reboot4 binary for setting up ios 4 powdersn0w

reboot4.c

// clang -isysroot iPhoneOS5.1.sdk -arch armv7 reboot4.c -o reboot4

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <spawn.h>

extern char **environ;

/**
 * Spawns a process and waits for it to complete.
 * Returns the process exit status, or -1 on error.
 */
int easy_spawn(const char *path, char *const argv[]) {
    pid_t pid;
    int status;

    // Spawn child process
    int res = posix_spawn(&pid, path, NULL, NULL, argv, environ);
    if (res != 0) {
        perror("posix_spawn failed");
        return -1;
    }

    // Wait for completion
    if (waitpid(pid, &status, 0) == -1) {
        perror("waitpid failed");
        return -1;
    }

    return status;
}

int main(void) {

    printf("1. Initial file system checks\n");
    easy_spawn("/sbin/fsck_hfs", (char *[]){"/sbin/fsck_hfs", "-f", "/dev/disk0s1", NULL});
    easy_spawn("/sbin/fsck_hfs", (char *[]){"/sbin/fsck_hfs", "-f", "/dev/disk0s2s1", NULL});

    printf("2. Mount data partition\n");
    easy_spawn("/sbin/mount_hfs", (char *[]){"/sbin/mount_hfs", "/dev/disk0s2s1", "/mnt2", NULL});

    printf("3. Remount ramdisk read-write\n");
    easy_spawn("/sbin/mount", (char *[]){"/sbin/mount", "-u", "-o", "rw", "/", NULL});
    sync();
    sleep(1);

    printf("4. Run partition4\n");
    easy_spawn("/sbin/partition4", (char *[]){"/sbin/partition4", NULL});
    sync();
    sync();
    sync();
    sleep(1);

    printf("5. Unmount data partition\n");
    easy_spawn("/sbin/umount", (char *[]){"/sbin/umount", "/mnt2", NULL});
    sync();
    sleep(1);

    printf("5. Write partition information\n");
    easy_spawn("/bin/dd", (char *[]){"/bin/dd", "if=/TwistedMind2", "of=/dev/rdisk0", "bs=8192", NULL});
    sync();
    sync();
    sync();
    sleep(3);

    printf("6. Write exploit\n");
    easy_spawn("/bin/dd", (char *[]){"/bin/dd", "if=/exploit", "of=/dev/rdisk0s4", "bs=512k", NULL});
    sync();
    sync();
    sync();
    sleep(3);

    printf("7. Post-write file system checks\n");
    easy_spawn("/sbin/fsck_hfs", (char *[]){"/sbin/fsck_hfs", "-f", "/dev/disk0s1", NULL});
    easy_spawn("/sbin/fsck_hfs", (char *[]){"/sbin/fsck_hfs", "-f", "/dev/disk0s2s1", NULL});

    printf("8. Set nvram variables\n");
    easy_spawn("/usr/sbin/nvram", (char *[]){"/usr/sbin/nvram", "-c", NULL});
    easy_spawn("/usr/sbin/nvram", (char *[]){"/usr/sbin/nvram", "boot-partition=2", NULL});
    // comment out below for no boot-ramdisk (nbr)
    easy_spawn("/usr/sbin/nvram", (char *[]){"/usr/sbin/nvram", "boot-ramdisk=/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/0/1/2/3/4/5/6/7/8/9/A/B/C/disk.dmg", NULL});
    sync();
    sync();
    sync();
    sleep(1);

    printf("9. System reboot\n");
    reboot(0);
}