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How to write to stdin of another program (program A -> [stdin]program B)
Post 302190791 by vvaidyan on Wednesday 30th of April 2008 01:34:55 PM
04-30-2008
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PROGRAM A <-> PROGRAM B
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Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
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Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
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-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
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-> char line;
-> read(fd, line, 100);
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LEARN ABOUT DEBIAN
dpipe
DPIPE(1) General Commands Manual DPIPE(1) NAME
dpipe - bi-directional pipe command SYNOPSIS
dpipe [ command [ args ] ] = [ command [ args ] ] dpipe [ command [ args ] ] = [ command [ args ] ] [ = [ command [ args ] ] ] ... DESCRIPTION
dpipe is a general tool to run two commands diverting the standard output of the first command into the standard input of the second and vice-versa. It is the bi-directional extension of the | (pipe) syntax used by all the shells. The = has been chosen as a metaphor of two parallel communication lines between the commands. It is also possible to concatenate several tools. Intermediate programs communicate using standard input and standard output with the preceding tool and alternate standard input and output (respectively file descriptors number 3 and 4) towards the following tool. If an intermediate tool should process only the data flowing in one direction use { or } as suffix for the preceding = and prefix of the following one. This tool has been written as a tool for the Virtual Distributed Ethernet. EXAMPLE
dpipe a = b processes a and b are bidirectionally connected: stdin of a is connected to stdout of b and vice-versa dpipe a = b = c a and b are connected as above. Alternate stdin of b is connected to stdout of c and alternate stdout of b to stdin of c dpipe a =} b }= c This is a cycle of pipes: stdout of a is connected to stdin of b, stdout of b with stdin of c, and stdout of c to stdin of a dpipe a =} b }={ c {= d = e all the notations can be mixed together. this is a -> b -> d -> c and back to a; alternate ports of d are connected to e OPTIONS
no options. NOTICE
Virtual Distributed Ethernet is not related in any way with www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik" i.e. the German "Association for Electrical, Electronic & Information Technologies"). SEE ALSO
vde_switch(1), vde_plug(1), vde_plug2tap(1), vdeq(1). wirefilter(1). AUTHOR
VDE is a project by Renzo Davoli <renzo@cs.unibo.it>. Virtual Distributed Ethernet December 6, 2006 DPIPE(1)