From b8e4f29db4b46614e7f21515ba439eab3c0698b1 Mon Sep 17 00:00:00 2001
From: Brahmajit Das <brahmajit.xyz@gmail.com>
Date: Tue, 13 Jun 2023 10:43:46 +0000
Subject: [PATCH 2/2] cec.c: Including select.h and time.h

According to POSIX.1-2001 sys/select.h should be included for usage of
identifier fd_set

For using structure timeval sys/time.h is needed.

Without the aforementioned includes, I'm getting the following error:
cec.c:311:3: warning: switch condition has boolean value [-Wswitch-bool]
                switch (sh == tab) {
                ^       ~~~~~~~~~
cec.c:515:2: error: use of undeclared identifier 'fd_set'
        fd_set rfds;
        ^
cec.c:521:23: error: variable has incomplete type 'struct timeval'
        struct timeval *tvp, timout;
                             ^
cec.c:521:9: note: forward declaration of 'struct timeval'
        struct timeval *tvp, timout;
               ^
cec.c:527:3: error: call to undeclared function 'FD_ZERO'; ISO C99 and later do not
      support implicit function declarations [-Wimplicit-function-declaration]
                FD_ZERO(&rfds);
                ^
cec.c:527:12: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                FD_ZERO(&rfds);
                         ^~~~
                         ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here
int ffs (int);
    ^
cec.c:528:3: error: call to undeclared function 'FD_SET'; ISO C99 and later do not
      support implicit function declarations [-Wimplicit-function-declaration]
                FD_SET(fd, &rfds);
                ^
cec.c:528:15: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                FD_SET(fd, &rfds);
                            ^~~~
                            ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here
int ffs (int);
    ^
cec.c:530:15: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                        FD_SET(0, &rfds);
                                   ^~~~
                                   ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here
int ffs (int);
    ^
cec.c:533:7: error: incomplete definition of type 'struct timeval'
                        tvp->tv_sec = 1;
                        ~~~^
cec.c:521:9: note: forward declaration of 'struct timeval'
        struct timeval *tvp, timout;
               ^
cec.c:534:7: error: incomplete definition of type 'struct timeval'
                        tvp->tv_usec = 0;
                        ~~~^
cec.c:521:9: note: forward declaration of 'struct timeval'
        struct timeval *tvp, timout;
               ^
cec.c:537:7: error: call to undeclared function 'select'; ISO C99 and later do not
      support implicit function declarations [-Wimplicit-function-declaration]
                n = select(fd+1, &rfds, nil, nil, tvp);
                    ^
cec.c:537:21: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                n = select(fd+1, &rfds, nil, nil, tvp);
                                  ^~~~
                                  ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here
int ffs (int);
    ^
cec.c:550:7: error: call to undeclared function 'FD_ISSET'; ISO C99 and later do not
      support implicit function declarations [-Wimplicit-function-declaration]
                if (FD_ISSET(0, &rfds)) {
                    ^
cec.c:550:20: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                if (FD_ISSET(0, &rfds)) {
                                 ^~~~
                                 ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here
int ffs (int);
    ^
cec.c:576:28: error: use of undeclared identifier 'rfds'; did you mean 'ffs'?
                } else if (FD_ISSET(fd, &rfds)) {
                                         ^~~~
                                         ffs
/usr/include/strings.h:25:5: note: 'ffs' declared here

Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>
--- a/cec.c
+++ b/cec.c
@@ -9,6 +9,8 @@
 #include <string.h>
 #include <signal.h>
 #include <sys/errno.h>
+#include <sys/select.h>
+#include <sys/time.h>
 #include <arpa/inet.h>
 #include <ctype.h>
 #include "cec.h"
-- 
2.41.0