minix/tests/test29.c

   1 /* test29: dup() dup2()         Author: Jan-Mark Wams (jms@cs.vu.nl) */
   2
   3 /* The definition of ``dup2()'' is realy a big mess! For:
   4 **
   5 ** (1) if fildes2 is less than zero or greater than {OPEN_MAX}
   6 **     errno has to set to [EBADF]. But if fildes2 equals {OPEN_MAX}
   7 **     errno has to be set to [EINVAL]. And ``fcntl(F_DUPFD...)'' always
   8 **     returns [EINVAL] if fildes2 is out of range!
   9 **
  10 ** (2) if the number of file descriptors would exceed {OPEN_MAX}, or no
  11 **     file descriptors above fildes2 are available, errno has to be set
  12 **     to [EMFILE]. But this can never occur!
  13 */
  14
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/wait.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <fcntl.h>
  22 #include <limits.h>
  23 #include <errno.h>
  24 #include <time.h>
  25 #include <stdio.h>
  26
  27 int max_error =         4;
  28 #include "common.h"
  29
  30 #define ITERATIONS     10
  31
  32 #define System(cmd)     if (system(cmd) != 0) printf("``%s'' failed\n", cmd)
  33 #define Chdir(dir)      if (chdir(dir) != 0) printf("Can't goto %s\n", dir)
  34 #define Stat(a,b)       if (stat(a,b) != 0) printf("Can't stat %s\n", a)
  35
  36 #define IS_CLOEXEC(fd)  ((fcntl(fd, F_GETFD) & FD_CLOEXEC) == FD_CLOEXEC)
  37 #define SET_CLOEXEC(fd) fcntl(fd, F_SETFD, FD_CLOEXEC)
  38
  39
  40 int superuser;
  41
  42 void test29a(void);
  43 void test29b(void);
  44 void test29c(void);
  45
  46 int main(int argc, char *argv[])
  47 {
  48   int i, m = 0xFFFF;
  49
  50   sync();
  51   if (argc == 2) m = atoi(argv[1]);
  52
  53   start(29);
  54   superuser = (geteuid() == 0);
  55
  56   for (i = 0; i < ITERATIONS; i++) {
  57         if (m & 0001) test29a();
  58         if (m & 0002) test29b();
  59         if (m & 0004) test29c();
  60   }
  61   quit();
  62
  63   return(-1);   /* Unreachable */
  64 }
  65
  66 void test29a()
  67 {
  68   int fd1, fd2, fd3, fd4, fd5;
  69   struct flock flock;
  70
  71   subtest = 1;
  72
  73   /* Basic checking. */
  74   if ((fd1 = dup(0)) != 3) e(1);
  75   if ((fd2 = dup(0)) != 4) e(2);
  76   if ((fd3 = dup(0)) != 5) e(3);
  77   if ((fd4 = dup(0)) != 6) e(4);
  78   if ((fd5 = dup(0)) != 7) e(5);
  79   if (close(fd2) != 0) e(6);
  80   if (close(fd4) != 0) e(7);
  81   if ((fd2 = dup(0)) != 4) e(8);
  82   if ((fd4 = dup(0)) != 6) e(9);
  83   if (close(fd1) != 0) e(10);
  84   if (close(fd3) != 0) e(11);
  85   if (close(fd5) != 0) e(12);
  86   if ((fd1 = dup(0)) != 3) e(13);
  87   if ((fd3 = dup(0)) != 5) e(14);
  88   if ((fd5 = dup(0)) != 7) e(15);
  89   if (close(fd1) != 0) e(16);
  90   if (close(fd2) != 0) e(17);
  91   if (close(fd3) != 0) e(18);
  92   if (close(fd4) != 0) e(19);
  93   if (close(fd5) != 0) e(20);
  94
  95   /* FD_CLOEXEC should be cleared. */
  96   if ((fd1 = dup(0)) != 3) e(21);
  97   if (SET_CLOEXEC(fd1) == -1) e(22);
  98   if (!IS_CLOEXEC(fd1)) e(23);
  99   if ((fd2 = dup(fd1)) != 4) e(24);
 100   if ((fd3 = dup(fd2)) != 5) e(25);
 101   if (IS_CLOEXEC(fd2)) e(26);
 102   if (IS_CLOEXEC(fd3)) e(27);
 103   if (SET_CLOEXEC(fd2) == -1) e(28);
 104   if (!IS_CLOEXEC(fd2)) e(29);
 105   if (IS_CLOEXEC(fd3)) e(30);
 106   if (close(fd1) != 0) e(31);
 107   if (close(fd2) != 0) e(32);
 108   if (close(fd3) != 0) e(33);
 109
 110   /* Locks should be shared, so we can lock again. */
 111   System("echo 'Hallo' > file");
 112   if ((fd1 = open("file", O_RDWR)) != 3) e(34);
 113   flock.l_whence = SEEK_SET;
 114   flock.l_start = 0;
 115   flock.l_len = 10;
 116   flock.l_type = F_WRLCK;
 117   if (fcntl(fd1, F_SETLK, &flock) == -1) e(35);
 118   if (fcntl(fd1, F_SETLK, &flock) == -1) e(36);
 119   if ((fd2 = dup(fd1)) != 4) e(37);
 120   if (fcntl(fd1, F_SETLK, &flock) == -1) e(38);
 121   if (fcntl(fd1, F_GETLK, &flock) == -1) e(39);
 122 #if 0 /* XXX - see test7.c */
 123   if (flock.l_type != F_WRLCK) e(40);
 124   if (flock.l_pid != getpid()) e(41);
 125 #endif /* 0 */
 126   flock.l_type = F_WRLCK;
 127   if (fcntl(fd2, F_GETLK, &flock) == -1) e(42);
 128 #if 0 /* XXX - see test7.c */
 129   if (flock.l_type != F_WRLCK) e(43);
 130   if (flock.l_pid != getpid()) e(44);
 131 #endif /* 0 */
 132   if (close(fd1) != 0) e(45);
 133   if (close(fd2) != 0) e(46);
 134
 135   System("rm -rf ../DIR_29/*");
 136 }
 137
 138 void test29b()
 139 {
 140   int fd;
 141   char buf[32];
 142
 143   subtest = 2;
 144
 145   /* Test file called ``file''. */
 146   System("echo 'Hallo!' > file");
 147
 148   /* Check dup2() call with the same fds. Should have no effect. */
 149   if ((fd = open("file", O_RDONLY)) != 3) e(1);
 150   if (read(fd, buf, 2) != 2) e(2);
 151   if (strncmp(buf, "Ha", 2) != 0) e(3);
 152   if (dup2(fd, fd) != fd) e(4);
 153   if (read(fd, buf, 2) != 2) e(5);
 154   if (strncmp(buf, "ll", 2) != 0) e(6);
 155   if (dup2(fd, fd) != fd) e(7);
 156   if (read(fd, buf, 2) != 2) e(8);
 157   if (strncmp(buf, "o!", 2) != 0) e(9);
 158   if (close(fd) != 0) e(10);
 159
 160   /* If dup2() call fails, the fildes2 argument has to stay open. */
 161   if ((fd = open("file", O_RDONLY)) != 3) e(11);
 162   if (read(fd, buf, 2) != 2) e(12);
 163   if (strncmp(buf, "Ha", 2) != 0) e(13);
 164   if (dup2(OPEN_MAX + 3, fd) != -1) e(14);
 165   if (errno != EBADF) e(15);
 166   if (read(fd, buf, 2) != 2) e(16);
 167   if (strncmp(buf, "ll", 2) != 0) e(17);
 168   if (dup2(-4, fd) != -1) e(18);
 169   if (errno != EBADF) e(19);
 170   if (read(fd, buf, 2) != 2) e(20);
 171   if (strncmp(buf, "o!", 2) != 0) e(21);
 172   if (close(fd) != 0) e(22);
 173
 174   System("rm -rf ../DIR_29/*");
 175 }
 176
 177 void test29c()
 178 {
 179   int i;
 180
 181   subtest = 3;
 182
 183   /* Check bad arguments to dup() and dup2(). */
 184   for (i = -OPEN_MAX; i < OPEN_MAX * 2; i++) {
 185
 186         /* ``i'' is a valid and open fd. */
 187         if (i >= 0 && i < 3) continue;
 188
 189         /* If ``i'' is a valid fd it is not open. */
 190         if (dup(i) != -1) e(1);
 191         if (errno != EBADF) e(2);
 192
 193         /* ``i'' Is OPEN_MAX. */
 194         if (i == OPEN_MAX) {
 195                 if (dup2(0, i) != -1) e(3);
 196                 if (errno != EINVAL) e(4);
 197         }
 198
 199         /* ``i'' Is out of range. */
 200         if (i < 0 || i > OPEN_MAX) {
 201                 if (dup2(0, i) != -1) e(5);
 202                 if (errno != EBADF) e(6);
 203         }
 204   }
 205
 206   System("rm -rf ../DIR_29/*");
 207 }