FreeCalypso > hg > freecalypso-tools
view rvinterf/l1filter/init.c @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | ea458ee48691 |
children |
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/* * This module implements some init for l1trace-filter. */ #include <sys/types.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "pktmux.h" #include "localsock.h" extern int sock; send_init_command(cmdpkt, cmdlen) u_char *cmdpkt; { u_char lenbuf[2]; lenbuf[0] = 0; lenbuf[1] = cmdlen; write(sock, lenbuf, 2); write(sock, cmdpkt, cmdlen); } init() { static u_char want_l1_mux[2] = {CLI2RVI_WANT_MUXPROTO, RVT_L1_HEADER}; localsock_prep_for_length_rx(); send_init_command(want_l1_mux, 2); }