#include 
    
     #include 
     
      unix_socket = socket(AF_UNIX, type, 0);error = socketpair(AF_UNIX, type, int *sv);#define UNIX_PATH_MAX 108struct sockaddr_un {  sa_family_t sun_family;               /* AF_UNIX  */  char        sun_path[UNIX_PATH_MAX];  /* pathname */};#include 
      
       extern char **environ;int execl(const char *path, const char *arg, ...);int execlp(const char *file, const char *arg, ...);int execle(const char *path, const char *arg, ..., char* const envp[]);int execv(const char *path, char *const argv[]);int execvp(const char *file, char *const argv[]);int execvpe(const char *file, char *const argv[], char *const envp[]);