98 lines
3.8 KiB
Plaintext
98 lines
3.8 KiB
Plaintext
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Q: What is the clue of socat?
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A: socat probably doesn't have any clue. It is more an attempt to smoothly
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integrate similar I/O features that are usually handled differently under
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UNIX.
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Q: What does the prefix XIO mean?
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A: XIO means "extended input/output". It is a library/API that provides a
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common way for handling files, sockets and other forms of I/O. Its advantage is
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that the application may reduce its I/O to open / read+write / close calls,
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while the user controls all I/O details (and even basic process properties) by
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packing options into the filename string. This is the basic part of socat.
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Q: Is there a Windows port of socat available?
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A: Try with Cygwin from http://www.cygwin.com/, or upgrade to Linux.
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Q: I succeeded to configure and make socat, but ./test.sh says something
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like:
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./test.sh: No such file or directory
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A: You need a bash shell, and its location must be correctly specified in the
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first line of test.sh, e.g. /usr/local/bin/bash instead of /bin/bash.
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Q: configure disables readline / openssl / libwrap support because it does not
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find an include file / the library. How can I tell configure where these files
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are?
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A: For include locations, use the environment variable CPPFLAGS, for library
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locations use LIBS, e.g.:
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export CPPFLAGS="-I/home/user/ssl/include"
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export LIBS="-L/home/user/ssl/lib"
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On some systems (SunOS), you might also need to set LD_LIBRARY_PATH:
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export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/user/ssl/lib"
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Then try again:
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make distclean; ./configure; make
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Q: I succeeded to make socat, but the test.sh script fails for many tests.
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Is my socat build corrupt?
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A: Probably your socat program is ok; the tests have been developed on Linux
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2.4, and there they usually succeed.
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But the following OS differences result in errors on non Linux systems:
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* Linux allows to bind a socket to any address of range 127.0.0.0/8, not
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only 127.0.0.1. Some tests are built on this feature, but they might fail on
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other systems.
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* Your OS might have no IP6 implementation
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* MacOS X has some difficulties, e.g. distinguishing sockets and pipes.
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* the OpenSSL tests require OpenSSL support by socat, must have openssl in
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$PATH, and "openssl s_server ..." needs enough entropy to generate a key.
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Q: When I specify a dual address (two partial addresses linked with "!!") on
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the command line, I get some message "event not found", and my shell history
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has the line truncated. Not even protecting the '!'s with '\' helps.
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A: '!' is appearently used by your shell as history expansion character. Say
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"set +H" and add this line to your (bash) profile.
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Q: On Solaris, socat was built successfully, but when started, it gets killed
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with something like "ld.so.1: ./socat: fatal: libreadline.so.4: open failed: no
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such file or directory"
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A: The configure script finds your libreadline, but the runtime loader
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doesn't. Add the directory where the library resides to your LD_LIBRARY_PATH
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variable, e.g.:
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LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/sfw/lib/
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make distclean; ./configure; make
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Q: On Solaris, socat was built successfully, but when started, an assertion
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fails: "xioinitialize.c:25: failed assertion `3 << opt_crdly.arg3 == CRDLY'
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A: Probably, in a second attempt you set the correct LD_LIBARY_PATH for socat,
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but it had not been set during the ./configure run, or you did not "make clean"
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before running configure. Try it again:
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make distclean; ./configure; make
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Q: A socat process, run in background from an interactive shell, is always
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stopped with all its child processes after about 5 minutes. killall -9 socat is
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required to clean the system and allow socat to be started again.
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A: The terminal (window) might have the TOSTOP flag set and one of the socat
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processes wants to write to the terminal. Clear this flag in your shell:
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stty -tostop
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and start socat again.
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Thanks to Philippe Teuwen for reporting this situation.
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