banan-os/userspace/init/main.cpp

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#include <BAN/String.h>
#include <BAN/Optional.h>
#include <BAN/Vector.h>
#include <ctype.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void initialize_stdio()
{
char tty[L_ctermid];
ctermid(tty);
if (open(tty, O_RDONLY) != 0) _exit(1);
if (open(tty, O_WRONLY) != 1) _exit(1);
if (open(tty, O_WRONLY) != 2) _exit(1);
}
int main()
{
initialize_stdio();
if (signal(SIGINT, [](int) {}) == SIG_ERR)
perror("signal");
bool first = true;
while (true)
{
char name_buffer[128];
while (!first)
{
printf("username: ");
fflush(stdout);
size_t nread = fread(name_buffer, 1, sizeof(name_buffer) - 1, stdin);
if (nread == 0)
{
if (ferror(stdin))
{
fprintf(stderr, "Could not read from stdin\n");
return 1;
}
continue;
}
if (nread <= 1 || name_buffer[nread - 1] != '\n')
continue;
name_buffer[nread - 1] = '\0';
break;
}
if (first)
{
strcpy(name_buffer, "user");
first = false;
}
auto* pwd = getpwnam(name_buffer);
if (pwd == nullptr)
continue;
pid_t pid = fork();
if (pid == 0)
{
printf("Welcome back %s!\n", pwd->pw_name);
if (setgid(pwd->pw_gid) == -1)
perror("setgid");
if (setuid(pwd->pw_uid) == -1)
perror("setuid");
setenv("HOME", pwd->pw_dir, 1);
chdir(pwd->pw_dir);
execl(pwd->pw_shell, pwd->pw_shell, nullptr);
perror("execl");
exit(1);
}
endpwent();
if (pid == -1)
{
perror("fork");
break;
}
if (tcsetpgrp(0, pid) == -1)
perror("tcsetpgrp");
int status;
waitpid(pid, &status, 0);
if (tcsetpgrp(0, getpid()) == -1)
perror("tcsetpgrp");
}
}