Record Case Detail

This function is in beta test. Please help improve it in the issues here.

 pwd: /out/package
ppid: 4914
   1: WRITELN echo 123 >
   2: WRITELN 1.txt
   3: WRITELN cat 1.txt
   4: WRITELN ls
   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 $ /in/mumsh.c:72:7: runtime error: load of null pointer of type 'char'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /in/mumsh.c:72:7 in 
AddressSanitizer:DEADLYSIGNAL
=================================================================
==4915==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x000000515f92 bp 0x7fff20cb8250 sp 0x7fff20cb7900 T0)
==4915==The signal is caused by a READ memory access.
==4915==Hint: address points to the zero page.
    #0 0x515f91  (/out/package/mumsh_memory_check+0x515f91)
    #1 0x516e1c  (/out/package/mumsh_memory_check+0x516e1c)
    #2 0x7f117d34cb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #3 0x41cff9  (/out/package/mumsh_memory_check+0x41cff9)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/out/package/mumsh_memory_check+0x515f91) 
==4915==ABORTING

mumsh $ > mumsh $ 123
mumsh $ 1.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

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JOJ Answer