1/* Check that writing an inordinate amount of data works (somewhat).
2#notarget: cris*-*-elf
3#output: got: a\nexit: 0\n
4   This test-case will *not* work on host (or for real): the first
5   pipemax+1 bytes will be successfully written.  It's just for
6   exercising a rare execution path.  */
7
8#include <stddef.h>
9#include <stdlib.h>
10#include <stdio.h>
11#include <limits.h>
12#include <unistd.h>
13#include <sched.h>
14#include <signal.h>
15#include <errno.h>
16#include <sys/types.h>
17#include <sys/wait.h>
18
19int pip[2];
20
21int pipemax;
22
23int
24process (void *arg)
25{
26  char *s = arg;
27  char *buf = calloc (pipemax * 100, 1);
28  int ret;
29
30  if (buf == NULL)
31    abort ();
32
33  *buf = *s;
34
35  ret = write (pip[1], buf, pipemax * 100);
36  if (ret != -1 || errno != EFBIG)
37    {
38      perror ("write");
39      abort ();
40    }
41
42  return 0;
43}
44
45int
46main (void)
47{
48  int retcode;
49  int pid;
50  int st = 0;
51  long stack[16384];
52  char buf[1];
53
54  retcode = pipe (pip);
55
56  if (retcode != 0)
57    {
58      fprintf (stderr, "Bad pipe %d\n", retcode);
59      abort ();
60    }
61
62#ifdef PIPE_MAX
63  pipemax = PIPE_MAX;
64#else
65  pipemax = fpathconf (pip[1], _PC_PIPE_BUF);
66#endif
67
68  if (pipemax <= 0)
69    {
70      fprintf (stderr, "Bad pipemax %d\n", pipemax);
71      abort ();
72    }
73
74  pid = clone (process, (char *) stack + sizeof (stack) - 64,
75	       (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
76	       | SIGCHLD, "ab");
77  if (pid <= 0)
78    {
79      fprintf (stderr, "Bad clone %d\n", pid);
80      abort ();
81    }
82
83  while ((retcode = read (pip[0], buf, 1)) == 0)
84    ;
85
86  if (retcode != 1)
87    {
88      fprintf (stderr, "Bad read 1: %d\n", retcode);
89      abort ();
90    }
91
92  printf ("got: %c\n", buf[0]);
93
94  if (close (pip[0]) != 0)
95    {
96      perror ("pip close");
97      abort ();
98    }
99
100  retcode = waitpid (pid, &st, __WALL);
101
102  if (retcode != pid || !WIFEXITED (st))
103    {
104      fprintf (stderr, "Bad wait %d:%d %x\n", pid, retcode, st);
105      perror ("errno");
106      abort ();
107    }
108
109  printf ("exit: %d\n", WEXITSTATUS (st));
110  return 0;
111}
112