exec.Command couldn't C executables , throwing exit status errors

[domitian]

hi,
I executing a C executable using exec.Command and exec.Start(). My C executable is in the current directory and this is my code

cmd := exec.Command("./a.out")
// stdout,err := cmd.StderrPipe()
stderr,_ := cmd.StderrPipe()

err := cmd.Start()
if err != nil {
    log.Fatal(err)
}

log.Printf("Waiting for command to finish...")
s,err := ioutil.ReadAll(stderr)
log.Printf(string(s))
err = cmd.Wait()
log.Printf("Command finished with error: %v", err)

When i run this code, this is the output i get

2014/12/10 07:49:39 Waiting for command to finish...
2014/12/10 07:49:39 Command finished with error: exit status 11

My C hello world program is simple

 #include <stdio.h>
int main(){
printf("hello world");
}

The C code is compiled with gcc version 4.8.2 and executable is a.out.

The C executable a.out is a simple hello world program, i am getting the correct output, but i can't understand why exec.Wait() is exiting with status code 11 and not with 0.

The executable('a.out') is running normally when i run on a linux terminal without any faults or errors

[rsc]

This isn't a Go problem.

Your C program does not contain a return statement. If you build it with 'gcc -Werror' it should tell you this, I would think. In any case, because there is no return statement, main returns whatever is in register AX when it ends. That turns out to be the return value from printf, the length of "hello world", 11.

When you run the program on a Linux terminal you are getting exactly the same behavior, but you are ignoring it. Try:

$ ./a.out
$ echo $?

and it will say 11.

[domitian]

thank you very much, i wasted a whole day on this issue.