How to execute an application2 from another application1 without freezing application1?

Question

With the help of the function int system (const char* command); I can execute an application from another application. The stdlib.h contains the function system. For example:

click button1 in application1 -> open application2.

The Button1 clicked event executes the function

system(application2.app);

But when application2 is executed application1 freezes until application2 will be closed. Is it possible to execute application2 without blocking application1?

You might like to look for "*`fork()` followed by `exec*()`*" examples. — alk, Dec 19 '14 at 14:26

score 2 · Accepted Answer · answered Dec 19 '14 at 14:28

2

Use fork

pid_t pid;

pid = fork();
if (pid == 0)
{
    /* this is the new process, execute the other application here */
    system("your application file path");
    _exit(0);
 }
 /* Here you continue in application1

And I would recomment to take a look at the execve and family functions, instead of system.

answered Dec 19 '14 at 14:28

Iharob Al Asimi

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Using `system()` is highly incompatible, as one never knows which kind of shell is started. The preferred way is to use a member of the `exec*()`-family of functions. Also please read here: http://stackoverflow.com/q/14830611/694576 – alk Dec 19 '14 at 14:30
@alk Yes, i recommended that. – Iharob Al Asimi Dec 19 '14 at 14:33
You should update your answer. You mention execve (the exec* family of functions is the correct way to go), but your answer, in code, still uses system() – Don Shankin Dec 19 '14 at 15:18
This works fine and dandy on Linux, no love for Windows though (unless you're using Cygwin...) – sdzivanovich Dec 19 '14 at 15:18
There is a `osx` tag in the post. – Iharob Al Asimi Dec 19 '14 at 15:20

How to execute an application2 from another application1 without freezing application1?

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