int main(int argc,char* argv[])
{
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
signal(SIGQUIT, sig_handler);
signal(SIGTSTP, sig_handler);
int isExit = 0;
do {
char rawInput[255];
isExit = getUserInput(rawInput);
if(isExit == 1) break;
if (isExit == 0)
tokenizeInput(rawInput);
} while(isExit = 1);
return 0;
}
int main(int argc, char** argv) {
pid_t pid;
glob_t globbuf;
while (1) {
printf("$");
char buf[MAX_LINE];
char **argvv = tokenizeInput(buf);
if (strcmp(argvv[0], "exit") == 0) {
kill(pid, SIGKILL);
exit(1);
}
pid = fork();
if (pid < 0) {
fprintf(stderr, "Fork failed");
exit(1);
}
else if (pid == 0) { // child
// backup stdout, stdin
int stdin_save, stdout_save;
// exec, redirecting streams as necessary
if (is_redirect_in) {
stdin_save = dup(STDIN_FILENO);
freopen(redirect_stream, "r", stdin);
execvp(argvv[0], argvv);
dup2(stdin_save, STDIN_FILENO);
exit(1);
}
else if (is_redirect_out) {
stdout_save = dup(STDOUT_FILENO);
freopen(redirect_stream, "w", stdout);
execvp(argvv[0], argvv);
dup2(stdout_save, STDOUT_FILENO);
exit(1);
}
else if (has_wildcard) {
// usage as detailed in `man glob`
globbuf.gl_offs = argv_count - 1;
// the GLOB_DOOFFS allocates gl_offs for us to merge
glob(wildcard_expr, GLOB_DOOFFS, NULL, &globbuf);
// merge the existing argvv array
int i;
for (i = 0; i < argv_count - 1; ++i) {
globbuf.gl_pathv[i] = argvv[i];
}
execvp(argvv[0], globbuf.gl_pathv);
exit(1);
}
else {
execvp(argvv[0], argvv);
exit(1);
}
}
else { // parent
if (is_fg) {
wait(NULL);
}
}
}
return 0;
}
