Alarm? */
 173                 }
 174                 break;
 175             default:            /* Wrong value for errno. */
 176                 e(6);
 177         }
 178   }
 179
 180   /* Close all but stdin,out,err. */
 181   for (i = 3; i < OPEN_MAX; i++) (void) close(i);
 182
 183   /* ENFILE test. Have children each grab OPEN_MAX fds. */
 184   if (pipe(child2parent) != 0) e(7);
 185   if (pipe(parent2child) != 0) e(8);
 186   while (!forkfailed && (fd = open("/", O_RDONLY)) != -1) {
 187         close(fd);
 188         switch (fork()) {
 189             case -1:
 190                 forkfailed = 1;
 191                 break;
 192             case 0:
 193                 alarm(60);
 194
 195                 /* Grab all the fds. */
 196                 while (pipe(tube) != -1);
 197                 while (open("/", O_RDONLY) != -1);
 198
 199                 /* Signal parent OPEN_MAX fds gone. */
 200                 if (write(child2parent[1], "*", 1) != 1) e(9);
 201
 202                 /* Wait for parent befor freeing all the fds. */
 203                 if (read(parent2child[0], &c, 1) != 1) e(10);
 204                 exit(0);
 205             default:
 206
 207                 /* Wait for child to grab OPEN_MAX fds. */
 208                 if (read(child2parent[0], &c, 1) != 1) e(11);
 209                 nchild++;
 210                 break;
 211         }
 212   }
 213
 214   if (!forkfailed) {
 215         if (pipe(tube) != -1) e(12);
 216         if (errno != ENFILE) e(13);
 217   }
 218
 219   /* Signal children to die and wait for it. */
 220   while (nchild-- > 0) {
 221         if (write(parent2child[1], "*", 1) != 1) e(14);
 222         wait(&stat_loc);
 223         if (stat_loc != 0) e(15);       /* Alarm? */
 224   }
 225
 226   /* Close all but stdin,out,err. */
 227   for (i = 3; i < OPEN_MAX; i++) (void) close(i);
 228 }
 229