newlib/libc/unix/getut.c

   1 #ifndef _NO_GETUT
   2
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7 #include <utmp.h>
   8 #include <_syslist.h>
   9 #include <_ansi.h>
  10
  11 static int utmp_fd = -2;
  12 static char *utmp_file = UTMP_FILE;
  13
  14 static struct utmp utmp_data;
  15
  16 void
  17 setutent ()
  18 {
  19   if (utmp_fd == -2)
  20     {
  21       utmp_fd = open (utmp_file, O_RDONLY);
  22     }
  23   lseek (utmp_fd, 0, SEEK_SET);
  24 }
  25
  26 void
  27 endutent ()
  28 {
  29   close (utmp_fd);
  30   utmp_fd = -2;
  31 }
  32
  33 void
  34 utmpname (const char *file)
  35 {
  36   utmp_file = strdup (file);
  37 }
  38
  39 struct utmp *
  40 getutent ()
  41 {
  42   if (utmp_fd == -2)
  43     setutent ();
  44   if (read (utmp_fd, &utmp_data, sizeof (utmp_data)) < sizeof (utmp_data))
  45     return 0;
  46   return &utmp_data;
  47 }
  48
  49 struct utmp *
  50 getutid (struct utmp *id)
  51 {
  52   while (read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data))
  53     {
  54       switch (id->ut_type)
  55         {
  56         case RUN_LVL:
  57         case BOOT_TIME:
  58         case OLD_TIME:
  59         case NEW_TIME:
  60           if (id->ut_type == utmp_data.ut_type)
  61             return &utmp_data;
  62         case INIT_PROCESS:
  63         case LOGIN_PROCESS:
  64         case USER_PROCESS:
  65         case DEAD_PROCESS:
  66           if (!strncmp (id->ut_id, utmp_data.ut_id, sizeof (utmp_data.ut_id)))
  67             return &utmp_data;
  68           break;
  69         default:
  70           abort ();
  71         }
  72     }
  73   return 0;
  74 }
  75
  76 struct utmp *
  77 getutline (struct utmp *line)
  78 {
  79   while (read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data))
  80     {
  81       if ((utmp_data.ut_type == LOGIN_PROCESS ||
  82            utmp_data.ut_type == USER_PROCESS) &&
  83           !strncmp (utmp_data.ut_line, line->ut_line,
  84                     sizeof (utmp_data.ut_line)))
  85         return &utmp_data;
  86     }
  87
  88   return 0;
  89 }
  90
  91 #endif /* !_NO_GETUT  */