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