92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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/* For implementing this function we don't use the getutent_r function
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because we can avoid the reposition on every new entry this way. */
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int
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getutid_r (const struct utmp *id, struct utmp **utmp,
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struct utmp_data *utmp_data)
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{
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#if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)
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/* Test whether ID has any of the legal types. */
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if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
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&& id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
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&& id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
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&& id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
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/* No, using '<' and '>' for the test is not possible. */
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{
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errno = EINVAL;
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return -1;
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}
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/* Open utmp file if not already done. */
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if (utmp_data->ut_fd == -1)
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{
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setutent_r (utmp_data);
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if (utmp_data->ut_fd == -1)
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return -1;
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}
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/* Position file correctly. */
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if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1)
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return -1;
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while (1)
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{
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/* Read the next entry. */
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if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
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!= sizeof (struct utmp))
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{
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errno = ESRCH;
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return -1;
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}
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/* Update position pointer. */
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utmp_data->loc_utmp += sizeof (struct utmp);
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if ((id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
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|| id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
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&& id->ut_type != utmp_data->ubuf.ut_type)
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/* Stop at the next entry with type RUN_LVL, BOOT_TIME,
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OLD_TIME, or NEW_TIME. */
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break;
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if ((id->ut_type == INIT_PROCESS || id->ut_type == LOGIN_PROCESS
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|| id->ut_type == USER_PROCESS || id->ut_type == DEAD_PROCESS)
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&& strncmp (id->ut_id, utmp_data->ubuf.ut_id, sizeof id->ut_id) == 0)
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/* Stop at the next entry with the specified ID and with type
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INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
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break;
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}
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*utmp = &utmp_data->ubuf;
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return 0;
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#else /* !_HAVE_UT_ID && !_HAVE_UT_TYPE */
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errno = ENOSYS;
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return -1;
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#endif
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}
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