hello
I trying to run a program called bb with this Linux shell code and its looking in this directories:
trying to run bb in /usr/lib/lightdm/lightdm
trying to run bb in /usr/local/sbin
trying to run bb in /usr/local/bin
trying to run bb in /usr/sbin
trying to run bb in /usr/bin
trying to run bb in /sbin
trying to run bb in /bin
trying to run bb in /usr/games
trying to run bb in /usr/local/games
and there is no results
any ideas?
why its not looking in all directories of the system?
Holon Institute of Technology/ B.Sc Computer Science / Operation Systems Course with Dr.Wiseman
I trying to run a program called bb with this Linux shell code and its looking in this directories:
trying to run bb in /usr/lib/lightdm/lightdm
trying to run bb in /usr/local/sbin
trying to run bb in /usr/local/bin
trying to run bb in /usr/sbin
trying to run bb in /usr/bin
trying to run bb in /sbin
trying to run bb in /bin
trying to run bb in /usr/games
trying to run bb in /usr/local/games
and there is no results
any ideas?
why its not looking in all directories of the system?
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
char *sh="Shell>";
int i,pathindex=0, ret;
char line[80]; // getting the user prompt
char *paths[20]={"NULL"}; // 20 values path array
char *currentpath, *path; // current path to execute in
char *arg[]={NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL} ;
//////////////////////////////////////////////////////////////////////////////
path=getenv("PATH");
currentpath=strtok(path,":");
while (currentpath!=NULL)
{
paths[pathindex]=currentpath; // filling the paths array
currentpath=strtok(NULL,":"); // from enviroment variable
pathindex++; // PATH.
}
system("/usr/bin/clear");
printf("\n\nShell Program (OS Course)\n");
printf("-------------------------\n\n");
while (1)
{
printf("%s",sh);
gets(line);
arg[0]=strtok(line," "); // getting command
if (strcmp(line,"leave")==0) exit(0);
for (i=1;i<10;i++) arg[i]=strtok(NULL," "); //getting command arguments
pathindex=0;
while (paths[pathindex]!=NULL)
{
if ((pid=fork())<0)
{
printf("Error: Couldn't fork\n");
exit(1);
}
if (pid==0)
{
printf("trying to run %s in %s\n",arg[0],paths[pathindex]);
ret=execv(paths[pathindex],arg);
if (ret==-1) exit(1);
}
else { wait(); pathindex++; }
}
}
return 0;
}Holon Institute of Technology/ B.Sc Computer Science / Operation Systems Course with Dr.Wiseman