115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <utmp.h>
|
|
|
|
|
|
/* For implementing this function we don't use the getutent_r function
|
|
because we can avoid the reposition on every new entry this way. */
|
|
int
|
|
getutid_r (const struct utmp *id, struct utmp **utmp,
|
|
struct utmp_data *utmp_data)
|
|
{
|
|
#if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)
|
|
/* Test whether ID has any of the legal types. */
|
|
if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
|
|
&& id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
|
|
&& id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
|
|
&& id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
|
|
/* No, using '<' and '>' for the test is not possible. */
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/* Open utmp file if not already done. */
|
|
if (utmp_data->ut_fd == -1)
|
|
{
|
|
setutent_r (utmp_data);
|
|
if (utmp_data->ut_fd == -1)
|
|
return -1;
|
|
}
|
|
|
|
/* Position file correctly. */
|
|
if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1)
|
|
return -1;
|
|
|
|
if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
|
|
|| id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
|
|
{
|
|
/* Search for next entry with type RUN_LVL, BOOT_TIME,
|
|
OLD_TIME, or NEW_TIME. */
|
|
|
|
while (1)
|
|
{
|
|
/* Read the next entry. */
|
|
if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
|
|
!= sizeof (struct utmp))
|
|
{
|
|
errno = ESRCH;
|
|
return -1;
|
|
}
|
|
|
|
/* Update position pointer. */
|
|
utmp_data->loc_utmp += sizeof (struct utmp);
|
|
|
|
if (id->ut_type == utmp_data->ubuf.ut_type)
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Search for the next entry with the specified ID and with type
|
|
INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
|
|
|
|
while (1)
|
|
{
|
|
/* Read the next entry. */
|
|
if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
|
|
!= sizeof (struct utmp))
|
|
{
|
|
errno = ESRCH;
|
|
return -1;
|
|
}
|
|
|
|
/* Update position pointer. */
|
|
utmp_data->loc_utmp += sizeof (struct utmp);
|
|
|
|
if (( utmp_data->ubuf.ut_type == INIT_PROCESS
|
|
|| utmp_data->ubuf.ut_type == LOGIN_PROCESS
|
|
|| utmp_data->ubuf.ut_type == USER_PROCESS
|
|
|| utmp_data->ubuf.ut_type == DEAD_PROCESS)
|
|
&& (strncmp (utmp_data->ubuf.ut_id, id->ut_id, sizeof id->ut_id)
|
|
== 0))
|
|
break;
|
|
}
|
|
}
|
|
|
|
*utmp = &utmp_data->ubuf;
|
|
|
|
return 0;
|
|
#else /* !_HAVE_UT_ID && !_HAVE_UT_TYPE */
|
|
errno = ENOSYS;
|
|
return -1;
|
|
#endif
|
|
}
|