Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
"Your a7.c program should use printf to print a nice message. (You can decide what to say.) Then the process should use the fork system call to create a child process. Then, your code should do different things depending on whether the process is the parent or the child:
The parent should print one more message (using printf) saying that it is the parent, what its PID is, and what its child's PID is. It should then contain the command sleep(4).
The child process should use the excel system call to load and run your a7.sh script.
The a7.sh script is the first half of the homework that I have already completed and it simply is a script that contains a function that uses three different parameters that are integers, such as 17 5 and 23. There are multiple conditions that I had to be met and if the parameters met any of these conditions, it would return a certain exit status that I set myself, such as return 0, return 1, return 2, etc..
I bolded the last past because that is where I'm stuck on. I cannot figure out how to use the execl system call to load and run my a7.sh script.
2. Relevant commands, code, scripts, algorithms:
Everything is being in a bash shell.
This is a7.sh: 3. The attempts at a solution (include all code and scripts):
Now here's the code I have for a7.c, the second half of the assignment.
I bolded the part that is not giving me any results. I compiled a7.c in the file directory using (cc -o a7.out a7.c) and ran a7.out. It gives me output for the PARENT process, and it gives me the correct output for it. However, after it sleeps, nothing happens in the CHILD process. It just ends. It does not run my a7.sh script at all. I made sure that it was even making it that far through the program by printing a statement below the execl system call, and it does make it that far. I am not getting any errors or anything, but it's obviously not running my a7.sh script. I just can't understand how execl works and what exactly needs to be put in the ( ) to run whatever I want to run. The only example done in class by the professor was calling the ps command which is a command and not a script.
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Western Illinois University, Macomb, IL, USA, MCQUILLAN, CS371
Any help would be great. This is my final assignment of the semester and I've done great up until this part. I think my problem should be pretty simple to solve. I've spent a lot of time on this assignment and this is the last problem that needs to be fixed. Thanks in advance!
Last edited by Perderabo; 04-22-2014 at 12:23 AM..
Hi,
Ho do I differentiate system call from library call?
for example if I am using chmod , how do I find out if it is a system call or library call?
Thanks
Muru (2 Replies)
Hi,
I am calling a program that greps and returns 72536 bytes of data on STDOUT, say about 7000 lines of data on STDOUT.
I use pipe from the program am calling the above program. Naturally, I execute the above program (through execl() ) throught the child process and try to read the... (4 Replies)
Hi,
I would like to know how to call a program "cmp_size" ... where to put in progam to run it
ex: program checkdisk is below, and it will call a nother problem "cmp_size"
Do I just put the cmp_size program at the end of this program.
Thank you very much,
# check all directory for size... (3 Replies)
Dear all,
Currently I'm working on a C program (OS = ubuntu 9.0.4)in which a USB key will
be mounted and umounted for several times. I read the man page
of the mount system call.
I use the following test code
#include <sys/mount.h>
int main(int argc, char *argv)
{
if... (5 Replies)
I need to write a c program that uses the fork and excel system calls to run the shell script mode invoked like this: "./mode 644 ls -l" (that is the argumetns will always be 644 ls -l)
here's the mode script:
#!/bin/sh
octal="$1"
shift
find . -maxdepth 1 -perm $octal -exec $@ {} \;
... (3 Replies)
Hello everyone!
I'm quite new here, but this forum helped me a lot before without registering :-)
I'll go directly to my problem, I have been searching a bit about this issue but I was not successful.
I need to write a program in C code to notificate me (to my email) when some action is done... (7 Replies)
Write a program using select, which will create some number of child processes that continuously send text messages to the parent process using pipes. Each child has its own pipe that it uses to communicate with the parent. The parent uses select () to decide what pipes should be processed to... (1 Reply)
main()
{
printf("before execl");
execl("/home/nirmala/os/fact","fact");
printf("this line will not be printed");
}
for the above program ,the obj file of fact.c is getting loaded correctly.am getting the output as...
factorial =6
but in ouput am not getting the string given in... (2 Replies)