-extern void xstat(char *filename, struct stat *buf);
-extern pid_t spawn(char **argv);
-extern pid_t xspawn(char **argv);
-extern int wait4pid(int pid);
-extern void xsetgid(gid_t gid);
-extern void xsetuid(uid_t uid);
-extern void xdaemon(int nochdir, int noclose);
-/* More clever/thorough xdaemon */
-extern void bb_sanitize_server_stdio(int daemonize);
-extern void xchdir(const char *path);
-extern void xsetenv(const char *key, const char *value);
-extern int xopen(const char *pathname, int flags);
-extern int xopen3(const char *pathname, int flags, int mode);
-extern off_t xlseek(int fd, off_t offset, int whence);
-extern off_t fdlength(int fd);
-
-
-extern int xsocket(int domain, int type, int protocol);
-extern void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);
-extern void xlisten(int s, int backlog);
-extern void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen);
-extern int xconnect_tcp_v4(struct sockaddr_in *s_addr);
-extern struct hostent *xgethostbyname(const char *name);
-extern struct hostent *xgethostbyname2(const char *name, int af);
-extern int setsockopt_reuseaddr(int fd);
-extern int setsockopt_broadcast(int fd);
-
-/* "new" (ipv4+ipv6) API */
+
+
+//TODO: signal(sid, f) is the same? then why?
+extern void sig_catch(int,void (*)(int));
+//#define sig_ignore(s) (sig_catch((s), SIG_IGN))
+//#define sig_uncatch(s) (sig_catch((s), SIG_DFL))
+extern void sig_block(int);
+extern void sig_unblock(int);
+/* UNUSED: extern void sig_blocknone(void); */
+extern void sig_pause(void);
+
+
+void xsetgid(gid_t gid);
+void xsetuid(uid_t uid);
+void xchdir(const char *path);
+void xsetenv(const char *key, const char *value);
+void xunlink(const char *pathname);
+void xstat(const char *pathname, struct stat *buf);
+int xopen(const char *pathname, int flags);
+int xopen3(const char *pathname, int flags, int mode);
+int open_or_warn(const char *pathname, int flags);
+int open3_or_warn(const char *pathname, int flags, int mode);
+off_t xlseek(int fd, off_t offset, int whence);
+off_t fdlength(int fd);
+
+
+int xsocket(int domain, int type, int protocol);
+void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);
+void xlisten(int s, int backlog);
+void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen);
+ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
+ socklen_t tolen);
+int setsockopt_reuseaddr(int fd);
+int setsockopt_broadcast(int fd);
+/* NB: returns port in host byte order */
+unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port);