test/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 #define MAX_ERROR       4
  28 #define ITERATIONS     10
  29
  30 #define System(cmd)     if (system(cmd) != 0) printf("``%s'' failed\n", cmd)
  31 #define Chdir(dir)      if (chdir(dir) != 0) printf("Can't goto %s\n", dir)
  32 #define Stat(a,b)       if (stat(a,b) != 0) printf("Can't stat %s\n", a)
  33
  34 #define IS_CLOEXEC(fd)  ((fcntl(fd, F_GETFD) & FD_CLOEXEC) == FD_CLOEXEC)
  35 #define SET_CLOEXEC(fd) fcntl(fd, F_SETFD, FD_CLOEXEC)
  36
  37 #include "common.c"
  38
  39 int superuser;
  40
  41 void test29a(void);
  42 void test29b(void);
  43 void test29c(void);
  44
  45 int main(int argc, char *argv[])
  46 {
  47   int i, m = 0xFFFF;
  48
  49   sync();
  50   if (argc == 2) m = atoi(argv[1]);
  51
  52   start(29);
  53   superuser = (geteuid() == 0);
  54
  55   for (i = 0; i < ITERATIONS; i++) {
  56         if (m & 0001) test29a();
  57         if (m & 0002) test29b();
  58         if (m & 0004) test29c();
  59   }
  60   quit();
  61
  62   return(-1);   /* Unreachable */
  63 }
  64
  65 void test29a()
  66 {
  67   int fd1, fd2, fd3, fd4, fd5;
  68   struct flock flock;
  69
  70   subtest = 1;
  71
  72   /* Basic checking. */
  73   if ((fd1 = dup(0)) != 3) e(1);
  74   if ((fd2 = dup(0)) != 4) e(2);
  75   if ((fd3 = dup(0)) != 5) e(3);
  76   if ((fd4 = dup(0)) != 6) e(4);
  77   if ((fd5 = dup(0)) != 7) e(5);
  78   if (close(fd2) != 0) e(6);
  79   if (close(fd4) != 0) e(7);
  80   if ((fd2 = dup(0)) != 4) e(8);
  81   if ((fd4 = dup(0)) != 6) e(9);
  82   if (close(fd1) != 0) e(10);
  83   if (close(fd3) != 0) e(11);
  84   if (close(fd5) != 0) e(12);
  85   if ((fd1 = dup(0)) != 3) e(13);
  86   if ((fd3 = dup(0)) != 5) e(14);
  87   if ((fd5 = dup(0)) != 7) e(15);
  88   if (close(fd1) != 0) e(16);
  89   if (close(fd2) != 0) e(17);
  90   if (close(fd3) != 0) e(18);
  91   if (close(fd4) != 0) e(19);
  92   if (close(fd5) != 0) e(20);
  93
  94   /* FD_CLOEXEC should be cleared. */
  95   if ((fd1 = dup(0)) != 3) e(21);
  96   if (SET_CLOEXEC(fd1) == -1) e(22);
  97   if (!IS_CLOEXEC(fd1)) e(23);
  98   if ((fd2 = dup(fd1)) != 4) e(24);
  99   if ((fd3 = dup(fd2)) != 5) e(25);
 100   if (IS_CLOEXEC(fd2)) e(26);
 101   if (IS_CLOEXEC(fd3)) e(27);
 102   if (SET_CLOEXEC(fd2) == -1) e(28);
 103   if (!IS_CLOEXEC(fd2)) e(29);
 104   if (IS_CLOEXEC(fd3)) e(30);
 105   if (close(fd1) != 0) e(31);
 106   if (close(fd2) != 0) e(32);
 107   if (close(fd3) != 0) e(33);
 108
 109   /* Locks should be shared, so we can lock again. */
 110   System("echo 'Hallo' > file");
 111   if ((fd1 = open("file", O_RDWR)) != 3) e(34);
 112   flock.l_whence = SEEK_SET;
 113   flock.l_start = 0;
 114   flock.l_len = 10;
 115   flock.l_type = F_WRLCK;
 116   if (fcntl(fd1, F_SETLK, &flock) == -1) e(35);
 117   if (fcntl(fd1, F_SETLK, &flock) == -1) e(36);
 118   if ((fd2 = dup(fd1)) != 4) e(37);
 119   if (fcntl(fd1, F_SETLK, &flock) == -1) e(38);
 120   if (fcntl(fd1, F_GETLK, &flock) == -1) e(39);
 121 #if 0 /* XXX - see test7.c */
 122   if (flock.l_type != F_WRLCK) e(40);
 123   if (flock.l_pid != getpid()) e(41);
 124 #endif /* 0 */
 125   flock.l_type = F_WRLCK;
 126   if (fcntl(fd2, F_GETLK, &flock) == -1) e(42);
 127 #if 0 /* XXX - see test7.c */
 128   if (flock.l_type != F_WRLCK) e(43);
 129   if (flock.l_pid != getpid()) e(44);
 130 #endif /* 0 */
 131   if (close(fd1) != 0) e(45);
 132   if (close(fd2) != 0) e(46);
 133
 134   System("rm -rf ../DIR_29/*");
 135 }
 136
 137 void test29b()
 138 {
 139   int fd;
 140   char buf[32];
 141
 142   subtest = 2;
 143
 144   /* Test file called ``file''. */
 145   System("echo 'Hallo!' > file");
 146
 147   /* Check dup2() call with the same fds. Should have no effect. */
 148   if ((fd = open("file", O_RDONLY)) != 3) e(1);
 149   if (read(fd, buf, 2) != 2) e(2);
 150   if (strncmp(buf, "Ha", 2) != 0) e(3);
 151   if (dup2(fd, fd) != fd) e(4);
 152   if (read(fd, buf, 2) != 2) e(5);
 153   if (strncmp(buf, "ll", 2) != 0) e(6);
 154   if (dup2(fd, fd) != fd) e(7);
 155   if (read(fd, buf, 2) != 2) e(8);
 156   if (strncmp(buf, "o!", 2) != 0) e(9);
 157   if (close(fd) != 0) e(10);
 158
 159   /* If dup2() call fails, the fildes2 argument has to stay open. */
 160   if ((fd = open("file", O_RDONLY)) != 3) e(11);
 161   if (read(fd, buf, 2) != 2) e(12);
 162   if (strncmp(buf, "Ha", 2) != 0) e(13);
 163   if (dup2(OPEN_MAX + 3, fd) != -1) e(14);
 164   if (errno != EBADF) e(15);
 165   if (read(fd, buf, 2) != 2) e(16);
 166   if (strncmp(buf, "ll", 2) != 0) e(17);
 167   if (dup2(-4, fd) != -1) e(18);
 168   if (errno != EBADF) e(19);
 169   if (read(fd, buf, 2) != 2) e(20);
 170   if (strncmp(buf, "o!", 2) != 0) e(21);
 171   if (close(fd) != 0) e(22);
 172
 173   System("rm -rf ../DIR_29/*");
 174 }
 175
 176 void test29c()
 177 {
 178   int i;
 179
 180   subtest = 3;
 181
 182   /* Check bad arguments to dup() and dup2(). */
 183   for (i = -OPEN_MAX; i < OPEN_MAX * 2; i++) {
 184
 185         /* ``i'' is a valid and open fd. */
 186         if (i >= 0 && i < 3) continue;
 187
 188         /* If ``i'' is a valid fd it is not open. */
 189         if (dup(i) != -1) e(1);
 190         if (errno != EBADF) e(2);
 191
 192         /* ``i'' Is OPEN_MAX. */
 193         if (i == OPEN_MAX) {
 194                 if (dup2(0, i) != -1) e(3);
 195                 if (errno != EINVAL) e(4);
 196         }
 197
 198         /* ``i'' Is out of range. */
 199         if (i < 0 || i > OPEN_MAX) {
 200                 if (dup2(0, i) != -1) e(5);
 201                 if (errno != EBADF) e(6);
 202         }
 203   }
 204
 205   System("rm -rf ../DIR_29/*");
 206 }