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C++ How to use pipe() & fork() with stdin and stdout to another program
Post 302178133 by vvaidyan on Monday 24th of March 2008 06:51:43 PM
03-24-2008
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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
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-> 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:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:
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diff3
DIFF3(1) User Commands DIFF3(1) NAME
diff3 - compare three files line by line SYNOPSIS
diff3 [OPTION]... MYFILE OLDFILE YOURFILE DESCRIPTION
Compare three files line by line. -e --ed Output unmerged changes from OLDFILE to YOURFILE into MYFILE. -E --show-overlap Output unmerged changes, bracketing conflicts. -A --show-all Output all changes, bracketing conflicts. -x --overlap-only Output overlapping changes. -X Output overlapping changes, bracketing them. -3 --easy-only Output unmerged nonoverlapping changes. -m --merge Output merged file instead of ed script (default -A). -L LABEL --label=LABEL Use LABEL instead of file name. -i Append `w' and `q' commands to ed scripts. -a --text Treat all files as text. --strip-trailing-cr Strip trailing carriage return on input. -T --initial-tab Make tabs line up by prepending a tab. --diff-program=PROGRAM Use PROGRAM to compare files. -v --version Output version info. --help Output this help. If a FILE is `-', read standard input. Exit status is 0 if successful, 1 if conflicts, 2 if trouble. AUTHOR
Written by Randy Smith. REPORTING BUGS
Report bugs to <bug-gnu-utils@gnu.org>. COPYRIGHT
Copyright (C) 2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for diff3 is maintained as a Texinfo manual. If the info and diff3 programs are properly installed at your site, the command info diff should give you access to the complete manual. diffutils 2.8.7-cvs January 2008 DIFF3(1)