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When compressing output with -z, we do so by creating a child process to
run gzip and pipe to it, and we catch SIGCHLD to clean up after the
child process. We don't want the SIGCHLD to show up as an "Interrupted
system call" error, so we specify that SIGCHLD should restart, rather
than interrupting, system calls.
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appropriately, and that GNUmakefile and the MSVC++ project file define
it apppriately, as we do with libpcap, rather than defining it in
"interface.h".
Undo the rcsid-shuffling and addition of extra #includes, as we no
longer need to arrange that "interface.h" be included before using _U_
in an RCS ID or copyright.
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use "_U_" in the definitions of "rcsid[]", to eliminate
complaints about those variables being unused;
move the definitions after the include of "interface.h", or add
an include of "interface.h", so that "_U_" is defined.
Include "config.h" before including "tcpdump-stdinc.h" in
"missing/datalinks.c".
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safer way to terminate "pcap_loop()" in a signal handler (it just sets a
flag, it doesn't muck with data structures that might have been in the
middle of being updated).
Have "setsignal()" not request SA_RESTART, so that if we call
"pcap_breakloop()" in a signal handler and then return, we don't restart
a call that was waiting for captured packets, we just make that call
EINTR out.
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