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strcat Segmentation fault (core dumped), C++

I have a segment of code in C++, when I run exec it give me an "Segmentation fault (core dumped)". Can someone help me to fix the problem.

char* str1;
str1 = (char*) malloc (3);
str1 = "abc";

char* str2;
str2 = (char*) malloc (3);
str2 = "def";

strcat(str1, str2);

It gives me run time error "segmentation fault"

ASKER CERTIFIED SOLUTION

AlexFM

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david_2005

ASKER

Thank you for your help.

I have other question

when I do system("echo nutsh | ls") where 'nutsh' is my executable file, it will output the 'ls' result for me on the screen. I want to know is it actually exec the 'nutsh' file or it just exec the 'ls' form "/bin/ls"

lbertacco

it sends the string "nutsh" to ls. However "ls" ignores what it's getting from input and just lists the directory.
In other words, you are executing /bin/echo and /bin/ls but not nutsh.
Probably this is not what you intended. What is your aim?

david_2005

ASKER

I want to execute an external executable file (nutsh),

here is how my code and exec file links:

http://www.cox-internet.com/nguyen/work.cpp

http://www.cox-internet.com/nguyen/nutsh

Please tell me what have I done wrong, and how can I fix it

Thank you in advance

lbertacco

First of all , remove the "echo" from sysem as in system("./tmp/netsh |...")

david_2005

ASKER

I just wonder we may have to use execl() to fix the probem

SOLUTION

lbertacco

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david_2005

ASKER

Thank you for your help.
I got this problem solve by myself already.

lbertacco

Well, you should give points anyway since we answered your question and told you where the problem with your code was.