Show Bid Request
C programming
Bid Request Id: 48595
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Posted by: |
tamireac (1 ratings)
(Software buyer rating 10 )
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Non-action Ratio: |
Above Average - 40.00%
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Buyer Security Verifications: |
Good
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Approved on: |
Feb 17, 2003
9:40:51 AM EDT
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Bidding Closes: |
Feb 19, 2003 EDT
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Viewed (by coders): |
77 times
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Deadline: |
2/19/2003
TIME EXPIRED
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Description:
Introduction: The exec system call overlays a new program into a process. The fork and exec combination is used very frequently in UNIX to spawn a new process and to overlay a new program. A common example is trying a shell command at a shell prompt. The shell forks a new process which starts with a shell image, then makes an exec call to overlay the shell image the shell command.
Complete the following skeleton C program for spawning a process and starting a new program.
/*This program reads a command line from the terminal and executes it*/
#include<stdio.h>
/*declare functionm protocols here*/
/*the main fuction is given as follows
main()
{
char*line [132];
char*command;
char**argv;
int pid;
while(1) {
if(gets(line)==0)exit(0);
if(strlen(line)==0)continue;
parse_command(line, command, &argv);
pid = start_command(command, argv);
if(pid>0)wait(0);
}
}
/*Your job is to complete two functions: parse_command, start_command, and child*/
/*1. write a function to parse command*/
void parse_command (char[] line,char*command, char**argv)
{
}
/*2. complete the start_command function*/
int start_command(char*command, char**argv)
{
int pid; /*return value of fork call
//Create child process
.......
if(pid==0){
/* invoke the child function here*/
}
else if (pid<0){
/*print out fork error message*/
}
return pid;
}
/*3. Complete child function*/
void child(char*command, char**argv){
int status;
/*status will store the return value of an execvp system call*/
/*EXEC new command in child process by invoking execvp system call*/
......
/*If exec was successful, this code will not be executed.*/
if(status<0){
/*print error message: a wrong command*/
}
exit(0);
}
Deliverables:
1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.
2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bi request.
3) Complete ownership and distribution copyrights to all work purchased.
Platform:
C programming only
Must be 100% finished and received by buyer on:
Feb 19, 2003 EDT
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Bidding/Comments:
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