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I run the command
./a.out < in &> output.txtI want the errors also to be placed in
output.txt.exit status of the command was 139 and on terminal its output was:
Segmentation fault (core dumped)
and the file output.txt was empty.
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Check shell limits Usually it is the limit on stack size that causes this kind of problem. To check memory limits, use the ulimit command in bash or ksh , or the limit command in csh or tcsh . Try setting the stacksize higher, and then re-run your program to see if the segfault goes away.
It can be resolved by having a base condition to return from the recursive function. A pointer must point to valid memory before accessing it.
Use a #define or the sizeof operator at all places where the array length is used. Improper handling of NULL terminated strings. Forgetting to allocate space for the terminating NULL character. Forgetting to set the terminating NULL character.
Dereferencing or assigning to an uninitialized pointer (wild pointer, which points to a random memory address) Dereferencing or assigning to a freed pointer (dangling pointer, which points to memory that has been freed/deallocated/deleted) A buffer overflow. A stack overflow.
The message Segmentation fault (core dumped) is not coming from your program.
It's produced by shell as result of a signal received by it. It's not a part of stderr or stdout of your program.
So shell's message can be captured as:
{ ./a.out; } 2> out_err
If you want both the error messages from a.out and the string
Segmentation fault (core dumped)
to be appended to output.txt, then you have to redirect the shell's stderr as well. E.g.,
exec 2>> output.txt && ./a.out < in 2>&1 >> output.txt &
This is because the segfault message is coming from the shell itself.
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