int main()
{
char* cmd = malloc(256*sizeof(char));
char* cmd_arg[10];
char* path = "user";
int cmdlen,i,j,tag;
if(chdir("/home/user")<0)
{
perror("chdir err");
return -1;
}
do
{
memset(cmd,0,256);
printf("-=Mini Shell %s=-$",path);
fgets(cmd,256,stdin);
cmdlen = strlen(cmd);
cmdlen--;
cmd[cmdlen] = '\0';
i=0;j=0;tag =0;
memset(cmd_arg,0,sizeof(cmd_arg));
while(i<cmdlen && j <10)
{
if(cmd[i] == ' ')
{
cmd[i] = '\0';
tag =0;
}
else
{
if(tag == 0)
cmd_arg[j++] = cmd+i;
tag =1;
}
i++;
}
if(j>=10 && i< cmdlen)
{
printf("Too Many Arguments");
continue;
}
/// quit command
if(strcmp(cmd_arg[0],"quit") == 0)
break;
if(strcmp(cmd_arg[0],"cd") == 0)
{
path = do_cd(cmd_arg);
continue;
}
// new execute
new_exec(cmd_arg);
}while(1);
}
/*
* We have started or attached to a process. Set the appropriate flags, and
* print a banner showing that we are now tracing it.
*/
static void
new_proc(struct trace_proc * proc, int follow_fork)
{
int fl;
/* Set the desired tracing options. */
fl = TO_ALTEXEC;
if (follow_fork) fl |= TO_TRACEFORK;
(void)ptrace(T_SETOPT, proc->pid, 0, fl);
/*
* When attaching to an arbitrary process, this process might be in the
* middle of an execve(). Now that we have enabled TO_ALTEXEC, we may
* now get a SIGSTOP signal next. Guard against this by marking the
* first system call as a possible execve().
*/
if ((proc->trace_flags & (TF_ATTACH | TF_STOPPING)) == TF_ATTACH)
proc->trace_flags |= TF_EXEC;
new_exec(proc);
}
