Description
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.
