tcpsvd: new applet

It's a GPL-ed 'clone' of Dan Bernstein's tcpserver.
Author: Gerrit Pape <pape@smarden.org>
http://smarden.sunsite.dk/ipsvd/
size tcpsvd.o
   text    data     bss     dec     hex filename
   2571       4      16    2591     a1f tcpsvd.o

include/applets.h

@@ -293,6 +293,7 @@ USE_SYSLOGD(APPLET(syslogd, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_TAIL(APPLET(tail, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TAR(APPLET(tar, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_TASKSET(APPLET(taskset, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_TCPSVD(APPLET(tcpsvd, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TEE(APPLET(tee, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TELNET(APPLET(telnet, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_TELNETD(APPLET(telnetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))

include/libbb.h

@@ -266,6 +266,7 @@ char *xrealloc_getcwd_or_warn(char *cwd);
 char *xmalloc_readlink_or_warn(const char *path);
 char *xmalloc_realpath(const char *path);
 extern void xstat(const char *filename, struct stat *buf);
+
 /* Unlike waitpid, waits ONLY for one process,
  * It's safe to pass negative 'pids' from failed [v]fork -
  * wait4pid will return -1 and ECHILD in errno.
@@ -274,6 +275,24 @@ extern void xstat(const char *filename, struct stat *buf);
  *      if (rc > 0) bb_error_msg("exit code: %d", rc);
  */
 extern int wait4pid(int pid);
+extern int wait_pid(int *wstat, int pid);
+extern int wait_nohang(int *wstat);
+//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);
+
+#define wait_crashed(w) ((w) & 127)
+#define wait_exitcode(w) ((w) >> 8)
+#define wait_stopsig(w) ((w) >> 8)
+#define wait_stopped(w) (((w) & 127) == 127)
+
+
+
 extern void xsetgid(gid_t gid);
 extern void xsetuid(uid_t uid);
 extern void xchdir(const char *path);
@@ -340,7 +359,7 @@ len_and_sockaddr* xhost_and_af2sockaddr(const char *host, int port, sa_family_t
  * NB: does NOT do htons() internally, just direct assignment. */
 void set_nport(len_and_sockaddr *lsa, unsigned port);
 /* Retrieve sin[6]_port or return -1 for non-INET[6] lsa's */
-int get_nport(const len_and_sockaddr *lsa);
+int get_nport(const struct sockaddr *sa);
 /* Reverse DNS. Returns NULL on failure. */
 char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen);
 /* This one doesn't append :PORTNUM */

include/usage.h

@@ -3325,6 +3325,11 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "$ echo $?\n" \
        "1\n"
 
+#define tcpsvd_trivial_usage \
+       "TODO"
+#define tcpsvd_full_usage \
+       "TODO"
+
 #define tftp_trivial_usage \
        "[OPTION]... HOST [PORT]"
 #define tftp_full_usage \