Re: [LTP] [QUESTION] about test execve04 which testing for EMFILE

[Wei Yongjun <yjwei@cn.fujitsu.com>]

Subrata Modak wrote:
> On Fri, 2009-05-22 at 17:26 +0800, Wei Yongjun wrote: 
>   
>> recently kernel commit e7b9b550f53e81ea38e71d322d6f95730df058a2
>> has removed the file get code. The execve syscall will never
>> return EMFILE.
>>
>> Call to execve() will be suceess even if the the process has the
>> maximum number of files open, because execve() never open any file.
>>
>> Can anyone tell me what does this test case test for? It be wrote
>> base on which document? Just the man page?
>>     
>
> * DESCRIPTION
> *      Testcase to check execve(2) sets errno to EMFILE correctly
> *
> * ALGORITHM
> *      Get the configured file descriptor table size. open(2) files to
> fill
> *      up the file descriptor table. Once file descriptor table is full,
> *      an attempt to execve(2) any other executable fails with EMFILE.
>
> is what the source description says. Can you please execute the test
> against that kernel commit and share the results with/without commits ?
>   

Test without that commit:
# ./execve04 -F ./test3
execve04 1 PASS : Expected failure - 24 : Too many open files

Test with that commit:
# ./execve04 -F ./test3
<program name unknown>: error while loading shared libraries: libc.so.6:
cannot open shared object file: Error 24
execve04 1 FAIL :
execve(/home/weiyj/ltp/testcases/kernel/syscalls/execve/./test3) failed:
expected EMFILE(24), got 127 (Key has expired)

Test with that commit but I compiled test3 with --static:
# gcc test3.c -o test3 --static
# ./execve04 -F ./test3
Hello World
execve04 1 FAIL :
execve(/home/weiyj/ltp/testcases/kernel/syscalls/execve/./test3) failed:
expected EMFILE(24), got 0 (Success)

The latest kernel do execve(2) without get file descriptor, it only
need one file struct. It seem that this test is obsoleted.



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