monitor: include unistd.h in main.c
This fixes a build break on some systems, specifically the raspberry Pi 3 (ARM): monitor/main.c: In function ‘open_packet’: monitor/main.c:176:3: error: implicit declaration of function ‘close’; did you mean ‘pclose’? [-Werror=implicit-function-declaration] 176 | close(fd); | ^~~~~ | pclose
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@ -32,6 +32,7 @@
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#include <string.h>
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#include <getopt.h>
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#include <signal.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <linux/genetlink.h>
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