source: trunk/libs/newlib/src/newlib/libc/unix/getut.c @ 543

#ifndef _NO_GETUT

#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <utmp.h>
#include <_syslist.h>
#include <_ansi.h>

static int utmp_fd = -2;
static char *utmp_file = UTMP_FILE;

static struct utmp utmp_data;

void
setutent ()
{
  if (utmp_fd == -2)
    {
      utmp_fd = open (utmp_file, O_RDONLY);
    }
  lseek (utmp_fd, 0, SEEK_SET);
}

void
endutent ()
{
  close (utmp_fd);
  utmp_fd = -2;
}

void
utmpname (const char *file)
{
  utmp_file = strdup (file);
}

struct utmp *
getutent ()
{
  if (utmp_fd == -2)
    setutent ();
  if (read (utmp_fd, &utmp_data, sizeof (utmp_data)) < sizeof (utmp_data))
    return 0;
  return &utmp_data;
}

struct utmp *
getutid (struct utmp *id)
{
  while (read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data))
    {
      switch (id->ut_type)
        {
        case RUN_LVL:
        case BOOT_TIME:
        case OLD_TIME:
        case NEW_TIME:
          if (id->ut_type == utmp_data.ut_type)
            return &utmp_data;
        case INIT_PROCESS:
        case LOGIN_PROCESS:
        case USER_PROCESS:
        case DEAD_PROCESS:
          if (id->ut_id == utmp_data.ut_id)
            return &utmp_data;
        default:
          abort ();
        }
    }
  return 0;
}

struct utmp *
getutline (struct utmp *line)
{
  while (read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data))
    {
      if ((utmp_data.ut_type == LOGIN_PROCESS ||
           utmp_data.ut_type == USER_PROCESS) &&
          !strncmp (utmp_data.ut_line, line->ut_line,
                    sizeof (utmp_data.ut_line)))
        return &utmp_data;
    }

  return 0;
}

#endif /* !_NO_GETUT  */