util.c: Revert workaround eeefcdff, 6eb56e72 and e3787e86

#define EINVAL  22 /* errno.h value */

#endif

#ifdef __MINGW32__

#include <TlHelp32.h>

#endif

#if defined(ENABLE_IPV6) && defined(__MINGW32__)

const struct in6_addr in6addr_any = {{ IN6ADDR_ANY_INIT }};

#endif

  return r;

}

#ifdef __MINGW32__

/* WORKAROUND

 *

 * These functions make it possible to get the Msys PID instead of the

 * Windows PID assigned to the current process. This is done by walking up

 * to the Msys sh.exe process that launched the actual Windows processes.

 *

 * Usually an Msys process would result in the following process tree:

 *   sh.exe           <-- waiting Windows process, but visible Msys process

 *     \

 *     <proc>.exe     <-- waiting Windows process, but not visible to Msys

 *       \

 *       <proc>.exe   <-- running Windows process, but not visible to Msys

 *

 * Attention: This may not be true for all Msys processes.

 */

static pid_t getpid_msys(void)

{

  PROCESSENTRY32 entry;

  HANDLE snapshot;

  DWORD pid;

  BOOL walk;

  pid = (DWORD)getpid();

  entry.dwSize = sizeof(PROCESSENTRY32);

  snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, pid);

  if(snapshot != INVALID_HANDLE_VALUE) {

    walk = TRUE;

    do {

      if(Process32First(snapshot, &entry)) {

        do {

          if(pid == entry.th32ProcessID) {

            if(!strcmp(entry.szExeFile, "sh.exe")) {

              walk = FALSE;

              break;

            }

            pid = entry.th32ParentProcessID;

            break;

          }

        } while (Process32Next(snapshot, &entry));

      }

    } while(walk);

    CloseHandle(snapshot);

  }

  return (pid_t)pid;

}

#define getpid() getpid_msys()

#endif

int write_pidfile(const char *filename)

{

  FILE *pidfile;