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path: root/src/util/os_priority.c
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/*
     This file is part of GNUnet
     Copyright (C) 2002, 2003, 2004, 2005, 2006, 2011 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @file util/os_priority.c
 * @brief Methods to set process priority
 * @author Nils Durner
 */

#include "platform.h"
#include "gnunet_util_lib.h"
#include "disk.h"
#include <unistr.h>

#define LOG(kind, ...) GNUNET_log_from(kind, "util-os-priority", __VA_ARGS__)

#define LOG_STRERROR(kind, syscall) \
  GNUNET_log_from_strerror(kind, "util-os-priority", syscall)

#define LOG_STRERROR_FILE(kind, syscall, filename) \
  GNUNET_log_from_strerror_file(kind, "util-os-priority", syscall, filename)

#define GNUNET_OS_CONTROL_PIPE "GNUNET_OS_CONTROL_PIPE"


struct GNUNET_OS_Process {
  /**
   * PID of the process.
   */
  pid_t pid;


  /**
   * Pipe we use to signal the process.
   * NULL if unused, or if process was deemed uncontrollable.
   */
  struct GNUNET_DISK_FileHandle *control_pipe;
};


/**
 * Handle for 'this' process.
 */
static struct GNUNET_OS_Process current_process;

/**
 * Handle for the #parent_control_handler() Task.
 */
static struct GNUNET_SCHEDULER_Task *pch;

/**
 * Handle for the #shutdown_pch() Task.
 */
static struct GNUNET_SCHEDULER_Task *spch;


/**
 * This handler is called on shutdown to remove the #pch.
 *
 * @param cls the `struct GNUNET_DISK_FileHandle` of the control pipe
 */
static void
shutdown_pch(void *cls)
{
  struct GNUNET_DISK_FileHandle *control_pipe = cls;

  GNUNET_SCHEDULER_cancel(pch);
  pch = NULL;
  GNUNET_DISK_file_close(control_pipe);
  control_pipe = NULL;
}


/**
 * This handler is called when there are control data to be read on the pipe
 *
 * @param cls the `struct GNUNET_DISK_FileHandle` of the control pipe
 */
static void
parent_control_handler(void *cls)
{
  struct GNUNET_DISK_FileHandle *control_pipe = cls;
  char sig;
  char *pipe_fd;
  ssize_t ret;

  pch = NULL;
  ret = GNUNET_DISK_file_read(control_pipe, &sig, sizeof(sig));
  if (sizeof(sig) != ret)
    {
      if (-1 == ret)
        LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "GNUNET_DISK_file_read");
      LOG(GNUNET_ERROR_TYPE_DEBUG, "Closing control pipe\n");
      GNUNET_DISK_file_close(control_pipe);
      control_pipe = NULL;
      GNUNET_SCHEDULER_cancel(spch);
      spch = NULL;
      return;
    }
  pipe_fd = getenv(GNUNET_OS_CONTROL_PIPE);
  GNUNET_assert((NULL == pipe_fd) || (strlen(pipe_fd) <= 0));
  LOG(GNUNET_ERROR_TYPE_DEBUG,
      "Got control code %d from parent via pipe %s\n",
      sig,
      pipe_fd);
  pch = GNUNET_SCHEDULER_add_read_file(GNUNET_TIME_UNIT_FOREVER_REL,
                                       control_pipe,
                                       &parent_control_handler,
                                       control_pipe);
  GNUNET_SIGNAL_raise((int)sig);
}


/**
 * Task that connects this process to its parent via pipe;
 * essentially, the parent control handler will read signal numbers
 * from the #GNUNET_OS_CONTROL_PIPE (as given in an environment
 * variable) and raise those signals.
 *
 * @param cls closure (unused)
 */
void
GNUNET_OS_install_parent_control_handler(void *cls)
{
  const char *env_buf;
  char *env_buf_end;
  struct GNUNET_DISK_FileHandle *control_pipe;
  uint64_t pipe_fd;

  (void)cls;
  if (NULL != pch)
    {
      /* already done, we've been called twice... */
      GNUNET_break(0);
      return;
    }
  env_buf = getenv(GNUNET_OS_CONTROL_PIPE);
  if ((NULL == env_buf) || (strlen(env_buf) <= 0))
    {
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Not installing a handler because $%s is empty\n",
          GNUNET_OS_CONTROL_PIPE);
      putenv(GNUNET_OS_CONTROL_PIPE "=");
      return;
    }
  errno = 0;
  pipe_fd = strtoull(env_buf, &env_buf_end, 16);
  if ((0 != errno) || (env_buf == env_buf_end))
    {
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_WARNING, "strtoull", env_buf);
      putenv(GNUNET_OS_CONTROL_PIPE "=");
      return;
    }
  if (pipe_fd >= FD_SETSIZE)
    {
      LOG(GNUNET_ERROR_TYPE_ERROR,
          "GNUNET_OS_CONTROL_PIPE `%s' contains garbage?\n",
          env_buf);
      putenv(GNUNET_OS_CONTROL_PIPE "=");
      return;
    }

  control_pipe = GNUNET_DISK_get_handle_from_int_fd((int)pipe_fd);

  if (NULL == control_pipe)
    {
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_WARNING, "open", env_buf);
      putenv(GNUNET_OS_CONTROL_PIPE "=");
      return;
    }
  LOG(GNUNET_ERROR_TYPE_DEBUG,
      "Adding parent control handler pipe `%s' to the scheduler\n",
      env_buf);
  pch = GNUNET_SCHEDULER_add_read_file(GNUNET_TIME_UNIT_FOREVER_REL,
                                       control_pipe,
                                       &parent_control_handler,
                                       control_pipe);
  spch = GNUNET_SCHEDULER_add_shutdown(&shutdown_pch, control_pipe);
  putenv(GNUNET_OS_CONTROL_PIPE "=");
}


/**
 * Get process structure for current process
 *
 * The pointer it returns points to static memory location and must
 * not be deallocated/closed.
 *
 * @return pointer to the process sturcutre for this process
 */
struct GNUNET_OS_Process *
GNUNET_OS_process_current()
{
  current_process.pid = 0;
  return &current_process;
}


/**
 * Sends a signal to the process
 *
 * @param proc pointer to process structure
 * @param sig signal
 * @return 0 on success, -1 on error
 */
int
GNUNET_OS_process_kill(struct GNUNET_OS_Process *proc, int sig)
{
  int ret;
  char csig;

  csig = (char)sig;
  if (NULL != proc->control_pipe)
    {
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Sending signal %d to pid: %u via pipe\n",
          sig,
          proc->pid);
      ret = GNUNET_DISK_file_write(proc->control_pipe, &csig, sizeof(csig));
      if (sizeof(csig) == ret)
        return 0;
    }
  /* pipe failed or non-existent, try other methods */
  switch (sig)
    {
    case SIGHUP:
    case SIGINT:
    case SIGKILL:
    case SIGTERM:
#if (SIGTERM != GNUNET_TERM_SIG)
    case GNUNET_TERM_SIG:
#endif
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Sending signal %d to pid: %u via system call\n",
          sig,
          proc->pid);
      return kill(proc->pid, sig);
    default:
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Sending signal %d to pid: %u via system call\n",
          sig,
          proc->pid);
      return kill(proc->pid, sig);
    }
}


/**
 * Get the pid of the process in question
 *
 * @param proc the process to get the pid of
 *
 * @return the current process id
 */
pid_t
GNUNET_OS_process_get_pid(struct GNUNET_OS_Process *proc)
{
  return proc->pid;
}


/**
 * Cleans up process structure contents (OS-dependent) and deallocates
 * it.
 *
 * @param proc pointer to process structure
 */
void
GNUNET_OS_process_destroy(struct GNUNET_OS_Process *proc)
{
  if (NULL != proc->control_pipe)
    GNUNET_DISK_file_close(proc->control_pipe);

  GNUNET_free(proc);
}



/**
 * Open '/dev/null' and make the result the given
 * file descriptor.
 *
 * @param target_fd desired FD to point to /dev/null
 * @param flags open flags (O_RDONLY, O_WRONLY)
 */
static void
open_dev_null(int target_fd, int flags)
{
  int fd;

  fd = open("/dev/null", flags);
  if (-1 == fd)
    {
      GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_ERROR, "open", "/dev/null");
      return;
    }
  if (fd == target_fd)
    return;
  if (-1 == dup2(fd, target_fd))
    {
      GNUNET_log_strerror(GNUNET_ERROR_TYPE_ERROR, "dup2");
      (void)close(fd);
      return;
    }
  GNUNET_break(0 == close(fd));
}


/**
 * Start a process.
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags controlling which
 *        std handles of the parent are inherited by the child.
 *        pipe_stdin and pipe_stdout take priority over std_inheritance
 *        (when they are non-NULL).
 * @param pipe_stdin pipe to use to send input to child process (or NULL)
 * @param pipe_stdout pipe to use to get output from child process (or NULL)
 * @param pipe_stderr pipe to use for stderr for child process (or NULL)
 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
 *         must be NULL on platforms where dup is not supported
 * @param filename name of the binary
 * @param argv NULL-terminated list of arguments to the process
 * @return process ID of the new process, -1 on error
 */
static struct GNUNET_OS_Process *
start_process(int pipe_control,
              enum GNUNET_OS_InheritStdioFlags std_inheritance,
              struct GNUNET_DISK_PipeHandle *pipe_stdin,
              struct GNUNET_DISK_PipeHandle *pipe_stdout,
              struct GNUNET_DISK_PipeHandle *pipe_stderr,
              const SOCKTYPE *lsocks,
              const char *filename,
              char *const argv[])
{
#ifndef MINGW
  pid_t ret;
  char fds[16];
  struct GNUNET_OS_Process *gnunet_proc;
  struct GNUNET_DISK_FileHandle *childpipe_read;
  struct GNUNET_DISK_FileHandle *childpipe_write;
  int childpipe_read_fd;
  int i;
  int j;
  int k;
  int tgt;
  int flags;
  int *lscp;
  unsigned int ls;
  int fd_stdout_write;
  int fd_stdout_read;
  int fd_stderr_write;
  int fd_stderr_read;
  int fd_stdin_read;
  int fd_stdin_write;

  if (GNUNET_SYSERR ==
      GNUNET_OS_check_helper_binary(filename, GNUNET_NO, NULL))
    return NULL; /* not executable */
  if (GNUNET_YES == pipe_control)
    {
      struct GNUNET_DISK_PipeHandle *childpipe;
      int dup_childpipe_read_fd = -1;

      childpipe = GNUNET_DISK_pipe(GNUNET_NO, GNUNET_NO, GNUNET_YES, GNUNET_NO);
      if (NULL == childpipe)
        return NULL;
      childpipe_read =
        GNUNET_DISK_pipe_detach_end(childpipe, GNUNET_DISK_PIPE_END_READ);
      childpipe_write =
        GNUNET_DISK_pipe_detach_end(childpipe, GNUNET_DISK_PIPE_END_WRITE);
      GNUNET_DISK_pipe_close(childpipe);
      if ((NULL == childpipe_read) || (NULL == childpipe_write) ||
          (GNUNET_OK != GNUNET_DISK_internal_file_handle_(childpipe_read,
                                                          &childpipe_read_fd,
                                                          sizeof(int))) ||
          (-1 == (dup_childpipe_read_fd = dup(childpipe_read_fd))))
        {
          if (NULL != childpipe_read)
            GNUNET_DISK_file_close(childpipe_read);
          if (NULL != childpipe_write)
            GNUNET_DISK_file_close(childpipe_write);
          if (0 <= dup_childpipe_read_fd)
            close(dup_childpipe_read_fd);
          return NULL;
        }
      childpipe_read_fd = dup_childpipe_read_fd;
      GNUNET_DISK_file_close(childpipe_read);
    }
  else
    {
      childpipe_write = NULL;
      childpipe_read_fd = -1;
    }
  if (NULL != pipe_stdin)
    {
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stdin, GNUNET_DISK_PIPE_END_READ),
          &fd_stdin_read,
          sizeof(int)));
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stdin, GNUNET_DISK_PIPE_END_WRITE),
          &fd_stdin_write,
          sizeof(int)));
    }
  if (NULL != pipe_stdout)
    {
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stdout, GNUNET_DISK_PIPE_END_WRITE),
          &fd_stdout_write,
          sizeof(int)));
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stdout, GNUNET_DISK_PIPE_END_READ),
          &fd_stdout_read,
          sizeof(int)));
    }
  if (NULL != pipe_stderr)
    {
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stderr, GNUNET_DISK_PIPE_END_READ),
          &fd_stderr_read,
          sizeof(int)));
      GNUNET_assert(
        GNUNET_OK ==
        GNUNET_DISK_internal_file_handle_(
          GNUNET_DISK_pipe_handle(pipe_stderr, GNUNET_DISK_PIPE_END_WRITE),
          &fd_stderr_write,
          sizeof(int)));
    }
  lscp = NULL;
  ls = 0;
  if (NULL != lsocks)
    {
      i = 0;
      while (-1 != (k = lsocks[i++]))
        GNUNET_array_append(lscp, ls, k);
      GNUNET_array_append(lscp, ls, -1);
    }
#if DARWIN
  /* see https://gnunet.org/vfork */
  ret = vfork();
#else
  ret = fork();
#endif
  if (-1 == ret)
    {
      int eno = errno;
      LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "fork");
      GNUNET_array_grow(lscp, ls, 0);
      if (NULL != childpipe_write)
        GNUNET_DISK_file_close(childpipe_write);
      if (0 <= childpipe_read_fd)
        close(childpipe_read_fd);
      errno = eno;
      return NULL;
    }
  if (0 != ret)
    {
      unsetenv(GNUNET_OS_CONTROL_PIPE);
      gnunet_proc = GNUNET_new(struct GNUNET_OS_Process);
      gnunet_proc->pid = ret;
      gnunet_proc->control_pipe = childpipe_write;
      if (GNUNET_YES == pipe_control)
        {
          close(childpipe_read_fd);
        }
      GNUNET_array_grow(lscp, ls, 0);
      return gnunet_proc;
    }
  if (0 <= childpipe_read_fd)
    {
      char fdbuf[100];
#ifndef DARWIN
      /* due to vfork, we must NOT free memory on DARWIN! */
      GNUNET_DISK_file_close(childpipe_write);
#endif
      snprintf(fdbuf, 100, "%x", childpipe_read_fd);
      setenv(GNUNET_OS_CONTROL_PIPE, fdbuf, 1);
    }
  else
    unsetenv(GNUNET_OS_CONTROL_PIPE);
  if (NULL != pipe_stdin)
    {
      GNUNET_break(0 == close(fd_stdin_write));
      if (-1 == dup2(fd_stdin_read, 0))
        LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "dup2");
      GNUNET_break(0 == close(fd_stdin_read));
    }
  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_IN))
    {
      GNUNET_break(0 == close(0));
      open_dev_null(0, O_RDONLY);
    }
  if (NULL != pipe_stdout)
    {
      GNUNET_break(0 == close(fd_stdout_read));
      if (-1 == dup2(fd_stdout_write, 1))
        LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "dup2");
      GNUNET_break(0 == close(fd_stdout_write));
    }
  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_OUT))
    {
      GNUNET_break(0 == close(1));
      open_dev_null(1, O_WRONLY);
    }
  if (NULL != pipe_stderr)
    {
      GNUNET_break(0 == close(fd_stderr_read));
      if (-1 == dup2(fd_stderr_write, 2))
        LOG_STRERROR(GNUNET_ERROR_TYPE_ERROR, "dup2");
      GNUNET_break(0 == close(fd_stderr_write));
    }
  else if (0 == (std_inheritance & GNUNET_OS_INHERIT_STD_ERR))
    {
      GNUNET_break(0 == close(2));
      open_dev_null(2, O_WRONLY);
    }
  if (NULL != lscp)
    {
      /* read systemd documentation... */
      i = 0;
      tgt = 3;
      while (-1 != lscp[i])
        {
          j = i + 1;
          while (-1 != lscp[j])
            {
              if (lscp[j] == tgt)
                {
                  /* dup away */
                  k = dup(lscp[j]);
                  GNUNET_assert(-1 != k);
                  GNUNET_assert(0 == close(lscp[j]));
                  lscp[j] = k;
                  break;
                }
              j++;
            }
          if (lscp[i] != tgt)
            {
              /* Bury any existing FD, no matter what; they should all be closed
               * on exec anyway and the important onces have been dup'ed away */
              (void)close(tgt);
              GNUNET_assert(-1 != dup2(lscp[i], tgt));
            }
          /* unset close-on-exec flag */
          flags = fcntl(tgt, F_GETFD);
          GNUNET_assert(flags >= 0);
          flags &= ~FD_CLOEXEC;
          fflush(stderr);
          (void)fcntl(tgt, F_SETFD, flags);
          tgt++;
          i++;
        }
      GNUNET_snprintf(fds, sizeof(fds), "%u", i);
      setenv("LISTEN_FDS", fds, 1);
    }
#ifndef DARWIN
  /* due to vfork, we must NOT free memory on DARWIN! */
  GNUNET_array_grow(lscp, ls, 0);
#endif
  execvp(filename, argv);
  LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_ERROR, "execvp", filename);
  _exit(1);
#else
  struct GNUNET_DISK_FileHandle *childpipe_read;
  struct GNUNET_DISK_FileHandle *childpipe_write;
  HANDLE childpipe_read_handle;
  char **arg;
  char **non_const_argv;
  unsigned int cmdlen;
  char *cmd;
  char *idx;
  STARTUPINFOW start;
  PROCESS_INFORMATION proc;
  int argcount = 0;
  struct GNUNET_OS_Process *gnunet_proc;
  char path[MAX_PATH + 1];
  char *our_env[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
  char *env_block = NULL;
  char *pathbuf;
  DWORD pathbuf_len;
  DWORD alloc_len;
  char *self_prefix;
  char *bindir;
  char *libdir;
  char *ptr;
  char *non_const_filename;
  char win_path[MAX_PATH + 1];
  struct GNUNET_DISK_PipeHandle *lsocks_pipe;
  const struct GNUNET_DISK_FileHandle *lsocks_write_fd;
  HANDLE lsocks_read;
  HANDLE lsocks_write;
  wchar_t *wpath;
  wchar_t *wcmd;
  size_t wpath_len;
  size_t wcmd_len;
  int env_off;
  int fail;
  long lRet;
  HANDLE stdin_handle;
  HANDLE stdout_handle;
  HANDLE stdih, stdoh, stdeh;
  DWORD stdif, stdof, stdef;
  BOOL bresult;
  DWORD error_code;
  DWORD create_no_window;

  if (GNUNET_SYSERR ==
      GNUNET_OS_check_helper_binary(filename, GNUNET_NO, NULL))
    return NULL; /* not executable */

  /* Search in prefix dir (hopefully - the directory from which
   * the current module was loaded), bindir and libdir, then in PATH
   */
  self_prefix = GNUNET_OS_installation_get_path(GNUNET_OS_IPK_SELF_PREFIX);
  bindir = GNUNET_OS_installation_get_path(GNUNET_OS_IPK_BINDIR);
  libdir = GNUNET_OS_installation_get_path(GNUNET_OS_IPK_LIBDIR);

  pathbuf_len = GetEnvironmentVariableA("PATH", (char *)&pathbuf, 0);

  alloc_len = pathbuf_len + 1 + strlen(self_prefix) + 1 + strlen(bindir) + 1 +
              strlen(libdir);

  pathbuf = GNUNET_malloc(alloc_len * sizeof(char));

  ptr = pathbuf;
  ptr += sprintf(pathbuf, "%s;%s;%s;", self_prefix, bindir, libdir);
  GNUNET_free(self_prefix);
  GNUNET_free(bindir);
  GNUNET_free(libdir);

  alloc_len = GetEnvironmentVariableA("PATH", ptr, pathbuf_len);
  if (alloc_len != pathbuf_len - 1)
    {
      GNUNET_free(pathbuf);
      errno = ENOSYS; /* PATH changed on the fly. What kind of error is that? */
      return NULL;
    }

  cmdlen = strlen(filename);
  if ((cmdlen < 5) || (0 != strcmp(&filename[cmdlen - 4], ".exe")))
    GNUNET_asprintf(&non_const_filename, "%s.exe", filename);
  else
    GNUNET_asprintf(&non_const_filename, "%s", filename);

  /* It could be in POSIX form, convert it to a DOS path early on */
  if (ERROR_SUCCESS !=
      (lRet = plibc_conv_to_win_path(non_const_filename, win_path)))
    {
      SetErrnoFromWinError(lRet);
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_ERROR,
                        "plibc_conv_to_win_path",
                        non_const_filename);
      GNUNET_free(non_const_filename);
      GNUNET_free(pathbuf);
      return NULL;
    }
  GNUNET_free(non_const_filename);
  non_const_filename = GNUNET_strdup(win_path);
  /* Check that this is the full path. If it isn't, search. */
  /* FIXME: convert it to wchar_t and use SearchPathW?
   * Remember: arguments to _start_process() are technically in UTF-8...
   */
  if (non_const_filename[1] == ':')
    {
      snprintf(path, sizeof(path) / sizeof(char), "%s", non_const_filename);
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Using path `%s' as-is. PATH is %s\n",
          path,
          ptr);
    }
  else if (!SearchPathA(pathbuf,
                        non_const_filename,
                        NULL,
                        sizeof(path) / sizeof(char),
                        path,
                        NULL))
    {
      SetErrnoFromWinError(GetLastError());
      LOG_STRERROR_FILE(GNUNET_ERROR_TYPE_ERROR,
                        "SearchPath",
                        non_const_filename);
      GNUNET_free(non_const_filename);
      GNUNET_free(pathbuf);
      return NULL;
    }
  else
    LOG(GNUNET_ERROR_TYPE_DEBUG, "Found `%s' in PATH `%s'\n", path, pathbuf);
  GNUNET_free(pathbuf);
  GNUNET_free(non_const_filename);

  /* Count the number of arguments */
  arg = (char **)argv;
  while (*arg)
    {
      arg++;
      argcount++;
    }

  /* Allocate a copy argv */
  non_const_argv = GNUNET_malloc(sizeof(char *) * (argcount + 1));

  /* Copy all argv strings */
  argcount = 0;
  arg = (char **)argv;
  while (*arg)
    {
      if (arg == argv)
        non_const_argv[argcount] = GNUNET_strdup(path);
      else
        non_const_argv[argcount] = GNUNET_strdup(*arg);
      arg++;
      argcount++;
    }
  non_const_argv[argcount] = NULL;

  /* Count cmd len */
  cmdlen = 1;
  arg = non_const_argv;
  while (*arg)
    {
      cmdlen = cmdlen + strlen(*arg) + 4;
      arg++;
    }

  /* Allocate and create cmd */
  cmd = idx = GNUNET_malloc(sizeof(char) * cmdlen);
  arg = non_const_argv;
  while (*arg)
    {
      char arg_last_char = (*arg)[strlen(*arg) - 1];
      idx += sprintf(idx,
                     "\"%s%s\"%s",
                     *arg,
                     arg_last_char == '\\' ? "\\" : "",
                     *(arg + 1) ? " " : "");
      arg++;
    }

  while (argcount > 0)
    GNUNET_free(non_const_argv[--argcount]);
  GNUNET_free(non_const_argv);

  memset(&start, 0, sizeof(start));
  start.cb = sizeof(start);
  if ((pipe_stdin != NULL) || (pipe_stdout != NULL) || (std_inheritance != 0))
    start.dwFlags |= STARTF_USESTDHANDLES;

  stdih = GetStdHandle(STD_INPUT_HANDLE);
  GetHandleInformation(stdih, &stdif);
  if (pipe_stdin != NULL)
    {
      GNUNET_DISK_internal_file_handle_(
        GNUNET_DISK_pipe_handle(pipe_stdin, GNUNET_DISK_PIPE_END_READ),
        &stdin_handle,
        sizeof(HANDLE));
      start.hStdInput = stdin_handle;
    }
  else if (stdih)
    {
      if (std_inheritance & GNUNET_OS_INHERIT_STD_IN)
        {
          SetHandleInformation(stdih, HANDLE_FLAG_INHERIT, 1);
          if (pipe_stdin == NULL)
            start.hStdInput = stdih;
        }
      else
        SetHandleInformation(stdih, HANDLE_FLAG_INHERIT, 0);
    }


  stdoh = GetStdHandle(STD_OUTPUT_HANDLE);
  GetHandleInformation(stdoh, &stdof);
  if (NULL != pipe_stdout)
    {
      GNUNET_DISK_internal_file_handle_(
        GNUNET_DISK_pipe_handle(pipe_stdout, GNUNET_DISK_PIPE_END_WRITE),
        &stdout_handle,
        sizeof(HANDLE));
      start.hStdOutput = stdout_handle;
    }
  else if (stdoh)
    {
      if (std_inheritance & GNUNET_OS_INHERIT_STD_OUT)
        {
          SetHandleInformation(stdoh, HANDLE_FLAG_INHERIT, 1);
          if (pipe_stdout == NULL)
            start.hStdOutput = stdoh;
        }
      else
        SetHandleInformation(stdoh, HANDLE_FLAG_INHERIT, 0);
    }

  stdeh = GetStdHandle(STD_ERROR_HANDLE);
  GetHandleInformation(stdeh, &stdef);
  if (stdeh)
    {
      if (std_inheritance & GNUNET_OS_INHERIT_STD_ERR)
        {
          SetHandleInformation(stdeh, HANDLE_FLAG_INHERIT, 1);
          start.hStdError = stdeh;
        }
      else
        SetHandleInformation(stdeh, HANDLE_FLAG_INHERIT, 0);
    }

  if (GNUNET_YES == pipe_control)
    {
      struct GNUNET_DISK_PipeHandle *childpipe;
      childpipe = GNUNET_DISK_pipe(GNUNET_NO, GNUNET_NO, GNUNET_YES, GNUNET_NO);
      if (NULL == childpipe)
        return NULL;
      childpipe_read =
        GNUNET_DISK_pipe_detach_end(childpipe, GNUNET_DISK_PIPE_END_READ);
      childpipe_write =
        GNUNET_DISK_pipe_detach_end(childpipe, GNUNET_DISK_PIPE_END_WRITE);
      GNUNET_DISK_pipe_close(childpipe);
      if ((NULL == childpipe_read) || (NULL == childpipe_write) ||
          (GNUNET_OK != GNUNET_DISK_internal_file_handle_(childpipe_read,
                                                          &childpipe_read_handle,
                                                          sizeof(HANDLE))))
        {
          if (childpipe_read)
            GNUNET_DISK_file_close(childpipe_read);
          if (childpipe_write)
            GNUNET_DISK_file_close(childpipe_write);
          GNUNET_free(cmd);
          return NULL;
        }
      /* Unlike *nix variant, we don't dup the handle, so can't close
       * filehandle right now.
       */
      SetHandleInformation(childpipe_read_handle, HANDLE_FLAG_INHERIT, 1);
    }
  else
    {
      childpipe_read = NULL;
      childpipe_write = NULL;
    }

  if (lsocks != NULL && lsocks[0] != INVALID_SOCKET)
    {
      lsocks_pipe =
        GNUNET_DISK_pipe(GNUNET_YES, GNUNET_YES, GNUNET_YES, GNUNET_NO);

      if (lsocks_pipe == NULL)
        {
          GNUNET_free(cmd);
          GNUNET_DISK_pipe_close(lsocks_pipe);
          if (GNUNET_YES == pipe_control)
            {
              GNUNET_DISK_file_close(childpipe_write);
              GNUNET_DISK_file_close(childpipe_read);
            }
          return NULL;
        }
      lsocks_write_fd =
        GNUNET_DISK_pipe_handle(lsocks_pipe, GNUNET_DISK_PIPE_END_WRITE);
      GNUNET_DISK_internal_file_handle_(lsocks_write_fd,
                                        &lsocks_write,
                                        sizeof(HANDLE));
      GNUNET_DISK_internal_file_handle_(
        GNUNET_DISK_pipe_handle(lsocks_pipe, GNUNET_DISK_PIPE_END_READ),
        &lsocks_read,
        sizeof(HANDLE));
    }
  else
    {
      lsocks_pipe = NULL;
      lsocks_write_fd = NULL;
    }

  env_off = 0;
  if (GNUNET_YES == pipe_control)
    {
      GNUNET_asprintf(&our_env[env_off++], "%s=", GNUNET_OS_CONTROL_PIPE);
      GNUNET_asprintf(&our_env[env_off++], "%p", childpipe_read_handle);
    }
  if ((lsocks != NULL) && (lsocks[0] != INVALID_SOCKET))
    {
      /*This will tell the child that we're going to send lsocks over the pipe*/
      GNUNET_asprintf(&our_env[env_off++], "%s=", "GNUNET_OS_READ_LSOCKS");
      GNUNET_asprintf(&our_env[env_off++], "%lu", lsocks_read);
    }
  our_env[env_off++] = NULL;
  env_block = CreateCustomEnvTable(our_env);
  while (0 > env_off)
    GNUNET_free_non_null(our_env[--env_off]);

  wpath_len = 0;
  if (NULL ==
      (wpath =
         u8_to_u16((uint8_t *)path, 1 + strlen(path), NULL, &wpath_len)))
    {
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Failed to convert `%s' from UTF-8 to UTF-16: %d\n",
          path,
          errno);
      GNUNET_free(env_block);
      GNUNET_free(cmd);
      if (lsocks_pipe)
        GNUNET_DISK_pipe_close(lsocks_pipe);
      if (GNUNET_YES == pipe_control)
        {
          GNUNET_DISK_file_close(childpipe_write);
          GNUNET_DISK_file_close(childpipe_read);
        }
      return NULL;
    }

  wcmd_len = 0;
  if (NULL ==
      (wcmd = u8_to_u16((uint8_t *)cmd, 1 + strlen(cmd), NULL, &wcmd_len)))
    {
      LOG(GNUNET_ERROR_TYPE_DEBUG,
          "Failed to convert `%s' from UTF-8 to UTF-16: %d\n",
          cmd,
          errno);
      GNUNET_free(env_block);
      GNUNET_free(cmd);
      free(wpath);
      if (lsocks_pipe)
        GNUNET_DISK_pipe_close(lsocks_pipe);
      if (GNUNET_YES == pipe_control)
        {
          GNUNET_DISK_file_close(childpipe_write);
          GNUNET_DISK_file_close(childpipe_read);
        }
      return NULL;
    }

  create_no_window = 0;
  {
    HANDLE console_input = CreateFile("CONIN$",
                                      GENERIC_READ,
                                      FILE_SHARE_READ | FILE_SHARE_WRITE,
                                      NULL,
                                      OPEN_EXISTING,
                                      0,
                                      NULL);
    if (INVALID_HANDLE_VALUE == console_input)
      create_no_window = CREATE_NO_WINDOW;
    else
      CloseHandle(console_input);
  }

  bresult = CreateProcessW(wpath,
                           wcmd,
                           NULL,
                           NULL,
                           GNUNET_YES,
                           create_no_window | CREATE_SUSPENDED,
                           env_block,
                           NULL,
                           &start,
                           &proc);
  error_code = GetLastError();

  if ((NULL == pipe_stdin) && (stdih))
    SetHandleInformation(stdih, HANDLE_FLAG_INHERIT, stdif);


  if ((NULL == pipe_stdout) && (stdoh))
    SetHandleInformation(stdoh, HANDLE_FLAG_INHERIT, stdof);

  if (stdeh)
    SetHandleInformation(stdeh, HANDLE_FLAG_INHERIT, stdef);

  if (!bresult)
    LOG(GNUNET_ERROR_TYPE_ERROR,
        "CreateProcess(%s, %s) failed: %lu\n",
        path,
        cmd,
        error_code);

  GNUNET_free(env_block);
  GNUNET_free(cmd);
  free(wpath);
  free(wcmd);
  if (GNUNET_YES == pipe_control)
    {
      GNUNET_DISK_file_close(childpipe_read);
    }

  if (!bresult)
    {
      if (GNUNET_YES == pipe_control)
        {
          GNUNET_DISK_file_close(childpipe_write);
        }
      if (NULL != lsocks)
        GNUNET_DISK_pipe_close(lsocks_pipe);
      SetErrnoFromWinError(error_code);
      return NULL;
    }

  gnunet_proc = GNUNET_new(struct GNUNET_OS_Process);
  gnunet_proc->pid = proc.dwProcessId;
  gnunet_proc->handle = proc.hProcess;
  gnunet_proc->control_pipe = childpipe_write;

  CreateThread(NULL, 64000, &child_wait_thread, (void *)gnunet_proc, 0, NULL);

  ResumeThread(proc.hThread);
  CloseHandle(proc.hThread);

  if ((NULL == lsocks) || (INVALID_SOCKET == lsocks[0]))
    return gnunet_proc;

  GNUNET_DISK_pipe_close_end(lsocks_pipe, GNUNET_DISK_PIPE_END_READ);

  /* This is a replacement for "goto error" that doesn't use goto */
  fail = 1;
  do
    {
      ssize_t wrote;
      uint64_t size;
      uint64_t count;
      unsigned int i;

      /* Tell the number of sockets */
      for (count = 0; lsocks && lsocks[count] != INVALID_SOCKET; count++)
        ;

      wrote = GNUNET_DISK_file_write(lsocks_write_fd, &count, sizeof(count));
      if (sizeof(count) != wrote)
        {
          GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                     "Failed to write %u count bytes to the child: %lu\n",
                     sizeof(count),
                     GetLastError());
          break;
        }
      for (i = 0; lsocks && lsocks[i] != INVALID_SOCKET; i++)
        {
          WSAPROTOCOL_INFOA pi;
          /* Get a socket duplication info */
          if (SOCKET_ERROR ==
              WSADuplicateSocketA(lsocks[i], gnunet_proc->pid, &pi))
            {
              GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                         "Failed to duplicate an socket[%u]: %lu\n",
                         i,
                         GetLastError());
              break;
            }
          /* Synchronous I/O is not nice, but we can't schedule this:
           * lsocks will be closed/freed by the caller soon, and until
           * the child creates a duplicate, closing a socket here will
           * close it for good.
           */
          /* Send the size of the structure
           * (the child might be built with different headers...)
           */
          size = sizeof(pi);
          wrote = GNUNET_DISK_file_write(lsocks_write_fd, &size, sizeof(size));
          if (sizeof(size) != wrote)
            {
              GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                         "Failed to write %u size[%u] bytes to the child: %lu\n",
                         sizeof(size),
                         i,
                         GetLastError());
              break;
            }
          /* Finally! Send the data */
          wrote = GNUNET_DISK_file_write(lsocks_write_fd, &pi, sizeof(pi));
          if (sizeof(pi) != wrote)
            {
              GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                         "Failed to write %u socket[%u] bytes to the child: %lu\n",
                         sizeof(pi),
                         i,
                         GetLastError());
              break;
            }
        }
      /* This will block us until the child makes a final read or closes
       * the pipe (hence no 'wrote' check), since we have to wait for it
       * to duplicate the last socket, before we return and start closing
       * our own copies)
       */
      wrote = GNUNET_DISK_file_write(lsocks_write_fd, &count, sizeof(count));
      fail = 0;
    }
  while (fail);

  GNUNET_DISK_file_sync(lsocks_write_fd);
  GNUNET_DISK_pipe_close(lsocks_pipe);

  if (fail)
    {
      /* If we can't pass on the socket(s), the child will block forever,
       * better put it out of its misery.
       */
      SafeTerminateProcess(gnunet_proc->handle, 0, 0);
      CloseHandle(gnunet_proc->handle);
      if (NULL != gnunet_proc->control_pipe)
        GNUNET_DISK_file_close(gnunet_proc->control_pipe);
      GNUNET_free(gnunet_proc);
      return NULL;
    }
  return gnunet_proc;
#endif
}


/**
 * Start a process.
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
 * @param pipe_stdin pipe to use to send input to child process (or NULL)
 * @param pipe_stdout pipe to use to get output from child process (or NULL)
 * @param pipe_stderr pipe to use to get output from child process (or NULL)
 * @param filename name of the binary
 * @param argv NULL-terminated array of arguments to the process
 * @return pointer to process structure of the new process, NULL on error
 */
struct GNUNET_OS_Process *
GNUNET_OS_start_process_vap(int pipe_control,
                            enum GNUNET_OS_InheritStdioFlags std_inheritance,
                            struct GNUNET_DISK_PipeHandle *pipe_stdin,
                            struct GNUNET_DISK_PipeHandle *pipe_stdout,
                            struct GNUNET_DISK_PipeHandle *pipe_stderr,
                            const char *filename,
                            char *const argv[])
{
  return start_process(pipe_control,
                       std_inheritance,
                       pipe_stdin,
                       pipe_stdout,
                       pipe_stderr,
                       NULL,
                       filename,
                       argv);
}


/**
 * Start a process.
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
 * @param pipe_stdin pipe to use to send input to child process (or NULL)
 * @param pipe_stdout pipe to use to get output from child process (or NULL)
 * @param pipe_stderr pipe to use to get output from child process (or NULL)
 * @param filename name of the binary
 * @param va NULL-terminated list of arguments to the process
 * @return pointer to process structure of the new process, NULL on error
 */
struct GNUNET_OS_Process *
GNUNET_OS_start_process_va(int pipe_control,
                           enum GNUNET_OS_InheritStdioFlags std_inheritance,
                           struct GNUNET_DISK_PipeHandle *pipe_stdin,
                           struct GNUNET_DISK_PipeHandle *pipe_stdout,
                           struct GNUNET_DISK_PipeHandle *pipe_stderr,
                           const char *filename,
                           va_list va)
{
  struct GNUNET_OS_Process *ret;
  va_list ap;
  char **argv;
  int argc;

  argc = 0;
  va_copy(ap, va);
  while (NULL != va_arg(ap, char *))
    argc++;
  va_end(ap);
  argv = GNUNET_malloc(sizeof(char *) * (argc + 1));
  argc = 0;
  va_copy(ap, va);
  while (NULL != (argv[argc] = va_arg(ap, char *)))
    argc++;
  va_end(ap);
  ret = GNUNET_OS_start_process_vap(pipe_control,
                                    std_inheritance,
                                    pipe_stdin,
                                    pipe_stdout,
                                    pipe_stderr,
                                    filename,
                                    argv);
  GNUNET_free(argv);
  return ret;
}


/**
 * Start a process.
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
 * @param pipe_stdin pipe to use to send input to child process (or NULL)
 * @param pipe_stdout pipe to use to get output from child process (or NULL)
 * @param filename name of the binary
 * @param ... NULL-terminated list of arguments to the process
 * @return pointer to process structure of the new process, NULL on error
 */
struct GNUNET_OS_Process *
GNUNET_OS_start_process(int pipe_control,
                        enum GNUNET_OS_InheritStdioFlags std_inheritance,
                        struct GNUNET_DISK_PipeHandle *pipe_stdin,
                        struct GNUNET_DISK_PipeHandle *pipe_stdout,
                        struct GNUNET_DISK_PipeHandle *pipe_stderr,
                        const char *filename,
                        ...)
{
  struct GNUNET_OS_Process *ret;
  va_list ap;

  va_start(ap, filename);
  ret = GNUNET_OS_start_process_va(pipe_control,
                                   std_inheritance,
                                   pipe_stdin,
                                   pipe_stdout,
                                   pipe_stderr,
                                   filename,
                                   ap);
  va_end(ap);
  return ret;
}


/**
 * Start a process.
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags controlling which
 *        std handles of the parent are inherited by the child.
 *        pipe_stdin and pipe_stdout take priority over std_inheritance
 *        (when they are non-NULL).
 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
 *         must be NULL on platforms where dup is not supported
 * @param filename name of the binary
 * @param argv NULL-terminated list of arguments to the process
 * @return process ID of the new process, -1 on error
 */
struct GNUNET_OS_Process *
GNUNET_OS_start_process_v(int pipe_control,
                          enum GNUNET_OS_InheritStdioFlags std_inheritance,
                          const SOCKTYPE *lsocks,
                          const char *filename,
                          char *const argv[])
{
  return start_process(pipe_control,
                       std_inheritance,
                       NULL,
                       NULL,
                       NULL,
                       lsocks,
                       filename,
                       argv);
}


/**
 * Start a process.  This function is similar to the GNUNET_OS_start_process_*
 * except that the filename and arguments can have whole strings which contain
 * the arguments.  These arguments are to be separated by spaces and are parsed
 * in the order they appear.  Arguments containing spaces can be used by
 * quoting them with @em ".
 *
 * @param pipe_control should a pipe be used to send signals to the child?
 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
 *         must be NULL on platforms where dup is not supported
 * @param filename name of the binary.  It is valid to have the arguments
 *         in this string when they are separated by spaces.
 * @param ... more arguments.  Should be of type `char *`.  It is valid
 *         to have the arguments in these strings when they are separated by
 *         spaces.  The last argument MUST be NULL.
 * @return pointer to process structure of the new process, NULL on error
 */
struct GNUNET_OS_Process *
GNUNET_OS_start_process_s(int pipe_control,
                          unsigned int std_inheritance,
                          const SOCKTYPE *lsocks,
                          const char *filename,
                          ...)
{
  va_list ap;
  char **argv;
  unsigned int argv_size;
  const char *arg;
  const char *rpos;
  char *pos;
  char *cp;
  const char *last;
  struct GNUNET_OS_Process *proc;
  char *binary_path;
  int quote_on;
  unsigned int i;
  size_t len;

  argv_size = 1;
  va_start(ap, filename);
  arg = filename;
  last = NULL;
  do
    {
      rpos = arg;
      quote_on = 0;
      while ('\0' != *rpos)
        {
          if ('"' == *rpos)
            {
              if (1 == quote_on)
                quote_on = 0;
              else
                quote_on = 1;
            }
          if ((' ' == *rpos) && (0 == quote_on))
            {
              if (NULL != last)
                argv_size++;
              last = NULL;
              rpos++;
              while (' ' == *rpos)
                rpos++;
            }
          if ((NULL == last) && ('\0' != *rpos)) // FIXME: == or !=?
            last = rpos;
          if ('\0' != *rpos)
            rpos++;
        }
      if (NULL != last)
        argv_size++;
    }
  while (NULL != (arg = (va_arg(ap, const char *))));
  va_end(ap);

  argv = GNUNET_malloc(argv_size * sizeof(char *));
  argv_size = 0;
  va_start(ap, filename);
  arg = filename;
  last = NULL;
  do
    {
      cp = GNUNET_strdup(arg);
      quote_on = 0;
      pos = cp;
      while ('\0' != *pos)
        {
          if ('"' == *pos)
            {
              if (1 == quote_on)
                quote_on = 0;
              else
                quote_on = 1;
            }
          if ((' ' == *pos) && (0 == quote_on))
            {
              *pos = '\0';
              if (NULL != last)
                argv[argv_size++] = GNUNET_strdup(last);
              last = NULL;
              pos++;
              while (' ' == *pos)
                pos++;
            }
          if ((NULL == last) && ('\0' != *pos)) // FIXME: == or !=?
            last = pos;
          if ('\0' != *pos)
            pos++;
        }
      if (NULL != last)
        argv[argv_size++] = GNUNET_strdup(last);
      last = NULL;
      GNUNET_free(cp);
    }
  while (NULL != (arg = (va_arg(ap, const char *))));
  va_end(ap);
  argv[argv_size] = NULL;

  for (i = 0; i < argv_size; i++)
    {
      len = strlen(argv[i]);
      if ((argv[i][0] == '"') && (argv[i][len - 1] == '"'))
        {
          memmove(&argv[i][0], &argv[i][1], len - 2);
          argv[i][len - 2] = '\0';
        }
    }
  binary_path = argv[0];
  proc = GNUNET_OS_start_process_v(pipe_control,
                                   std_inheritance,
                                   lsocks,
                                   binary_path,
                                   argv);
  while (argv_size > 0)
    GNUNET_free(argv[--argv_size]);
  GNUNET_free(argv);
  return proc;
}


/**
 * Retrieve the status of a process, waiting on it if dead.
 * Nonblocking version.
 *
 * @param proc process ID
 * @param type status type
 * @param code return code/signal number
 * @param options WNOHANG if non-blocking is desired
 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
 */
static int
process_status(struct GNUNET_OS_Process *proc,
               enum GNUNET_OS_ProcessStatusType *type,
               unsigned long *code,
               int options)
{
#ifndef MINGW
  int status;
  int ret;

  GNUNET_assert(0 != proc);
  ret = waitpid(proc->pid, &status, options);
  if (ret < 0)
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "waitpid");
      return GNUNET_SYSERR;
    }
  if (0 == ret)
    {
      *type = GNUNET_OS_PROCESS_RUNNING;
      *code = 0;
      return GNUNET_NO;
    }
  if (proc->pid != ret)
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "waitpid");
      return GNUNET_SYSERR;
    }
  if (WIFEXITED(status))
    {
      *type = GNUNET_OS_PROCESS_EXITED;
      *code = WEXITSTATUS(status);
    }
  else if (WIFSIGNALED(status))
    {
      *type = GNUNET_OS_PROCESS_SIGNALED;
      *code = WTERMSIG(status);
    }
  else if (WIFSTOPPED(status))
    {
      *type = GNUNET_OS_PROCESS_SIGNALED;
      *code = WSTOPSIG(status);
    }
#ifdef WIFCONTINUED
  else if (WIFCONTINUED(status))
    {
      *type = GNUNET_OS_PROCESS_RUNNING;
      *code = 0;
    }
#endif
  else
    {
      *type = GNUNET_OS_PROCESS_UNKNOWN;
      *code = 0;
    }
#else
#ifndef WNOHANG
#define WNOHANG 42 /* just a flag for W32, purely internal at this point */
#endif

  HANDLE h;
  DWORD c, error_code, ret;

  h = proc->handle;
  ret = proc->pid;
  if (h == NULL || ret == 0)
    {
      LOG(GNUNET_ERROR_TYPE_WARNING,
          "Invalid process information {%d, %08X}\n",
          ret,
          h);
      return GNUNET_SYSERR;
    }
  if (h == NULL)
    h = GetCurrentProcess();

  if (WNOHANG != options)
    {
      if (WAIT_OBJECT_0 != WaitForSingleObject(h, INFINITE))
        {
          SetErrnoFromWinError(GetLastError());
          return GNUNET_SYSERR;
        }
    }
  SetLastError(0);
  ret = GetExitCodeProcess(h, &c);
  error_code = GetLastError();
  if (ret == 0 || error_code != NO_ERROR)
    {
      SetErrnoFromWinError(error_code);
      LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "GetExitCodeProcess");
      return GNUNET_SYSERR;
    }
  if (STILL_ACTIVE == c)
    {
      *type = GNUNET_OS_PROCESS_RUNNING;
      *code = 0;
      return GNUNET_NO;
    }
  *type = GNUNET_OS_PROCESS_EXITED;
  *code = c;
#endif

  return GNUNET_OK;
}


/**
 * Retrieve the status of a process, waiting on it if dead.
 * Nonblocking version.
 *
 * @param proc process ID
 * @param type status type
 * @param code return code/signal number
 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
 */
int
GNUNET_OS_process_status(struct GNUNET_OS_Process *proc,
                         enum GNUNET_OS_ProcessStatusType *type,
                         unsigned long *code)
{
  return process_status(proc, type, code, WNOHANG);
}


/**
 * Retrieve the status of a process, waiting on it if dead.
 * Blocking version.
 *
 * @param proc pointer to process structure
 * @param type status type
 * @param code return code/signal number
 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
 */
int
GNUNET_OS_process_wait_status(struct GNUNET_OS_Process *proc,
                              enum GNUNET_OS_ProcessStatusType *type,
                              unsigned long *code)
{
  return process_status(proc, type, code, 0);
}


/**
 * Wait for a process to terminate. The return code is discarded.
 * You must not use #GNUNET_OS_process_status() on the same process
 * after calling this function!  This function is blocking and should
 * thus only be used if the child process is known to have terminated
 * or to terminate very soon.
 *
 * @param proc pointer to process structure
 * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
 */
int
GNUNET_OS_process_wait(struct GNUNET_OS_Process *proc)
{
#ifndef MINGW
  pid_t pid = proc->pid;
  pid_t ret;

  while ((pid != (ret = waitpid(pid, NULL, 0))) && (EINTR == errno))
    ;
  if (pid != ret)
    {
      LOG_STRERROR(GNUNET_ERROR_TYPE_WARNING, "waitpid");
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
#else
  HANDLE h;

  h = proc->handle;
  if (NULL == h)
    {
      LOG(GNUNET_ERROR_TYPE_WARNING,
          "Invalid process information {%d, %08X}\n",
          proc->pid,
          h);
      return GNUNET_SYSERR;
    }
  if (NULL == h)
    h = GetCurrentProcess();

  if (WAIT_OBJECT_0 != WaitForSingleObject(h, INFINITE))
    {
      SetErrnoFromWinError(GetLastError());
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
#endif
}


/**
 * Handle to a command.
 */
struct GNUNET_OS_CommandHandle {
  /**
   * Process handle.
   */
  struct GNUNET_OS_Process *eip;

  /**
   * Handle to the output pipe.
   */
  struct GNUNET_DISK_PipeHandle *opipe;

  /**
   * Read-end of output pipe.
   */
  const struct GNUNET_DISK_FileHandle *r;

  /**
   * Function to call on each line of output.
   */
  GNUNET_OS_LineProcessor proc;

  /**
   * Closure for @e proc.
   */
  void *proc_cls;

  /**
   * Buffer for the output.
   */
  char buf[1024];

  /**
   * Task reading from pipe.
   */
  struct GNUNET_SCHEDULER_Task *rtask;

  /**
   * When to time out.
   */
  struct GNUNET_TIME_Absolute timeout;

  /**
   * Current read offset in buf.
   */
  size_t off;
};


/**
 * Stop/kill a command.  Must ONLY be called either from
 * the callback after 'NULL' was passed for 'line' *OR*
 * from an independent task (not within the line processor).
 *
 * @param cmd handle to the process
 */
void
GNUNET_OS_command_stop(struct GNUNET_OS_CommandHandle *cmd)
{
  if (NULL != cmd->proc)
    {
      GNUNET_assert(NULL != cmd->rtask);
      GNUNET_SCHEDULER_cancel(cmd->rtask);
    }
  (void)GNUNET_OS_process_kill(cmd->eip, SIGKILL);
  GNUNET_break(GNUNET_OK == GNUNET_OS_process_wait(cmd->eip));
  GNUNET_OS_process_destroy(cmd->eip);
  GNUNET_DISK_pipe_close(cmd->opipe);
  GNUNET_free(cmd);
}


/**
 * Read from the process and call the line processor.
 *
 * @param cls the `struct GNUNET_OS_CommandHandle *`
 */
static void
cmd_read(void *cls)
{
  struct GNUNET_OS_CommandHandle *cmd = cls;
  const struct GNUNET_SCHEDULER_TaskContext *tc;
  GNUNET_OS_LineProcessor proc;
  char *end;
  ssize_t ret;

  cmd->rtask = NULL;
  tc = GNUNET_SCHEDULER_get_task_context();
  if (GNUNET_YES != GNUNET_NETWORK_fdset_handle_isset(tc->read_ready, cmd->r))
    {
      /* timeout */
      proc = cmd->proc;
      cmd->proc = NULL;
      proc(cmd->proc_cls, NULL);
      return;
    }
  ret = GNUNET_DISK_file_read(cmd->r,
                              &cmd->buf[cmd->off],
                              sizeof(cmd->buf) - cmd->off);
  if (ret <= 0)
    {
      if ((cmd->off > 0) && (cmd->off < sizeof(cmd->buf)))
        {
          cmd->buf[cmd->off] = '\0';
          cmd->proc(cmd->proc_cls, cmd->buf);
        }
      proc = cmd->proc;
      cmd->proc = NULL;
      proc(cmd->proc_cls, NULL);
      return;
    }
  end = memchr(&cmd->buf[cmd->off], '\n', ret);
  cmd->off += ret;
  while (NULL != end)
    {
      *end = '\0';
      cmd->proc(cmd->proc_cls, cmd->buf);
      memmove(cmd->buf, end + 1, cmd->off - (end + 1 - cmd->buf));
      cmd->off -= (end + 1 - cmd->buf);
      end = memchr(cmd->buf, '\n', cmd->off);
    }
  cmd->rtask =
    GNUNET_SCHEDULER_add_read_file(GNUNET_TIME_absolute_get_remaining(
                                     cmd->timeout),
                                   cmd->r,
                                   &cmd_read,
                                   cmd);
}


/**
 * Run the given command line and call the given function
 * for each line of the output.
 *
 * @param proc function to call for each line of the output
 * @param proc_cls closure for @a proc
 * @param timeout when to time out
 * @param binary command to run
 * @param ... arguments to command
 * @return NULL on error
 */
struct GNUNET_OS_CommandHandle *
GNUNET_OS_command_run(GNUNET_OS_LineProcessor proc,
                      void *proc_cls,
                      struct GNUNET_TIME_Relative timeout,
                      const char *binary,
                      ...)
{
  struct GNUNET_OS_CommandHandle *cmd;
  struct GNUNET_OS_Process *eip;
  struct GNUNET_DISK_PipeHandle *opipe;
  va_list ap;

  opipe = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_YES, GNUNET_NO, GNUNET_YES);
  if (NULL == opipe)
    return NULL;
  va_start(ap, binary);
  /* redirect stdout, don't inherit stderr/stdin */
  eip =
    GNUNET_OS_start_process_va(GNUNET_NO, 0, NULL, opipe, NULL, binary, ap);
  va_end(ap);
  if (NULL == eip)
    {
      GNUNET_DISK_pipe_close(opipe);
      return NULL;
    }
  GNUNET_DISK_pipe_close_end(opipe, GNUNET_DISK_PIPE_END_WRITE);
  cmd = GNUNET_new(struct GNUNET_OS_CommandHandle);
  cmd->timeout = GNUNET_TIME_relative_to_absolute(timeout);
  cmd->eip = eip;
  cmd->opipe = opipe;
  cmd->proc = proc;
  cmd->proc_cls = proc_cls;
  cmd->r = GNUNET_DISK_pipe_handle(opipe, GNUNET_DISK_PIPE_END_READ);
  cmd->rtask = GNUNET_SCHEDULER_add_read_file(timeout, cmd->r, &cmd_read, cmd);
  return cmd;
}


/* end of os_priority.c */