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Clarify how a file descriptor could still be more than the limit

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It can happen if the file descriptor was opened before lowering the limit.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-03-01 11:43:22 +01:00
parent 97c57fe439
commit 574cf7b59f
1 changed files with 4 additions and 0 deletions
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4
tests/suites/test_suite_net.function
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@ -94,6 +94,10 @@ void poll_beyond_fd_setsize( )
* If the limit can't be raised, a file descriptor opened by the * If the limit can't be raised, a file descriptor opened by the
* net_sockets module will be less than FD_SETSIZE, so the test * net_sockets module will be less than FD_SETSIZE, so the test
* is not necessary and we mark it as skipped. * is not necessary and we mark it as skipped.
* A file descriptor could still be higher than FD_SETSIZE if it was
* opened before the limit was lowered (which is something an application
* might do); but we don't do such things in our test code, so the unit
* test will run if it can.
*/ */
TEST_ASSERT( getrlimit( RLIMIT_NOFILE, &rlim_nofile ) == 0 ); TEST_ASSERT( getrlimit( RLIMIT_NOFILE, &rlim_nofile ) == 0 );
if( rlim_nofile.rlim_cur < FD_SETSIZE + 1 ) if( rlim_nofile.rlim_cur < FD_SETSIZE + 1 )