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/* 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
}
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