[LTP] [PATCH] pipe/pipe15.c: Adjust fd check for pipe creation

[xuwenjie04]

A pipe occupies 2 fds, and considering 3 standard fds,
we should compare rlim_max with such *2+3 calculated value
to verify whether the maximum file descriptor configuration
of the current machine is sufficient.

Signed-off-by: Wenjie Xu <xuwenjie04@baidu.com>
---
testcases/kernel/syscalls/pipe/pipe15.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/pipe/pipe15.c b/testcases/kernel/syscalls/pipe/pipe15.c
index c85ad1820..9e02fe2eb 100644
--- a/testcases/kernel/syscalls/pipe/pipe15.c
+++ b/testcases/kernel/syscalls/pipe/pipe15.c
@@ -59,7 +59,7 @@ static void setup(void)
      tst_res(TINFO, "Creating %i pipes", pipe_count);

      SAFE_GETRLIMIT(RLIMIT_NOFILE, &nfd);
-     if (nfd.rlim_max < (unsigned long)pipe_count)
+    if (nfd.rlim_max < (unsigned long)pipe_count * 2 + 3)
             tst_brk(TCONF, "NOFILE limit max too low: %lu < %i", nfd.rlim_max, pipe_count);
      if (nfd.rlim_cur < nfd.rlim_max) {
             nfd.rlim_cur = nfd.rlim_max;
--
2.41.0

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