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Full Discussion: How to clear the content of a pipe (STDIN) after it is written to another program?
Top Forums Programming How to clear the content of a pipe (STDIN) after it is written to another program? Post 302195209 by shamrock on Wednesday 14th of May 2008 02:19:40 PM
Old 05-14-2008
The process needs to read() data off the pipe in order to clear it otherwise it blocks and stays in the pipe. Invoke read() after exec'ing program B in the child process.
 

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LEARN ABOUT DEBIAN

kvkcard

KVKCARD(1)																KVKCARD(1)

NAME

       kvkcard - a commandline tool to read information from a German medical card

SYNOPSIS

       kvkcard read | daemon | rdvd | rdpd [ [ -v | --verbous ] [ -fFILE | --filename=FILE ] [ -cCARDID | --cardid=CARDID ] [ -b | --beep ] [ -d |
       --dosmode ] [ -pPROGRAM | --program=PROGRAM ] [ -aARGUMENTS | --args=ARGUMENTS ] [ -h | --help ] ]

DESCRIPTION

       kvkcard is a commandline tool to read information from a German medical card (KVK or eGK).

ARGUMENTS

       read   Read data from a German medical card.

       daemon Wait for insertion of a German medical card and run a program on it.

       rdvd   Dump RDVD data structure of a card.

       rdpd   Dump RDPD data structure of a card.

       -v | --verbous
	      Every occurrence of this option increases the verbosity.

       -f FILE | --filename=FILE
	      File to write to. If omitted stdout will be used.

       -c CARDID | --cardid=CARDID
	      Set the ID of the card to read.

       -b | --beep
	      Beep after reading a card.

       -d | --dosmode
	      Output data in DOS mode.

       -p PROGRAM | --program=PROGRAM
	      Program to call on cards found.

       -a ARGUMENTS | --args=ARGUMENTS
	      Arguments for the program to be called

       -h | --help
	      Shows this help.

FILES

       /etc/chipcard/
	      The system-wide configuration files.

       /var/log/chipcard/
	      The default log files.

SEE ALSO

       http://www.libchipcard.de
	      Homepage of libchipcard project.

       /usr/share/doc/libchipcard-tools/
	      Local documentation.

REVISION

Manual for kvkcard						  2009 March 19th							KVKCARD(1)
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