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wrapsink minnow


wrapsink "program" 


wrapsink "myexe"
wrapsource "myexe -n 3 -o outfile < in.script"
wrapsink "ls *" 


Wrapsink is a PHISH minnow that can be used in a PHISH program. In PHISH lingo, a "minnow" is a stand-alone application which makes calls to the PHISH library to exchange data with other PHISH minnows.

The wrapsink minnow is used to wrap a non-PHISH application so that datums can be sent to it from other PHISH minnows as lines it reads from stdin. It is a mechanism for using non-PHISH applications as minnows in a PHISH net.


The wrapsink minnow uses one input port 0 and no output ports.


When the wrapsink minnow starts, the program argument is treated as a string that is executed as a command by the shell. As in the examples above program can be an executable program name or a shell command. It can include flags or redirection operators. If the string contains spaces, it should be enclosed in quotes in the PHISH input script so that it is treated as a single argument when the script is read by the tool.

After the wrapsink minnow launches the program command, it calls the phish_loop function. Each time an input datum is received, its single string field is written to the running program with a trailing newline, so that the program reads it as a line of input from stdin. The program may write to the screen or a file as often as it chooses, but its output is not captured by the wrapsink minnow.

The wrapsource minnow shuts down when its input port is closed by receiving a sufficient number of "done" messages. When this occurs, it closes the stdin pipe the running program is reading from, which should cause it to exit.


The wrapsink minnow must receive single field datums of type PHISH_STRING.


The C++ version of the wrapsink minnow allocates a buffer of size MAXLINE = 1024 bytes for converting the PHISH_STRING fields of received datums into lines of input read from stdin by the wrapped program. This can be changed (by editing minnow/wrapsink.cpp) if longer lines are needed.

Related minnows:

wrapsource, wrapss