1 int spawnvppe_pipe(const char *cmd
, const char **argv
, const char **env
, char **path
, int pin
[], int pout
[]);
2 int spawnvpe_pipe(const char *cmd
, const char **argv
, const char **env
, int pin
[], int pout
[]);
3 const char **copy_environ();
4 const char **copy_env(const char **env
);
5 void env_unsetenv(const char **env
, const char *name
);