Java wrapper in C

java_launcher.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/**

C program to launch a Java Jar (eg: Minecraft server)

The purpose is to create a binary file that can be set with the SETUID permissions and owned by root.

Using this way, the server can run on the 80 port without be asked the root password.

*/
int main (int  argc,  char *argv[])
{
    //Ruta al ejecutable de Java
    char * java = "/usr/lib/jvm/java-7-openjdk-amd64/bin/java";
    printf("Ejecutable de java: %s\n", java);

    char * jar = "/opt/servidor/minecraft_server.jar";
    printf("Jar: %s\n", jar);

    chdir("/opt/servidor/");

    int pid;
    int pid_hijo;
    int status;
    pid = fork();
    switch(pid) {
        case -1:
            printf("Error al crear proceso %d\n",pid);
            exit(1);
        case 0:
            //El hijo: que llame a Java
            execlp("/usr/bin/java","/usr/bin/java","-jar","/opt/servidor/minecraft_server.jar", NULL);
            exit(2);
        default:
            //El padre
            wait(&status);
            main(argc, argv);
            break;
    }


    return 0;
}