text: #include <AK/AKString.h>
  #include <AK/Vector.h>
  #include <Kernel/Syscall.h>
  #include <assert.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <grp.h>
  #include <pwd.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/ioctl.h>
  #include <sys/types.h>
  #include <unistd.h>
  
  extern "C" {
  
  int systrace(pid_t pid)
  {
      int rc = syscall(SC_systrace, pid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int chown(const char* pathname, uid_t uid, gid_t gid)
  {
      int rc = syscall(SC_chown, pathname, uid, gid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int fchown(int fd, uid_t uid, gid_t gid)
  {
      int rc = syscall(SC_fchown, fd, uid, gid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  pid_t fork()
  {
      int rc = syscall(SC_fork);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int execv(const char* path, char* const argv[])
  {
      return execve(path, argv, environ);
  }
  
  int execve(const char* filename, char* const argv[], char* const envp[])
  {
      int rc = syscall(SC_execve, filename, argv, envp);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int execvpe(const char* filename, char* const argv[], char* const envp[])
  {
      int rc = execve(filename, argv, envp);
      if (rc < 0 && errno != ENOENT) {
          fprintf(stderr, "execvpe() failed on first with %s\n", strerror(errno));
          return rc;
      }
      String path = getenv("PATH");
      if (path.is_empty())
          path = "/bin:/usr/bin";
      auto parts = path.split(':');
      for (auto& part : parts) {
          auto candidate = String::format("%s/%s", part.characters(), filename);
          int rc = execve(candidate.characters(), argv, envp);
          if (rc < 0 && errno != ENOENT) {
              printf("execvpe() failed on attempt (%s) with %s\n", candidate.characters(), strerror(errno));
              return rc;
          }
      }
      errno = ENOENT;
      return -1;
  }
  
  int execvp(const char* filename, char* const argv[])
  {
      return execvpe(filename, argv, environ);
  }
  
  int execl(const char* filename, const char* arg0, ...)
  {
      Vector<const char*, 16> args;
      args.append(arg0);
  
      va_list ap;
      va_start(ap, arg0);
      for (;;) {
          const char* arg = va_arg(ap, const char*);
          if (!arg)
              break;
          args.append(arg);
      }
      va_end(ap);
      args.append(nullptr);
      return execve(filename, const_cast<char* const*>(args.data()), environ);
  }
  
  uid_t getuid()
  {
      return syscall(SC_getuid);
  }
  
  gid_t getgid()
  {
      return syscall(SC_getgid);
  }
  
  uid_t geteuid()
  {
      return syscall(SC_geteuid);
  }
  
  gid_t getegid()
  {
      return syscall(SC_getegid);
  }
  
  pid_t getpid()
  {
      return syscall(SC_getpid);
  }
  
  pid_t getppid()
  {
      return syscall(SC_getppid);
  }
  
  pid_t setsid()
  {
      int rc = syscall(SC_setsid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  pid_t tcgetpgrp(int fd)
  {
      return ioctl(fd, TIOCGPGRP);
  }
  
  int tcsetpgrp(int fd, pid_t pgid)
  {
      return ioctl(fd, TIOCSPGRP, pgid);
  }
  
  int setpgid(pid_t pid, pid_t pgid)
  {
      int rc = syscall(SC_setpgid, pid, pgid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  pid_t getpgid(pid_t pid)
  {
      int rc = syscall(SC_getpgid, pid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  pid_t getpgrp()
  {
      int rc = syscall(SC_getpgrp);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int creat(const char* path, mode_t mode)
  {
      return open(path, O_CREAT | O_WRONLY | O_TRUNC, mode);
  }
  
  int creat_with_path_length(const char* path, size_t path_length, mode_t mode)
  {
      return open_with_path_length(path, path_length, O_CREAT | O_WRONLY | O_TRUNC, mode);
  }
  
  int open_with_path_length(const char* path, size_t path_length, int options, mode_t mode)
  {
      if (path_length > INT32_MAX) {
          errno = EINVAL;
          return -1;
      }
      Syscall::SC_open_params params { path, (int)path_length, options, mode };
      int rc = syscall(SC_open, &params);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int open(const char* path, int options, ...)
  {
      va_list ap;
      va_start(ap, options);
      auto mode = (mode_t)va_arg(ap, unsigned);
      va_end(ap);
      return open_with_path_length(path, strlen(path), options, mode);
  }
  
  ssize_t read(int fd, void* buf, size_t count)
  {
      int rc = syscall(SC_read, fd, buf, count);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  ssize_t write(int fd, const void* buf, size_t count)
  {
      int rc = syscall(SC_write, fd, buf, count);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int ttyname_r(int fd, char* buffer, size_t size)
  {
      int rc = syscall(SC_ttyname_r, fd, buffer, size);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  static char ttyname_buf[32];
  char* ttyname(int fd)
  {
      if (ttyname_r(fd, ttyname_buf, sizeof(ttyname_buf)) < 0)
          return nullptr;
      return ttyname_buf;
  }
  
  int close(int fd)
  {
      int rc = syscall(SC_close, fd);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  pid_t waitpid(pid_t waitee, int* wstatus, int options)
  {
      int rc = syscall(SC_waitpid, waitee, wstatus, options);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int lstat(const char* path, struct stat* statbuf)
  {
      int rc = syscall(SC_lstat, path, statbuf);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int stat(const char* path, struct stat* statbuf)
  {
      int rc = syscall(SC_stat, path, statbuf);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int fstat(int fd, struct stat* statbuf)
  {
      int rc = syscall(SC_fstat, fd, statbuf);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int chdir(const char* path)
  {
      int rc = syscall(SC_chdir, path);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  char* getcwd(char* buffer, size_t size)
  {
      if (!buffer) {
          size = size ? size : PATH_MAX;
          buffer = (char*)malloc(size);
      }
      int rc = syscall(SC_getcwd, buffer, size);
      __RETURN_WITH_ERRNO(rc, buffer, nullptr);
  }
  
  char* getwd(char* buf)
  {
      auto* p = getcwd(buf, PATH_MAX);
      return p;
  }
  
  int sleep(unsigned seconds)
  {
      return syscall(SC_sleep, seconds);
  }
  
  int usleep(useconds_t usec)
  {
      return syscall(SC_usleep, usec);
  }
  
  int gethostname(char* buffer, size_t size)
  {
      int rc = syscall(SC_gethostname, buffer, size);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  ssize_t readlink(const char* path, char* buffer, size_t size)
  {
      int rc = syscall(SC_readlink, path, buffer, size);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  off_t lseek(int fd, off_t offset, int whence)
  {
      int rc = syscall(SC_lseek, fd, offset, whence);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int link(const char* old_path, const char* new_path)
  {
      int rc = syscall(SC_link, old_path, new_path);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int unlink(const char* pathname)
  {
      int rc = syscall(SC_unlink, pathname);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int symlink(const char* target, const char* linkpath)
  {
      int rc = syscall(SC_symlink, target, linkpath);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int rmdir(const char* pathname)
  {
      int rc = syscall(SC_rmdir, pathname);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int isatty(int fd)
  {
      int rc = syscall(SC_isatty, fd);
      __RETURN_WITH_ERRNO(rc, 1, 0);
  }
  
  int getdtablesize()
  {
      int rc = syscall(SC_getdtablesize);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int dup(int old_fd)
  {
      int rc = syscall(SC_dup, old_fd);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int dup2(int old_fd, int new_fd)
  {
      int rc = syscall(SC_dup2, old_fd, new_fd);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int setgroups(size_t size, const gid_t* list)
  {
      int rc = syscall(SC_getgroups, size, list);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int getgroups(int size, gid_t list[])
  {
      int rc = syscall(SC_getgroups, size, list);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int pipe(int pipefd[2])
  {
      int rc = syscall(SC_pipe, pipefd);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  unsigned int alarm(unsigned int seconds)
  {
      return syscall(SC_alarm, seconds);
  }
  
  int setuid(uid_t uid)
  {
      int rc = syscall(SC_setuid, uid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int setgid(uid_t gid)
  {
      int rc = syscall(SC_setgid, gid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int access(const char* pathname, int mode)
  {
      int rc = syscall(SC_access, pathname, mode);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int mknod(const char* pathname, mode_t mode, dev_t dev)
  {
      int rc = syscall(SC_mknod, pathname, mode, dev);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  long fpathconf(int fd, int name)
  {
      (void)fd;
      (void)name;
      ASSERT_NOT_REACHED();
  }
  
  long pathconf(const char* path, int name)
  {
      (void)path;
      (void)name;
      ASSERT_NOT_REACHED();
  }
  
  void _exit(int status)
  {
      syscall(SC_exit, status);
      ASSERT_NOT_REACHED();
  }
  
  void sync()
  {
      syscall(SC_sync);
  }
  
  int read_tsc(unsigned* lsw, unsigned* msw)
  {
      int rc = syscall(SC_read_tsc, lsw, msw);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int create_shared_buffer(pid_t peer_pid, int size, void** buffer)
  {
      int rc = syscall(SC_create_shared_buffer, peer_pid, size, buffer);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  void* get_shared_buffer(int shared_buffer_id)
  {
      int rc = syscall(SC_get_shared_buffer, shared_buffer_id);
      if (rc < 0 && -rc < EMAXERRNO) {
          errno = -rc;
          return (void*)-1;
      }
      return (void*)rc;
  }
  
  int release_shared_buffer(int shared_buffer_id)
  {
      int rc = syscall(SC_release_shared_buffer, shared_buffer_id);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int get_shared_buffer_size(int shared_buffer_id)
  {
      int rc = syscall(SC_get_shared_buffer_size, shared_buffer_id);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int seal_shared_buffer(int shared_buffer_id)
  {
      int rc = syscall(SC_seal_shared_buffer, shared_buffer_id);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  char* getlogin()
  {
      static char __getlogin_buffer[256];
      if (auto* passwd = getpwuid(getuid())) {
          strncpy(__getlogin_buffer, passwd->pw_name, sizeof(__getlogin_buffer));
          return __getlogin_buffer;
      }
      return nullptr;
  }
  
  int create_thread(int (*entry)(void*), void* argument)
  {
      int rc = syscall(SC_create_thread, entry, argument);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  void exit_thread(int code)
  {
      syscall(SC_exit_thread, code);
      ASSERT_NOT_REACHED();
  }
  
  int ftruncate(int fd, off_t length)
  {
      int rc = syscall(SC_ftruncate, fd, length);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int gettid()
  {
      int rc = syscall(SC_gettid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  int donate(int tid)
  {
      int rc = syscall(SC_donate, tid);
      __RETURN_WITH_ERRNO(rc, rc, -1);
  }
  
  void sysbeep()
  {
      syscall(SC_beep);
  }
  
  int fsync(int fd)
  {
      UNUSED_PARAM(fd);
      dbgprintf("FIXME: Implement fsync()\n");
      return 0;
  }
  }
  