Record Case Detail

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 pwd: /out/package
ppid: 5137
   1: WRITELN /bin/ls &
   2: WRITELN sleep 0.2
   3: WRITELN /bin/ls | cat &
   4: WRITELN sleep 0.2
   5: WRITELN exit
exit: 1

Your answer may be identical to the JOJ answer in the first several lines.

However, the main problem you meet now is Runtime Error. And the exit code of your program is 1, which should be 0.

Please double check your code to solve this problem and try again.

mumsh $ /bin/ls: cannot access '&': No such file or directory
cat: '&': No such file or directory
/bin/ls: write error: Broken pipe

=================================================================
==5138==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 40 byte(s) in 4 object(s) allocated from:
    #0 0x4dd350  (/out/package/mumsh_memory_check+0x4dd350)
    #1 0x51ce19  (/out/package/mumsh_memory_check+0x51ce19)
    #2 0x517258  (/out/package/mumsh_memory_check+0x517258)
    #3 0x515e17  (/out/package/mumsh_memory_check+0x515e17)
    #4 0x7f9a24ac6b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

SUMMARY: AddressSanitizer: 40 byte(s) leaked in 4 allocation(s).

mumsh $ [1] /bin/ls &
mumsh $ driver
mumsh
mumsh_memory_check
mumsh $ [2] /bin/ls | cat &
mumsh $ driver
mumsh
mumsh_memory_check
mumsh $ exit

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JOJ Answer