int spawnl(int mode, char *fname, char *arg0, ..., char *argN, NULL)
int spawnle(int mode, char *fname, char *arg0, ..., char *argN, NULL, char *envp[ ])
int spawnlp(int mode, char *fname, char *arg0, ..., char *argN, NULL)
int spawnlpe(int mode, char *fname, char *arg0, ..., char *argN, NULL, char *envp[ ])
int spawnv(int mode, char *fname, char *arg[ ])
int spawnve(int mode, char *fname, char *arg[ ], char *envp[ ])
int spawnvp(int mode, char *fname, char *arg[ ])
int spawnvpe(int mode, char *fname, char *arg[ ], char *envp[ ])