C Linux programming, reading system inputs like ping or ls -l

Question

I am trying to create my own method that causes a char return with system exit.

pseudo code like this.

char *my_Out(char *in ){ in = system ("ping %s",in); return in; } 

thanks for the help.

Answer 1

You can use popen , which returns a stream from which you can read the result. By reading to the end of the file, in a line (perhaps one that dynamically grows as needed), you can implement what you ask.

Answer 2

Few things

• system() not a printf style function. You will need to use sprintf() to create your argument earlier.
• system() return value is int, not char
• As a rule, it is not recommended to rewrite function parameters.

What are you trying to do? It seems that all this function is performed by ping (which without the -c argument will never finish working with linux).

Answer 3

  Duplicate the stdout to some other file descriptor by using dup2.After the execution of the command read all the lines from the file using that file descriptor and return it.