static int umount_and_exec(char **argv) {
char *mountpoint = argv[0];
char *cmd = argv[1];
if (unshare(CLONE_NEWNS) == -1) {
if(!(flags&QUIET))
fprintf(stderr, "Cannot unshare(CLONE_NEWNS): %s (errno: %i)\n", strerror(errno), errno);
return errno;
}
if(mountpoint == NULL)
return EINVAL;
if(umount2(mountpoint, MNT_DETACH)) {
if(!(flags&QUIET))
fprintf(stderr, "Cannot umount2(\"%s\", MNT_DETACH) in the new namespace: %s (errno: %i)\n", mountpoint, strerror(errno), errno);
return errno;
}
if(cmd == NULL) {
char *argv_exec[2] = { NULL };
cmd = getenv("SHELL");
argv_exec[1] = cmd;
return my_execvp(cmd, argv_exec);
}
char **argv_exec = &argv[1];
return my_execvp(cmd, argv_exec);
}
/*pre: takes in int argc and char **argv
*post: runs the minishell program
* with argc number of command line arguments defined by argv
*/
int main(int argc, char **argv)
{
int n;
int pid;
char *s;
char **v;
s = (char*)xmalloc(256*sizeof(char));
while(1)
{
my_str("minishell> ");
n = read(0, s, 256);
#ifdef DEBUG
my_str("n= ");
my_int(n);
my_char('\n');
#endif
s[n - 1] = '\0';
if(n > 1)/*1 character is just a \0 (read in \n user just hit enter)*/
{
v = my_str2vect(s);
if(my_strcmp(v[0], "cd") == 0)
my_chdir(v[1]);
else if(my_strcmp(v[0], "exit") == 0)
break;
else if(v[0] != NULL)/*if not just whitespace, we're going to need to fork*/
{
#ifdef DEBUG
my_str("command:>");
my_str(v[0]);
my_str("<\n");
my_str("going to fork\n");
#endif
if((pid = fork()) < 0)
my_err("minishell: ERROR forking process!\n");
else if(pid > 0)
wait(NULL);
else
{
my_execvp(v[0], v);
#ifdef DEBUG
my_str("exiting forked process\n");
#endif
exit(0);/*for processes that end in error*/
}
}
#ifdef DEBUG
my_str("freeing vector\n");
#endif
my_freevect(v);
}
else if(n < 0)
my_str("minishell: ERROR reading command\n");
}
free(s);
my_str("Thank you for using myminishell, live long and prosper.\n");
return 0;
}