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Project 4 Solution

turnin code: cs_p4




Write a program that forks one process. Have the new process execve the

program named /usr/bin/sort. Use dup/dup2 and a pipe to establish a way

for the original process to pass stdin to sort. The sort program will

simply print to stdout.




BE SURE TO HAVE THIS AS THE FIRST EXECUTABLE LINE IN *BOTH* PROCESSES:




alarm(60)




The original process should read lines of input from a file named as the

first command-line arg. Discard any lines that contain the word foobar

in lower-case. All other lines should be passed to sort via the pipe.




Command-line args after the filename should be handed to sort as if they

were entered on its command-line; there will not be more than 3.




I will run tests by typing commands like this:




./p4 infilename1

./p4 infilename2 -n # -n will be passed as arg to sort

./p4 infilename2 -n -r # -n and -r will be passed as args to sort







As in prior projects, if the program is run with a single command-line arg

of -hw then it should simply print hello world and then exit(0)







TURNIN info:

You should submit a tar file of a directory which contains all of the

required files (makefile, C source files, header files, etc).

Sample tar command to create a tar file from a dir named p4dir:

tar cvf p4.tar ./p4dir ## do *NOT* use full pathname of the dir

After un-tarring your project, I will cd to the dir containing

it and type:

rm -rf p4

rm -f *.o

make

It should build an executable named p4 as described above.

Sample un-tar, build, and simple execution will be provided in the script

p4testfiles/PREP.py which must execute correctly to be graded further.

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